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TROUBLE SHOOTING
1. Turn on the power switch, if the power indicator on the front cabinet is not light, no display on the display screen, no LOGO for video output, and the unit does not work: a. b. Check whether the power cable connected properly. Check whether the AC voltage on the power board correct or not. If not correct, check the fuse and the connector XS1 and XS2 of the power input end. c. Check the voltage of every output socket of the power board. XP1.1 +5V XP1.3 +5V XP1.5 +12V XP1.7 -12V If there is no output at all, then should check V2 first, then check the photo-coupler (U2) and rectifier (D1~D4) in turn. d. When no +5V output, check D14, W1, V1 and U2. When there is +5V output but no +12V output, then check D13; no �12V output, then check D9 and U3; no -24V output, then check D8; no +3.5V output, then check D7. 2. No Karaoke: a. b. 3. Check whether the 12V of connection socket between OK board and decode board proper. Check PT2399, LM4558 and 2VD1. XP2.1 +5V XP2.3 +5V XP2.5 +12V XP3.1 +5V XP3.5 -24V XP3.3 +3.5V
If the power indicator is light, but the unit does not work: a. b. Check the power board (refer to No.1 item). Check the power voltage of decode board: J1.1 +5V J1.3 +5V c. J1.5 +12V J1.7 -12V
Check the power voltage of U1, U2 and U3 to be +3.3V or not. Check U5, U11 and U12 to see if their power voltage is +5V, and if U5 connected properly.
d.
Regarding to the LOGO of video output: If there is no LOGO, check as (e) item. Otherwise, check as (i) item.
e.
Regarding to the display of the display screen on the front cabinet: If abnormal, check as (f) item. Otherwise, check as (h) item.
f. g.
Check if U1 has reset signal. Check whether there is signal of 27MHz crystalline vibration: If there is no signal, then check U1 and U9. Otherwise, check U5 and U6.
h. i.
Check U7, U12, U13 and U14. Check whether the display on the display screen of the front cabinet normal: If abnormal, check follows (j) item. Otherwise, check the deck.
j. k. l.
Check if the ATAPI socket is connected to the deck properly. Check the components around the ATAPI socket. If the unit can play normally but the display is not proper or no display, the buttons on the front cabinet do not work but the remote controller can operate, then check the IC (UPD16312) of the front cabinet.
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