JVC GR-DVM90U Diagram
SECTION 4
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).
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.
REC mode
123
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.
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
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
1
Non-removable Board connector
2
3
1
2
4
Board to Board
3
5. Signal path Symbols
The arrows indicate the signal path as follows.
NOTE : The arrow is DVC unique object.
Playback 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.
Note: For g eneral information in service manual, please
refer to the Service Manual of GENERAL INFORMATION Edition 4 No. 82054D (January 1994).
S40889-01
Connected pattern on board
The arrows indicate signal path
7. Indication of the parts not mounted on the circuit board
“OPEN” is indicated by the parts not mounted on the circuit
board.
R216
OPEN
4-1
4-2
4-1 4-2
S40889-01
4.1 BOARD INTERCONNECTIONS
5
4
3
2
1
A
B
C
DEF
4-3
4-4
G
H
4.2 CPU SCHEMATIC DIAGRAM
5
4
NOTES: For the destination of each signal and further line connections that are cut off from
this diagram, refer to “4.1 BOARD INTERCONNECTIONS”.
When ordering parts, be sure to order according to the Part Number indicated in the Parts List.
According to the parts which have no values are not used.
3
2
1
A
B
C
DEF
4-5 4-6
G
H
4.3 MSD CPU SCHEMATIC DIAGRAM
5
4
NOTES: For the destination of each signal and further line connections that are cut off from
this diagram, refer to “4.1 BOARD INTERCONNECTIONS”.
When ordering parts, be sure to order according to the Part Number indicated in the Parts List.
According to the parts which have no values are not used.
3
2
1
A
B
C
DEF
4-7
4-8
G
H
4.4 A/HP SEL SCHEMATIC DIAGRAM
5
4
NOTES: For the destination of each signal and further line connections that are cut off from
this diagram, refer to “4.1 BOARD INTERCONNECTIONS”.
When ordering parts, be sure to order according to the Part Number indicated in the Parts List.
According to the parts which have no values are not used.
3
2
1
A
B
C
DEF
4-9
4-10
G
H
4.5 DVMAIN SCHEMATIC DIAGRAM
5
4
NOTES: For the destination of each signal and further line connections that are cut off from
this diagram, refer to “4.1 BOARD INTERCONNECTIONS”.
When ordering parts, be sure to order according to the Part Number indicated in the Parts List.
According to the parts which have no values are not used.
3
2
1
A
B
C
DEF
4-11 4-12
G
H
4.6 PHY SCHEMATIC DIAGRAM
5
4
NOTES: For the destination of each signal and further line connections that are cut off from
this diagram, refer to “4.1 BOARD INTERCONNECTIONS”.
When ordering parts, be sure to order according to the Part Number indicated in the Parts List.
According to the parts which have no values are not used.
3
2
1
A
B
C
DEF
4-13
4-14
G
H
4.7 DVEQ/DVANA SCHEMATIC DIAGRAM
5
4
NOTES: For the destination of each signal and further line connections that are cut off from
this diagram, refer to “4.1 BOARD INTERCONNECTIONS”.
When ordering parts, be sure to order according to the Part Number indicated in the Parts List.
According to the parts which have no values are not used.
3
2
1
A
B
C
DEF
4-15
4-16
G
H
4.8 PRE/REC SCHEMATIC DIAGRAM
5
4
NOTES: For the destination of each signal and further line connections that are cut off from
this diagram, refer to “4.1 BOARD INTERCONNECTIONS”.
When ordering parts, be sure to order according to the Part Number indicated in the Parts List.
According to the parts which have no values are not used.
3
2
1
A
B
C
DEF
4-17
4-18
G
H
4.9 VIDEO OUT SCHEMATIC DIAGRAM
5
4
NOTES: For the destination of each signal and further line connections that are cut off from
this diagram, refer to “4.1 BOARD INTERCONNECTIONS”.
When ordering parts, be sure to order according to the Part Number indicated in the Parts List.
According to the parts which have no values are not used.
3
2
1
A
B
C
DEF
4-204-19
G
H
4.10 CDS SCHEMATIC DIAGRAM
NOTES: For the destination of each signal and further line connections that are cut off from
this diagram, refer to “4.1 BOARD INTERCONNECTIONS”.
When ordering parts, be sure to order according to the Part Number indicated in the Parts List.
According to the parts which have no values are not used.
5
4
3
2
1
A
B
C
DEF
4-21 4-22
G
H
4.11 DSP SCHEMATIC DIAGRAM
5
4
NOTES: For the destination of each signal and further line connections that are cut off from
this diagram, refer to “4.1 BOARD INTERCONNECTIONS”.
When ordering parts, be sure to order according to the Part Number indicated in the Parts List.
According to the parts which have no values are not used.
3
2
1
A
B
C
DEF
4-23
4-24
G
H
4.12 TG/VDR SCHEMATIC DIAGRAM
5
4
NOTES: For the destination of each signal and further line connections that are cut off from
this diagram, refer to “4.1 BOARD INTERCONNECTIONS”.
When ordering parts, be sure to order according to the Part Number indicated in the Parts List.
According to the parts which have no values are not used.
3
2
1
A
B
C
DEF
4-25 4-26
G
H
4.13 REG CTL SCHEMATIC DIAGRAM
5
4
NOTES: For the destination of each signal and further line connections that are cut off from
this diagram, refer to “4.1 BOARD INTERCONNECTIONS”.
When ordering parts, be sure to order according to the Part Number indicated in the Parts List.
According to the parts which have no values are not used.
3
2
1
A
B
C
DEF
4-27
4-28
G
H
4.14 REGULATOR SCHEMATIC DIAGRAM
5
4
NOTES: For the destination of each signal and further line connections that are cut off from
this diagram, refer to “4.1 BOARD INTERCONNECTIONS”.
When ordering parts, be sure to order according to the Part Number indicated in the Parts List.
According to the parts which have no values are not used.
3
2
1
A
B
C
DEF
4-29 4-30
G
H
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