Symmetricom 5071A - Page 107

2. Service
Assembly/Module Diagnostic Trees (Diagnostic Section 3)
91
3.1.4.1.3 Cesium Oven Monitor Test (+ Current On)
1 Place a 10 k resistor between pins 1 and 36 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 CBT Oven Err: between 20.0 and 21.0C°?
If Yes: Go to, 3.1.4.1.4.
If No: Remove power, replace A7, and retest.
3.1.4.1.4 Cesium Oven Monitor Test ( Current On)
1 Place a 10 k resistor Between pins 3 and 36 connector XA2P2.
2 Use SCPI command syst:print?.
(Terminal-to-instrument via RS-232C data communication required.)
QUESTION: Is CBT Oven Err: between -20.0 and -21.0 C
If Yes: Remove power, replace A2, and retest.
If No: Remove power, replace A7, and retest.