Sony RCD-W3 Service Manual

20
RCD-W3
CD-R SECTION
Note :
1. CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10MΩ impedance.
4. Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the fol-
lowing checks.
RF Level Check
Procedure :
1. Connect oscilloscope to TP (RRF) and IC302 1 pin.
2. Turned Power switch on.
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check RF sig-
nal level is correct or not.
TP(RRF)
IC302
1 pin
BD-R board
oscilloscope
Note : Clear RF signal waveform means that the shape “ ◊ ” can be clearly
distinguished at the center of the waveform.
E-F Balance (1 Track jump) Check
Procedure :
1. Connect oscilloscope to TP (TE1) and PN301 qk Pin.
2. Turned Power switch on.
3. Load a disc (YEDS-18) and playback the number five track.
4. Press the X button. (Becomes the 1 track jump mode.)
5. Confirm that the level B and A (DC voltage) on the oscillo-
scope waveform.
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500ns
3T= 0.55
± 0.07Vp-p
11T= 0.90
± 0.13Vp-p
3T
11T
TP(TE1)
PN301
qk pin
BD-R board
oscilloscop
e
level=1.3 ± 0.6Vp-p
symmetry
A (DC voltage
)
center of
waveform
B
0V
1 track jump waveform
Specified level: –– × 100=less than ±22%
B
A
Adjustment Location:
[BD-R BOARD] (SIDE A)
C396
C363
R3C6
TP(RRF)
1
75
25
26
100
50
76
51
5
4
1
8
IC302
IC301
[BD-R BOARD] (SIDE B)
R369
TP(TE1)
C380
1
31
2
18
32
41
58
PN301

Sony RCD-W3 Specifications

Power

power requirements	U.S.A. and Canada 120 V AC, 60 Hz
power requirements other countries	110 – 240 V AC, 50/60 Hz
power consumption	20 W

Audio Specifications

frequency response	20 Hz – 20, 000 Hz (±0.5 dB)
signal-to-noise ratio	More than 100 dB
dynamic range	More than 95 dB

Inputs

analog in impedance	47 kilohms
rated input	330 mVrms
minimum input	125 mVrms

Outputs

analog out rated output	2 Vrms (at 50 kilohms)
load impedance	over 10 kilohms
phones	28 mW, 32 ohms

Weight and Dimensions

dimensions	430 × 108 × 368 mm
mass	4.6 kg