Toshiba D-VR7KC Service Manual page 40

C
Is the 5V voltage supplied to Pin(5, 15, 32, 36, 46) of
IC1451, or the 9V voltage supplied to Pin(3) of IC1451?
Is the serial data and the clock signal supplied to
Pin(37, 38) of IC1451?
Is the "L" pulse inputted into the Pin(49) of IC1451?
Is the audio signal outputted to Pin(78, 80) of
IC1451?
Is the audio signal inputted into Pin(3,13) of
IC2406?
Is the audio signal outputted to Pin(4,14) of
IC2406?
Check the line between Pin(4,14) of IC2406 and
the audio output terminal (JK2751), and replace P1
(BOARD MCV) if defective.
Yes
Yes
Yes
Yes
Yes
Yes
No
Check the circuit of AL+5V, P-ON+5V(2) and
P-ON+9V, and replace P1 (BOARD MCV) or
P3 (BOARD POWER SUPPLY) if defective.
No
Check the line between Pin(37, 38) of IC1451 and
Pin(17,18) of IC1501, and replace P1 (BOARD
MCV) if defective.
No
Check the line between Pin(49) of IC1451 and
Pin(31) of IC1501, and replace P1 (BOARD MCV)
if defective.
No
Replace P1 (BOARD MCV).
No
Check the line between Pin(78, 80) of IC1451 and
Pin(3,13) of IC2406, and replace P1 (BOARD
MCV) if defective.
No
Is 5V voltage supplied to Pin(16) of IC2406, or -5V
voltage supplied to Pin(7) of IC2406?
Yes
Check the AL+5V line and the AL-5V line, and
replace P1 (BOARD MCV) or P3 (BOARD
POWER SUPPLY) if defective.
Is the "H" pulse inputted into the Pin(9,10,11) of IC2406?
Yes
Replace
P1 (BOARD MCV).
1-10-17
No
No
Replace
P1 (BOARD MCV).
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