18
MZ-N420D
3. Press the
ENTER/
NX
key once more.
4. Press the
x
/CANCEL
key to quit the manual mode, and
return to the test mode (display check mode).
Temparature Correction
• Adjustment Method of Temperature Correction
1. Select the manual mode of the test mode, and set the item num-
ber 015 (see page 14).
2. Measure the ambient temperature.
3. Adjust with
[]
or
[VOLUME --]
key so that the ad-
justed value (hexadecimal value) becomes the ambient tem-
perature.
(Initial value : 19h = 25˚C, Adjusting range : 80h to 7fh
(–128˚C to +127˚C))
4. Press the
ENTER/
NX
key to write the adjusted value.
Power Supply Manual Adjustment
• Adjustment sequence
Adjustment must be done with the following steps.
1. VC1_LOW (PB) adjustment (item number : 741)
2. VC1_HIGH (REC) adjustment (item number : 742)
3. VC2_LOW adjustment (item number : 743)
4. VC2_HIGH adjustment (item number : 744)
5. REG1 adjustment (item number : 745)
6. REG3_LOW1 adjustment (item number : 747)
7. REG3_LOW2 adjustment (item number : 748)
8. REG3_HIGH adjustment (item number : 749)
9. VREC_LOW (X2 speed) adjustment (item number : 751)
10. VREC_MIDDLE (X4 speed)adjustment (item number : 752)
11. VREC_HIGH (HEAD MOTOR) adjustment (item number : 753)
• Setting Method of Power Supply Manual Adjustment
1. Make sure that the power supply voltage is 1.5V.
2. Select the manual mode of the test mode (see page 14).
3. Set item number.
Note:
Power supply adjustment auto item feed mode (page 23) is
available to perform the temperature Correction and Power
Supply Adjustment without entering the manual mode.
NV Reset
• Setting Method of NV Reset
1. Select the manual mode of the test mode, and set item number
021 NV Reset (see page 14).
2. Press the
ENTER/
NX
key.
SECTION 5
ELECTRICAL ADJUSTMENTS
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.
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
(Part No. : 4-963-646-01)
• SONY MO disc available on the market
• Digital voltmeter
• Laser power meter
LPM-8001
(Part No. : J-2501-046-A)
• Thermometer (using the Temperature Correction)
• Personal computer
• USB cable
3. Unless specified otherwise, supply DC 1.5V from battery ter-
minals.
4. Switch position
HOLD
.
switch ..................................... ON
Adjustment Sequence
1. NV Reset (item number: 021)
(EEPROM clear)
r
2. Temperature Correction (item number: 015)
r
Manual Mode
3. Power Supply Manual Adjustment
r
4. Laser Power Check
r
5. CD Overall Adjustment (item number: 031)
r
6. MO Overall Adjustment (item number: 034)
r
7. RESUME Clear (item number 043)
r
8. Rewriting the Patch Data
(at replacement of the MAIN board)
r
9. Rewriting the NV values
Set LCD display
# # # S C C
021
Set LCD display
R e s O K ?
021
NV reset (after several seconds)
Set LCD display
R e s * * *
021
R e s e t !
021
Set LCD display
**
: Adjusted value
# # # S * *
015
Manual Mode
Overall Mode
