Sierra & Cheyenne

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Power Won’t turn on; no standby light

  1. No power to system; check AC power.
  2. Main breaker popped out, press to reset.
  3. Check voltage to main breaker.

Will not turn on; standby light on

  1. Press power button on front panel.
  2. Low AC power, check AC voltage.
  3. E-Prom defective, inserted backward, or not seated properly. Check to make sure it’s installed and seated properly or replace with new one. If E-Prom has been installed backward, it will most likely need to be replaced.
  4. Low 5 Volt supply check the unregulated 5 Volt supply.
  5. Possible RAM chip failure. Replace.

Unit will not turn on; no standby light

  1. No power to system; check AC.
  2. Main breaker popped out, press to reset.
  3. Check voltage to main breaker.

Receiver locks up

  1. Unplug and plug in to reset.
  2. Check to ensure that a grounded outlet is used.
  3. Check lithium battery level.
  4. Make sure jumper near battery is in place on Sierra II.

Unit turns off by itself

  1. Low AC line voltage causing receiver to go into “brown out” condition. Check AC power. D112 may need to be changed to a 7V zener diode to lower brown out voltage on the receiver. With a 7V zener installed, the receiver should go into Standby at approximately 95 VAC.
  2. If using Remote Eye circuit, unit may be getting excessive noise from the coax line. Make sure all possible noise sources are isolated.

Turns off when changing channel/satellite

  1. Disconnect Polarotor motor wires and try to duplicate problem. If normal operation resumes, reconnect Polarotor wires to receiver, but move the ground wire to a different ground terminal on the back of the receiver. Test again.
  2. If above test is conclusive showing a bad ground terminal, a cold solder joint on the ground terminal is most likely the cause of the problem. Resolder ground terminal connector to circuit board.

Receiver shuts off as soon as actuator is engaged

  1. AC voltage is low. Check AC outlet with VOM.
  2. Bridge rectifier PCA may have cold solder connections. Resolder all connections PS PCA or Bridge Rectifier PCA.

Fan runs constantly, even when in Standby

This is normal due to the fact that the power supply is fully functional even when in Standby mode. The receiver provides power to the VCII module and IF section of the receiver allowing the VCII to be updated with new authorization information.

Fan is noisy

The cooling fan can be slowed down by installing one or two 1N4001 diodes in series on the red lead, with the silver band towards the fan.

Fan will not start

  1. Diodes(s) installed backward.
  2. Defective fan. Replace.
  3. Test for correct voltage at the fan, 9-10 VDC.

Actuator Actuator breaker trips

  1. Check to insure that actuator tube isn’t binding at the dish.
  2. Remove motor from tube to insure that it is easy to move the tube manually with a screwdriver or hand crank.
  3. Reset breaker, disconnect one of the motor wires and insert a VOM between the receiver and motor wire. VOM must be set to the 10 amp scale to determine current draw. Normal amperage should be between 1.5 to 2.5 amps DC. At approximately 5-7 amp draw, the receiver’s circuit breaker will trip. Look for water damage in the motor or defective motor end cap with a loose retainer clip.

Dish does not return to the same position each time a satellite is selected

  1. Loose mechanical connection between the actuator and mount. Tighten mount and actuator hardware.
  2. Sensor wires loose. Check and tighten.
  3. Magnet wheel loose. Tighten or replace.
  4. Sensor positioned too far from magnet wheel. Move sensor to within 1mm of magnets.
  5. Defective sensor. Replace sensor.
  6. Dish has been moved off track. Enter Advanced Function 74, realign dish, to re-program dish position.
  7. Water in actuator. Clean and re-seal actuator tube and motor housing. Redrill drain holes in proper places.
  8. Determine if receiver returns dish to same memorized satellite position number. If it does, it is very likely that the receiver is working properly and that it is being given improper counting information by the actuator counting circuit.
  9. Determine if the dish is falling short when moving between two assigned satellites or going past the desired position. Example: Satellite G1 is known to be at a position of 5000, F4 at a position of 4700. As you move from F4 to G1, the dish position shows 5000, but it is necessary to move the dish to (i.e.) 5005 to actually be on G1. This is evidence that it fell short of G1 and that stray (extra) counts are being picked up, possibly radiated into the actuator sensor or cabling. Foil shielded cable with an electrical drain wire connected to ground will be necessary to solve this problem. As you move from F4 to G1, the dish position shows 5000, but it is necessary to move the dish to 4995 to actually be on G1. This is evidence that it went past G1 and that the sensor is dropping counts. Refer to TB 87-8 to check positioning of the sensor or an improperly polarized, or broken magnet wheel.
  10. Some actuators do not produce clean pulses or well defined counts which will look like a single count instead of two separate ones. This is symptomatic of a “dropped” count and will cause the second scenario. Replace actuator with different brand.
  11. Add a .01uf 50v cap. between the two motor leads on the actuator motor.

