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1-8Nosoundinput/outputfromUSB

Symptom: Audio is not input/output :

Diagnostic procedure:

1.Connect PC with USB cable.

2.Is there clock 6MHz to ground IC901->PIN51&50 If it is not, IC901

、

X900 is damaged.

3.Is a signal input to the USB D+ & D- ? IC901 USB IN->PIN7& PIN8 , as gure 1-8

4.If it is not, IC901 is damaged.

1-9NosoundoutputfromMASTEROUT

Symptom: Audio is not output & MASTER level meter is not light up :

Diagnostic procedure:

1.Is a signal output to the DAC? U755:MASTER->PIN15&PIN18

A. If it is, something is wrong with the analog -circuit block. Check if output amplier (U515:MASTER) is

working normally. Check if each MUTE transistor (Q512~513) BASE PIN is -12V.

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

U755 :MASTER->PIN1 & PIN2 & PIN3 & PIN4 , as gure 1-9.

1-10NosoundoutputfromBOOTH

Symptom: Audio is not output :

Diagnostic procedure:

1. Is a signal output to the DAC? U756:BOOTH->PIN15 & PIN18

A. If it is, something is wrong with the analog -circuit block. Check if output amplier (U510)

is working normally. Check if each MUTE transistor (Q526~Q529) BASE PIN is -12V.

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

U756:BOOTH ->PIN1 & PIN2 & PIN3 & PIN4, as gure 1-9.

1-9 U755 PIN 21-9 U755 PIN 1

1-8 IC901 PIN7& PIN8

1-9 U755 PIN 4

1-9 U755 PIN 3

Denon MC6000MK2EM User Manual

Questions and Answers: