SONY MXDD40
Service Manual

MXD-D40

9. Press the [YES] button to display �EFB = MO-P�. Then, the optical pick-up moves to the pit area automatically and servo is imposed. 10. Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not turn the [ l AMS L] (MD) knob.
Traverse Waveform
A VC B Specified value : Below 10% offset value Offset value (%) = IA � BI X 100 2 (A + B)

11. Press the [YES] button to display �EF MO CHECK (C14)�. The disc stops rotating automatically. 12. Press the [ A EJECT] button and take out the disc. 13. Load the check disc (MD) TDYS-1. 14. Turn the [ l AMS L ] (MD) knob and display �EF CD CHECK� (C15). 15. Press the [YES] button to display �EFB = CD�. Servo is imposed automatically. 16. Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not turn the [l AMS L ] (MD) knob.
Traverse Waveform
A VC B Specified value : Below 10% offset value Offset value (%) = IA � BI X 100 2 (A + B)

6-7. Focus Bias Check Change the focus bias and check the focus tolerance amount. Checking Procedure: 1. Load the test disk (MDW-74/GA-1). 2. Turn the [ l AMS L ] (MD) knob to display �CPLAY2 MODE� (C36). 3. Press the [YES] button to display �CPLAY2MID�. 4. Press the [MENU/NO] button when �C = AD = � is displayed. 5. Turn the [ l AMS L ] (MD) knob to display �FBIAS CHECK� (C16). 6. Press the [YES] button to display � / c = �. The first four digits indicate the C1 error rate, the two digits after [/] indicate ADER, and the 2 digits after [c =] indicate the focus bias value. Check that the C1 error is below 20 and ADER is below 2. 7. Press the [YES] button to display � / b = �. Check that the C1 error is about 100 and ADER is below 2. 8. Press the [YES] button to display � / a = �. Check that the C1 error is about 100 and ADER is below 2. 9. Press the [MENU/NO] button, then press the [ A EJECT] button and take out the test disc. 6-8. C PLAY Check MO Error Rate Check Checking Procedure: 1. Load the test disk (MDW-74/GA-1). 2. Turn the [ l AMS L ] (MD) knob to display �CPLAY2 MODE� (C36). 3. Press the [YES] button to display �CPLAY2MID�. 4. The display changes to �C = AD = �. 5. If the C1 error rate is below 20, check that ADER is 00. 6. Press the [MENU/NO] button to stop playback, then press the [ A EJECT] button and take out the test disc. CD Error Rate Check Checking Procedure: 1. Load the check disc (MD) TDYS-1. 2. Turn the [ l AMS L ] (MD) knob to display �CPLAY2 MODE� (C36). 3. Press the [YES] button to display �CPLAY2MID�. 4. The display changes to �C = AD = �. 5. Check that the C1 error rate is below 20. 6. Press the [MENU/NO] button to stop playback, then press the [ A EJECT] button and take out the check disc. 6-9. Self-Recording/playback Check Prepare a continuous recording disc using the unit to be repaired and check the error rate. Checking Procedure: 1. Load a recordable disc (blank disc). 2. Turn the [ l AMS L ] (MD) knob to display �CREC 2MODE� (C37). 3. Press the [YES] button to display �CREC 2MID�. 4. When recording starts, lights up � REC � and display �CREC 2 @@@@� (@@@@ is the address). 5. About 1 minute later, press the [MENU/NO] button to stop continuous recording. 6. Turn the [ l AMS L ] (MD) knob to display �CPLAY2 MODE� (C36). 7. Press the [YES] button to display �CPLAY2MID�. 8. �C = AD = � will be displayed. 9. Check that the C1 error becomes below 20 and the AD error below 2. 10. Press the [MENU/NO] button to stop playback, then press the [ A EJECT] button and take out the disc.

17. Press the [YES] button to display �EF CD CHECK� (C15). 18. Press the [A EJECT] button and take out the check disc (MD) TDYS-1. Check Location: BD (MD) board (see page 44)

39