NAD L56
Instrukcja Serwisowa

B.
No disc

.Power on

Check loading Part.

Does tray open or close?

NO

Push Pick-up to inner track to the end by hand.

YES Does PMD03 Pin 7 change high to low? YES Pressing the open/close key repeatedly, check the voltage of IC2M1 Pins 13, 14 change 0V to 5V YES Does the voltage change at PMD04 Pins 1, 2 more than 2V on the basis of 3.8V? YES

NO

DECK assembly is defective. (Limit sw)

NO check µ-COM Part.

NO Replace IC2M1.

DECK assembly is defective. Fig.1. SLED Driver waveform

Does the pick-up slide inner or outer track? YES

NO

Check SLED Driver output. IC201 Pin 88 IC2M1 Pins 28, 29.

IC201 Pin 88 no output : IC201 is defective IC2M1 Pin 18 no output : IC2M1 is defective

Fig.2. Focus Driver waveform NO Check Focus Driver output. (IC201 Pin 83, IC2M1 Pins 37, 38) IC201 Pin 83 no output : IC201 is defective IC2M1 Pins 1, 2 no output : IC2M1 is defective

Does the pick-up lens move up and down? YES Slide the pick-up to inner track.

END

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