Symmetricom 5071A - Page 103

2. Service
Assembly/Module Diagnostic Trees (Diagnostic Section 3)
87
3.1.2.1.3 Thermistor Monitor Test 1 (Current On)
1 Place a 10 k resistor between pins 1 and 7 on connector XA2P2
(48-pin connector on extender card).
2 Use SCPI command syst:print?.
(Terminal-to-instrument via RS-232C data communication required.)
QUESTION: Is thermistor between 9.35 and 9.75 C?
If Yes: Go to, 3.1.2.1.4.
If No: Remove power, replace A7, and retest.
3.1.2.1.4 Thermistor Monitor Test 2 (Current On)
1 Place a 10 k resistor between pins 3 and 7 on connector XA2P2.
2 Use SCPI command syst:print?.
(Terminal-to-instrument via RS-232C data communication required.)
QUESTION: Is thermistor between -9.35 and -9.75 C?
If Yes: Remove power, replace A2, and retest.
If No: Remove power, replace A7, and retest.