Electrical Adjustments - Sony MZ-N707 OpenMG Jukebox NOTES on installing & operating Service Manual

OUTLINE
• In this set, automatic adjustment of CD and MO can be per-
formed by entering the test mode.
However, before starting automatic adjustment, the memory
clear, power supply adjustment, and laser power check must be
performed in the manual mode.
• A key having no particular description in the text, indicates a
set key.
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
• SONY MO disc available on the market
• Digital voltmeter
• Laser power meter LPM-8001
• Thermometer (using the Temperature Correction)
3. Unless specified otherwise, supply DC 3V from the DC IN
3V jack (J601).
4. Switch position
HOLD switch ............................................... ON
ADJUSTMENT SEQUENCE
1. NV Reset (EEPROM clear)
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2. Power Supply Manual Adjustment
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3. Temperature Correction (item number: 015)
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4. Laser Power Check
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5. Electrical Offset Adjustment
Caution: This adjustment must be made with
no disc loaded.
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6. CD Overall Adjustment
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7. MO Overall Adjustment
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8. RESUME Clear
Note: If the version of the microcomputer is 1.000 or later, "3. Tempera-
ture Correction" and "2. Power Supply Manual Adjustment" can
be performed continuously in reverse order with pressing the
SEARCH]
key in the overall adjustment mode.
NV RESET
Caution: The shipment data will be cleared when the NV is reset.
Therefore, change the NV adjusted values following the
Change of NV Adjusted Values immediately after the
NV was reset.
Change the NV adjustment values according to the mi-
crocomputer version.
SECTION 5

ELECTRICAL ADJUSTMENTS

(Part No. : 4-963-646-01)
(Part No. : J-2501-046-A)
Manual Mode
Manual Mode
Manual Mode
Overall Mode
Manual Mode
[END
• Setting Method of NV Reset
1. Select the manual mode of the test mode, and set item number
021 NV Reset (see page 14).
Set LCD display
0 21
2. Press the X key.
Set LCD display
0 21
3. Press the key once more.
X
Set LCD display
0 21
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NV reset (after several seconds)
0 21
4. Press the / key to quit the manual mode, and return
x CHG
the test mode (display check mode).
• Change of NV Adjusted Values (Version 1.100)
Caution: Change the NV adjustment values according to the mi-
crocomputer version.
In this set, some adjusted values were set in the manual mode at
the shipment, but these will be cleared when the NV is reset.
Therefore, modify the NV adjusted values through the following
procedure immediately after the NV was reset.
1. Item numbers in which the NV adjusted values are to be modi-
fied
– Change ABCD gain [Hpit] initial value (item number 336)
Caution: The ABCD gain [Hpit] initial value must be
changed before the overall adjustment.
– Change BatFlg value (item number 741)
– Change NiRec0 to 4 values (item numbers 771 to 775)
– Change NiPb 0 to 4 values (item numbers 776 to 779, 781)
– Change CLV drive voltage limiter (item numbers 865, 866)
– Change x2 CLV speed gain, +6dB compared to conventional
(item numbers 867, 868)
– Change x2 CLV phase gain, +3dB compared to conventional
(item numbers 871, 872)
– Change x2/x1 switching temperature threshold value
(+10 C t +5 C) (item numbers 873, 874)
MZ-N707
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