Sony KV-21V4A Service Manual ▷ View online
– 70 –
Pin No.
Signal
I/O
Function
69
DRM FG
I
Drum FG input.
70
CAP FG
I
Capstan FG input.
71
OSD MUTE
O
Video output mute signal. H : Gray back. (Not used. (open))
72
CAP RVS
O
Capstan reverse control. H : Reverse.
73
CAP DA
O
Capstan D/A output.
74
DRM DA
O
Drum D/A output.
75
EP
O
L : EP (Not used. (open))
76
ORC SETTEI
O
H : ORC measure.
77
VD CTL
I
CTL counter input. (Fixed to “H”.)
78
DEST 1
I
Destination judge input.
79
LINE 1
O
Input selection control signal.
80
SO 1
I/O
Expanded port data.
81
CLK 1
I/O
Expanded port clock.
82
LINE 2
O
Input selection control signal. (Not used. (open))
83
NAPB
O
Audio output control signal. H : Normal audio playback.
84
PWM
O
PWM output for APC2. (Not used. (open))
85
E TAPE
O
L : Good tape.
86
N.C.
I
Not used. (open)
87
TX
Not used. (open)
88
VSS
GND.
89
VDD
UNSW 5V.
90
VDD
UNSW 5V.
91
NA SP
O
For normal audio. L : SP mode.
92
ENV GAIN
O
Video envelope gain change.
93
CTL STEP
O
CTL amp, STEP operation control.
94
CTL REC
O
H : CTL write.
95
V PB
O
Video system playback mode reversal. L : Playback.
96
CTL INDEX
O
Index control signal rewrite. H : Erase.
97
JOG
O
H : JOG
98
REC
O
Head amplifier recording power supply.
99
SP
O
L : SP mode.
100
AF SWP
O
AF switching pulse. (Not used. (open))
*1
signal
tape
good
normal
poor
RENTAL
L
L
H
E TAPE
L
H
H
*1. Selected by tape condition.
A
C
MA
H4
H3
YC
CA-53
(M903 CAM MOTOR)
(M903 CAM MOTOR)
CAPSTAN MOTOR
(M902)
(M902)
AC-101
TUNER
(TU102)
TUNER
(TU101)
F
YG-H3
4-3. PRINTED WIRING BOARDS AND
SCHEMATIC DIAGRAMS
Note:
•
All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F 50WV or less
are not indicated except for electrolytics and tantalums.
•
All electrolytics are in 50V unless otherwise specified.
•
All resistors are in ohms.
k
Ω
= 1000
Ω
, M
Ω
= 1000k
Ω
•
Indication of resistance, which does not have one for rating electrical
power, is as follows.
Pitch: 5 mm
Rating electrical power: 1/4W
•
1/4W in resistance, 1/10W and 1/8W in chip resistance.
•
: nonflammable resistor.
•
: fusible resistor.
•
Å¢
: internal component.
•
: panel designation and adjustment for repair.
•
All variable and adjustable resistors have characteristic curve B, unless
otherwise noted.
•
Readings are taken with a color-bar signal input.
•
Readings are taken with a 10M
Ω
digital multimeter.
•
Voltages are dc with respect to ground unless otherwise noted.
•
Voltage variations may be noted due to normal production tolerances.
•
All voltages are in V.
Åñ
: Measurement impossibillity.
•
: B + line.
•
: B – line.
(Actual measured value may be different).
•
: signal path. (RF)
•
Circled numbers are waveform reference.
•
Measurement mode.
no mark : REC/PB mode
( ) : REC mode
4-2. CIRCUIT BOARDS LOCATION
Reference information
RESISTOR
: RN
METAL FILM
: RC
SOLID
: FPRD
NONFRAMMABLE CARBON
: FUSE
NONFLAMMABLE FUSIBLE
: RW
NONFLAMMABLE WIREWOUND
: RS
NONFLAMMABLE METAL OXIDE
: RB
NONFLAMMABLE CEMENT
:
Ŷ
ADJUSTMENT RESISTOR
COIL
: LF-8L
MICRO INDUCTOR
CAPACITOR
: TA
TANTALUM
: PS
STYROL
: PP
POLYPROPYLENE
: PT
MYLAR
: MPS
METALIZED POLYESTER
: MPP
METALIZED POLYPROPYLENE
: ALB
BIPOLAR
: ALT
HIGH TEMPERATURE
: ALR
HIGH RIPPLE
Note: The symbol display is on the component side.
