Sony PMC-222V Service Manual ▷ View online
— 23 —
Precautions in Repairing
Note :
Note :
As a FM front end (U1) is difficult to repair if faulty, replace
it with new one.
(FM is no adjustment)
[AM]
BAND : AM
Signal generator
Signal generator
Adjustment Location : MAIN board (Component side)
0 dB = 1 µV
• Repeat the procedures in each adjustment several times for the
maximum level meter indication.
• The frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
CFT1
450kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
612kHz
CT1
1,404kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust part
Frequency display
Reading on digital
voltmeter
L3
531kHz
1.0V
Confirmation
1,611kHz
5.0V
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
signal.
Output level : as low as possible
AM RF signal
generator
generator
32
Ω
set
+
–
level meter
J303 (phones)
TUNER SECTION
U1
FM FRONT END
FM FRONT END
L2
L3
AM frequency coverage
adjustment
AM frequency coverage
adjustment
CT1
AM tracking adjustment
CFT1
AM IF adjustment
AM IF adjustment
IC1
— 24 —
Notes on Adjustment
1.
Perform adjustments in the order given.
2.
Use the disc (YEDS-18, Parts No. 3-702-101-01) only when
so indicated.
so indicated.
• Focus Search Check
1.
Press the CD ^ key. (Focus search operation is performed
continuously.)
continuously.)
2.
Look at the Optical pick-up objective lens and confirm that it
moves up and down smoothly, with no catching or abnormal
noises.
moves up and down smoothly, with no catching or abnormal
noises.
3.
Press p button.
Confirm that focus search operation stops. If it does not, press
p button again longer.
Confirm that focus search operation stops. If it does not, press
p button again longer.
Note :
When the malfunction is occurred by mis-passing other keys,
turn off the power and check again.
turn off the power and check again.
CD SECTION
E-F Balance Adjustment
This adjustment is to be done when the optical pick-up is replaced.
Adjustment Procedure:
1.
Connect the oscilloscope to test point TP (VC) and TP
(TRACKING-Y) on CD board.
(TRACKING-Y) on CD board.
2.
Insert the disc (YEDS-18) in and close the lid for CD.
3.
Press ^ button.
4.
Press the search button for focus search mode.
5.
Adjust RV702 so that the oscilloscope traverse waveform is
symmetrical, as shown in the figure below.
symmetrical, as shown in the figure below.
6.
Confirm the waveform is exactly symmetrical when a track
jump.
jump.
Adjustment Location: CD board (See page 27)
Oscilloscope
(DC range)
+
–
–
CD board
TP (TRACKING-Y)
TP (VC)
A
B
0V
VOLT/DIV : 0.1V
TIME/DIV : 1ms
TIME/DIV : 1ms
A = B C = 200 – 600mV
C
0V
A=B
A
B
Note : Take long sweep time
for easy monitoring.
for easy monitoring.
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— 25 —
— 26 —
— 27 —
Focus Bias Adjustment
This check is to be done when the optical pick-up is replaced.
Adjustment Procedure:
1. Connect the oscilloscope to test point TP (VC) and TP (RF) on
CD board.
2. Insert the disc (YEDS-18) in and close the lid for CD.
3. Press ^ button.
4. Adjust RV701 so that the oscilloscope wavewform is as shown
3. Press ^ button.
4. Adjust RV701 so that the oscilloscope wavewform is as shown
in the figure below (eye pattern).
A good eye pattern means that the diamond shape (
A good eye pattern means that the diamond shape (
◊
) in the
center of the waveform can be clearly distinguished.
• RF signal reference waveform (eye pattern)
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensivity.
and raise vertical sensivity.
Adjustment Location: CD board (See page 27)
Focus/Tracking Gain Adjustment
A frequency response analyzer is necessary in order to perform this
adjustment exactly.
However, this gain has a margin, so even if it is slightly off, there is
no problem. Therefore, do not perform this adjustment.
Focus/Tracking gain determines the pick-up follow-up (vertical and
horizontal) relative to mechanical noise and mechanical shock when
the 2-axis device operate.
However, as these reciprocate, the adjustment is at the point where
both are satisfied.
• When gain is raised, the noise when the 2-axis device operates
adjustment exactly.
However, this gain has a margin, so even if it is slightly off, there is
no problem. Therefore, do not perform this adjustment.
Focus/Tracking gain determines the pick-up follow-up (vertical and
horizontal) relative to mechanical noise and mechanical shock when
the 2-axis device operate.
However, as these reciprocate, the adjustment is at the point where
both are satisfied.
• When gain is raised, the noise when the 2-axis device operates
increases.
• When gain is lowered, it is more susceptible to mechanical shock
and skipping occurs more easily.
• When gain adjustment is off, the symptoms below appear.
