Kenwood RD-M52MD Service Manual page 9

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7-7 EF Balance(Traverse Adjustment)
Connection :
X33
ADJUSTMENT
TE1
VC
1. Recordable Disc
No. Key
1
2 Volume/
multi-control
3
4 PLAY
5 PLAY
6 Volume/
multi-control
7 PLAY
8 Volume/
multi-control
9 PLAY
PLAY
10 Volume/
multi-control
11 PLAY
12 EJECT
2. Pre Master Test Disc(TGYS-1)
No. Key
1
2 PLAY
3 Volume/
multi-control
4
5 EJECT
During this adjustment, the oscilloscope changes in units
of about 2%. Adjust so that the waveform comes nearest
to the specified value. (MO groove read power traverse
adjustment)
(Traverse waveform)
Specification : A = B
Notes :
1. Data is erased during MO write when a recorded disc is
used for this adjustment.
2. If the traverse waveform is difficult to be monitored, con-
nect an oscilloscope as shown in the figure below.
(TE1)
(VC)
CIRCUIT DESCRIPTION
Oscilloscope
+
-
V: 0.5V/div H: 10ms/div
INPUT: DC mode
Display/Function
Connect the oscilloscope to TE1 and VC in X33 pcb
Select [EFBAL ADJU]
Load the recordable disc
[EFBAL MO-W]
[EF=$ MOW]
Write power adjustment. Adjust the waveform as follows.
Display shows [EF=$ MOR] after [EFB=
to save the data in E2PROM.
Mode changes write to read
Focus and disc servo are on. Tracking servo off.
Read power adjustment. Adjust the waveform as follows.
Save the data in E2PROM.
Display shows [EFBAL MO-P]
Display shows [EF=$ MOP]
(Pickup travels to search pits and tune the servo to on.)
Adjust the waveform as follows.
Display shows[EFB= xSAVE]
to save the data in E2PROM.
Display shows [EFBAL CD] disc motor stops.
Unload disc.
Display/Function
Load the disc(TGYS-1).
[EF=$ CD] servo is on
Adjust the waveform as follows.
Save the data in E2PROM.
Display shows[EFB= xSAVE] in brief time.
[EFBAL ADJU]
Unload disc.
Oscilloscope
330kΩ
+
-
10pF
Digitized in Heiloo the Netherlands
RD-M52MD/M72MD
7-8 Focus Bias Adjustment
Use the special disc(continuous recorded disc)
No. Key
1 Volume/multi-control Select [FBIAS ADJU]
2
3 PLAY
4 Volume/multi-control Adjust "yyyy" to 220
5 PLAY
6 Volume/multi-control Adjust "yyyy" to 220
7 PLAY
8 PLAY
* Notes :
1. The relation between the C1 error and focus bias value
is shown in the figure below. Points "a" and "b" in the
figure are detected by the above adjustment. Focal
position "C" is automatically obtained from points "a"
xSAVE]
and "b" by calculation.
2. The C1 error rate fluctuates. Therefore, perform the
adjustment according to the observed mean value.
C1 error
7-9 Error Rate Check
No. Key
1. CD Error Rate
1 Volume/
multi-control
2
3 PLAY
4 STOP
5 EJECT
2. MO Error Rate
No. Key
1 Volume/
multi-control
2
3 PLAY
4 STOP
5 EJECT
Display/Function
Load the disc.
[a=xx yyyy/] point a
(xx=focus bias, yyyy=C1error)
[b=xx yyyy/] point b
[xx yyyy/] point c
Check "yyyy" within 50
Display shows [aa bb cc(xx)] focus bias adjust
(aa= point a,bb=b,cc=c )
Focus bias value
Display/Function
[CPLAY MODE]
Load the test disc(TGYS-1)
Display shows [CPLAY MID]
Access end
[c=xxxx a=yy] xxxx=C1 error (lower 20) yy=AIDP error
[CPLAY MODE]
Unload disc.
Display/Function
[CPLAY MODE]
Load the recordable disc
Display shows [CPLAY MID]
Access end
[c=xxxx a=yy] xxxx=C1 error (lower 50) yy=AIDP error(00)
[CPLAY MODE]
Unload disc.
1/20/2020
9
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