2. Service
Functional-Group-Diagnostic Trees (Diagnostic Section 2)
69
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.
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