Sony HT-MT500 Service Manual page 37

3. The sound is not outputted
The sound is not outputted.
Yes
Entering the "DEMO MODE" (touch
Check the signal path for being inputted
the [ ] button for five seconds),
to the IC101 on the MB-1610 board, and
Yes
and then the "DEMO MODE" sound
then replace the defective part, or replace
is outputted.
the applicable board on which the
(Touch the [ ] button to release
defective part is mounted.
the "DEMO MODE")
No
The PWM signal is inputted INPUT
The voltage of the following is about
_A (pin 5), INPUT_B (pin 6), INPUT
Yes
17.5 V.
_C (pin 14) and INPUT_D (pin 15)
BAR-AMP board: IC6001 pin 29 to 31,
lines of IC6001 on the BAR-AMP
board.
No
Check and repair the area surrounding
Check and repair the B+ line and
transistor (Q6006) on the BAR-AMP board.
signal line of the IC6009 on the
Check the fuse (F6001) on the BAR-AMP
BAR-AMP board.
board and if it damaged, replace the fuse
(F6001) on the BAR-AMP board.
4. Power is not turned on
Power is not turned on.
Yes
Check the voltage of the following.
Check and repair the area surrounding
BAR-AMP board: CN6014
No
IC6011 to IC6013 on the BAR-AMP board.
pin 1 is 13 V
If there is abnormality, replace the BAR-
pin 3, 4 are 5.2 V
AMP board.
pin 7 is 6 V
Yes
No
The voltage of the following is 3.3 V. The voltage of the following is 5.2 V.
MB-1610 board: IC303 pin 4 MB-1610 board: IC303 pin 5
Yes
No
Vibrator (X5001) on the MB-1610
Replace the MB-1610 board.
board is oscillated after AC input.
Yes
The reset signal is inputted to pin
Check the area surrounding IC5005 on
38 of IC5006 on the MB-1610 board
No
after AC input. the MB-1610 board, and then replace the
(It can check with the CN5002 pin MB-1610 board.
6 on the MB-1610 board)
Yes
Replace the MB-1610 board.
HT-MT500/MT501
Check the OUT_A (pin 39, 40), OUT_B
(pin 35), OUT_C (pin 32) and OUT_D
(pin 27, 28) lines of IC6001 on the BAR-
Yes
AMP board do not short-circuits or opens,
and then repair.
36 to 38 (PVDD)
If there is no abnormality, replace the
IC6001 on the BAR-AMP board.
No
No
Replace the MB-1610 board.
37 37
HT-MT500/MT501