JVC GR-DVF31s Service Manual
SECTION 4
123
2.5
(5.0)
1.8
PB and REC modes
(Voltage of PB and REC modes
are the same)
PB mode
REC mode
CHARTS AND DIAGRAMS
NOTES OF SCHEMATIC DIAGRAM
Safety precautions
The Components identified by the symbol are
critical for safety. For continued safety, replace saf ety
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: KΩ (1000Ω), M: MΩ (1000KΩ)
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.
4. Voltage measurement
1) Regulator (DC/DC CONV) circuits
REC : Colour bar signal.
PB : Alignment tape (Colour bar).
— : Unmeasurable or unnecessary to measure.
4) Indication on schematic diagram
Voltage Indications for REC and PB mode on the schematic diagram are as shown below.
Note: If the voltages are not indicated on the schematic
diagram, refer to the voltage charts.
5. Signal path Symbols
The arrows indicate the signal path as follows.
NOTE : The arrow is DVC unique object.
Playback signal path
3. Interpreting Connector indications
1
2
Removable connector
3
1
2
Wire soldered directly on board
3
1
Non-removable Board connector
2
3
1
2
4
Board to Board
3
Connected pattern on board
The arrows indicate signal path
Playback and recording signal path
Recording signal path
(including E-E signal path)
Capstan servo path
Drum servo path
(Example)
R-Y
Playback R-Y signal path
Y
Recording Y signal path
6. Indication of the parts for adjustments
The parts for the adjustments are surrounded with the circle as
shown below.
7. Indication of the parts not mounted on the circuit board
“OPEN” is indicated by the parts not mounted on the circuit
board.
S40889-01
R216
OPEN
4-1
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.
2. Parts location guides
Parts location are indicated by guide scale on the circuit board.
LOCATION
IC
Category : IC
Horizontal “A” zone
Vertical “6” zone
(A : Component side)
D : Discrete component)
B : Foil side
C : Chip component
REF No.
IC101 B C 6 A
Note: For g eneral information in service manual, please
refer to the Service Manual of GENERAL INFORMATION Edition 4 No. 82054D (January 1994).
4-2
S40889-01
4.1 BOARD INTERCONNECTIONS
5
5
4
4
3
3
2
2
1
1
A
`
B
B
C
C
DEF
DEF
4-3
4-4
G
G
H
H
4.2 JACK AND VF IF SCHEMATIC DIAGRAMS
5
5
4
4
NOTE: When ordering parts, be sure to order according to
the Part Number indicated in the Parts List.
3
3
2
2
1
1
A
`
B
B
C
C
DEF
DEF
4-5
4-6
G
G
H
H
4.3 SYSCON SCHEMATIC DIAGRAM
5
4
NOTE: When ordering parts, be sure to order according to
the Part Number indicated in the Parts List.
3
2
1
A
B
C
DEF
4-7 4-8
G
H
4.4 DECK CPU SCHEMATIC DIAGRAM
5
4
NOTE: When ordering parts, be sure to order according to
the Part Number indicated in the Parts List.
3
2
1
A
B
C
DEF
4-9 4-10
G
H
4.5 DV DSP SCHEMATIC DIAGRAM
5
4
NOTE: When ordering parts, be sure to order according to
the Part Number indicated in the Parts List.
3
2
1
A
B
C
DEF
4-11
4-12
G
H
4.6 DV EQ SCHEMATIC DIAGRAM
5
4
NOTE: When ordering parts, be sure to order according to
the Part Number indicated in the Parts List.
3
2
1
A
B
C
DEF
4-13 4-14
G
H
4.7 AV OUT SCHEMATIC DIAGRAM
5
5
4
4
NOTE: When ordering parts, be sure to order according to
the Part Number indicated in the Parts List.
3
3
2
2
1
1
`
A
B
B
C
C
DEF
DEF
4-15
4-16
G
G
H
H
4.8 CAMERA DSP SCHEMATIC DIAGRAM
5
4
NOTE: When ordering parts, be sure to order according to
the Part Number indicated in the Parts List.
3
2
1
A
B
C
DEF
4-17
4-18
G
H
4.9 IRIS & AF/ZOOM SCHEMATIC DIAGRAM
5
4
NOTE: When ordering parts, be sure to order according to
the Part Number indicated in the Parts List.
3
2
1
A
B
C
DEF
4-19 4-20
G
H
4.10 TG CDS SCHEMATIC DIAGRAM
5
4
NOTE: When ordering parts, be sure to order according to
the Part Number indicated in the Parts List.
3
2
1
A
B
C
DEF
4-21 4-22
G
H
4.11 REGULATOR SCHEMATIC DIAGRAM
5
4
NOTE: When ordering parts, be sure to order according to
the Part Number indicated in the Parts List.
3
2
1
A
B
C
DEF
4-23
4-24
G
H
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