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1-11NosoundoutputfromPHONES

Symptom: Audio is not output :

Diagnostic procedure:

1. Is a signal output to the DAC? U759:PHONES->PIN15 & PIN18

A. If it is, something is wrong with the analog -circuit block. Check if output amplier (U512: PHONES) is

working normally. Check if each MUTE transistor (Q550~Q553:PHONES)BASE PIN is -12V.

B. If it is not, something is wrong with the digital-circuit block. Check if there is CLOCK signal for

U759 :PHONE->PIN1 & PIN2 & PIN3 & PIN4, as gure 1-9.

1-12NosoundinputfromMIC1

Symptom: Audio is not input:

Diagnostic procedure:

1. Is a signal input to the ADC ? MIC(U752) ->PIN10

A. If it is not, something is wrong with the analog-circuit block. Check if OPA MIC(U513) is working

normally.

B. If it is, something is wrong with the digital-circuit block. Check if there is CLOCK signal for MIC(U752) -

>PIN2 & PIN4 & PIN7 & PIN8, as gure 1-9

1-9 U755 PIN 21-9 U755 PIN 1

1-9 U755 PIN 4

1-9 U755 PIN 3

Denon MC6000MK2EM User Manual

Questions and Answers: