Technics SL-P2000

| SL-P2000 SL-P2000 |
Mi MEASUREMENTS AND ADJUSTMENTS
Warning: This product uses a laser diode.
ACHTUNG: ° Die lasereinheit nicht zerlegen.
Refer to caution statements on page 3.
*
Die
lasereinheit
darf
nur
gegen
eine
vom
hersteller
spezifizierte
einheit
ausgetauscht
werden.
Measuring Instruments and Special Tools
* Test discs
1. Playability test disc (SZZP1054C)
2. Uneven test disc (SZZP1056C)
* Musical program disc (ordinary)
* Dual-beam oscilloscope with bandwidth of 30MHz or
better (with EXT. trigger and 1: 1 probe).
PREPARATION
. Remove the cabinet and front panel ass’y (See Ref.
No. 1, 2 of the disassembly instructions).
. Remove the clamp plate ass’y, yoke, magnet and
clamper (see Ref. No. 14, 15 of the same).
. Remove the rotation lever, disc tray ass’y and drive
plate (see Ref. No. 16, 17, 19 of the same).
. Attach the front panel ass’y to the unit.
. Turn the pulley gear fully in the direction of arrow
until traverse unit comes up.
. Place the test disc and fix it by using the yoke,
magnet and clamper.
. Power switch to ON.
. While pushing the open/close det. switch (S751) in
the direction of arrow, push the play switch.
Adjusting Procedure
* (If you have replaced the optical pickup, spindle
motor, or turntable, do the following adjustment:
(1) TURNTABLE HEIGHT ADJUSTMENT
. Insert the 0.9mm clearance gauge (RZZ0297) between
the turntable and the loading base. (Refer to Fig. 2).
. Tighten the turntable retention screw with the
1.27mm allen wrench.
. Connect the oscilloscope’s CH. 1 probe across
(+) and SiG (—-) terminal via a filter (Refer to Fig. 3).
Note: For the connection of oscilloscope’s CH. 1 probe
to servo P.C.B. on foil side, refer to fig. 2.
Oscilloscope setting: VOLT
Input coupling
. Adjust oscilloscope’s DC zero balance.
. Switch the play power ON, and play the test disc
(SZZP1054C).
. Measure the voltage amplitude of the signal on the
oscilloscope.
Allen wrench (M2.0) (SZZP1101C)
Allen wrench (M1.27)
0.9mm clearance gauge (RZZ0297)
Filter
Lock paint (RZZOL01)
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Clearance gauge
m // (RZZ0297)
sole
(Oscilloscope)
(Soldered surface)
Fig. 3
7. Adjust the height until the voltage is
0+1.0V.
If the voltage exceeds +1.0V, lower
turntable.
If the voltage is below —1.0V, elevate the
turn table.
Note: Mesure the voltage as OV as possible.
(2) MECHANICAL ADJUSTMENT
1.
1.
(4)
(3) BEST EYE (PD BALANCE) ADJUSTMENT
Connect the oscilloscope’s CH. 1 probe across
(+) and (GND) on the servo P.C.B.
(Refer to Fig. 1)
Oscilloscope setting: VOLT ................... 100mV
SWEEP................-- 0.5ys.
Input coupling...... AC
. Switch the player power ON, and play track 7 on the
test disc (SZZP1056C).
(Playing any other track will prevent the HEX screws
from being accessed.)
. Leave the player in play mode and place it as shown
Fig. 5.
. Alternately adjust the HEX screws with the 2.0mm
allen wrench (SZZP1101C) until the vertical
fluctuation of RF signal is minimized and the eye
pattern is most stretched. (Refer to Fig. 4)
. After completing the adjustment, lock the HEX
screws with lock paint (RZZOLO1).
Connect the oscilloscope’s CH. 1 probe across
(+) and (GND) on the servo P.C.B.
(Refer to Fig. 1)
Oscilloscope setting: VOLT...............0... 100mV
SWEEP... ecco 0.5us.
Input coupling...... AC
. Switch the player power ON, and play the 1kHz
(track 1) on the test disc (SZZP1054C).
. Adjust VR101 until the vertical fluctuation of RF
signal is minimized and the eye pattern is most
stretched. (Refer to Fig. 6)
CHECK OF PLAY OPERATION AFTER
ADJUSTMENT
Checking Skip Search
. Play an ordinary musical program disc.
. Press the skip button to check for normal skip search
operation (in both the forward and reverse direc-
tions).
Checking Manual Search
. Play an ordinary musical program disc.
. Press the manual search button to check for smooth
manual search operations at either low or high speed
(in both the forward and reverse directions).
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ease
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PANY
VO
OOO
AYN
WOOHOO
A
>< Most stretched eye pattern.
Fig. 4
Most stretched eye pattern.
Fig. 6
* Checking Playability
1. Play the 0.7mm black dot and the 0.7mm wedge on
the playability test disc (SZZP1054C) and verify
that no sound skip or noise occurs.
2. Play the middie tracks of the uneven test disc
(SZZP1056C) and verify that no sound skip or
noise occurs.