Denon DVM-2845CI Service Manual page 21

FLOW CHART NO.12
The fluorescent display tube does not light up.
Is 3.3V voltage supplied to Pin(13) and
Pin(43) of IC2001?
Is the voltage of approximately -24V to -28V
supplied to Pin(30) of IC2001?
Replace the fluorescent display tube or IC2001.
FLOW CHART NO.13
The key operation is not functioning.
Are the contact point and the installation state of the
key switches (SW2101, 2102, 2203 - 2215) normal?
Is the control voltage normally supplied to pins(40,
41, 42) of IC3001?
Replace IC3001.
Yes
Yes
Terminal Voltage of Pins (40 - 42) on IC3001
VOLTAGE
APPROX.
0V
APPROX.
0.7V
APPROX.
1.3V
APPROX.
2.0V
APPROX.
2.7V
APPROX.
3.3V
Yes
Yes
No
Check the P-ON+3.3V line and service it if defective.
No
Check the -FL line and service it if defective.
No
Reinstall the switches (SW2101, 2102, 2203 - 2215)
correctly or replace the poor switch.
IC3001
42pin 41pin
KEY1 KEY2
SW2206
SW2101
POWER SKIP DOWN
SW2102 SW2207
HDMI SKIP UP
SW2203 SW2208
PLAY DISC CHANGE
SW2204 SW2209
PAUSE DISC5
SW2205 SW2210
STOP SKIP
(KEY OFF) (KEY OFF)
No
Check the switches (SW2101, 2102, 2201 - 2214)
and their periphery, and service it if defective.
21
DVM-2845CI
40pin
KEY3
SW2211
DISC3
SW2212
DISC4
SW2213
DISC2
SW2214
DISC1
SW2215
OPEN/CLOSE
(KEY OFF)