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2. Service

Top-Level Diagnostic Tree (Diagnostic Section 1)

1.0.3 Power On Fatal Error Check

1 Cycle power to the instrument, wait fifteen seconds.

2 Go to the INFO/STATUS section of the front-panel menu.

QUESTION: What state is the 5071A in?

If Warming Up, Go to, 1.0.2, perform step 1, then go to 1.0.4.,

If in Fatal

Error, Go to, 1.1.1 (Power-On Fatal-Error diagnostic tree).

NOTE

For some test purposes it is useful to force the instrument into the

fatal error state. This can be done by applying power with A2P3

disconnected from A2J2.

1.0.4 Instrument Self Tests

1 Execute all Self tests from front panel in Standby mode as follows:

a) Go to the UTIL menu, select TEST option, and press Enter.

b) Press INC to initiate the Self test cycle.

c) Observe the front-panel display CYCLES = 0: when 0 changes to

1 or greater, all Self tests have passed.

d) If a Self test routine fails, record the displayed message and attempt

to continue the tests by pressing INC again.

e) Press DEC to halt Self test execution.

QUESTION: Did the 5071A pass all the Self tests?

If Yes: Go to, 1.0.5

If No: Go to, 1.2.1 (Self-test diagnostic tree).

1.0.5 CBT Warm Up

1 Change operating mode to NORMAL (press CONFIG, MODE, and

NORMAL), the instrument state changes to Warming up.

2 Wait until the green LED is flashing, or 45 minutes have passed.

QUESTION: Does the green LED continue to flash for at least

60 seconds?

If Yes: Go to, 1.0.6.

If No: Go to, 1.3.1, Warm-up and Operating Error diagnostic tree.

(For delayed error conditions, go to 1.0.9.)

Symmetricom 5071A Assembly And Service Manual

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