General Maintenance
4- 12
WFM6100, WFM7000, and WFM7100 With Option FP Service Manual
Detailed Troubleshooting Procedures
The following tests should be run as indicated in the
Symptom and Causes
table
above. The procedures check for specific problems or will help you isolate a
problem to a board. You can run them at any time for informational purposes but
if you do not run the procedures in the correct context, then the final recommen-
dation identifying a root cause might be suspect.
List of detailed troubleshooting procedures:
H
General Checks
H
Primary Power Supply Checks
H
Secondary Power Supplies Checks
H
Front Panel Troubleshooting
H
Isolating Audio Problems
H
Isolating Advanced Diagnostic Lissajous Errors.
1.
Verify that the power cord is connected.
2.
Check that all internal cables are correctly connected and seated.
3.
Check for any discolored or burned components.
The Fan is controlled by both hardware and software. Hardware controls the fan
to a certain speed, but software sets the speed target as a function of the
temperature measured on a variety of temperature sensors.
If the fan fails, then LED DS861 on the Main board will be lit.
The fan failure is sensed through tachometer feedback, thus a fault will be
asserted if the fan is not connected, is stalled, or if the tachometer feedback line
is not working correctly.
If the fan fails, the control circuit will increase the voltage to the 13.5 V max
level.
The normal voltage to drive the fans (pin 1) varies from about 6 V to 13.5 V in
response to temperature and fan speed.
If the fan is not spinning, measure the voltage on the fan connector J890 pin 1. If
the voltage is near 13 V then replace the fan.
If the voltage is not above 10 V then replace the Main board.
If the fan is spinning, but LED DS861 is lit, the problem is probably the
tachometer feedback line on pin 3 of the fan. Inspect the wiring and pull--up
General Checks
Fan Failures
Summary of Contents for WFM6100 Opt. MB
Page 4: ......
Page 12: ...Service Safety Summary viii WFM6100 WFM7000 and WFM7100 With Option FP Service Manual ...
Page 64: ...Repackaging Instructions 4 34 WFM6100 WFM7000 and WFM7100 With Option FP Service Manual ...
Page 76: ...Replaceable Parts 5 12 WFM6100 WFM7000 and WFM7100 With Option FP Service Manual ...