DOWNLOAD Sony HCD-CP2A Service Manual ↓ Size: 5.94 MB | Pages: 54 in PDF or view online for FREE

13

Procedure:
1. Mode: Record

2. Mode:  Playback

Confirm playback the signal recorded in step 1 become adjustable
limits as follows.
If these levels do not adjustable limits, adjustment the RV403 (L-
CH) and RV423 (R-CH) on the TC board to repeat steps 1 and 2.
Adjustable limits: Playback output of 315 Hz to playback output

of 10 kHz: 0 ± 0.5 dB

Adjustment Location: TC and MAIN boards

Procedure:
1. Mode: Record

2. Mode: Playback

Confirm playback the signal recorded in step 1 become adjustable
limits as follows.
If these levels do not adjustable limits, adjustment the RV101 (L-
CH) and RV201 (R-CH) on the MAIN board to repeat steps 1 and
2.
Adjustable limits:

IC306 PB level: 36.7 to 41.1 mV (–26.5 to –25.5 dB)

Adjustment Location:  MAIN board

Pin rd (L-CH) of IC306 on the MAIN board.
Pin th (R-CH) of IC306 on the MAIN board.
1) 315 Hz
2) 10 kHz







Pin rl (GND) of IC306 on the MAIN 
board.

Ω

IC306 (Pin r; : L-CH)

(Pin 3 : R-CH)

Pin rd  (L-CH) of IC306 on the MAIN board.
Pin th  (R-CH) of IC306 on the MAIN board.
315 Hz, 50 mV (–23.8 dB)

Pin rl  (GND) of IC306 on the MAIN board.

Ω

IC306 (Pin r; : L-CH)

(Pin 3 : R-CH)

14

1.

CD Block is basically constructed to operate without
adjustment.

2.

Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.

3.

Use an oscilloscope with more than 10 M

Ω

 impedance.

4.

Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.

5.

Check the focus bias check when optical block is replaced.

Procedure :
1.

Connect oscilloscope to TP (RF) and TP (VC) on the CD board.

2.

Press the 

I

/1 button to turn the power on, and press the Z

(CD) button to open the CD disc tray.

3.

Put disc (YEDS-18) in and press the 

u

 (CD) button to play-

back.

4.

Confirm that oscilloscope waveform is as shown in the figure
below. (eye pattern)
A good eye pattern means that the diamond shape ( 

 

) in the

center of the waveform can be clearly distinguished.

±

s

15

15

Note on Printed Wiring Boards:
•

X

: parts extracted from the component side.

•

Y

: parts extracted from the conductor side.

•

W

: indicates side identified with part number.

•

b

: Pattern from the side which enables seeing.

• Abbreviation

AUS

: Australian model

EA

: Saudi Arabia model

Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted.  pF: µµF

50 WV or less are not indicated except for electrolytics
and tantalums.

• All resistors are in 

Ω

 and 

1

/

4

 

W or less unless otherwise

specified.

•

f

: internal component.

•

C

: panel designation.

•

U

: B+ Line.

•

V

: B– Line.

•

H

: adjustment for repair.

• Voltages are taken with a VOM (Input impedance 10 M

Ω

).

Voltage variations may be noted due to normal produc-
tion tolerances.

• Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal produc-
tion tolerances.

• Circled numbers refer to waveforms.
• Signal path.

F

: TUNER

E

: TAPE PLAY (DECK A)

d

: TAPE PLAY (DECK B)

G

: TAPE REC

J

: CD PLAY (ANALOG)

c

: CD PLAY (DIGITAL)

• Abbreviation

AUS

: Australian model

EA

: Saudi Arabia model

Note: The components identified by mark 

0

 or dotted line

with mark 

0

 are critical for safety.

Replace only with part number specified.

16

16

IC101

C-2

IC102

B-3

IC103

C-2

Q101

B-1

Ref. No.

Location

(Page 23)