Procedure; Blue Flash - Sony DSC-S75 Training Manual

Since the flash circuits and its control lines are spread out over a number of boards, the basic troubleshooting
procedure is to identify the board or the flash module causing the problem and replace it.

Procedure

The best diagnostic tool is the yellow indicator LED
that blinks while the flash capacitors are charging.
? The indicator LED starts blinking when IC102
outputs a LOW on the STB_CHARGE line (the
capacitors charge up) and turns stops when the
XSTB_FULL goes LOW and the capacitors are
charged.
? The LED will continuously blink if the capacitors
do not charge up. This is an indication that the
dc-dc converter, Q405/Q406 and /or F405 may
be defective.
? LED does not blink. This is likely to be caused
by IC102 on the FR-181 board not outputting a
HIGH on the STB_CHARGE line.
LED blinks normally then shuts off normally but the flash does not work: The following items may be defective:
? Pop-up solenoid
? Flash Assembly
? Pop-up switch
? FRONT CONTROL IC102 (not responding to XSTB_POPUP)
? A viewfinder error code of E:91:oo indicates a charging defect and the flash assembly may have to be
replaced.
? Excessively blue picture when using flash
Checking the charge on the storage capacitors
The charge on the storage capacitors may be
checked with a DVM if precautions normally
associated with high voltage are taken.
USE CAUTION WHEN CHECKING STORAGE
CAPACITORS – A fully charged capacitor stores
up to 300 volts for days.

Blue Flash

Cameras with an overly blue picture should be sent
to Sony for repairs. The repairs require expensive
equipment that is not normally available. Refer to
ESI bulletin E14843941
42
16. DSC-F707 Flash Circuit