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MODEL
8559A
SERVICE
Auto Scan
Time
(AST) Accuracy:
Observe front panel switch positions to isolate the problem area. Auto
scan time can also be affected by circuits on the Sweep
Generator/Bandwidth Control Assembly A9 and the
VIDEO FILTER control position. If the AST problem is band
-
related, the Marker Assembly A8 is the most
probable cause. If the AST problem is either bandwidth
-
or scanwidth
-
related, the most probable cause is the
Sweep
Generator/Bandwidth Control Assembly A9. The greater the load on the AST line, the greater the
current demand. The greater the current demand, the faster the sweep rate.
Residual
FM:
Residual
FM
can originate from the Second
LO
Driver (block
E).
The most common failures
are: R88, R87, R33, R34,
U1, U7, R37, and R38, in that order.