JVC GR-FX12EG, GR-SX202EG, GR-SX22EG/EK Schematics
SECTION 4
REF No. LOCATION
IC
Category: IC
Horizontal “A” zone
Vertical “6” zone
B : Foil side
(A : Component side)
C : Chip component
(D : Discrete component)
IC101 B C 6A
CHARTS AND DIAGRAMS
NOTES OF SCHEMA TIC 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: 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
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
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.
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.
24
22201816
Measurement point
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
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
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.
Note:
For general information in service manual, please refer
to the Service Manual of GENERAL INFORMA TION Edition 4 No. 82054D (January 1994).
4. Voltage measurement
1) Video circuits
2) Audio circuits
3) Movie Camera circuits
S40884-03
1
Non-removable Board connector
2
3
1
2
4
Board to Board
3
Connected pattern on board
The arrows indicate signal path
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
REC : 1KHz, –8 dBs sine wave signal in SP mode, Nor-
mal VHS mode
PB : REC then playback it
Measured using a correctly illuminated gray scale or colour
bar test charts in the E-E mode
C329
C330
0.1/50
R344
47K
R343
18K
0.1/50
C331
11/10
R345
10K
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
WF25
R346
15K
ALC OUT
Waveform number
Waveform name or
measurement point
Level : 1.2 Vp-p
4-1 4-2
4-1
4-2
OPEN
S40884-03
4.1 BOARD INTERCONNECTIONS
OPEN
NOTE)* : The nimber of patch cords are indicated by interconnected.
OPEN
(Page 4-21)
(Page 4-11)
(Page 4-27)
(Page 4-13)
(Page 4-24)
(Page 4-15)
(Page 4-25)
(Page 4-26)
(Page 4-26)
(Page 4-19)
(Page 4-17)
OPEN
(Page 4-7)
(Page 4-23)
(Page 4-5)
(Page 4-9)
OPEN
OPEN
(Page 4-25)
4-3 4-4
4.2 CPU SCHEMATIC DIAGRAM
(OPEN)
NOTE: • For the destination of each singnal 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.
(OPEN)
(OPEN)
(OPEN)
(OPEN)
NOTES : 1. THE PARTS WITH MARKED ( ) IS NOT USED.
2. For CPU waveforms, please refer to page 4-49.
(OPEN)
(OPEN)
(OPEN)
(OPEN)
4-5 4-6
4.3 VTR ASP SCHEMATIC DIAGRAM
NOTE: • For the destination of each singnal 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.
NOTES : 1. THE PARTS WITH MARKED ( ) IS NOT USED.
2. For VTR ASP waveforms, please refer to page 4-49.
(OPEN)
4-7 4-8
4.4 MECHA MDA SCHEMATIC DIAGRAM
NOTE: • For the destination of each singnal 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.
NOTES : 1. THE PARTS WITH MARKED ( ) IS NOT USED.
2. For MECHA MDA waveforms, please refer to page 4-49.
4-9 4-10
4.5 VTR DSP SCHEMATIC DIAGRAM
NOTE: • For the destination of each singnal 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.
NOTES : 1. THE PARTS WITH MARKED ( ) IS NOT USED.
2. For VTR DSP waveforms, please refer to page 4-49.
4-11 4-12
4.6 DSP SCHEMATIC DIAGRAM
NOTE: • For the destination of each singnal 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.
(OPEN)
NOTES : 1. THE PARTS WITH MARKED ( ) IS NOT USED.
2. For DSP waveforms, please refer to page 4-49.
4-13 4-14
4.7 IRIS & AF/ZOOM SCHEMATIC DIAGRAM
NOTE: • For the destination of each singnal 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.
4-15 4-16
4.8 VIDEO OUT SCHEMATIC DIAGRAM
NOTE: • For the destination of each singnal 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.
NOTES : 1. THE PARTS WITH MARKED ( ) IS NOT USED.
2. For VIDEO OUT waveforms, please refer to page 4-49.
4-17 4-18
4.9 REGULATOR SCHEMATIC DIAGRAM
NOTE: • For the destination of each singnal 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.
4-19 4-20
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