Sony mz 1 service manual

Page 1

MZ-I

SONY fi US Model
SERVICE MANUAL Canaaaa Maaa,
AEP Model

UK Model

_E Model

SUPPLEMENT-2 Tour/st Model

File this supplement with the service manual.

Subject : Supplied parts deleted
Change made to CORRECTION-1 adjustment

' : Indicates corrected portion

Page INCORRECT CORRECT

88 A-3250-204»A MD ASSY not supplied

74

\_._______./

\

Page 2

SECTION 5 ELECTRICAL ADJUSTMENTS (CORRECTION-1)
' 2 Indicates corrected portion

Page INCORRECT CORRECT
1-5. Adjustment of tracking error 1-5. Adjustment of tracking error
1-5-1. Up to last digit-12 of main board 1-5-1. Up to last digit-12 of main board
AF osc AF 050
m @- __ [5
i518? 3:81 iSlSi 3:2:
I__ |__.

1. Activate MO-PIT, EFM-CLV mode(Table 2 - b). Activate MO-PIT. EFM-CLV mode(Tab1e 2 - b).

2. Load an M0 disc and optical pickup moves to the most Load an M0 disc and optical pickup moves to the most
inside track, then press the PLAY key. inside track, then press the PLAY key.

3. Connect an oscilloscope to TPlOfi. and adjust RV504 Connect an oscilloscope to TP106, and adjust RV504
so that a waveform at TP106 is vertically so that a waveform at TP106 is vertically
symmetric(noise measures). symmetric(noise measures).

4. Press the STOP key and optical pickup moves to Press the STOP key and optical pickup moves to
middle track(Groove area). middle track(Groove area).

5. With MO-GRV, ADIP-GRV mode (Table 2 - d). With MO-GRV, ADlP-GRV mode (Table 2 - d).
press PLAY key for focusing. and press EDIT key to press PLAY key for focusing. and press EDIT key to

6 activate the write power mode( "LaserMOW" is activate the write power mode( LaserMOW" is
[CORRECTION-1]

displayed).
At this time, adjust RVSOI so that a waveform at TP106
is vertically symmetric against VC.

6. Repeat steps 1) to 3) for adjustment, then unload the
disc.

7. Activate CD-PI'I. EFM-CLV mode (Table 2 - a).
(Connect T9520 to GND with a jumper wire)

8. In the STOP status. adjust RV503 so that the voltage at
TPIOG is VCiSOmV.

9. Load a CD disc. and press PLAY key and adjust RV502

so that a waveform at TPl06 is vertically symmetried
against VC.

10. Remove a jumper wire between TP520 and GND,

10. Remove a jumper wire between TP520 and GND.

displayed).

At this time. adjust RVSOI so that a waveform at TPIOIS
is vertically symmetric against VC.

Repeat steps I to 5 once more, then press the EDIT key to
select the Read Power mode ( Laser MO" is displayed)
and confirm that the center offset from the waveform
adjusted in step 5 is within 0.3V. After confirmation.
unload the disc,

* If the center offset is over 0.3V, the OP is defective,
Activate CD-PIT. EFM-CLV mode (Table 2 - a).
(Connect TP520 to GND with a jumper wire)

In the STOP status, adjust RV503 so that the voltage at
TPI 06 is VC i SOmV.

Load a CD disc, and press PLAY key and adjust RV502
so that a waveform at TP106 is vertically symmetried

against VC.

9-957-535-87

Sony Corporation
General Audio Group

_2_

Enqfish

93618994

Printed in Japan

@1993]

Published by Audio Sector Quality Assurance Dept.