Technics SL-P200 Service Manual

Fsi.7200 |
Mi
MEASUREMENTS
AND
ADJUSTMENTS
Caution:
e 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 tens.
Avoid
exposure
to
the
laser
beam,
especially
when
performing
adjustments.
PREPARATION
1. Remove the cabinet (see Ref. No. 1 in the original Service
Manual).
2. Remove the disc clamper and magnet (see Ref. No. 2 of the
same).
3. Remove the disc holder and power switch rod (see Ref. No.
3 of the same).
Place the test disc and magnet on the turntable.
oP,
While holding the Open/Close switches (S101, S102) in the
directions indicated by the arrows, switch the player power
ON.
6. After the test disc starts rotating, release the Open/Close
switch (S101, $102).
ADJUSTMENT POINTS
© Servo P.C.B.
RF output
Adjusting
fixture
(Focus wae (Focus gain / (Tracking offset adj.)
adj.) adj.)
(Tracking
Test disc
Magnet
e¢ Main P.C.B.
(L) (R)
Connect the red lead
wire of servo gain
D15/ adjuster.
AS 21
P bas
Connect the blue wire
of servo gain adjuster.
¢ Temporary setting of each VR
VR106 = VR101_ ~=—s: VR105, VR102.-VR103
eRe
yy f
replaced or require readjustment, temporarily set them
( Temporary VR setting if any of the trimmer VRs are )
to the following positions.
Measuring Instruments and Special Tools
* Servo gain adjuster (SZZP1017F)
Test discs
. Playability test disc (SZZP1054C or SZZP1014F)
. Uneven test disc (SZZP1056C)
. Black band test disc (SZZP1057C)
Normal disc
Dual-beam oscilloscope with bandwidth of 30MHz or
better (with EXT trigger and 1:1 probe).
Audio frequency (AF) oscilator
Conversion connector (SZZP1032F)
Adjusting Procedure
*
lf you have replaced the spindle motor or turntable, do
the following adjustment:
" TURNTABLE HEIGHT ADJUSTMENT
. Insert the 0.9mm clearance gauge (RZZ0297) between
the turntable and the loading base (see the figure at
right).
. Tighten the turntable retention screw with the 1.27mm
allen wrench.
. Connect the oscilloscope’s CH. 1 probe across VR104's
(+) and VR106‘s BY@asisteg (—) terminals via a
filter.
(Note: A voltage of 2.5V appears at the V. REF terminal.
Take care not to short the player’s chassis to the oscil-
loscope ground.)
Oscilloscope setting: VOLT
Input coupling...
. Adjust oscilloscope’s DC zero balance.
. Switch the player power ON, and play the test disc
(SZZP1014F or SZZP1054C).
. Measure the voltage amplitude of the signal on the
oscilloscope.
MECHANICAL ADJUSTMENT
. Connect the oscilloscope’s CH. 1 probe across MR RIGh}
(+) and (—) on the Servo P.C.B.
Oscilloscope setting: VOLT.......... 100 mV
SWEEP......... 0.5 us.
Input coupling... AC
. Switch the player power ON, and play track 9 on the
test disc (SZZP1056C).
. Leave the player in Play mode, and place it on its right
side as shown at right.
. Alternately adjust the two mechanical adjusting screws
with the 2.0mm allen wrench until the RF signal
amplitude variation on the oscilloscope is minimized.
. After completing the adjustment, lock the mechanical
adjustments with lock paint (RZZOLO1).
* Allen wrench (M2.0)
* Allen wrench (M1.27)
* 0.9mm clearance gauge (RZZ0297)
Perform adjustments depend on the part to be replaced
according to followings:
(1) Spindle motor
(2) Turntable
(3) Optical pickup
Items 1, 3 to 8
Items 1, 3 to 8
Items 2 to 8
Note 1. If the measured amplitude is within a range of
+/-— 15mvV, the turntable height is correct. {f it is
outside this range, adjust the turntable height by
using the clearance gauge as a pry.
If the amplitude exceeds +15mV, lower turntable.
If the amplitude is below ~15mvV, elevate the turntable.
Turntable
Clearance gauge
(RZZ0297)
!
Spindle motor
Note 2. If the measured amplitude greatly surpasses or
falls short of the range above, set VR105 at or around
the center, then try to adjust the height again. (Then
be sure to adjust the focus offset as well.)
x Minimize the variation of lt

Technics SL-P200 Specifications

General

Brand	Technics
Model	SL-P200
Category	CD Player
Language	English