HT-CT380/CT381
27
SECTION 4
TROUBLESHOOTING
1. “PRTECT” is displayed on the
fl
uorescent indicator tube after turning the power on
“PRTECT” is displayed on the
fluorescent indicator tube after
turning the power on.
Yes
“PRTECT” is not displayed on the
fluorescent indicator tube, when
removing the speaker (SP1, SP2)
and turning the power on.
No
Replace the IC3001 on the MAIN board.
IC3001 on the MAIN board is
burned out.
Yes
Yes
Check and replace the speaker (SP1,
SP2) and connection cable (SPC1, SPC2).
The voltage of the following is 3.3 V.
MAIN board: IC1002 pin 18
The voltage of the following is 3.3 V.
MAIN board: IC1002 pin 74
No
The voltage of the following is 12 V.
MAIN board: IC3003 pin 4
No
Yes
Replace the IC1002 on the MAIN board.
Yes
No
No
No
No
OUT_D line (pin 27, 28), OUT_C line
(pin 32), OUT_B line (pin 35) and OUT_A
line (pin 39, 40) of IC3001 on the MAIN
board do not short-circuits or opens.
Replace the IC3001 on the MAIN board.
Yes
Replace the IC3001 on the MAIN board.
Yes
Yes
Mounted parts on the OUT_D line (pin 27,
28), OUT_C line (pin 32), OUT_B line (pin
35) and OUT_A line (pin 39, 40) of IC3001
on the MAIN board short-circuits or opens.
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.
Repair the short-circuit and opening of
mount parts.
Yes
Check and repair the area
surrounding IC3003 on the MAIN
board.
Check and repair the area surrounding
IC3002 on the MAIN board.
