Denon DN-X600 Service Manual page 30

FLOW CHART NO.8 (8U-110087-1 : PANEL UNIT)
The key operation is not functioning.
Are the contact point and the installation state of
the key switches (S401~S411,S413,S414,S416,
S418~S420), rotary switches (S433,S434,S437)
nomal?
Does LED(D105~D111,D113~D156) light correctly?
When pressing each key switches and turning rotary
switches, do the voltage of each pin of U404(shown
below) increase?
Key switches
S401,S403,S407
S402,S408,S418
S405,S419
S404,S410,S420
S406
S414
S409,S411,S413
S416
Rotary switches
S433,S434,S437
S433,S434,S437
S433,S434,S437
S433,S434,S437
S433,S434,S437
S433,S434,S437
S437
S437
Replace U404.
O.K.
O.K.
O.K.
: U404 11pin
: U404 12pin
: U404 13pin
: U404 14pin
: U404 3pin
: U404 4pin
: U404 5pin
: U404 6pin
: U404 11pin
: U404 12pin
: U404 13pin
: U404 14pin
: U404 3pin
: U404 4pin
: U404 5pin
: U404 6pin
O.K.
N.G.
Re-install the switches correctly or replace the poor
switch.
N.G.
Check the Q101~Q114 and their periphery, and
service it if detective.
Check the key switches (S401~S411,S413,S
N.G.
414,S416,S418~S420), and rotary switches
(S433,S434,S437) and their periphery, and service
it if detective.
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