JVC KVV-8 Schematic
SECTION 4
24
C331
11/10
22201816
WF25
C329
0.1/50
C330
0.1/50
R344
47K
R343
18K
R345
10K
R346
15K
Measurement point
Waveform number
CHARTS AND DIAGRAMS
NOTES OF SCHEMATIC DIAGRAM
Safety precautions
The Components identified by the symbol are
critical for safety. For continued safety, replace safety
critical components only with manufacturer's recommended parts.
1. Units of components on the schematic diagram
Unless otherwise specified.
1) All resistance values are in ohm, 1/6 W, 1/8 W (refer to
parts list).
Chip resistors are 1/16 W.
K or k: k (1000 ), M: M (1000k )
2) All capacitance values are in µF, (P: PF).
3) All inductance values are in µH, (m: mH).
4) All diodes are 1SS133, MA165 or 1N4148M (refer to parts
list).
2. Indications of control voltage
AUX : Active at high
AUX or AUX(L) : Active at low
3. Interpreting Connector indications
1
2
Removable connector
3
1
2
Wire soldered directly on board
3
4) Indication on schematic diagram
Voltage Indications for REC and PB mode on the schematic diagram are as shown below.
REC mode
12 3
2.5
(5.0)
PB mode
1.8
PB and REC modes
(Voltage of PB and REC modes
are the same)
Note: If the voltages are not indicated on the schematic
diagram, refer to the voltage charts.
5. Waveform measurement
1) Video circuits
REC : Colour bar signal in SP mode, normal VHS mode
PB : Alignment tape, colour bar SP mode, normal VHS
mode
2) Audio circuits
REC : 1KHz, –8 dBs sine wave signal in SP mode, normal
VHS mode
PB : REC then playback it
3) Movie Camera circuits
Measured using a correctly illuminated gray scale or colour
bar test chatrs in the E-E mode
4) Indication on schematic diagram
Waveform indications on the schematic diagram are as
shown below.
1
Non-removable Board connector
2
3
1
2
4
Board to Board
3
Connected pattern on board
The arrows indicate signal path
4. Voltage measurement
1) Video circuits
REC : Colour bar signal in SP mode, normal VHS mode
PB : Alignment tape, colour bar SP mode, normal VHS
mode
— : Unmeasurable or unnecessary to measure
2) Audio circuits
REC : 1KHz, –8 dBs sine wave signal in SP mode, Nor-
mal VHS mode
PB : REC then playback it
3) Movie Camera circuits
Measured using a correctly illuminated gray scale or colour
bar test charts in the E-E mode
5) Waveform indications
Waveform number
WF25
REC/PB 1.2 Vp-p
50 mV/2 msec/DIV
Oscilloscope Volts and Time/Division, Probe 10 : 1
Mode : REC or PB modes
Waveform name or
measurement point
ALC OUT
Level : 1.2 Vp-p
4-1
6. Signal path Symbols
The arrows indicate the signal path as follows.
Playback signal path
Playback and recording signal path
Recording signal path
(including E-E signal path)
Capstan servo path
CIRCUIT BOARD NOTES
1. Foil and Component sides
1) Foil side (B side) :
Parts on the foil side seen from foil face (pattern face)
are indicated.
2) Component side (A side) :
Parts on the component side seen from component face
(parts face) indicated.
Drum servo path
(Example)
R-Y
Playback R-Y signal path
Y
Recording Y signal path
7. Indication of the parts for adjustments
The parts for the adjustments are surrounded with the circle as
shown below.
8. Indication of the parts not mounted on the circuit board
“OPEN” is indicated by the parts not mounted on the circuit
board.
R216
OPEN
2. Parts location guides
Parts location are indicated by guide scale on the circuit board.
REF No. LOCATION
Category: IC
Horizontal “A” zone
Vertical “6” zone
(A : Component side)
(D : Discrete component)
B : Foil side
C : Chip component
IC
IC101 B C 6 A
Note:
For general information in service manual, please refer
to the Service Manual of GENERAL INFORMATION Edition 4 No. 82054D (January 1994).
4-2
4.1 BOARD INTERCONNECTIONS
5
)
A
(
(
ENABLE MOD OUT
Page 4-13
)
4
(
VIDEO/AUDIO Page 4-5
(
SYSCON Page 4-7
(
SW.REG Page 4-9
(
TERMINAL Page 4-11
)
)
)
)
3
CAP CTL V
2
LP/EP LP/EP
1
p20175001a rev0
ABCD EFGH
4-3 4-4
4.2 MAIN(VIDEO/AUDIO)SCHEMATIC DIAGRAM
The Parts Number,value and rated voltage etc. in the Schematic Diagram are for references only.
Note :
When replacing the parts,refer to the Parts List.
TO TERMINAL
MAIN(VIDEO/AUDIO
)
5
TO SW.REG
4
TO U.DRUM
HIFI MODEL HIFI MODEL
3
TO A/C HEAD
CN1
P/R
TO SYSCON
0
0
0
2
TO SYSCON
TO SW.REG
TO SYSCON
1
: Used
: Not used
JCP8020-MSD-2
4-5 4-6
p10294001a rev1.1
HGFEDCBA
4.3
MAIN(SYSCON)SCHEMATIC DIAGRAM
The Parts Number,value and rated voltage etc. in the Schematic Diagram are for references only.
Note :
When replacing the parts,refer to the Parts List.
TO SW.REG
0
5
TO CAP MDA
MONITOR 12V
TO DRUM MOTOR
SHORT
TO TERMINAL
OPEN
4
TO FRONT
CN7001
TO LOADING MOTOR
3
TO ROTARY ENCORDER
2.2
0
0
2
0
0
0
TO DEW SENSOR
0
TO VIDEO/AUDIO
1
: Used
: Not used
p10295001a rev1.1
ABCD EFGH
4-7 4-8
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