The components identified by shading and mark
are critical for safety. Replace only with part
number specified.
number specified.
The symbol indicate fast operating fuse.
Replace only with fuse of same rating as marked.
Replace only with fuse of same rating as marked.
Note: Les composants identifiés per un tramé et une
marque sont critiques pour la sécurité. Ne les
remplacer que par une piéce portant le numéro
spécifié.
remplacer que par une piéce portant le numéro
spécifié.
Le symbole indique une fusible a action
rapide. Doit etre remplacee par une fusible de
meme yaleur, comme maque.
rapide. Doit etre remplacee par une fusible de
meme yaleur, comme maque.
V
V
F2
– 92 –
NOTE:
• Items with no part number and no
• Items with no part number and no
description are not stocked because they
are seldom required for routine service.
are seldom required for routine service.
• The construction parts of an assembled
part are indicated with a collation number
in the remark column.
in the remark column.
• Items marked "
*
" are not stocked since
they are seldom required for routine
service. Some delay should be
anticipated when ordering these items.
service. Some delay should be
anticipated when ordering these items.
The componants identified by
shading and mark
shading and mark
are criti-
cal for safety.
Replace only with part number
specified.
Replace only with part number
specified.
Les composants identifies par
une trame et une marque
sont critiques pour la securite.
Ne les remplacer que par une
piece portant le numero specifie.
une trame et une marque
sont critiques pour la securite.
Ne les remplacer que par une
piece portant le numero specifie.
5-1.
PICTURE TUBE
: +BVTP 4X16
7-685-663-71
: +BVTP 3X12
7-685-648-79
REF. NO.
PART NO.
DESCRIPTION
REMARK
------------
-------------
-------------------
-------------
REF. NO.
PART NO.
DESCRIPTION
REMARK
------------
-------------
-------------------
-------------
1
X-4033-810-1 DOOR ASSY (21V4A/D/E)
2
X-4033-811-1 DOOR ASSY (21V4U)
2
X-4033-812-1 DOOR ASSY (21V4B)
2
2
3-703-035-11
SHAFT, LID
3
X-4033-806-1 BEZNET ASSY (21V4D)
4-13
X-4033-807-1 BEZNET ASSY (21V4A/E)
4-13
X-4033-808-1 BEZNET ASSY (21V4U)
4-13
X-4033-809-1 BEZNET ASSY (21V4B)
4-13
4
4-050-428-01
BUTTON, POWER
5
2-612-017-00
SPRING, COMPRESSION
6
4-050-430-01
GUIDE, LIGHT
7
4-050-431-01
BUTTON, EJECT
8
4-050-155-01
SPRING, FL
9
4-042-012-22
DOOR, CASSETTE
10
4-042-006-01
BUTTON, CONTROL
11
4-050-429-01
BUTTON, MULTI
12
4-919-393-51
DAMPER
13
4-050-432-01
FILTER, REMOTE
14
* 4-050-632-01
BRACKET, SP
15
* 4-050-631-01
CUSHION (B)
16
1-504-485-21
SPEAKER (8CM)
17
* 4-050-630-01
CUSHION (A)
18
* A-1372-251-A H3 BOARD, COMPLETE
19
4-042-018-21
BUTTON, SLIDE
20
8-738-787-71
ITC ASSY
21,25,38-41
21
4-036-190-01
SCREW (5), SELF TAPPING
22
