2. Service
Functional-Group-Diagnostic Trees (Diagnostic Section 2)
74
Analog-Signal Chain Diagnostic Tree
(Functional-Group Subsection 2)
This subsection describes the analog-signal chain diagnostic tree.
The tree provides information to check both A14 Signal-Amplifier
module and A6 Servo assembly.
2.2.1.0 A6 TP 5 and 6 Voltage Test 1
1 Remove instrument power.
2 Mount A6 on the short extender board (05071-60051).
3 Disconnect the CBT wiring harness from A2J2.
4 Connect the output of the resistive current source (05071-60274) to
the input connector of A14, instead of the cable from the CBT. (Do
not connect the ET-current-source input lead at this time.)
5 Ensure that the power and signal cable from A14 is seated in A6J3.
6 Reapply power and wait until the LCD displays Fatal
Error.
7 Verify that the gain value displayed via the INFO/GAIN menu
selections is 14.4%.
8 Measure the following voltages:
Gnd to A6-TP5; voltage should be between 10.3 and 11.3 volts.
Gnd to A6-TP6; voltage should be between -11.3 and -10.3 volts.
QUESTION: Are the voltages within the above specification?
If Yes: Go to, 2.2.2.0.
If No: Go to, 2.2.1.1.
2.2.1.1 A6 TP 5 and 6 Voltage Test 2
1 Disconnect the Signal Amplifier power/signal cable from A6J3.
2 Repeat the previous voltage measurements at A6-TP5 and A6-TP6 with the
same voltage limits.
QUESTION: Are the voltages within correct tolerances?
If Yes: Remove power, replace A14, and retest.
If No: Remove power, replace A6*, and retest.
*NOTE
Ensure that the jumper position of the new A6 is in the same position
as the one being replaced.
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