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Adjustment - Kenwood HM-531MD Service Manual

Kenwood micro hi-fi component system service manual
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• Test Mode
1. AUTO pre-adjustment mode
• Automatic pre-adjustment is performed. (After adjustment the grating adjustment mode is set.)
• The adjustment value is output with the aid of system controller interface.
2. AUTO adjustment mode
• Automatic adjustment is performed.
• The adjustment value is output with the aid of system controller interface.
• Continuous playback is performed. (Error rate indication, jump test)
3. RESULT sub-mode*
• The measurement value, set value and calculated value are indicated.
• The set value is changed manually (in servo OFF state).
4. RESULT mode (final adjustment)*
• The set value (after calculation) is indicated.
• The set value is changed manually (in servo OFF state).
5. MANUAL pre-adjustment mode*
• RF side manual adjustment is performed.
• Focus and tracking signal ATT manual adjustment is performed.
• Focus and tracking signal offset setting is performed.
6. MANUAL adjustment mode*
• Focus
and tracking signal ATT manual adjustment is performed.
7. EEPROM setting mode*
• Don't adjust.
8. TEST-PLAY mode*
• Continuous playback from the specified address is performed.
• C1 error rate measurement,
9. TEST-REC mode*
• Continuous recording from the specified address is performed.
• Change of record laser output (servo gain is also changed according to laser output)
10. EJECT mode*
• TEMP setting (of EEPROM setting)
* This mode is not used for service.
1. AUTO pre-adjustment mode (Low reflection disc only)
Step No.
Setting Method
Step 1
Test mode STOP state
Step 2
Press once the MD REC button.
AUTO pre-adjustment menu
Step 3
Press once the MD PLAY button. The slide moves to the innermost periphery, and automatic
pre-adjustment is started.
• During automatic adjustment
HAo RFg SAg SBg PTG PCH GTG GCH RCG
SEG RFG SAG HAO HEO TCO LAO
End of adjustment
If adjustment is OK, Step 4.
If adjustment is NG, Step 5.
Step 4
Grating adjustment,
adjustment value output
Press once the MD STOP button. STEP 2
Step 5
Adjustment value output
Press once the MD STOP button. STEP 2 AUTO pre-adjustment menu
: Adjustment name,
: Address
2. AUTO adjustment mode
Step No.
Setting Method
Step 1
Test mode STOP state
Step 2
Press the MD REC button two times. AUTO adjustment menu
Step 3
Press once the MD PLAY button. The slide moves to the innermost periphery, and automatic
adjustment is started.
• In case of high reflection disc
PEG HAG
•In case of low reflection disc
PEG LAG GCG GEG LAG
End of adjustment
If adjustment is OK, Step 4.
If adjustment is NG, Step 7.
Step 4
Adjustment value output
Press the MD PLAY button.
STEP 5
Press the MD STOP button.
STEP 2
Remarks
Display
[ t s m
e
]
[
A U T O
]
[
: _ _ _ _ _ _ ]
changes as follows.
[ _ C O M P L E T E _ ]
[
A U T
Y O B I
]
Remarks
Display
[ t s m
e
]
[ A U T O _ A J S T _ ]
[
: _ _ _ _ _ _ ]
changes as follows.
changes as follows.
[ _ C O M P L E T E _ ]
Step No.
Setting Method
Step 5
Continuous playback (groove section)
Step 6
Press the MD STOP button.
STEP 2 AUTO adjustment menu
Step 7
Adjustment value output
Press the MD STOP button.
STEP 2 AUTO adjustment menu
: Adjustment name,
: Measurement value,
Mechanism Adjustment
1. Optical pickup grating inspecting method
OSILLOSCOPE
a
43 pin of IC 1101
GND
100K
26 pin of IC 1101
EOUT
470p
GND CH1 CH2
470p
b
X
Y
25 pin of IC 1101
FOUT
100K
LISSAJOUS'S WAVEFORM
Less thana:b = 3:1
Figure 1-1 Optical Pickup Grating Deviation
Measuring Method
After the automatic adjustment is performed in the AUTO
mode (test mode) with the aid of high refection MD disc
("COMPLATE" is displayed), the Lissajous's waveform (x-y) is
adjusted.
1. Slightly loosen the 3 screws of spindle moto, and maken an
adjustment, observing the Lissajous's waveform.
2. After adjustment tighten the screw in arder of 1 , 2 , 3 .
2. Jitter adjustment and checking method
jitter Meter
3pin of IC 1201
(TP1274)
EFMMON
13 pin of IC 1201 (TP1275)
GND
Figure 1-3 Jitter connection diagram
After performing automatic adjustment in AUTO mode of
TEST mode using the low reflection MD disc, check this jitter
in pit continuous playback and groove continuous playback
mode.
Remarks
Display
[ a
c
[ C a n ' t _ A D J . ]
: Address
1
3
2
Spindle Motor
Adjusting hole
3
Spindle motor
1
Check the Lissajou's waveform,
shifting the mounting position with
a screwdriver (to be fitted into the
disc motor adjusting hole).
adjusting
hole
2
Figure 1-2
]

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