Electrical Adjustments - Sony MZ-B50 Service Manual

[Outline]
• In this set, automatic adjustment of CD and MO can be per-
formed by entering the test mode. (See page 10)
However, before starting automatic adjustment, the memory
clear, power adjustment and temperature adjustment must be
performed in the manual mode.
• The keys in the description refer to the keys on both set and
remote commander unless otherwise specified.
Though LCD display shows the LCD of the remote commander,
same contents are also displayed on the LCD of the set.
[Precautions for Adjustment]
1. Adjustment must be done in the test mode only.
After adjusting, release the test mode.
2. Use the following tools and measuring instruments.
• Test CD disc TDYS-1
Available SONY CD disc
• Recorded MO disc PTDM-1
Available SONY MO disc (recorded)
• Laser power meter LPM-8001
• Digital voltmeter
3. Unless specified otherwise, supply DC 3V from the DC IN 3V
jack.
4. Switch position
HOLD switch ................ OFF
[Adjustment Sequence]
Adjustment must be done with the following steps.
1. NV Reset (Memory clear)
r
2. Power Supply Manual Adjustment
r
3. Temperature correction
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4. CD Overall Adjustment
r
5. MO Overall Adjustment
SECTION 5

ELECTRICAL ADJUSTMENTS

(Part No. : 4-963-646-01)
(Part No. : J-2501-054-A)
(Part No. : J-2501-046-A)




Manual Mode






Overall Mode


[NV Reset]
• Setting method of NV reset
1. Select the manual mode of test mode, and set mode num-
ber 021NV Reset.
LCD display
R e s N V
2. Press the X key.
LCD display
R e s O K ?
3. Press the X key once more.
LCD display
R e s * * *
r NV reset (after several seconds)
R e s e t !
4. Quit the manual mode, and activate the test mode.
[Power Supply Manual Adjustment]
• Adjustment sequence
Adjustment must be done with the following steps.
1. VC PWM Duty (L) adjustment (mode number: 762)
r
2. VREM PWM Duty (H) adjustment (mode number: 763)
r
3. VREM PWM Duty (L) adjsutment (mode number: 764)
r
4. VC PWM Duty (H) adjustment (mode number: 765)
r
5. VREM PWM Duty (H) adjustment (mode number: 766)
r
6. VREM PWM Duty (L) adjustment (mode number: 767)
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