General Maintenance
4- 16
WFM6100, WFM7000, and WFM7100 With Option FP Service Manual
3.
If the external monitor does show the nominal screen, check the gray ribbon
cable from the internal display to J17 on the Main board. This carries the
XGA data to the display.
4.
If the gray ribbon cable is OK, look at an angle into the gap at the left edge
of the LCD, turn the power off and on and you should be able to see the
backlight come on. It may help to be in a low light area to see the backlight.
5.
If the backlight is on replace the front panel assembly.
6.
If the backlight is not on, check the backlight power cable from the backlight
inverter (on the rear of the display assembly) to the Main board J18. Also
check connector J18 itself for any solder issues.
7.
If the backlight is still bad, replace the front panel assembly — although
there is still a small chance the problem is in the Main board.
It is sometimes difficult to isolate the root cause of audio problems. Most audio
problems are due to faults on the Audio board, but the Audio board communi-
cates with the Main board, so in some cases the problem may be there as well.
Audio POST Detailed Information.
The Power On Self Test (POST) does the
following:
H
Reads all of the AES decoder internal registers and verifies that what is read
is correct.
H
Reads all of the D/A internal registers and verifies that what was read is
correct.
H
Performs an active-bit test on the A/D output clocks.
H
Checks the serial EEPROM to see which of the analog inputs have been
calibrated.
H
Tests the Audio DSP/FPGA interface.
H
The main CPU detects if the DSP heartbeat fails. This condition will be
shown in the diagnostic log.
For Audio boards, not all errors are reported by the power up diagnostics.
Therefore, if you are detecting a loss in audio functionality, check the diagnostic
log for any reported audio errors. If any errors are found, perform the following
procedure to narrow the problem to either the Audio board, the Main board, or
the connection between them.
Audio POST Failure
Содержание WFM6100 Opt. MB
Страница 4: ......
Страница 12: ...Service Safety Summary viii WFM6100 WFM7000 and WFM7100 With Option FP Service Manual ...
Страница 64: ...Repackaging Instructions 4 34 WFM6100 WFM7000 and WFM7100 With Option FP Service Manual ...
Страница 76: ...Replaceable Parts 5 12 WFM6100 WFM7000 and WFM7100 With Option FP Service Manual ...