Stops on satellites correctly when moving one direction, but is always off a few numbers when moving in the other direction

  1. End-play in actuator tube, check for excessive play. Replace tube or actuator if necessary.
  2. Slop in mount, adjust as necessary.

Dish takes off on its own and goes past memorized limits to the mechanical limit of the actuator

  1. “Dish Runaway” is caused by transients on the data bus. Electrical noise can be introduced through the actuator and Polarotor cables. This can be eliminated by installing CPU Modifications for Cheyenne IR/D listed in TB 88-12, or CPU Modifications for Sierra III listed in TB 88-13, or refer to TB 88-11.
  2. Confirm the AC outlet is properly grounded and polarized before re-installing.

When trying to move dish, dish moves a short distance then stops and starts again causing a jogging effect

  1. Remote eye switch is ON without a remote eye or ranger being connected. Turn remote eye switch off.
  2. If using a ranger, actuator motor noise is interfering with the ranger module. Move module away from motor wires or turn remote eye switch off during programming of satellites into memory. Once all satellites are stored, return remote eye switch to ON position.
  3. Cheyenne IR/D’s in particular will jog and stop in the dish mode when the remote eye switch is turned ON. Turn the remote eye switch to the OFF position until all satellites are stored into memory then return the remote eye switch to the ON position.

Dish moves short distance, stops, and jack error message is displayed on TV screen

  1. Sensor wire(s) broken or not connected. Check and reconnect actuator sensor wires.
  2. Magnet wheel loose or broken. Replace magnet wheel.
  3. Defective sensor. Replace sensor.
  4. Mount or actuator binding. Check and correct mount hardware.
  5. Mechanical Actuator limits reached. Set dish limit before Jack Error is displayed.
  6. Refer to TB 87-8 “Servicing the Actuator Sensor and Magnet Wheel.”
  7. To test receiver sensor circuit, you can false a count to the receiver. Remove actuator sensor wire with one end inserted into the sensor terminal and with the receiver in Dish Mode, quickly tap the other end of the wire repeatedly against a grounding point (i.e., F-connector) while moving the dish East or West. If the receiver displays an ascending or descending count, the actuator sensor circuit is working properly and the problem will be in either the sensor cable or actuator sensor device on the actuator arm. Confirm the dish moves as well. If not, test the motor wires or the actuator motor itself.

Dish does not move

  1. Advanced Function 34, dish lock, is in locked mode. Enter Advanced Functions and unlock dish.
  2. Actuator Breaker CIRD: (B12), or S-III: (B-10) is popped out. Push in to reset.
  3. Poor connections. Check and correct mount hardware.
  4. Mount or actuator binding. Check and correct mount hardware.
  5. Actuator frozen. After thawing, remove water from actuator tube and motor housing.
  6. Actuator fully extended or retracted and mechanically locked up. Remove motor and move tube off limits manually using a small wrench or screwdriver.
  7. Check CN105 (3 conductor red wire loom) to make sure it is seated properly.

Picture\Video Upper channels are fine, but lower channels have a lot of snow (Ku-Band will be the reverse of this)

  1. Bad LNB, replace.
  2. Bad IF loop cable, replace.
  3. Bad 1 GHz cable. Make sure you are using 950-1450 sweep-tested RG-6 cable. If water has gotten into the cable, the lower frequency will pass OK, but the high frequency will be severely attenuated. Replace cable.
  4. Cable run is too long. Install line amplifiers at mid-point(s) between receiver and LNB.
  5. Swap C and Ku-Band 1 GHz cable to verify condition of cable.

