Troubleshoot Ing - Vivitar 283 Service Manual

Automatic Electronic Flash
Model 283
4.4 TROUBLESHOOTING
The charts in this section present step-by-step procedures for determining and correcting some of the most
common troubles that can occur with the Vivitar Model 283 Automatic Electronic Flash. In t roubleshoot-
ing, also refer to the circuit diagram in Section 5, the principles of operation and circuit descriptions in
Section 2, and the operational checkout and electronic component values in 4.2 and 4.3
1. TROUBLE:
No flash, no ready light, no oscillation.
ACTION
INDICATION
REMARKS
A. Check battery voltage GOOD
Go to step B
BAO
Replace batteries
B.
Check battery contacts in cartridge and ter- GOOD
Go to step C
minals in case for corrosion; check polarity
of terminals
BAD Clean, replace or re-
position
c.
Check current draw with power unit HIGH
Go t o step F
NONE
Go to step 0
0 . Check continuity between terminals and GOOD
Go to step E
PC board; check wires for breaks, connec-
tions on board for good solder BAD
Repair or replace
E. Check ON/OFF switch continuity
GOOD Go to step F
BAD
Replace switch
F. Check oscillator transistor 01 resistances GOOD
Go to step G
(see Sec. 4.3.2)
BAD
Replace 0 1
G. Check oscillator transformer T1 (see Sec. GOOD
Go to step H
4.3.3 for resistances)
BAD
Replace T 1
H.
Check transistor 02 resistances (see Sec. GOOD
Go to step I
4.3.2)
BAD
Replace 02
I.
Check all associated components o n PC GOOD
Check for damaged
board B
components through-
out
BAD
Replace component(s)
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Vlvltu 374601598 (11/80 )
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