Vivitar 283 Service Manual page 35

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Automatic Electronic Flash
Model 283
6. TROUBLE:
Light output not according to specifications, automatic mode-auto circuit not function-
ing correctly.
ACTION
INDICATION
REMARKS
A. Adjust auto circuit via R26 (see Sec. 4 .2.9) Light output to Problem solved
specifications
Light output cannot Go to step B
be brought to speci-
fications
B. Check with test sensor Light output as Problem solved
specified
Problem not Go to step C
corrected
c. Observe OT1 ; if not firing, short SCR3 between OTl fires Go to step D
anode and cathode momentarily
If it still does not Check
quench trigger
fire capacitor Cl 9, quench-
t ube OTl , or quench
trigger transformer Tl .
Replace as
necessary.
If still not firing, check
power supply to R28,
R29, and R31 .
D.
Replace SCR3 Light output as Problem solved
specified
Problem not Go to step E
corrrected
E. Replace zenor diode D12 Light output as Problem solved
specified
Problem not
Check auto and quench
corrected
circuit components
1.
TROUBLE :
Sufficient light indicator (green light) not functioning- auto circuit working.
ACTION
INDICATION
REMARKS
A. Check lamp DS3
GOOD Go to step B
Does not light Replace lamp DS3
B. Check D9 and C10 for open circuit
GOOD Check R 14 for open
BAD Replace diode D9 or
c 10
Vivi tar 37460598 (11 /80)
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