Sony HCD-VX99 / MHC-VX99 Service Manual ▷ View online
21
Note: Clear RF signal waveform means that the shape “
◊” can be
clearly distinguished at the center of the waveform.
RF signal waveform
E-F Balance (1 Track jump) Check
Procedure:
1.
1.
Connect oscilloscope to TP (TEO) and TP (VC) board.
2.
Turned Power switch on.
3.
Load a disc (YEDS-18) and playback the number five track.
4.
Press the Y button. (Becomes the 1track jump mode.)
5.
Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.
waveform.
1 track jump waveform
Specification level: x 100=less than ±22%
6.
After check, remove the lead wire connected in step 1.
RF PLL Free-run Frequency
Procedure :
1.
Procedure :
1.
Connect frequency counter to test point (XPCK) with lead wire.
2.
Turned Power switch on.
3.
Put the disc (YEDS-18) in to play the number five track.
Confirm that reading on frequency counter is 4.3218MHz.
Confirm that reading on frequency counter is 4.3218MHz.
VOLT/DIV : 200mV
TIME/DIV : 500ns
TIME/DIV : 500ns
level : 1.45
± 0.3Vp-p
oscilloscope
BD board
TP (TEO)
TP (VC)
TP (VC)
+
–
–
0V
Center of
waveform
waveform
B
Symmetry
A (DC voltage)
level=1.3
±0.6Vp-p
A
B
B
+
–
–
frequency counter
BD board
TP (XPCK)
22
VIDEO SECTION
Frequency adjustment
1.
Connect the frequency counter to check point of the VIDEO
board.
board.
2.
Adjust CT503 of the VIDEO board so that the frequency counter
read 27MHz ± 80Hz at STOP condition.
read 27MHz ± 80Hz at STOP condition.
[ VIDEO BOARD ] – SIDE B –
Adjustment Location :
[ VIDEO BOARD ] – SIDE A –
frequency counter
VIDEO board
(27 MHz)
(27 MHz)
+
–
–
SL501
IC502
SL502
SL503
TEST
MODE
SL501 SL502
CT503
SL503
TEST MODE
VIDEO
FREQUENCY
(27MHz)
(GND)
IC507
IC505
Adjustment Location :
[ BD BOARD ] — SIDE B —
TP
(VC)
(VC)
TP
(RF)
(RF)
TP
(TEO)
(TEO)
TP
(IOP)
(IOP)
TP
(FEO)
(FEO)
TP
(AGND)
(AGND)
TP
(DGND)
(DGND)
TP
(AGCCON)
(AGCCON)
IC102
HCD-VX99
23
23
SECTION 7
DIAGRAMS
7-1. CIRCUIT BOARD LOCATION
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.
•
f
: 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.
Note:
The components identified by mark 0 or dotted line with
mark 0 are critical for safety.
Replace only with part number specified.
The components identified by mark 0 or dotted line with
mark 0 are critical for safety.
Replace only with part number specified.
• 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
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.)
B
These are omitted.
C
E
Q
PANEL Board
LEAF SW Board
HEAD (A) Board
HEAD (B) Board
TRANS Board
CD SWITCH Board
VIDEO Board
BD Board
DRIVER Board
MOTOR Board
SENSOR Board
MAIN Board
POWER AMP Board
C
B
These are omitted.
E
Q
HCD-VX99
24
24
Waveforms
– BD SECTION –
– BD SECTION –
– VIDEO SECTION –
– MAIN BOARD –
1
IC601 oa
STOP MODE
4.8Vp-p
12.5MHz
– PANEL BOARD –
1
IC101 t;
RFAC
2
IC101 ra
TE
3
IC101 el
FE
4
IC101 wg
MDP
1.3Vp-p
APPROX 500mVp-p
2.5V
APPROX 200mVp-p
2.5V
2.6Vp-p
7.5
µsec
1
IC502 qd
XOUT
2
IC505 ug
COUT
3
IC505 yl
YOUT
4
IC304 9
COUT
5
IC304 qg
YOUT
6
IC509 1
XT1
7
IC509 ql
LRCK
8
IC509 qj
BCK
9
IC504 8
384FS
q;
IC504 6
27M
4Vp-p
10MHz
H
1Vp-p
H
1Vp-p
2Vp-p
H
2Vp-p
H
27MHz
5.8Vp-p
4.6Vp-p
44.1kHz
4.8Vp-p
2.11MHz
4.8Vp-p
33.8MHz
3.8Vp-p
27MHz
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
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