4-369-318-21
SPRING, TENSION
23
* A-1331-560-A C BOARD, COMPLETE
24
1-900-900-22
LEAD ASSY, FOCUS
25
3-704-495-01
SPACER, DEFLECTION YOKE
26
1-406-828-11
COIL, DEGAUSSING
27
* 4-341-778-01
BAND, DEGAUSSING COIL
28
4-050-435-01
COVER, REAR
29
* A-1372-252-A H4 BOARD, COMPLETE
30
1-765-286-11
CORD, POWER (21V4A/B/D/E)
1-776-204-11
CORD, POWER (FILTER) (21V4U)
31
4-202-531-01
AC CORD LOCK (SC)
32
4-054-994-01
BUTTON, MAIN POWER
33
* A-1241-250-A F2 BOARD, COMPLETE
34
4-308-870-00
CLIP, LEAD WIRE
35
1-452-032-00
MAGNET, DISK ; 10mmø
36
1-452-094-00
MAGNET, ROTATABLE DISK ; 15mmø
37
4-051-736-21
PIECE A (90), CONV. CORRECT
38
1-452-277-00
MAGNET, BMC
39
8-738-784-05
PICTURE TUBE A51JXH61X
40
8-451-295-45
DEFLECTION YOKE Y21PFA2BA
41
1-775-044-11
CONNECTOR, DY (DOUBLE)
1
2
3
4
5
13
12
11
10
7
6
9
8
16
33
32
31
30
29
21
38
25
23
26
27
27
19
18
28
34
35
36
37
14
15
17
¡
¡
¡
¡
24
22
22
20
21
39
40
41
SECTION 5
EXPLODED VIEWS
– 93 –
5-2.
CHASSIS
: +BVTP 3X12
7-685-648-79
The componants identified by
shading and mark
shading and mark
are criti-
cal for safety.
Replace only with part number
specified.
Replace only with part number
specified.
Les composants identifies par
une trame et une marque
sont critiques pour la securite.
Ne les remplacer que par une
piece portant le numero specifie.
une trame et une marque
sont critiques pour la securite.
Ne les remplacer que par une
piece portant le numero specifie.
REF. NO.
PART NO.
DESCRIPTION
REMARK
------------
-------------
-------------------
-------------
REF. NO.
PART NO.
DESCRIPTION
REMARK
------------
-------------
-------------------
-------------
¡
¡
53
54
51
52
55
56
57
59
62
58
60
61
¡
¡
¡
¡
63
51
* A-1306-533-A MA BOARD, COMPLETE (21V4A/D/E/U)
* A-1306-535-A MA BOARD, COMPLETE (21V4B)
* A-1306-535-A MA BOARD, COMPLETE (21V4B)
52
* 3-960-067-11
HOLDER, MA
53
* 4-050-164-03
BRACKET, VTR
54
3-965-923-01
SPACER, RUBBER
55
* 3-691-950-01
SPACER, P.C.B
56
* 4-050-160-01
RAIL, GUIDE (L)
57
* 4-050-161-01
RAIL, GUIDE (R)
58
* A-1297-858-A A BOARD, COMPLETE (21V4A/D/E)
* A-1297-919-A A BOARD, COMPLETE (21V4U)
* A-1297-919-A A BOARD, COMPLETE (21V4U)
* A-1297-920-A A BOARD, COMPLETE (21V4B)
59
* 4-376-053-01
ANCHOR, PC BOARD
60
1-453-199-11
TRANSFORMER ASSY, FLYBACK
NX-1741//U2A
61
* A-1394-773-A YC BOARD, COMPLETE (21V4D)
* A-1394-819-A YC BOARD, COMPLETE (21V4A/E)
* A-1394-819-A YC BOARD, COMPLETE (21V4A/E)
* A-1394-820-A YC BOARD, COMPLETE (21V4U)
* A-1394-821-A YC BOARD, COMPLETE (21V4B)
* A-1394-821-A YC BOARD, COMPLETE (21V4B)
62
1-693-338-21
TUNER TU-VIF (21V4A/D/E)
1-693-339-21
TUNER TU-VIF (21V4U)
1-693-340-21
TUNER TU-VIF (21V4B)
63
1-693-338-21
TUNER TU-VIF (21V4A/D/E)
1-693-339-21
TUNER TU-VIF (21V4U)
1-693-340-21
TUNER TU-VIF (21V4B)
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