Denon DVD-910 Service Manual page 15

QQ
3 7 63 1515 0
FLOW CHART NO.12
The fluorescent display tube does not light up.
Is 3.3V voltage supplied to Pin(6) and
Pin(24) of IC2001?
Is the voltage of approximately -24V to -28V
supplied to Pin(15) of IC2001?
Is there 500kHz oscillation at Pin(26) of IC2001?
Are the filament voltage supplied between
Pins(1, 2) and Pins(34, 35) of the fluorescent
display tube? And the negative voltage applied
between these pins and GND?
Replace the fluorescent display tube.
FLOW CHART NO.13
TE The key operation is not functioning.
L 13942296513
Are the contact point and the installation state of the
key switches (SW2001, 6401-6414) normal?
When pressing each switches (SW6401-6403,
6405, 6407-6414), do the voltage of each pin
of IC2001 (shown below) switch to 75mV from
6mV?
SW6401-6403, 6405, 6407, 6413, 6414: IC2001 3PIN
SW6408-6412: IC2001 4PIN
When pressing each switches (SW2001, 6404,
6406), is the normal control voltage inputted to
Pin(8) of IC2001?
SW2001: 0 - 0.49V
SW6406: 0.49 - 1.49V
SW6404: 1.49 - 2.42V
Replace IC2001.
www
.
http://www.xiaoyu163.com
Yes
Yes
Yes
Yes
Yes
Yes
x ao u163
y
i
http://www.xiaoyu163.com
2 9
8
No
Check the EV+3.3V line and service it if detective.
No
Check the -FL (-28V) line and service it if detective.
No
Check R2015, IC2001 and their periphery, and
service it if detective.
Check D1016, D1017, T1001, and their periphery,
and service it if detective.
No
Is -17V voltage supplied to collector of Q1005?
Is the "H" signal inputted
to base of Q1016?
Check Q1015, Q1016, D1055, and
their periphery, and service it if detective.
Q Q
3 6 7 1 3 1 5
No
Re-install the switches (SW2001, 6401-6414)
correctly or replace the poor switch.
No
Check the switches (SW2001, 6401-6414)
and their periphery, and service it if detective.
co
.
15
DVD-910
9 4 2 8
No
Yes
Check PWRCON
line, and service
No
it if detective.
Yes
0 5 8 2 9 9 4 2 8
m
15
9 9
9 9