Technics SL-P111 - Electrical Adjustment

M 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 pickup lens.
Avoid exposure to the laser beam , especially when performing adjustments.
ADJUSTMENT POINTS
LINE OUT
@ Main P.C.B.
a
es
fo
eros
OG
CN11 (Cathode) Q(Hav)
yo Connect the red Jead wire
of servo gain adjuster. PLeadieinent
yors
(Cathode)
test
point
Pie
@(-12v)
Connect the blue lead wire
of servo gain adjuster.
VR106 (Tracking balance adj.)
[@} vR105 (Tracking offset adj.)
oto
VR104 (Focus gain adj.)
VR103 (Focus offset adj.)
VR102 (Tracking gain adj.)
VR101 (Best eye adj.)
¢ a
TJ502
q as 5
CN102
(
Filter for focus offset (1)
Resistor: 10 kN
(ERDS2TJ103)
®Temporary Setting of Each VR
{
VR106
VR105
VR104
Capacitor: 1pF
(ECQM1H104KV)
VR103
VR102
VR101
Sa¢ddaa
ae
eas ee
To oscilloscope (+)
To oscilloscope (—)
ELECTRICAL ADJUSTMENT
Measuring Instruments and Special Tools
@ Servo gain adjuster (SZZP1017F)
@ Test disc
Test disc(SZZP1014F) old and new type
Inspection test disc (SZZP1054C)
Unever disc (SZZP1056C)
Black band disc (SZZP1057C)
Adjustment Procedure
Step 1:Remove the cabinet.
(Refer to page 6.)
Step 2:Make the temporary setting of
each VR . (Refer to page 11.)
Step 3:Temporary adjustment of focus and
tracking offset.(Refer to page 13.)
Step 4:Focus offset( 1) adjustment.
(Refer to page 13.)
Step 5:Best eye ( PD balance ) adjustment.
(Refer to page 13.)
Step 6:Connect the servo gain adjuster.
(Refer to page 12.)
Step 7:Focus gain adjustment.
(Refer to page 13.)
Connection of Servo Gain Adjuster
@ Ordinary disc
@ Two-channe! oscilloscope (with trigger)
of 30MHz or over
@ Low frequency oscillator
@ Conversion connector(SZZP1032F)
@ Filter (Low-pass)
Step 8:Tracking gain adjustment.
(Reter to page 14.)
Step 9:Focus offset ( 2 ) adjustment.
(Refer to page 14.)
Step 10:Tracking offset adjustment.
(Refer to page 14.)
Step 11:Connect the servo gain adjustment.
(Refer to page 12.)
Step 12:Tracking offset balance
adjustment.(Refer to page 15.)
Step 13:PLL adjustment.
(Refer to page 15.)
Step 14:Check of operation after
adjustment.(Refer to page 15.)
Low-frequency oscillator
i:
Gas
Servo gain adjuster
(SZZP1017F) GND OSC
@ ON/OFF switch @)
Selector
O:
TP3TP2 °
edie GNo@:,
>
Oscilloscope Oscilloscope connection
Wr) O_O terminals
wu} O
OO} TP2 TP3 TPI
CHI pare t $
G
—12V GND +12V
(Main) (Chassis) (Main)
Sa gl
©O9O
Oscillator connection terminals
Conversion connector
(SZZP1032F)
To CN102
*“ Remove the shorting connector
CN102 from main P.C.B.