Sony HCD-VX55J / MHC-VX55 / MHC-VX55J Service Manual ▷ View online
21
VIDEO SECTION
Frequency Adjustment
Connection:
Procedure:
1. Connect the frequency counter to check point of the VIDEO
1. Connect the frequency counter to check point of the VIDEO
board.
2. Turned power switch on.
3. Press the CD button to select the CD.
4. Adjust CT503 on the VIDEO board so that the frequency counter
3. Press the CD button to select the CD.
4. Adjust CT503 on the VIDEO board so that the frequency counter
reading 27.0 MHz
± 80 Hz at stop status.
Adjustment Location:
[VIDEO BOARD] (Component Side)
J301
J302
CN501
CN503
SL503
SL502
SL501
CHECK LED
CN502
IC507
(GND)
(27MHz)
CT503
VIDEO
Frequency
Adjustment
VIDEO
Frequency
Adjustment
VIDEO board
(27 MHz)
frequency counter
22
SECTION 7
DIAGRAMS
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω and
1
/
4
W or less unless otherwise
specified.
•
¢
: internal component.
• C : panel designation.
Note on Printed Wiring Boards:
• X : parts extracted from the component side.
• b : Pattern from the side which enables seeing.
• Indication of transistor.
• X : parts extracted from the component side.
• b : Pattern from the side which enables seeing.
• Indication of transistor.
• U : B+ Line.
• V : B– Line.
• H : adjustment for repair.
• Voltages and waveforms are dc with respect to ground
• V : B– Line.
• H : adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
• Voltages are taken with a VOM (Input impedance 10 M
Ω).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
• Signal path.
F
: FM
f
: AM
E
: PB (DECK A)
d
: PB (DECK B)
G
: REC (DECK B)
J
: CD
c
: digital out
• Abbreviation
EA
: Saudi Arabia model
MY
: Malaysia model
SP
: Singapore model
TH
: Thai model
TW
: Taiwan model
IA
: Indonesia model
HK
: Hong Kong model
JE
: Tourist model
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
(In addition to this, the necessary note is printed in each block.)
C
B
These are omitted.
E
Q
B
These are omitted.
C
E
Q
HCD-VX55/VX55J
The components identified by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part number specified.
line with mark 0 are critical for safety.
Replace only with part number specified.
23
7-1. CIRCUIT BOARD LOCATION
HCD-VX55/VX55J
PANEL Board
LEAF SW Board
HEAD (A) Board
HEAD (B) Board
TRANS Board
CD SWITCH Board
VIDEO Board
BD Board
DRIVER Board
MOTOR Board
ADDRESS SENSOR Board
MAIN Board
POWER AMP Board
24
HCD-VX55/VX55J
• WAVEFORMS
4
IC101 wg (MDP)
2
IC101 ra
(TE)(CD Play mode)
1
IC101 t;
(RFAC)(CD Play mode)
3
IC101 el
(FE)(CD Play mode)
2.6 Vp-p
15.1
µs
0.2 Vp-p
0.5 Vp-p
1.3 Vp-p
1
IC401 qa
STOP MODE
3.0Vp-p
32.768kHz
3.4Vp-p
2
IC401 qd
STOP MODE
3
T301 4
TAPE B REC MODE
16MHz
120Vp-p
80.7kHz
1
IC601 oa
STOP MODE
4.8Vp-p
12.5MHz
– BD BOARD –
– MAIN BOARD –
– PANEL BOARD –
4
J301 3 (COUT)
9
IC505 (VCK-IN)
7
IC505 od (VSYNC)
8
IC505 (HSYNC)
3
J301 4 (YOUT)
1
IC502 qd (XOUT)
37 nsec
4.6 Vp-p
10 MHz
3.5 Vp-p
20 ms
3.2 Vp-p
64
µs
2.0 Vp-p
H
H
2.0 Vp-p
5.4 Vp-p
101
106
2
IC502 wh (BGP)
5
J302 (VIDEO OUT)
6
IC505 ih (DA-XCLK)
3.6 Vp-p
17 MHz
q;
IC505 (DA-LRCK)
108
qa
IC505 (DA-BCK)
111
qs
IC509 w; (384FSO)
qd
IC509 wf (XT2)
qf
IC509 4 (MCKO)
4.5 Vp-p
H
1.3 Vp-p
H
4.5 Vp-p
22.7
µs
4.5 Vp-p
472 ns
5.0 Vp-p
59 ns
2.0 Vp-p
37 ns
5.2 Vp-p
37 ns
– VIDEO BOARD –
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