Tracking
Gain
Symptoms
Focus
• The time until music starts
becomes longer for STOP ➡
CD ^ or automatic
selection (0 , ) buttons
pressed). (Normally takes
about 2 seconds.)
CD ^ or automatic
selection (0 , ) buttons
pressed). (Normally takes
about 2 seconds.)
• Music does not start and disc
continues to rotate for STOP
➡ CD ^ or automatic
selection (0 , ) buttons
pressed.)
➡ CD ^ or automatic
selection (0 , ) buttons
pressed.)
• Sound is interrupted during
PLAY. Or time counter
display stops progressing.
display stops progressing.
• More noise during 2-axis
device operation.
low
—
—
high
low or high
low
low
high
VOLT/DIV : 0.2V
TIME/DIV : 500ns
TIME/DIV : 500ns
1.1 – 1.5Vp-p
Oscilloscope
(AC range)
+
–
–
CD board
TP (RF)
TP (VC)
• Good Example
• Incorrent Examples (DC level changes more than on adjusted
waveform)
low focus gain
high focus gain
low tracking gain
high tracking gain
(high fandametial wave than for low gain)
(high fandametial wave than for low gain)
• Incorrect Examples (fundamental wave appears)
8.
Connect the oscilloscope between TP (TRACKING-Y) and TP
(VC).
(VC).
9.
Adjust RV703 so that the waveform is as shown in the figure
below. (tracking gain adjustment)
below. (tracking gain adjustment)
Oscilloscope
(DC range)
+
–
–
CD board
TP (TRACKING-Y)
TP (FOCUS-Y)
TP (VC)
The following is a simple adjustment method.
– Simple Adjustment –
Note:
Note:
Since exact adjustment cannot be performed, remember the
positions of the controls before performing the adjustment.
If the positions after the primary adjustment are only a little
different, return the controls to the original position.
positions of the controls before performing the adjustment.
If the positions after the primary adjustment are only a little
different, return the controls to the original position.
Procedure:
1. Keep the set horizontal.
1. Keep the set horizontal.
If the set is not horizontal, this adjustment cannot be performed
due to the gravity against the 2-axis device.
due to the gravity against the 2-axis device.
2. Connect the oscilloscope TP (FOCUS-Y) and TP (VC) on the
CD board.
3. Insert the disc (YEDS-18) in and close the lid for CD.
4. Press the ^ button.
5. Adjust RV704 so that the waveform is as shown in the figure
4. Press the ^ button.
5. Adjust RV704 so that the waveform is as shown in the figure
below. (Focus gain adjustment)
100mV
0V
VOLT/DIV : 100mV
TIME/DIV : 2ms
TIME/DIV : 2ms
VOLT/DIV : 100mV
TIME/DIV : 2ms
TIME/DIV : 2ms
250mV
0V
VOLT/DIV : 100mV
TIME/DIV : 2ms
TIME/DIV : 2ms
100mV
75mV
75mV
0V
VOLT/DIV : 1V
TIME/DIV : 2ms
TIME/DIV : 2ms
0V
VOLT/DIV : 0.1V
TIME/DIV : 2ms
TIME/DIV : 2ms
0V
VOLT/DIV : 0.1V
TIME/DIV : 2ms
TIME/DIV : 2ms
0V
Note:
VOLT/DIV: with the 10:1 probe in used.
VOLT/DIV: with the 10:1 probe in used.
Adjustment Location: CD board (See page 27.)
Adjustment Location:
REFERENCE
RV704
Focus gain
adjustment
Focus gain
adjustment
RV703
Tracking gain
adjustment
Tracking gain
adjustment
RV702
E-F balance
adjustment
E-F balance
adjustment
RV701
Focus bias
adjustment
Focus bias
adjustment
TP
(TRACKING Y)
(TRACKING Y)
TP
(VC)
(VC)
TP
(FOCUS Y)
(FOCUS Y)
TP
(RF)
(RF)
PMC-222V
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○
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— 28 —
— 29 —
— 30 —
SECTION 5
DIAGRAMS
5-1. BLOCK DIABRAM — CD, VIDEO CD SECTION —
OPTICAL PICK-UP
BLOCK
(KSS-213C/Q-RP)
LD/POWER
CONTROL
Q701
38
VCC
CD5V
A
VC
C
B
D
E
F
VC
LD
GND
A
C
B
D
E
F
FOCUS
COIL
F+
F
T+
T
TRACKING
COIL
36
34
39
36
35
48
APC
FOCUS PHASE
COMPENSATION
DECODER
SERIAL/
PARALLEL
CONVERTER
FE
AMP
RF
AMP
IIL
TTL
TTL
IIL
COMAND
VC
TRACKING PHASE
COMPENSATION
LD
PD
E
F
PD1
PD2
6
24
23
20
19
22
21
31
25
SENS
RFO
FOK
C OUT
DATA
XLT
CLK
XRST
16
13
FEO
TEO
SLO
IC703
F/T COIL
SL/SP MOTOR
DRIVER
CD RF/SERVO
PROSSESOR
IC701
18
VCC
CD5V
2
24
T IN
1
27
26
VR
PD
PD
18
17
12
11
3
F IN
19
SL IN
15
SP IN
7
MUTE
F+
F
T+
T
SL+
SL
SP+
SP
M
M
MOTOR
M702
SLED
SLED
MOTOR
M701
SPINDOL
S701
DOOR
EFM
DEMO.
