Akai AP D33 C Service Manual

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Akai AP D33 C Service Manual

Extracted text from Akai AP D33 C Service Manual (Ocr-read)


Page 26

AP-D33/C
AP-QSS/C

CHI
-—u—

CH2

—> 3.5msec

Fig. 16

4) Quartz-Look Phase Adjustment (V'Rl and VR2)

a) Set the Quartz-Lock Switch to ON (LOCK).

b) Set the Speed Selector to 45 rpm position.

0) Move the Tone Arm to make the power ON.

d) Connect the oscilloscope’s CH-l to P5-® and
CH-2 to PS- ©.

e) Set the VR] (500 kB) to mechanical center.

f) Adjust the VR2 (20 kB) so that the phase
different between CH-l and CH-Z is 3.5 msec
as shown in Fig. 16.

g) Connect the oscilloscope to P5-@.

h) Adjust VRl (500 kB) and VR2 (20 kB) so that
the a=b and c=d as shown in Fig. 17.

5) Wow and Flutter Confirmation
a) Put the Quartz Switch to OFF.
b) Playback the test record (3,000 Hz).
c) Check that the Wow and Flutter is to within
0.035% (JIS).
e) If not, re-adjust VR5, VR6 and VR7.

NOTE: Return Sensor Sensitivity Adjustment

Set the Return Sensor Sensitivity Adjust-
ment’s Semi-Fixed Volume VR4 to fully
clockwise (minimum base voltage of TRS).
In the future, Semi-Fixed Volume VR4 will
changed to Fixed Resistor.

25

Page 53

5. FINAL ASSEMBLY BLOCK

52

AL ASSEMBLY BLOCK

REF. NO. PARTS NO.

5-1
5-2):
5-3
54x
5-5
5-6::
5-7
5-8x
5-9
5-] 0x
5-] l
5-12x
5-] 3x
514
5-1 5
5-16

SK327182
SK327283
SZ3D7812A
523078123
SZSO7BI2A
523078123
SZ307839A
8230783913
52307841A
5230784113
SK325414
SK325415
25325524
BCBGOI338
SP325439
TP3327327

DESC RIPTION

ELEVATION LEVER KNOB
ELEVATION LEVER KNOB(BL)
SPEED CHANGE PUSH

SPEED CHANGE PUsH (BL)
SPEED CHANGE PUSH

SPEED CHANGE PUSH (BL)
QUARTZ PUSH

QUARTZ PUSH (BL)

LED DECORATIONPLATE

LED DECORATION PLATE (BL)
CONTROL KNOB

CONTROL KNOB (BL)

PT BRSOXIZSTL GMT C

DUST COVER PART

REAR PLATE

INSULATOR (B) PART AP-D40

When odering parts, please quote Pans Number, Description and Model Numbe1.————-"—