1050MD/DM-5090(K) COVER 97.11.28 2:26 AM y[W 26
1050MD/DM-5090/DM-9090
CIRCUIT DESCRIPTION
(Traverse waveform)2. The C1 error rate fluctuates. Therefore, perform the
adjustment according to the observed mean value.
C1 error
Specification : A = B
16.Press the ENTER key to display OEFB=##XSAVE�
momentarily and save the adjustment result in non-
volatile memory. After that, OEFBAL ADJUST� is dis-
played.
Focus bias value
17.Press the EJECT key to take out test disc TGYS-1.
Notes :5-8 Error rate confirmation
1. Data is erased during MO write when a recorded disc is5-8-1 CD error rate confirmation
used for this adjustment.Confirmation :
2. If the traverse waveform is difficult to be monitored, con-1. Insert test disc TGYS-1.
nect an oscilloscope as shown in the figure below.2. Turn the JOG DIAL to display OCPLAY MODE�.
3. Press the ENTER key to display OCPLAY MID�.
Oscilloscope
4. OC=#### a=##� is displayed.
5. Confirm that the C1 error rate is less than 20.
330k16. Press the DELETE key to stop the playback, than press
the EJECT key to take out a test disc.(TE2)+
10pF-
(VC)5-8-2 MO error rate confirmation
1. Insert a continuously recorded disc ( refer to 5-4, "Creat-
5-7 Focus bias adjustment
ing the recordable continuous recording disc")Connection :
1. Insert a continuously recorded disc (refer to 5-4, OCreat-2. Turn the JOG DIAL to display OCPLAY MODE�.
3. Press the ENTER key to display OCPLAY MID�.ing the recordable continuous recording disc�).
4. OC=#### a=##� is displayed.
2. Turn the JOG DIAL to display OCPLAY MODE�.
3. Press the ENTER key to display OCPLAY MID�.5. Confirm that the C1 error rate is less than 50 and that
ADIP error rate is 00.
4. Press the DELETE key when "C=#### a=##" is dis-
6. Press the DELETE key to stop the playback, then pressplayed.
5. Turn the JOG DIAL to display OFBIAS ADJUST�.the EJECT key to take out a test disc.
Note :The "#" display on the screen indicates an arbitrary 6. Press the ENTER key to display Oa=## ####/##�. The
figure.
middle four-digit figure indicates the C1 error rate, the
two-digit figure after O/##indicates ADIP error� , and the
two-digit figure after Oa=� indicates the focus bias value.
7. Turn the JOG DIAL clockwise and detect the focus bias
value in which the C1 error rate becomes 220.
8. Press the ENTER key to display Ob=## ####/##�.
9. Turn the JOG DIAL counterclockwise and detect the
focus bias value in which the C1 error rate becomes
220.
10.Press the ENTER key to display OC=## ####/##�.
11.Confirm that the C1 error rate at that time is less than
50, then press the ENTER key.
12.The display appears "##-##-##(##)" momentarily and
save the adjustment result in nonvolatile memory. After
that "FBIAS ADJUST" is displayed.
13.Press the EJECT key to take out a continuous recording
disc.
Notes :
1. The relation between the C1 error and focus bias value
is shown in the figure below. Points Oa� and Ob� in the
figure are detected by the above adjustment. Focal
position OC� is automatically obtained from points Oa� and
Ob� by calculation.
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ACEC
KENWOOD
