15
RXD-M32
ADJUSTMENT
(d)
(a) Laser Power
Pickup
0.05~0.15 mW
Optical power meter
¶
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.
No.
1
3
ITEM
✽
LASER
POWER
FOCUS
ERROR
BIAS
INPUT
SETTING
–
Test disc
Type 4
OUTPUT
SETTING
Connect an oscillo-
scope as follows.
CH1: RF(CN3,
1
)
GND : VC(CN3,
2
)
✽
X32
Set the senor section
of the optical power
meter on the pickup
lens.
PLAYER
SETTING
Press the "PLAY" key
to check that the dis-
play is "03".
Press the "PLAY"
key. Confirm that the
display is "05".
ALIGNMENT
POINT
VR 1
–
ALIGN FOR
On the power
from.0.05 to 0.15mW.
when the diffraction
grating is correctly
aligned with the RF
level of 0.8Vp-p or
more
Optimum eye pattern
FIG.
(a)
2
LASER
CURRENT
Test disc
Type 4
Connect the DC volt-
meter to CN3 (
3
,
4
)
on X32.
Press the "PLAY" key
to check that the dis-
play is "03" or "05"
–
220mV to 550mV
(d)
Note:
Type 4disc :SONY YEDS-18 Test Disc or equivalent. (KTD-02)
LPF : Around 47k
Ω
+ 390pF or so.
✽
How To Check the Laser Power
1. Set the test mode.
(The CD tray is opened automatically.)
2. To close the CD tray, press the OPEN/CLOSE key.
3. Move the pickup to outward by pressing the TAPE REC key.
CD player adjustment
TEST MODE: While pressing the CD PLAY key, turn the power on.
RF signal: AC coupled
R
