HP 212A - Troubleshaotingchart

TROUBLE SHOOTING CHART (Cont'd)
r
SYMPTOM
7. UNCLSPPED PULSE,
HIGH
AMPLITUDE
PEAKS
8. HUMPED TOP OF
PULSE AT RATED
OUTPUT
u
-
DEFECTIVE
COMPONENT
R30
V7
V9
V7
SUGGESTIONS - CAUTIONS - CHECKS - ETC,
i
R30 burns open if V7 or V9 shorts, resnlt-
ing in an unclipped output pulse. Replace
defective VT or V9 and R30.
Replace V7.
Check flatness of pulse top,
9. ENLARGED TRACE
OF TOP OF PULSE
rL
Replace V17. Check regulated voltage per
instruction book.
Any cause of high ripple from VT7A can
have this effect.
Replace V 15.
Check regulated voltage
per instruction book.
Replace VP1,
V17
V15
,
Vll