24
1
76
75
77
78
79
3
CLV
SERVO
DIGITAL
CLV
SUB CODE
PROSSESOR
MDP
CLK
XLT
DATA
SEIN
CNIN
FOK
RF
CD DIGITAL
SIGNAL PROCESSOR
IC702
16
40 EI
E-F
BALANCE
RV702
37
F BIAS
42
TO
FOCUS
BIAS
RV701
TRACKING
GAIN
RV703
2
FI
FOCUS
GAIN
RV704
Q702
16.9344MHz
CPU
I/F
DIGITAL
OUT
32K
RAM
D/A
PROC.
S/P
PROC.
TIMING
GEN 2
TIMING
GEN 1
60
61
34
32
LRCK
PCMD
EMPH
D OUT
35
BCK
XT
AI
34
XT
AO
35
X701
: CD
• Signal Path
SENS
69
D
ATA
71
CLOCK
74
XLA
T
72
70 XRST
SCOR
63
SQSO
66
SQCK
67
44
C2PO
RST
100
74
BCK
MPFG DECODER
U1007
12
R OUT
HSY
17
DAEMP
119
DATA
105
BCK
106
C2PO
103
LRCK
104
VD3
VD7
69
72
74
.
79
.
80
.
82
.
29
22
84
86
.
89
.
.
91
94
.
VD11
VD16
.
VD19
VD23
9
11
15
.
6
8
.
.
HD0
HD7
8
HSEL0
127
HSEL1
128
HSEL2
1
XDS
2
RW
3
DACK
5
XINT
113
XAVRST
101
A0
A1
A2
52 49
38
31
R0/C0
R7/C7
G0/Y0
G7/Y7
CVSY
18
VCLK
15
BEEP
44
96
H SYNC
95
V SYNC
99
VCLK
3
NTSC/PAL SW
48
VIDEO
DIGITAL RGB
NTSC/PAL ENCODER
U1006
Q1001
108
DA DATA
109
DA BCK
107
DA LRCK
111
DA XCLK
BCKI
5
DI
6
LRCI
8
XTI
18
RSTN
22
14
L OUT
1
MUTE
D/A CONVERTER
U1009
MUTE
SWITCH
Q1004,1005
MUTE
Q1003
MUTE
Q1002
16
63
59
57
.
53
23
28
30
.
31
.
34
.
37
39
42
.
MD1
MD15
11
13
15
19
.
16
19
22
.
26
15
.
16
2
5
7
.
10
31
.
34
36
39
.
DQ0
DQ15
MA0
MA9
24
21
23
.
2
.
26
10
3
.
.
27
.
.
1
.
D0
D7
A0
A15
8
4M BIT DRAM
U1004
64KB ROM
U1002
WE
13
CE
20
RAS
14
UCAS
28
LCAS
29
32
XMCEO
47
MWE
51
PASO
48
UCAS
44
LCAS
MA0
MA9
10
16
D1004
D1003
MUTE
68
8
62
HSEL2
63
HSEL1
64
HSEL0
60
DS
61
WR
5
DACK
15
VCD IRQ
67
VCD RST
73
DAXCLK
HD0
HD7
A0
A1
A2
SQCK
18
SQSO
4
SCOR
17
7
BEEP
78
NTSC
9
AMUTE
XLT OUT
20
X1001
40.5MHz
XLT IN
19
33
48
22
29
10
3
25
.
24
.
21
.
23
.
2
26
.
27
.
.
1
A0
A15
.
11
13
15
19
.
D0
D7
A0
A15
D0
D7
8
8
8
16
RAM
U1005
OE
22
21
OE
CCE
16
BUCK
13
BUI
3
BUO
1
3
4
2
1
U1003
U1003
BUI
BUO
BUCK
CCE
SQCK
SQSO
SCOR
CMUTE
XLAT
CLOCK
DATA
SENS
LDON
XRST
DOP
XI
11
XO
12
SYSTEM CONTROL
U1008
X1002
12MHz
A
TUNER, TAPE, AMP
SECTION
: VIDEO
L.P.F
L OUT
R OUT
B
TUNER,
TAPE,
AMP
SECTION
VIDEO
VIDEO OUT
NTSC
PAL
S1001
J1001
PUI
S702
LIMIT
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