Sony MZ-R55, Service Manual

Page: 17 / 129

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SECTION 5
ELECTRICAL ADJUSTMENTS
PRECAUTIONS FOR ADJUSTMENT
1) Perform all adjustments in the or der given in the test mode .
After adjusting, exit the test mode .
2) Use the f ollo wing tools and measuring instruments.
• Test CD TDYS-1
(Par t No. : 4-963-646-01)
• Recorded MO disk PTDM-1
(Par t No. : J-2501-054-A)
• Laser po wer meter LPM-8001
(Par t No. : J-2501-046-A)
• Oscilloscope (Frequenc y band abo ve 40 MHz. Perf orm the
calibration of pr obe fir st bef ore measuring.)
• Digital v oltmeter
3) Unless specified othe wise , suppl y DC 3V fr om the DC IN 3V
jack.
4) Swtich, knob positions
HOLD switch ............. OFF
AVLS s witc h .............. NORM
LASER POWER CHECK
Connection :
Adjustment Method :
1.
Set the ser vo mode of the test mode (Mode : 000).
2. Press the
(
ke y, and set the laser po wer adjustment mode
(Mode : 020) using the VOLUME + or – ke y.
3. Press the
=
ke y and mo ve the optical pic k-up to the inner
most circumference.
4. Open the co ver and set the laser po wer meter on the objective
lens of the optical pick-up.
5. Press the
(
ke y, and set the laser CD/MO read adjustment
mode (Mode : 021).
6. Chec k that the laser po wer meter reading is 0.85
±
0.085 mW .
7. Chec k that the v olta ge between AP5117 (VCC) and AP574
(LDI0) at this time is belo
w 44 mV .
8. Press the
(
ke y, and set the laser MO write adjustment
mode (Mode : 022).
9. Chec k that the laser po wer meter reading is 6.8
±
0.68 mW .
10. Press the
P
ke y to finaliz e the adjustment data.
11. Chec k that the v olta ge between AP5117 (VCC) and AP574
(LDI0) at this time is belo w 80 mV .
12. Press the
p
ke y.
13. Exit the test mode.
Adjustment Location : See page 19.
MO TRAVERSE ADJUSTMENT
Connection :
Adjustment Method :
1.
Set the ser vo mode of the test mode (Mode : 000).
2. Press the
(
ke y, and set the MO test adjustment mode (Mode
: 030) using the VOLUME + or – ke y.
3. Press the
=
or
+
ke y and mo ve the optical pic k-up to
the center circumference.
4. Inser t an y MO disk a vailab le on the market.
5. When the
(
ke y is pressed, the MO read FE balance adjust-
ment mode (Mode : 032) will be set after MO focus search
adjustment mode (Mode : 031).
6. Press the
P
ke y to perf orm automatic adjustment, and c hec k
that the traverse waveform is symmetrical at the top and bottom.
7. Slide the REC ke y and set the MO write FE balance adjust
ment mode (Mode : 034).
8. Press the
P
ke y to perf orm automatic adjustment, and c hec k
that the traverse waveform is symmetrical at the top and bottom.
9. Chec k that the tra ver se le vel at this time is abo ve 1.0 Vp-p.
10. Press the
p
ke y.
11. Exit the test mode.
Note)
Using a recorded disk in this adjustment will erase the data.
Adjustment Location : See page 19.
digital voltmeter
MAIN board
AP5117 (VCC)
AP574 (LDI0)
laser
power meter
Optical pick-up
objective lens
oscilloscope
MAIN board
TP5980 (TE)
AP5430 (VC)
A
B
C
Specification : A = B, C 1.0 Vp-p
0 V
(Traverse waveform)
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=