Toshiba D-R560KU Service Manual page 20

FLOW CHART NO.15
The fluorescent display tube does not light up.
Is 3.3V voltage supplied to Pin(6, 24) of IC3001?
Is approximately -24V to -28V voltage supplied to
Pin(15) of IC3001?
Is there approximately 500kHz oscillation to
Pin(26) of IC3001?
Are the filament voltage applied between (1)
and (28) of the fluorescent display tube?
Also negative voltage applied between these pins
and GND?
Replace P4(BOARD FRONT).
FLOW CHART NO.16
The key operation is not functioning.
Are the contact point and the installation state of
the key switches normal?
Is the control voltage normally inputted into
Pin(1, 2) of IC1501?
Replace P1(AV ASSEMBLY) or P2(DVD
MECHANISM & DVD MAIN BOARD ASSEMBLY).
Yes
Yes
Yes
Yes
Yes
Yes
No
Check the EV+3.3V line and replace
P1(AV ASSEMBLY) or P4(BOARD FRONT)
if defective.
No
Check the -FL line and replace P1(AV ASSEMBLY)
or P4(BOARD FRONT) if defective.
No
Check R3003, IC3001 and their periphery, and
replace P4(BOARD FRONT) if defective.
No
Check D1051, D1053, C1051 and their periphery,
and replace P1(AV ASSEMBLY) or
P4(BOARD FRONT) if defective.
No
Re-install some key switches correctly or replace
P1(AV ASSEMBLY) or P4(BOARD FRONT).
No
Check the key switches and their periphery, and
replace P4(BOARD FRONT) if defective.
Terminal voltage of IC1501-1,2
3.300
2.479
2.464
1.746
1.730
1.115
1.100
0.484
0.469
0.161
0.146
(V)
1-8-4
KEY -1 KEY-2
IC1501-1 IC1501-2
----- -----
-----
REC
PLAY -----
OPEN
STOP
/CLOSE
-----
SKIP-UP
SKIP-
POWER
DOWN
E7M70TR