Technics SL-PJ33 - Page 14

SL-PJ33
@ MEASUREMENTS AND ADJUSTMENTS
Caution:
@ It is very dangerous to look at or touch the laser beam. (Laser radiation is invisible.) With the unit turned ‘‘on”,
laser radiation is emitted from the pick-up lens. Be careful during adjustments in particular.
@ The adjustment of this unit is basically the same as for SL-PJ11. (The adjusting points are partially different.)
For the detail, refer to SL-PJ11 Service Manual (Order No. HAD8509261G0).
ADJUSTMENT POINTS
e Servo P.C.B.
Short-connector
[] CN104 CN105 +5
CN101
* Remove the
rubber cover | yRioy C]
or oo A Best eye - -N- i
: vRi02
Tracking
gain
VR103
Tracking
offset
VR104
Focus
Note: gain
Is not needed arubber VRIO5
cover after servicing.
Focus
offset
e Main P.C.B.
PLL adjustment
connection point
a =
i RF Adjuster power
TJ701 connection point
ey
CN701
GND
Digital P.C.B.
Adjuster power
connection point
CN202
| cN201
|
CN401_ CN402 CN403 CN404
| ELECTRICAL ADJUSTMENT |
Equipment used
@ Servo gain adjuster (SZZP1017F)
® Conversion connector (SZZP1032F)
@ Two-channel oscilloscope (with trigger) of 30 MHz or over.
Adjustment Procedure
Step 1: | Remove the cabinet.
Vv
Step 2: Connect the servo
gain adjuster.
Vv
Step 3: Temporary setting
of each VR.
Vv
Step 4: Focus gain adjustment
Vv
Step 5: = Tracking gain
adjustment.
[7
Servo Gain Adjuster and Its Connection
@ Low frequency oscillator
@ Test disc (SZZP1014F). . .
® Ordinary disc
Refer to page 23
vA
Step 6: Best eye (PD balance)
adjustment
Vv
Step 7: Focus offset
adjustment
Vv
Step 8: Tracking offset
adjustment
Vv
Step 9: PLL adjustment
Vv
Step 10: Check of operation
after adjustment
Low frequency oscillator
OO09O9d
Servo gain adjuster
(SZZP1017F) GND OSC
@ ON/OFF switch ©
G2) ON GND ©
Selector \
osc ©
Oscilloscope Oscilloscope
connection
we] OO .
© terminals
O~O]| TP2 TP3 TPI
CHt
Oscillator connection
terminals
Conversion connector
(SZZP1032F)
To CN105
(Servo P.C.B.)
—12V GND +12V
(Chassis)