Akai PDP4294LV1 Service Manual download pdf (Page 87)

DMM( + terminal)

DMM(- terminal)

DMM (- terminal)

DMM (+ terminal)

■

IC input checking

Inside of IC , there is 4 ea diodes which separated in 2 series .

(input 2, output 2)

*how to check

1.contact DMM - terminal to a right terminal of condenser(GND)

and DMM + terminal to a right terminal of IC, normal value 0.66 (fig.1)

2.contact DMM - terminal to Output terminal of resistor, and

DMM + terminal to a right terminal of IC , normal value 0.73 (fig.2)

Fig. 1

Fig. 2

4. Trouble shooting.

◎

Checking address COF input of resistor and IC

1 2 ... 82 83 84 85 86 87 88 89 90 91 92 ... 102 103

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Akai PDP4294LV1 Service Manual Page 87