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4. Trouble shooting.
Checking address COF input of resistor and IC
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IC input checking
Inside of IC , there is 4 ea diodes which separated in 2 series .
(input 2, output 2)
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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 is
2.contact DMM - terminal to Output terminal of resistor, and
DMM + terminal to a right terminal of IC , normal value is
Fig. 1
Fig. 2
DMM(- terminal)
DMM( + terminal)
0.68
(fig.1)
0.745
(fig.2)
Confirm this position.
`
DMM (- terminal)
31 /39
DMM (+ terminal)
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