2. Service
Top-Level Diagnostic Tree (Diagnostic Section 1)
39
1.0.2 DC-Supply Test/Log-Record Examination
1 If the INFO/STATUS menu selections display Warming
up, use
the CONFIG, MODE, and STANDBY menu selections to place the
5071A into STANDBY mode. (This will put the instrument into a
stable state if it has not gone to Fatal Error mode.)
2 Record all information in the log (LOG/BROWSE menu selections).
3 Clear the log (use LOG/CLEAR).
4 Install the short extender board (part number 05071-68051) into
the spare slot on the A1 motherboard.
5 Use a DMM (with point-tipped probes) set for dc volts to measure
the +5, +12, and -12 volt supplies on the extender-board test-
voltage points to chassis ground. They should all be within the
following ranges:
+5V = 5.28 to 5.50 volts
+12V = 12.08 to 12.40 volts
-12V = -12.08 to -12.40 volts
QUESTION: Are the measured voltages within the given ranges?
If Yes: Go to, 1.0.3
If No: Go to, 2.1.1.1.0 (Power-supply diagnostic tree).
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