Vivitar 283 Service Manual page 33

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Automat ic Electronic Flash
Model 283
2. TROUBLE:
Ready light on, but not blinking- battery saver not functioning .
ACTION " INDICATION REMARKS
,
A.
Check battery voltage, contacts, and ter- GOOD
G6
to step B
minals
BAD
Replace,
clean, or re-
position
8 . Check voltage of main capacitor C1 (See Sec.
330V Go to step C
4.2.4 ) and ad just if necessary
Less than 330V; Go to step D
cannot be adjusted
C.
Replace thyristor SC R 1
Ready light light still Check associated
not blinking components
D.
Check main capacitor C 1 for leakage
Leaks Replace C1 and,
if
ready light still doesn't
blink, go to step E
Does not leak
Go to step E
E. Replace diodes D3 and D4
Light does not blink
Check all associated
components and wires
3. TROUBLE:
No flash, no ready light, but there is oscillation.
ACTION INDICATION
REMARKS
A. Check oscillator t ransformer T 1 output voltage
Average approx. G.o to step B
Connect meter between positive terminal of 130VAC average
main capacitor C1 and terminal 5 of T1 . Use 500V
scale, AC
8 . Check diodes D3 and D4
GOOD
Go to step C
Open circuit or Replace
leakage
-
C.
Check main capacitor C1 for leakage (see Sec. GOOD
Check PC board insula-
4.2.5)
tion for leakage
Leaks
Replace
Vivi tar 37460598 (1 1/80)
27