Akai PDP4294LV1, Service Manual, Page: 87 / 112

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