Electrical Adjustments; Precautions For Adjustment; Laser Power Check - Sony MZ-R55 Service Manual

PRECAUTIONS FOR ADJUSTMENT

1) Perform all adjustments in the or
After adjusting, exit the test mode
2) Use the f ollo wing tools and measuring instruments.
• Test CD TDYS-1
• Recorded MO disk PTDM-1
• Laser po wer meter LPM-8001
• Oscilloscope (Frequenc
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 :
Optical pick-up
objective lens
MAIN board
AP5117 (VCC)
AP574 (LDI0)
Adjustment Method :
1. Set the ser vo mode of the test mode (Mode :
( ke y, and set the laser po
2. Press the
(Mode : 020) using the VOLUME + or – ke y.
3. Press the =
ke y and mo ve the optical pic
most circumference.
4. Open the co ver and set the laser po
lens of the optical pick-up.
( ke y, and set the laser CD/MO read adjustment
5. Press the
mode (Mode : 021).
6. Chec k that the laser po wer meter reading is 0.85
7. Chec k that the v olta ge between AP5117 (VCC) and AP574
(LDI0) at this time is belo
( ke y, and set the laser MO write adjustment
8. Press the
mode (Mode : 022).
9. Chec k that the laser po wer meter reading is 6.8
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
12. Press the p ke y.
13. Exit the test mode.
Adjustment Location : See page 19.

ELECTRICAL ADJUSTMENTS

der given in the test mode
.
(Par t No. : 4-963-646-01)
(Par t No. : J-2501-054-A)
(Par t No. : J-2501-046-A)
y band abo ve 40 MHz. Perf orm the
laser
power meter
digital voltmeter
000).
wer adjustment mode
k-up to the inner
wer meter on the objective
± 0.085 mW .
w 44 mV .
± 0.68 mW .
w 80 mV .
SECTION 5
MO TRAVERSE ADJUSTMENT
. Connection :
MAIN board
TP5980 (TE)
AP5430 (VC)
Adjustment Method :
1. Set the ser vo mode of the test mode (Mode :
( ke y, and set the MO test adjustment mode (Mode
2. Press the
: 030) using the
=
3. Press the
the center circumference.
4. Inser t an y MO disk a vailab le on the market.
5. When the ( ke y is pressed,
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,
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,
that the traverse waveform is symmetrical at the top and bottom.
(Traverse waveform)
0 V
9. Chec k that the tra ver se le vel at this time is abo
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.
– 17 –
oscilloscope
VOLUME + or – ke y.
or + ke y and mo ve the optical pic
the MO read FE balance adjust-
Specification : A = B, C
000).
k-up to
and c hec k
and c hec k
A
C
B
> =
1.0 Vp-p
ve 1.0 Vp-p.