2. Service
Top-Level Diagnostic Tree (Diagnostic Section 1)
41
1.0.6 Servo-Lock Warning State
QUESTION: Is the amber LED flashing?
If Yes: Go to, 1.4.1, Warning-Message diagnostic tree. (For delayed
error/warnings go to 1.0.9.)
If No: Go to, 1.0.7.
1.0.7 User-Input/Output Checks
1 Check the performance of the following outputs/inputs:
(Refer to chapter 1, page 1-8 to verify operation and page 1-7 in
the Operating and Programming manual for checking the Sync
inputs with a pulse source.)
a) Both 5/10MHz outputs,
b) 1 MHz output,
c) 100 kHz output,
d) RS232 port,
e) All 1PPS outputs,
f) Both Sync inputs
g) Status Output
1) Use an oscilloscope to verify TTL-high state.
2) Put the instrument into Standby.
3) Verify transition to TTL-low state.
4) Return the instrument to Normal.
QUESTION: Did all Input/Output checks pass?
If Yes: Go to, 1.0.8.
If No: Go to, 1.5.1 (I/O diagnostic tree).
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