Sony HT-CT800 Service Manual page 43

2019/09/24 22:06:08 (GMT+09:00)
3. The sound is not outputted
The sound is not outputted.
Yes
Entering the "DEMO MODE" (touch
the [INPUT] button for five seconds),
Yes
and then the "DEMO MODE" sound
is outputted.
(Touch the [1] button to release the
"DEMO MODE")
No
The PWM signal is inputted INPUT
_A (pin 5), INPUT_B (pin 6), INPUT
Yes
_C (pin 14) and INPUT_D (pin 15)
lines of IC6005 on the MB-1612
board.
No
Check the B+ line and signal line of
the IC705 and IC6004 on the MB-
1612 board, and then replace the
complete MB-1612 board.
4. Power is not turned on
Power is not turned on.
Yes
The voltage of the following is 33 V.
POWER board: CN904 pin 3 to 5
No
The voltage of the following is 12 to
18 V.
POWER board: CN904 pin 9
Yes
No
The voltage of the following is 3.3 V.
MB-1612 board: IC5001 pin 1
Yes
No
Vibrator (X5001) on the MB-1612
board is oscillated after AC input.
Yes
The reset signal is inputted to pin
No
49 of IC5001 on the MB-1612 board
after AC input.
Yes
Replace the MB-1612 board.
HT-CT800
Check the signal path for being inputted to
the IC101 on the MB-1612 board, and
then replace the complete MB-1612 board.
(IC101 and digital power amplifier
(IC6005) on the MB-1612 board is OK)
Check the OUT_A (pin 39, 40), OUT_B
(pin 35), OUT_C (pin 32) and OUT_D
The voltage of the following is 33 V.
Yes
(pin 27, 28) lines of IC6005 on the MB-
MB-1612 board: IC6005 pin 29 to 31,
1612 board do not short-circuits or opens.
36 to 38 (PVDD)
If there is no abnormality, replace the
IC6005 on the MB-1612 board.
No
Check the fuses (F6002, F6003) on the
MB-1612 board and if it damaged, replace
the fuses (F6002, F6003) on the MB-1612
board.
No
Fuse (F901) on the POWER board Replace the fuse (F901) on the POWER
conduct the electricity. board.
Yes
POWER board is damaged.
The voltage of the following is 3.3 V.
MB-1612 board: C356 (JL326)
No
MB-1612 board: C364 (JL330) Replace the MB-1612 board.
The voltage of the following is 12 to 18 V.
MB-1612 board: IC306 pin 5
Replace the MB-1612 board.
Check the area surrounding IC5005 on
the MB-1612 board, and then replace the
MB-1612 board.
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HT-CT800
SYS SET