Olympus OM-4 Handbuch zur Fehlersuche - Seite 13

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2. Metering Circuit Malfunctions

A. External Observations:

Bar graph indications are high or "over."

"Spot-Auto" speeds fast.

"Auto" speeds fast or normal

"Manual" speeds normal.

B. External Observations:

Bar graph indicates low or "under."

"Spot-Auto" speeds slow,

"Auto" speeds slow or normal

"Manual" speeds normal.

First, check bar graph response to light, ASA, and AV

changes to isolate problem. Follow the same pro-

cedure as 2-A, but look for the following:

1, Low voltage at pin 7, IC-102.

2, Open connections to VR-105 and VR-106,

3, Open connection to, or poor contact of, AV-VR

wiper.

4, Solder bridge around SV-VR terminals or shorted

wiring,

5, Short between pins 67, 68, 69, IC-102.

OLYMPUS OM-4, PAGE 13