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CD-4900M/DPF-J9030
No.
ITEM
1. With pressing the REPEAT KEY, turn the power on to enter the test mode.
2. Set the Test disc to Disc NO. 1.
3. Close the door.
FOCUS ERROR
1
BIAS
LASER CURRENT
2
CHECK
Note:
Type 4 disc :SONY YEDS-18 Test Disc or equivalent.
LPF : Around 47kΩ + 390 pF or so.
FIG. (d)
8
ADJUSTMENT
INPUT
OUTPUT
SETTING
SETTING
Connect an oscillo-
Test disc
scope as follows.
Type4
CH1:RF(X25, CN2-1
/KTD-02
X32, CN2-1)
Connect the DC volt-
meter between Q1(E)
Test disc
Type4
and VCC(CN1, 15pin)
on X25 and X32.
RF signal
PLAYER
ALIGNMENT
SETTING
POINT
Press the PLAY
FE BIAS
/PAUSE key .
VR1
Confirm that the
(X25, X32)
display is "05".
Press the PLAY
/PAUSE key .
–
Confirm that the
display is 03 or 05.
RF signal in test mode (PLAY).
Perform the tangential and focusing offset are focused into
one point on the display. The crossing points above and
below the center shall also be looked clearly. (FE BIAS)
ALIGN FOR
FIG.
Optimum eye
(d)
pattern
0.5±0.2V
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