Technics SL-P999

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Measuring Instruments and Special Tools
Servo gain adjuster (SZZP1017F)
..Refer to page 18.
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) oscillator
AC electronic voltmeter
Adjusting Procedure
If you have replaced the spindle motor or turntable,
perform the following adjustment:
i 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 (—) terminals .
(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.......... 50 mV
Input coupling...
. Adjust oscilloscope’s DC zero balance.
. Switch the player power ON, and play the test disc
(SZZP1014F or SZZP1054C).
. Measure the DC level displayed on the oscilloscope.
MECHANICAL ADJUSTMENT
. Connect the oscilloscope’s CH. 1 probe across BEM BIeh|
(+) 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). (Playing any other track may
yield a false adjustment.)
. Leave the player in Play mode, and place it as shown in
the figure on the 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).
Distortion analyser
Adapter (SZZP1032F)
Allen wrench (M2.0)
Allen wrench (M1.27)
0.9mm clearance gauge (RZZ0297)
* * © &
As to the replacement of the following parts, refer to
the specified sections for adjustment.
(1) Spindle motor............0.... Sections (1), (3) to (8)
* (2) Turntable woe Sections (1), (3) to (8)
(3) Optical pickup... Sections (2) to (8)
Note 1. If the measured amplitude is within a range of
+/— 15mV, the turntable height is correct. If 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 —15mV, elevate the turntable.
Turntable
Clearance gauge
(RZZ0297)
1
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.)
Mechanical
adjustment
screws
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%* Minimize the variation of amplitude.
BEST EYE (PD BALANCE) ADJUSTMENT
.
Connect
the
oscilloscope’s
CH.
1
probe
across
BET
(+) and BINBRepy (—) on the Servo P.C.B.
Oscilloscope setting: VOLT
Input coupling...
. Switch the player power ON, and play the 0.5 mm black
dot on the test disc (SZZP1014F or SZZP1054C).
. Adjust VR101 until the RF signal eye pattern amplitude
is Maximized.
FOCUS GAIN ADJUSTMENT
. Connect the servo gain adjuster to the player (see page
18).
. Set the servo gain adjuster’s gain switch to position “2”
and the ON/OFF switch to ON.
. Set up the AF oscillator output for 825Hz, 150 mVp-p,
and connect it across the OSC and GND terminals on the
servo gain adjuster.
. Connect oscilloscope’s CH. 1 and CH. 2 probes to the
servo gain adjuster’s TP1 and TP2 terminals, respectively
(TP3 is GND).
Oscilloscope setting: VOLT
(both channels)
Input coupling... AC
. Play the test disc (SZZP1014F or SZZP1054C).
. Set the servo gain adjuster’s gain switch to position “3”,
and you will see a 825 Hz signal on the oscilloscope.
Adjust VR104 until the signal amplitudes on both
channels become identical to each other.
. Set the gain switch back to position “2”.
TRACKING GAIN ADJUSTMENT
. Set up the AF oscillator output for 1.1 kHz, 150 mVp-p,
and connect it across the OSC and GND terminals on the
servo gain adjuster.
. Connect oscilloscope’s CH. 1 and CH. 2 probes to the servo
gain adjuster’s TP1 and TP2 terminals, respectively
(TP3 is GND).
Oscilloscope setting: VOLT ..
(both channels)
Input coupling... AC
. Switch the player power ON, and play the test disc
(SZZP1014F or SZZP1054C).
. Set the servo gain adjuster’s gain switch to position “1”,
and you will see a 1.1 kHz signal on the oscilloscope.
Adjust VR102 until the signal amplitudes on both
channels become identical to each other.
. Set the gain switch back to position “2”.
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* Maximize the amplitude.
XX Adjust VR104 until a equals b.
XK Adjust VR102 until a equals b.