Picture full of sparkles

  1. Dish aimed incorrectly. Check and correct dish position.
  2. Feed positioned incorrectly. Check and correct feed position (see the feedhorn instruction manual).
  3. Polarity tuning incorrect. Press AutoTune and/or adjust manually. See Polarity section.
  4. Transponder frequency incorrect. Fine-tune video to match transponder frequency. Press store.
  5. Poor connections. Check all coaxial cables for breaks, corrosion, loose fittings.
  6. Signal strength too high. Turn down IF Gain CIRD: (B6), S-III: (B4). Install DC passive attenuator in the 1 GHz IF input. Adjust signal strength so that 8 out of 10 segments are lit on front panel signal strength.
  7. Signal strength too low. Turn up IF Gain on rear of receiver. Excessive signal loss between LNB and receiver. Substitute existing coax cable with RG-6 950-1450 MHz sweep-tested coax cable to determine if cable is damaged or defective. If the cable run is in excess of 200 ft., a larger coax cable (i.e. RG-11), and or a 950-1450 MHz line amplifier(s) may be necessary.
  8. Bad 70 MHz loop cable. Replace.
  9. Bad V/H or 4/12 switch, connect LNB cable directly to 1 GHz 18V input.

Light sparkles to complete loss of picture on some or all satellites; occurs for several hours during spring and fall

Solar eclipse of the satellite currently viewed. Move dish to a different satellite. Avoid eclipse condition.

Light sparkles to complete loss of picture on some or all channels and satellite. This condition may worsen periodically

Terrestrial Microwave Interference (TI). Sierra III: Enter AF 68 and turn on one or both filters. Enter AF 66 and select the IF bandwidth which produces the best picture. Enter video mode and fine-tune the video frequency to improve the picture. A 70 MHz loop is provided on both the Cheyenne IR/D and the Sierra III receivers for the use of external TI or bandwidth filtering if necessary. The intensity of the interference may vary from time to time requiring modification of AF66 and AF68.

Picture rolls across screen

  1. Signal coming into receiver is too weak. Turn up IF Gain. On very weak satellites the sync generator will have to be turned off using AF 52.
  2. Verify you are not on a scrambled channel that doesn’t work with the internal descrambler module (i.e. Oak/Orion Decoder).
  3. Possible descrambler module failure, see descrambler troubleshooting section.
  4. Polarity set incorrectly, press AutoTune or adjust polarity using polarity mode.

No video, audio, snowy screen, has graphics

  1. TV set and receiver are not tuned to the same VHF channel. Check TV channel selector and VHF Mode Switch CIRD: (B13), S-III: (B15). Set both to either channels 3 or 4.
  2. Dish not aimed at any satellite. Check polar mount for correct tracking of the Clarke Belt.
  3. Bad cable connection. Check all coaxial cables and connectors for breaks, corrosion, loose fittings. The center conductor of all coaxial cables should be at least 1/8″ past the end of the connector.
  4. Broken or damaged 70 MHz Loop, CIRD: (B1), S-III: (B11). Replace.
  5. Reset LNA breaker.
  6. Check for voltage to LNB on 1 GHz input, 18 VDC + 2 VDC is normal.
  7. Connect LNB directly to 1 GHz 18V input bypassing any V/H or 4/12 switches and splitters.
  8. Test with known working LNB. Replace if defective.
  9. Damaged IF gain pot, check to make sure it isn’t shorted to the main board.

No video or audio, gray screen, no on screen graphics

  1. See solutions listed above.
  2. Check display positioning AF45. Turn the display back on.
  3. Enter advanced functions. If the menu appears, master clear (AF 94, Satellite, Store).

No video or audio, gray or black screen, signal strength present, has on screen graphics

Check IC353. Heatsink may be shorting out an adjacent component. Video may come back as soon as cover is removed. Adjust position or insulate IC353 so it no longer shorts out.

