TROUBLESHOOTING
Before
replacing any circuit boards, recover the “Last Failure” code using Chipper
Check. Also, it’s very important when
troubleshooting to accurately identify the symptom in order to quickly isolate
which circuit board or item has failed.
Dead Set/No Start. (No relay click/No
Power LED when AC applied)
Main Power Supply Board: Standby voltage is needed by the DM2CR and is obtained from
the ACINCBA. If the standby supply doesn’t turn on when AC is applied, the
relay will not energize and the DM2CR doesn’t have the supply it needs.
DM2CR Module: If the power supply is OK but the DM2CR
doesn’t respond to power on commands then the DM2CR module has likely failed.
No Picture, Audio OK: (Relay click OK when AC applied,
Power LED Flashes 4-5 times then stays on) The LED will only flash one time (4
to 5 flashes) and the unit must be reset by unplugging AC to get unit to flash
again.
Lamp assembly:
Obtain failure code with Chipper Check before replacing (or subbing)
lamp assembly. A flashing Power LED
indicates a lamp or lamp power supply failure and the lamp assembly is the most
likely cause.
Lamp power supply:
If the Power LED still flashes after replacing the lamp assembly,
replace lamp power supply.
Main Power Supply Board:
The source voltage for the lamp power supply is developed on ACIN CBA.
Pixelization, Digital Freezing &/or Digital
Noise/Artifacts:
Weak terrestrial (A TSC) signal: A weak ATSC terrestrial (check strength of
terrestrial signal) signal can cause pixelization or freezing. An external
antenna can dramatically improve ATSC
reception.
Formatter CBA: Apply
2H YPrPb to an external input. If pixelization is still present replace Formatter
CBA.
DM2CR module
Always perform a ‘Reset’ by removing and reapplying AC
Power. If pixelization not present with 2H YPrPb applied to external inputs,
replace DM2CR.
Light Engine: Before replacing
light engine, confirm picture quality issues by accessing the test patterns in
the service menu 80. All patterns
accept the cross hatch are generated by the formatter CBA. The cross hatch is
generated by the light engine.
Instrument starts normally then shuts down (runs 20-30secs)
When unit shuts down,
Power LED blinks three (3) times.
Set restarts automatically after 20-30
seconds.
After3rd cycle unit remains shutdown (un-plugging
resets unit).
Failure of lamp cooling fan or DLP device cooling fan.
Poor Picture Quality.
(spots, discoloration, color impurities, etc.)
Whenever dealing with picture quality issues, always check
quality of signal source before servicing unit.
Light Engine: Before replacing light engine, confirm picture
quality issues by accessing the test patterns in the service menu 80.
All patterns accept the checker board are generated by the
formatter CBA.
The checker board is generated by the light engine.
Rotated or Offset Picture.
Misaligned Light Engine or centring: Perform mechanical rotation adjustment of light engine and/or use
service menu 76 to adjust horizontal and vertical centring.
Stuck pixels (Black and/or White)
Light Engine. The
DLP defect tolerance specification allows for no more than 2 dark pixels and 0
bright pixels.
Dead Set, No Power LED. (20-25sec boot when AC is applied, relay click OK when AC applied)
DM2CR module: When AC is first applied the DM2CR goes
through a boot up sequence. If the Power LED doesn't light when AC is applied,
the DM2CR is not booting.
Dead set. Power LED stays ON when AC is applied. (relay click OK when
AC applied)
DM2CR module: When
ACis first applied the DM2CR goes through a boot up sequence. If the Power LED
remains on when AC is applied (should go off in 20-25sec), the DM2CR is not
booting properly.
SERVICE MENU
- Turn instrument on, then press and hold Channel Down & Menu simultaneously .
- Next, select Service Alignment in menu, then volume Up to V:76 then Channel Up and Down to desired adjustment.
- After selecting adjustment, Volume Up/Down changes value of adjustment.
- Press off to exit.
Test Patterns (V :80):
- Enter service menu and volume up to V:80. Channel up to go to patterns.
- The skip button toggles the pattern and the menu button toggles between the pattern and normal video.
- To exit, press the off button.
Usage Clock (V :90):
- Enter service menu and volume up to V:90.
- Channel up for usage clock.
- Press off to exit.
Error Codes (V:50):
- Enter service menu and volume up to V:50.
- Channel up for first failure code.
- Channel up for next of 8 failure codes.
- Pressing clear removes error code.
- Last error is most recent failure code.
- I.E: if four (4) errors are listed, four is the most recent.
- To exit, press the off button.
TEST POINTS & VOLTAGES
Standby power supply [14000 series TPs are located on main power supply board.
Run power supply [14000 series. TPs are located on main supply board]
Lamp drive voltage - From main power supply board
I /O Circuit board [Main signals and Power Supplies]
CLICK ON PICTURES TO MAGNIFY
