2. Service
Assembly/Module Diagnostic Trees (Diagnostic Section 3)
121
3.9.1.2 A19 Loaded Power-Supply Voltages
1 Remove power and reconnect A19 by firmly seating the plug
at A1J11.
2 Reapply power. (Wait until LCD displays Fatal Error.)
3 Measure A19 supply voltages with a DMM at test points TP9, TP8 and TP7
on A6 to verify compliance as follows:
TP9, (+12 v nominal), more than 11.75 and less than 12.75 volts.
TP8, (-12 v nominal), more than -12.75 and less than -11.75 volts.
TP7, (+10.8 v nominal), more than 10.3 and less than 11.3 volts.
QUESTION: Are the power supply voltages correct?
If Yes: Go to, 3.9.1.3.
If No: Go to, 3.9.1.2.1.
3.9.1.2.1 A19 Power Fault
1 Remove instrument power.
2 Replace A6.
3 Reapply power. (Wait until LCD displays Warming
up.)
4 Use the CONFIG/Mode menu to go to STANDBY.
5 Measure the A19 supply voltages with a DMM at test points TP9,
TP8 and TP7 on A6 to verify compliance as follows:
TP9, (+12 v nominal), more than 11.75 and less than 12.75 volts.
TP8, (-12 v nominal), more than -12.75 and less than -11.75 volts.
TP7, (+10.8 v nominal), more than 10.3 and less than 11.3 volts.
QUESTION: Are the power supply voltages correct?
If Yes: Go to, 3.9.1.3.
If No: Remove power, replace A19, check the fuses on A6 (replace
as necessary), and re-test from 3.9.1.2.
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