No video, sound O.K.

  1. No video on current channel. Change channel.
  2. Poor video monitor connections. Check and replace cables.
  3. No power to video monitor. Check voltage to monitor.
  4. Modulator defective. Connect video output to an external modulator.

No graphics/display

  1. Press and hold the “9” key to bring graphics up on a full black sync background.
  2. If Step 1 displays graphics, check AF 52 to see if sync is turned OFF. Turn sync ON.
  3. The display may be turned OFF in AF 45. Turn the display back ON.

No video unless a satellite with inverted polarity format is called up on the receiver

  1. V/H inputs are reversed. Swap the vertical input with the horizontal input on the V/H switch.
  2. If one receiver among several others is the only one doing this, do a master clear procedure. After doing the master clear, the factory loaded database will automatically be present in memory, therefore assigning proper polarities on each satellite.

Several channels have same picture

  1. Move to another satellite and verify problem.
  2. If the problem goes away, several channels may be carrying the same feed or the database for that satellite is bad. Erase satellite from memory and then restore.
  3. If the problem is on other satellites as well, the database has been corrupted and a master clear procedure is necessary, (TB 88-3).

All channels need to be tuned the same amount for good pictures

  1. LNB is off frequency. Use AF 75 to shift video frequency on all channels.
  2. LNB is defective. Replace.

Buzz in audio whenever graphics appear on the screen

  1. Adjust VR234 CCW to lower video level. Lower the video enough to solve the buzz in the TV’s audio.
  2. CIRD Only: If Advanced Functions graphics are torn as well, parallel a 2.2 K ohm resistor across R319 or replace with a 1 K ohm resistor.

TV screen message flickers

  1. Low signal level on the channel being viewed. Fine-tune the video frequency to improve reception or select a stronger channel.
  2. Press and hold the “9” button on the remote control to manually override the video with the display.
  3. If gain set too low, turn up IF gain.

Graphics are shifted to the right and/or partially off the screen

Defective component in Sync Generator circuit, board level repair is required.

Graphics are unreadable, look similar to telephones or pacman

Defective Sync Generator (IC817,MB88303); board level repair is required.

CIR/D ONLY, graphics smeared/torn diagonally

Sync level is too high for the TV being used. Parallel a 2.2 K Ohm resistor with R 319 on main board or replace with a 1 K Ohm resistor. Refer to diagram of board layout #B for location of R319.

Small, wavy lines in video

NOTE: Herringbone and co-channel interference is covered under signal distribution.

  1. Verify this condition by unplugging the receiver from its power source for 1 hour. Reconnect and turn on the receiver. If horizontal lines begin to appear in approximately 15-30 minutes, see TB 88-16, “Sierra III and Cheyenne IR/D Voltage Regulator Heatsink Modification.”
  2. On Cheyenne IR/D, check for grounding strap on left rear corner on the main PC board.
  3. Check voltage on T1 and T2. If voltage is not present, one or more of the following components has been damaged: R505, IC503, or IC504. To disable the circuit, clip and lift one end of R505. If a UHF antenna module is being used on the system, the circuit will need to be repaired or a separate 9VDC adapter can be used to provide power to the module.

Large horizontal lines appear in video when using a V/H or 4/12 switch and large black bars roll through the picture but disappear when the wire is removed from the V/H or 4/12 terminal

Add a 1N4001 diode in series with the voltage lead going to the switch. Install the banded end toward the switch. This allows the V/H or 4/12 switch to fully disengage.

AutoTune does not work on a scrambled channel

This is normal, AutoTune will only work on nonscrambled channels.

Auto Tune seeks polarity and dish position, but never stops at an optimum location

  1. Signal strength is too high or too low.
  2. Adjust IF gain so that 8 out of 10 segments light up on the front panel bar graph when viewing an average to strong non-scrambled channel.

