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to check the operation of the signal. If the

signal is missing or improper, the main board

is most likely at fault.

4. Play a CD and check the tracking error signal

at TP507

5. Check for a focus or tracking problem at pins

1, 2, 3, and 4 of CN501. These are the focus

and tracking drive signals going to the laser

slide assembly. You should see an ac signal

riding on about 4 volts dc.

6. If the drive signals are being loaded down,

remove power from the player and unplug the

flex cable to CN501.

7. Plug the player in and turn on the power

while monitoring pin 1 of CN501. The drive

signal rises to 4 volts dc if it's good. This

also applies to the other drive signals on pins

2, 3, and 4.

8. For DVD tracking problems check the track-

ing error signals going to the main board on

pins 12, 13, 14, and 15 of CN501.

9. For CD tracking problems check the tracking

error signals going to the main board on pins

ten and eleven of CN501.

10. If the focus coil does not move up and down

or the laser does not come on, check for plus

5 volts on pin 19 of CN501 and plus 2 volts

on pin 20 of CN501.

11. If the voltages are missing or improper,

unplug the flex cable and measure them

unloaded.

12. For problems associated with the feed motor

or the spindle motor check the signals on

connector CN502.

13. Check the feed motor drive signals at pins 1

and 2 of CN502. They are easiest to see

when the power is cycled on and the player is

put in the times 8 scan speed.

14. These signals can also be checked unloaded;

however, the drive signal goes to 4 volts DC

when AC is applied and power is turned on.

If the dc signal is present, the drive signal

from the main board is good.

15. To check the feedback from the feed motor

hall switches, monitor pins 5, 6, 7, and 8 of

CN502 while cycling power and playing a

disc in times 8 scan.

16. If a disc won't play you can still check the

hall switches, turn the power off and push the

slide away from the spindle motor. Then turn

the power on and monitor the signals as the

slide moves back to its default position.

17. The dc drive voltage for the feed motor hall

switches is monitored at pin 3.

18. The spindle motor drive signals are checked

at pins 17, 18, and 19. They are easiest to see

when the power is cycled on and the player is

put in the times 8 scan speed.

19. These signals can also be checked unloaded;

however, you can only see a momentary