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690XXB/691XXB MM
5-13
TROUBLESHOOTING
TROUBLESHOOTING
TABLES
690XXB/691XXB Will Not Turn On
(
OPERATE
light is
ON
)
Normal Operation: When the 690XXB/691XXB is connected to the
power source, the
OPERATE
light should illuminate and the instru-
ment should power up.
Step 1.
Remove the 690XXB/691XXB top cover and the cover over
the A18 and A19 PCBs.
Step 2.
Connect the negative lead of the DMM to A18TP1 and the
positive lead to A18TP3.
Step 3.
Check for a +23.58
±
0.5 volt reading on the DMM.
q
If the voltage is correct, go to step 4.
q
If the voltage is incorrect or missing, the Front Panel as-
sembly or the cable between Motherboard connector
A20J22 and the Front Panel assembly may be defective.
Step 4.
Press the front panel
RF OUTPUT ON/OFF
button. Do the
yellow and red LEDs toggle?
q
If yes, the malfunction may be caused by a failed front
panel circuit. Replace the Front Panel assembly.
q
If the LEDs do not toggle or if both LEDs are lit, the
problem may be caused by a malfunction on the A17 CPU
PCB.
Table 5-4.
Malfunctions Not Displaying an Error Message (2 of 2)
Содержание 680 C Series
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