Signal strength meter always pegged; AutoTune does not work; large black sparkles in picture; short cable from LNB to input

  1. IF gain too high. Adjust IG gain to best picture with 8 out of 10 segments lit on meter. If meter remains pegged after IF gain adjustment, insert a 10 db DC passive attenuator in the 1 GHz IF input.
  2. Downconverter attached directly to the LNA. Place 10-15′ of RG-213 cable between LNA and downconverter to attenuate the signal.

Main Replacement Parts–Sierra

Most likely components that cause rolling video on non-subscription channels and VCII channels to have static or VCII module not to engage.

  • Replace digital cables between digital main PCB
  • Replace the following capacitors in the video circuit:
    C154, C156, C158, C166, C167, C171, C161, C172
    replace C162 reverse(+ side toward jct. TR111-R169)
  • Detector circuit: C314 (C315, C305 also possible)
  • Power Supply: C701, C702
  • TR205, C205 on main board
  • C321 (+5v out to pol.)

Sierra II main replacement parts list

Most likely components that cause rolling video on non-subscription channels and VCII channels to have static or VCII module not to engage.

  • C154 100uF 25Volt
  • C156 100uF “
  • C166 22uF “
  • C167 22uF “
  • C171 47uF “
  • C102 100uF “
  • C181 22uF “
  • C183 47uF “
  • C187 47uF “
  • C191 22uF “
  • C192 22uF “
  • C314 10uF “

Main Replacement Parts–Cheyenne IR/D

Most likely components that cause rolling video on non-subscription channels and VCII channels to have static or VCII module not to engage.

  • Replace the following capacitors for VCII problems:
    C213, 4,400 pF or (2 – 2200 pF in parallel); C279, 33 uF @ 25v; C366 C237, 100 uF @ 25v; C244, 1000uF @ 10v
  • Replace the following capacitors for non-VCII channel problems:
    C217, C219 C366, 100 uF @ 25v; C224 C247, 22 uF @ 25v.

Main Replacement Parts–Sierra III

Most likely components that cause rolling video on non-subscription channels and VCII channels to have static or VCII module not to engage.

  • Replace the following capacitors for VCII problems:
    C213 C286, 2200 pF; C221, 33 uF @ 25v; C366 C237, 100 uF @ 25v; C244, 1000uF @ 10v; C279, 100pF @ 25v.
  • Replace the following capacitors for non-VCII channel problems:
    C217, C219 C366, 100 uF @ 25v; C224 C247, 22 uF @ 25v.

Audio No audio on VCII channels

WARNING: Unplug receiver before removing VCII module.

  1. Check and clean connections on VCII Module and edge card connector in receiver. Pencil eraser, Q-Tips, and alcohol can be used.
  2. Substitute a known working VCII module to confirm the source of problem.
  3. If audio is low, adjust VR451, right VCII audio level, and VR449 left VCII audio level.
  4. Check Set-up 0 in the VideoCipher diagnostics for no or slow rollover count. See Descrambler section.

No audio on all channels

  1. Volume turned down. Check the receiver, TV, and/or audio amplifier volume controls and power sources.
  2. Audio frequency incorrect. Check audio frequency display with program guide. Place receiver in audio mode and retune audio frequency.
  3. Poor audio connections. Check cables to audio amplifier or VCR.
  4. Modulator defective. Connect Audio Output CIRD: (B4), or S-III: (B-13) to an audio amplifier or VCR.

Noisy audio on VCII channels

  1. Baseband level too high or low. Adjust VR255 for best rollover rate in Set-up 0, line 2, column 3. If no result, adjust VC362 in conjunction with VR255.
  2. Substitute module with known working unit.

Noisy audio on normal channels

  1. The audio frequency is not tuned correctly. Set tuning mode to audio and retune audio frequency.
  2. Audio Bandwidth incorrect. Select correct bandwidth.
  3. Audio Mode incorrect. Select the best sounding Audio Mode. See Audio Tuning section of the installation and operation manual.

