Denon DN-MC6000 Service Manual page 26

FLOW CHARTNo.9 (405-MC6000-2782 : CONTROL UNIT)
The key operation is not functioning.
Are the contact point and the installation state of
the key switches (SW101 ～ SW133,
SW135 ～ SW174), rotary switches
(SW134,SW175,SW176,SW179,SW180) and rotary
encoder (SW177) nomal?
Does LED (D50 ～ D203) light correctly?
When pressing each key switches, turning
rotary switches and turning rotary encoder, does
the voltage of each pin of IC100(shown below)
increase?
Key switches
SW100 ～ SW102,SW124 ～ SW129
SW103,SW104,SW130 ～ SW133,SW135 ～ SW137
SW106 ～ SW108,SW138 ～ SW144
SW109 ～ SW111,SW145 ～ SW150
SW112 ～ SW114,SW151 ～ SW156
SW115 ～ SW117,SW157 ～ SW162
SW118 ～ SW120,SW163 ～ SW168
SW121 ～ SW123,SW169 ～ SW174
Rotary switches
S134,SW176
SW175
SW179,SW180
Rotary encoder
SW177
Replace IC100.
O.K.
O.K.
: IC100 26pin
: IC100 27pin
: IC100 28pin
: IC100 29pin
: IC100 30pin
: IC100 31pin
: IC100 32pin
: IC100 33pin
: IC100 37pin
: IC100 41pin
: IC100 47pin
: IC100 10,11pin
O.K.
N.G.
Re-install the switches correctly or replace the poor
switch.
Check the Q50,Q101 ～ Q114,Q119 ～ Q126,
N.G.
Q129 ～ Q138 and their periphery, and replace it if
defective.
Check key switches(SW101 ～ SW133,SW135 ～
N.G.
SW174), rotary switches(SW134,SW175,SW176,
SW179,SW180), rotary encoder(SW177) and their
periphery, and replace it if defective.
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