Olympus OM-4 Handbuch zur Fehlersuche - Seite 9

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,ir-i03

This 1C lives beneath the mirror box floor and can only

be reached by removing the front plate. Its outputs are

BV (measured at pin 7, IC102) and integration

(measured at pin 3, IC-102). If these are correct, the 1C is

probably working. If not, you may want to remove the

front plate, then check connections according to the

drawing,

Pin 16 is the BV output measured at pin 7, IC102.

Typical voltage is l,5v to 1.7v, 18mv/LV.

Pin 10 is integration output measured at pin 3, IC-103.

See scope trace for "Auto" mode.

IC-104

This 1C lives under a circuit board between the prism and

ASA resistor. It is not easy to reach for tests, but

important inputs can be checked at ICs 101 and 102, Its

output, of course, is the LCD,

Pin 1 is CLK input, Check at pin 53,IC-I02 and the white

wire,

Pin 5 is Vcc in from IC-102. Check at pin 54, IC-102.

Pin 6 is B-,

Pin 11 is data sync signal from IC-101. Check scope trace

at pin 12, IC-101 and the green wire.

Pin 12 is serial data in. Check scope trace at pin I I ,

IC-101 and the yellow wire.

Pin 13 is data clock signal in. Check at pin 10, IC-101

and the blue wire.

If there is no display, check for proper connections to

pins 3 and 4 and from there to capacitor C-3Q2. This is the

6-volt power source for the LCD,

OLYMPUS OM-4, PAGE 9