Low audio on clear channels, scrambled channels OK

  1. Check Steps 1 through 5 above. (AUD.NO)
  2. Cheyenne IR/D Only: Adjust normal channel audio with VR 486.

Buzz in Audio

  1. Confirm all components are plugged into same AC source that is properly grounded and polarized.
  2. Test for voltage between chassis to TV, VCR, audio amp, satellite receiver, etc., with all patch cords disconnected between components to determine if there is a difference of ground potential.
  3. Reconnect all RF video and audio cables one at a time until buzz is reintroduced. At that point, insert matching transformers in the cable(s) that cause the buzz. This creates isolation between the chassis of components. Creating grounding by a separate jumper wire from chassis to chassis may also solve the buzz by equalizing the grounding between components.
  4. Audio lines can be isolated by inserting 1:1 audio isolation transformers (600-900 ohn impedance) in the line.

Low audio on clear channels, scrambled channels OK

  1. Volume turned down. Check the receiver, TV, and/or audio amplifier volume controls and power sources.
  2. Audio frequency incorrect. Check audio frequency display with program guide. Place receiver in audio mode and retune audio frequency.
  3. Poor audio connections. Check cables to audio amplifier or VCR.
  4. Modulator defective. Connect Audio Output CIRD: (B4), or S-III: (B-13) to an audio amplifier or VCR.
  5. Cheyenne IR/D Only: Adjust normal channel audio with VR 486.

Audio buzzes only when there is sound in the audio

CN1201 at the top of the card connector board, the right channel audio pin is soldered to ground. This problem occurred only on VCII+.

Solution: Make sure that none of the pins on the back of the card connector are shorted to any of the adjacent pins.

Low or unbalanced VCII audio

  1. Adjust VR449 (VCII left channel) to equalize with normal channel level.
  2. Adjust VR451 (VCII right channel) to equalize with normal channel level and VCII left channel.

Audio volume varies from channel to channel

Broadcast audio volume varies on each satellite service. This is normal. Turn up volume on TV or amplifier, and adjust receiver volume with remote control.

Polarity Only getting odd or even channels

  1. Both polarities set at same value. Place receiver in the polarity mode and adjust until picture comes in then store new value. Both polarities may need to be fine tuned.
  2. Check AF 73 Select Feed Type for proper selection.
  3. Bad polarity output on receiver. Check with good servo connected directly behind receiver.
  4. Check voltages going to servo (see voltage section).
  5. Check wire going to Polarotor for any breaks or shorts.
  6. Bad servo motor, replace with new unit.

Receiver will not change polarity, stays on one polarity all the time

  1. Refer to V/H and 4/12 Switching section.
  2. Note: Main/remote switch must be in the MAIN position in order to alter polarity values in the polarity mode. Return the switch to REMOTE position after altering polarity values on all slave receivers.
  3. Check all wire connections from V/H and 4/12 switches to V/H and 4/12 terminals on back of the receiver.
  4. Sierra III Only: Check AF 78 for correct IF switching.

Polarity keeps changing or drifting while watching TV

  1. Voltage pulses are being radiated/injected into Polarotor wire. Use 3 conductor shielded cable and connect the drain wire to a ground rod at the dish and to a ground terminal on the back of the receiver.
  2. Bad servo motor, replace.
  3. Connect a separate servo motor directly to receiver and mark position of probe for each polarity. When you see the polarity change, check to see if the test servo moves also.
  4. Disconnect pulse wire from back of receiver. If servo still moves, voltage impulses are being injected.
  5. Shield servo with foil and connect to drain wire on Polarotor cable.
  6. Test Procedure: Move polarity value either up or down by 2-3 numbers to update pulse information. If picture returns, note procedures in points 1 and 5. If a shielded cable is not available, but an extra unused coax is, use the center conductor of the coax for pulse and connect the coax shield to ground to drain off any radiated voltages.

Polarity drifts every time the actuator is moved

  1. See Steps 1 through 6 above.
  2. Actuator voltage is causing servo to move. Run separate shielded cable for Polarotor, moving it a distance from the actuator cable if possible.

Faint interference in video pulsating every 15 seconds

NOTE: The Polarotor pulse output is updated approximately every 15 seconds.

