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Model 5065A
Circuit Diagrams, Theory, and Maintenance
input one-shot U6A. Circuit cannot operate until
this is done.
NOTE
When viewing A2 waveforms it is helpful to syn
chronize oscilloscope from front panel 1 PPS output.
c.
If clock time is incorrect or out of sync:
1.
Check 65 Hz oscillator (U6B, U1D, U5D), 49-
counter (U2), 49-sense, (U4C, U4A) and ampli
fier circuits (U2, 4, 5).
2.
Check operation of U3A and U3B (press HOLD
trigger U3A and reset U3B. Connect +12V to
U3(3) to operate U3A.
d.
If there is no output from A3, check 1 PPS signal
path thru U5A.
NOTE
U6A is enabled by a high level (12V) at U6(5). If this
level is incorrect repeat steps a and b. If level does
not change, trouble is in 49-count or sense circuits
(U2, U4C, U4A).
7-46
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