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The malfunction is remedied by changing the value of resistors R377 and R378
from 220 Q to 180 Q. After replacement, trimmer RV303 (Zero level) should be
re-adjusted as detailed in point C.2.
The resistors have already been changed in version -/02 of PM 5775 and the major
part of version -/02 of PM 5776.
4. DC offset
Set the pulse generator controls as follows:
REPETITION TIME, S1
TRIGG. or SINGLE SHOT (no signal in)
NORM. INV., S8
NORM.
AMPLITUDE IN 50 Q, S4
+3 V
DC OFFSET IN 50 2, RV4
+1.5 V (resp. —1:5 V)
— Connect the mA-meter to socket PULSE OUT, 50 Q, P3.
— Read 63 mA + 5 % on the meter, + and — with control DC OFFSET IN 50 Q
turned fully clockwise and fully counter-clockwise resp.
If necessary, adjust with RV305 (+) and/or RV304 (—).
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