  1. If the Polarotor cable is unshielded or the shield is not connected to a good earth ground, the pulse is probably radiating into the 1 GHz line or V/H switch control wire. If a V/H or 4/12 switch is hooked up down line from the receiver, the voltage toggle wire may be picking up some radiated voltage and keeping the switch from toggling to O VDC.
  2. Disconnect the pulse wire from the back of the receiver. If problem goes away, begin troubleshooting the cable. Connect pulse lead to receiver to duplicate problem. Disconnect the V/H or 4/12 toggle wire at the receiver to see if the problem goes away. Then disconnect the wire at the switch. If this solves the problem, voltage is being radiated into the voltage toggle wire. This can be filtered by installing a .05 uF capacitor between the ground and voltage terminals on the switch.
  3. If problem persists, substitute 1 GHz input with another cable that has good shielding to see if problem goes away. The 1 GHz cable may have a break in the shield or be damaged in some other way.
  4. The overall principle in troubleshooting this kind of problem is to reduce the installation down to a 1 GHz cable, by-pass all switches and other devices, but still allow video to be present on the TV. Then reconnect each cable until problem is reintroduced, allowing you the ability to identify the source of the problem.

Picture is gone after AutoTune is used

  1. AF73 must be in “Using Dual Feed” once receiver has been programmed if using a dual feed.
  2. Turn polarity tune OFF using AF76.
  3. IF gain too high or low, see Video section.
  4. Use AutoTune only on non-scrambled channels. AutoTune will not work on a scrambled channel.
  5. If Terrestrial Microwave Interference is present, AutoTune may not work accurately.

Cross Pole in picture

NOTE: Polarity value numbers should be between 100 and 125 on horizontal channels, and between 175 and 200 on vertical channels. If not, readjust feedhorn using polar axis arrow and/or replace servo motor.

  1. Make sure polarity changes while in polarity mode.
  2. Feedhorn improperly aligned. Use Polar Axis Arrow to realign feed.
  3. Polarity incorrect. Press AutoTune in Polarity Mode.
  4. Satellite named incorrectly. Select dish tuning mode. Move dish to satellite matching current satellite name and press store.
  5. Poor cables between receiver and TV set, replace.

V/H Switch isn’t passing appropriate polarity

  1. Swap vertical and horizontal coax cables on V/H switch to determine if they are installed backwards.
  2. Connect coax from LNBs directly to 1 GHz input. If picture is present, confirm 18VDC is present on LNB side of switch and proceed to step 3. If no picture, refer to video troubleshooting.
  3. S-III Only: Check AF78 for correct IF switching.
  4. Proper polarity value is not stored in memory. Select “Using Polarotor” in AF73. Even polarity values in the polarity mode correspond to vertical polarity and +15VDC on the V/H terminal. Odd polarity values in the polarity mode correspond to horizontal polarity and OVDC on the V/H terminal. Once proper switching is achieved, press the STORE button. Once proper operation is achieved on all satellites, move AF73 to “Using Dual Feed.”

Switch isn’t toggling to Ku-Band

  1. Confirm C-Band and Ku-Band are live by bypassing switch and going directly into 1 GHz input on receiver.
  2. Confirm toggle voltage on 4/12 terminal and at 4/12 switch, C-Band = OVDC, Ku-Band = +15VDC.
  3. If no voltage on Ku-Band, check AF53 to confirm that a Ku-Band format has been selected. Note: Satellite must be erased (AF54) if format is to be changed.
  4. S-III only: Check AF78 for correct IF switching.

Messages, Procedures Miscellaneous “Satellite Not Found” is displayed

  1. Satellite not in memory of both receivers.
  2. Check all receivers for duplicate satellite memory.

The East and West limits are both set at the same location

  1. The actuator sensor wires are connected improperly. Reconnect the actuator wires correctly, master clear the receiver and reset the limits, see TB 88-3.
  2. Confirm that the down tuning button drives the dish toward the east limit, and the up tuning button drives the dish toward the West limit.
  3. Reprogram the system.

Clock not working, displays on TV screen occasionally

Microprocessor and clock are not synchronized. Change Sierra III software to Rev. 7 or higher.

Clock runs fast or slow

Clock frequency is off; needs to be reset at factory. Bench level repair is necessary.

