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2. Service

Functional-Group-Diagnostic Trees (Diagnostic Section 2)

2.1.1.2.0 AC-Line Fuse Fault Isolation, Rule Out A11

1 Ensure that proper line fuse and line-switch setting (for the available ac-input

voltage) are used. (See operating manual for details.)

2 Replace ac-line fuse.

3 Disconnect A11P101 to isolate the problem.

4 Apply ac-line voltage again.

5 Check the ac-line fuse immediately for possible open condition.

QUESTION: Did the line fuse blow?

If Yes: Go to 2.1.1.2.1.

If No: Go to 2.1.2.4.0.

2.1.1.2.1 AC-Line Fuse Fault Isolation: Rule Out A1

1 Replace ac-line fuse.

2 Disconnect the ac-line toroidal transformer connector going to A1J5.

3 Apply ac-line voltage again.

4 Check the ac-line fuse immediately for possible open condition.

QUESTION: Did the line fuse blow?

If Yes: Go to, 2.1.2.2.0.

If No: Go to, 2.1.2.3.0.

2.1.2.2.0 AC-Line Fuse Fault Isolation: Rule Out LF1/T1

Fault is between the ac-line connector on the back panel, the ac-line toroidal

transformer, or the cable connecting the two.

1 Disconnect LF1 (line filter/cable assembly 05071-60259) at the bulkhead by

the toroidal power transformer T1.

2 Replace the line fuse.

3 Re-apply power to the unit.

4 Check the ac-line fuse immediately for possible open condition.

QUESTION: Did the fuse blow?

If Yes: Remove power, replace LF1 (05071-60259), and retest.

If No: Remove power, replace T1 (9100-4962), (9100-5134 for Opt. 048)

and retest.

Symmetricom 5071A Assembly And Service Manual

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