TROUBLESHOOTING
Turn power on.
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NO |
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Check power supply circuit. |
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Is power on? |
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PN508 PIN 8, |
6.2V |
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PN508 PIN 7, |
5V |
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IC503 PIN 2, 3.3V |
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YES
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NO |
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NO |
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Does initial read work? |
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Check the DISK turns |
Check the connector |
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PN502, PN503, PN507 |
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YES |
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YES |
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YES |
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Check the Laser |
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YES |
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Check the focus circuit |
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YES |
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Check the TRAKING circuit |
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Does it play? |
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NO |
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Check the tracking servo circuit. |
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YES |
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Does it output audio? |
NO |
Check the PN508 PIN1, 3 |
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YES |
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OK |
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- 2-2 -
Fails to initial read
NO
Disc motor turns
YES
Does RF waveform appear?
NO
IC501 Pin4
Check the Voltage change of PN 507 pin2(OPEN, CLOSE)
YES
Check the Data transmission from
PN507 pin8 to CD DSP
5V
0V
YES
Check the Data transmission from PN507 pin6 to MICOM
5V
0V
YES
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Check the change of SLDO |
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2V |
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Voltage(IC501 pin23) |
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1V |
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0V |
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YES |
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YES |
Check the change of SL +, |
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1.2V |
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SL - Voltage |
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0V |
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(IC502 pin 18, 19) |
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0.8V |
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NO |
Defective connector |
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PN507 |
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NO |
Defective connector |
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PN507 Defective |
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MICOM |
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Defective connector |
NO |
PN507 Defective |
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IC501 |
NO |
Defective IC501 |
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NO |
Defective IC502 |
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YES |
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Defective contact PN503 |
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Defective PICK-UP |
Does laser light? |
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A |
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YES
Does FA+ waveform appear at
IC502 pin13?
focus coil drive wareform.
YES |
Does TE waveform appear at |
IC501 pin 15? |
TRACKING ERROR wareform |
YES |
Is rotation normal?
YES
Is there no dropout of RF signal?
B
NO
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Defective IC501 |
YES |
Defective PICK-UP |
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- 2-3 -
A |
Laser does not light. |
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Is “3.5V” applied to pin 80 of IC 501?
YES |
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NO |
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NO |
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NO |
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Did pickup return to |
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Is data transferred from |
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Defective MICOM. |
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innermost circular? |
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MICOM IC ? |
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YES |
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YES |
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Does voltage appear at IC |
NO |
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502 pin 18,19 ? |
Defective IC 501, 502 |
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YES |
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Defective slide motor and/or |
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connector. |
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Does it stop at inner pick |
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Is defect output from LM |
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circular after shift? |
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SW applied to pin 5 |
of |
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YES |
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PN503? |
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NO |
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Defective LMT SW and/or |
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connector. |
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OPEN |
CLOSE |
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YES |
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Defective MICOM. |
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YES |
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NO |
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Is power supplied to laser Q501? |
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Defective connector. |
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(Q 501 collector: about 1.8V) |
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R508»1.0V |
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YES |
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Defective Q 501 and/or laser. |
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YES |
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Does laser current flow? |
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YES |
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R508«1.0V |
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Defective laser and/or |
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1.0V across R508 |
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connector. |
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- 2-4 -
B |
Laser lights |
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NO |
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NO |
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Does lens move up/down? |
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Defective IC501 |
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Check the signal of |
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FOCUS SEARCH |
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YES |
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(IC501 Pin 21) |
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YES |
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NO |
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Defective IC502 |
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Chekc the signal of PN502 |
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pin 13, 14 |
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Open activator and/or connector |
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YES |
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Does FE signal appear? |
NO |
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(IC501 pin 13) |
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Defective IC501 |
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YES |
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NO |
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Does DRF signal appear? (IC 501 pin67) |
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Degraded laser diode |
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Defective PICK-UP |
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- 2-5 -