HT-CT380/CT381
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2. The sound is not outputted
After entering to the tone test mode (Refer
to 2-9. Tone test mode on the SECTION 3
TEST MODE on page 24), test signal is
outputted.
The sound is not outputted.
No
Yes
Check and repair the signal path for
being inputted to the DSP (IC2009) on
the MAIN board.
(DSP (IC2009) and digital power
amplifier (IC3001) on the MAIN board is
OK)
Yes
Check and repair the area surrounding
IC3002 on the MAIN board.
No
Check and repair the area surrounding
IC3001 on the MAIN board.
No
Yes
Yes
The “H” is inputted to the pin 37 (VALID) of
IC3002 on the MAIN board.
The PWM signal is inputted INPUT_D line
(pin 15), INPUT_C line (pin 14), INPUT_B
line (pin 6) and INPUT_A line (pin 5) of
IC3001 on the MAIN board.
Check that cable is properly connected to
the connector (CN3001, CN3002) on the
MAIN board.
3. Power is not turned on
Power is not turned on.
The voltage of the following is 28 V.
POWER board: CN902 pin 3 to 5
The voltage of the following is 12 to
17 V.
POWER board: CN902 pin 9
The voltage of the following is 3.3 V.
MAIN board: IC1002 pin 96, 97
Yes
POWER board is damaged.
Yes
Yes
Vibrator (X1001) on the MAIN board
is oscillated after AC input.
Yes
Fuse (F901, F931) on the POWER
board conduct the electricity.
No
No
No
Replace the IC1002 or vibrator (X1001) on
the MAIN board.
The reset signal is inputted to pin
10 of IC1002 on the MAIN board
after AC input.
Check and repair the area surrounding
IC1003 on the MAIN board.
Yes
Yes
No
Replace the IC1002 on the MAIN
board.
No
Replace the fuse (F901, F931) on the
POWER board.
No
Repair the capacitor (C1035), diode
(D1008) or IC1009 on the MAIN board.
The voltage of the following is about 15 V.
MAIN board: IC1009 pin 2
The voltage of the following is 4.0 V.
MAIN board: C1035 plus side
The voltage of the following is 3.3 V.
MAIN board: D1008 cathode side