Receiver displays “Cannot change format” when using AF53

A satellite that is preprogrammed in memory must first be erased if the format is to be changed. Once the STORE button is pushed when a new satellite designation is programmed into memory, the satellite must be erased (AF54) if the format is to be changed.

Sierra III: Advance function menu graphics have horizontal jitter that rolls from top to bottom of screen

See TB 88-15.

Sierra– High pitched whine in audio all of the time

  • Need to check oscillator with a freq. counter at R408(resistor w\only one side soldered)
  • If subcarrier is: 5.0 freq. is 15.7MHz, 6.8………..17.5MHz., 8.5………..19.2MHz
  • If freq. does not change when tuning audio subcarrier, IC 402 may be bad. You will need to check PLL circuit.

Sierra, remote range is very short, and\or segments on fpd are always lit, wrong commands, receiver locks up

Could be bad digital cables, remove glue replace. Limited range on remote can also be caused from caps. drying out around IC817. Replace C817, C823, C825, C827.

Password for receiver is lost or forgotten, Advanced Functions are locked out

  1. Access the AF in the normal way. When the password is requested, alternately press SAT and STORE five times. This will let you into AF.
  2. Change the password using AF42.

AF 67, video level Sierra III no change from Level 2 to 3

See TB 88-17, jumper wire needs to be installed between the emitter of Q001 to the emitter of Q221. Then readjust video level VR234 to level 2 on a non-scrambled channel.

AutoTune key displays “Favorite Channel” on a CIR/D

  1. AF84 allows the AutoTune key to be used as favorite channel access in E-Prom revisions 11 and above.
  2. If the AutoTune function is desired, it can be enabled using AF84.

Time (Sierra III only) — The receiver does not select the satellite and channel at the scheduled event time

  1. Clock is not set properly. Reset time using AF22. Confirm that the AM/PM and 24 Hour clock settings are correct.
  2. Another timer event was occurring at the same time. Check for previously scheduled events which may conflict with a new event that you are programming.
  3. Timer functions disabled. Enable timers using Advanced Function 27.
  4. Power was removed from the system at the time the event was scheduled to occur. Check plugs, outlets, and building electrical circuit for intermittent operation.

Timer (Sierra II only) — When attempting to set a timed event, it just doesn’t accept it; an event that was scheduled, ran 24 hours too soon or too late; or the date changes when you save the event

A problem has been identified in the leap year logic in these receivers. During February of each leap year, all events scheduled will run 24 hours before they are supposed to. After February, all events scheduled will run 24 hours after they are supposed to.

Solution: Use AF22 (Set Time & Date) to set the year back to 1990. Then, after March 1, 1996, change the date to 1991 on Sierra II receivers and to 1996 on Sierra III receivers. This should keep you going until the year 2000 when leap year returns again.

Multi-receiver Slave displays: “Master no response”

  1. Bad data cable or data cable is too long. Cable should be no longer than 3-6 feet.
  2. Confirm cable is color for color when you face modular connections head to head, as if creating an inline splice.
  3. Data cable must be connected from the output of the master to the input on slave #1, and from the output of slave #1 to the input of slave #2 and so on.

Some advanced functions come up “Not Available”

  1. Receiver may be configured as a slave receiver due to the main/remote switch being put in the REMOTE position.
  2. The advanced function that was requested may only be available on slave receivers when the main/remote
  3. switch is in the REMOTE position. Check the owner’s manual for details on the purpose of the various Advanced Functions.

Dish will not move, jumps from volume mode directly to video frequency mode (skips dish mode)

  1. Main/remote switch is in the REMOTE mode. Move to MAIN position and turn off receiver to reset circuit.
  2. Main/remote switch is making poor contact. Slide switch back and forth a few times. Turn the receiver OFF and ON again to reset the circuit to the MAIN mode.

Receiver(s) locks up when data cable is connected

  1. Data cable is inserted in the wrong port, see step 3 above and check diagrams in owner’s manual.
  2. Bad data cable. Replace, check color coding. See steps 1 and 2 above.
  3. Main/remote switches are not in their proper places for the main or slave receivers.