Denon DN-X1600 Service Manual page 24

FLOW CHART NO.9 (8U-110070-1:EFECT UNIT)
The key operation is not functioning.
Are the contact point and the installation state of
the key switches (S601 ～ S611, S613) normal?
Does LED (LD601 ～ LD616) light correctly?
When pressing each key switches, pressing and
turning encoder switches, do the voltage of each pin
of IC406, IC407on the 8U-110069-1 board (shown
below) increase?
Key switches
S605,609 ：IC406 4pin
S601,606,610 ：IC406 5pin
S602,611 ：IC406 6pin
S603,607 ：IC407 11pin
S604,608,613 ：IC407 12pin
Encoder switches(pressing)
S614 ：IC407 6pin
Encoder switches(turning)
S614 ：IC407 5pin
S614 ：IC407 6pin
Replace IC406 or IC407 on the 8U-110069-1 board.
O.K.
O.K.
O.K.
O.K.
N.G.
Re-install the switches correctly or replace the poor
switch.
N.G.
Check the TR114 ～ TR116 and their periphery, and
service it if detective.
Check the key switches (S601 ～ S611,S613) and
N.G.
encoder switches (S614) and their periphery, and
service it if detective.
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