JVC GR-AX640U, GR-AX840U Service Manual
COMPACT VHS CAMCORDER
GR-AX640U/AX840U
Regarding service information other than these sections, refer to the GR-AX940U service manual (No. 86446).
Also, be sure to note important safety precautions provided in the service manual.
SPECIFICATIONS
( The specifications shown pertain specifically to the model GR-AX840U)
Camcorder
General
Format : VHS NTSC standard
Power source : DC 6.0 V
Power consumption : 5.4 W
Signal system : NTSC-type
Video recording system
Luminance : FM recording
Color : Converted sub-carrier
Cassette :
Tape speed
SP : 33.35 mm/sec. (1-5/16 ips)
EP : 11.12 mm/sec. (7/16 ips)
Recording time (max.)
SP : 40 minutes
EP : 120 minutes (with TC-40)
Operating temperature
Operating humidity : 35% to 80%
Storage temperature : –20°C to 50°C (–4°F to 122°F)
Weight : Approx. 710 g (1.6 lbs)
Dimensions : 91 (W) x 119 (H) x 198 (D) mm
Pickup : 1/4” format CCD
Lens: F1.6, f = 3.9 to 62.4 mm, 16:1
Viewfinder : Electronic viewfinder
White balance
adjustment : Auto/Manual adjustment
direct recording
Conforms to VHS standard
cassette
:0°C to 40°C (32°F to 104°F)
(3-8/5" x 4-11/16" x 7-13/16")
(with the viewfinder fully tilted
downward)
power zoom lens with auto iris
and macro control, filter
diameter 40.5 mm
with 0.55” color LCD
COPYRIGHT © 1999 VICTOR COMPANY OF JAPAN, LTD.
Connectors
JLIP : ø3.5 mm, 4-pole, mini-head
Video : 1 Vp-p, 75 Ω unbalanced,
Audio : –8 dBs, 1 kΩ analog output
jack
(compatible with RC-5325 plug)
analog output
(via Video output connector)
(via Audio output connector)
AC Power Adapter/Charger AA-V15U
Power requirement
U.S.A. and Canada : AC 120 V`, 60 Hz
Other countries : AC 110 V to 240 V`, 50/60
Hz
Power consumption : 23 W
Output
Charge : DC 8.5 V
VTR : DC 6.3 V
Charging system : Constant current, peak
detection, timer controlled
Dimensions : 140 (W) x 42 (H) x 68 (D) mm
(5-9/16” x 1-11/16” x 2-11/16”)
Weight : Approx. 300 g (0.71 lbs)
, 1.3 A
, 1.8 A
Cassette Adapter C-P7U
Dimensions : 188 (W) x 25 (H) x 104 (D) mm
Weight : Approx. 240 g (0.53 lbs)
Accessory : “AA (R6)”-size battery x 1
(7-7/16” x 1” x 4-1/8”)
Provided Accessories
Optional Accessories
• Battery Packs BN-V12U, BN-V20U, BN-V856U
• Car Battery Charger BH-V3U
• Battery Charger BH-VC10U
• Car Battery Cord AP-V7U
• Compact VHS-C Cassettes TC-40/30/20
• Active Carrying Bag CB-V7U
• Audio/Video Cable
• JLIP-to-PC Cable VC-VJ49WU
• JLIP Video Producer
• Brush Kit
Some accessories are not available in some areas. Please
consult your nearest JVC dealer for details on accessories
and their availability.
Specifications shown are for SP mode unless otherwise
indicated. E & O.E. Design and specifications subject to
change without notice.
Z
pg. 6
No. 86447
January 1999
TABLE OF CONTENTS
3. ELECTRICAL ADJUSTMENT
3.1 ELECTRICAL ADJUSTMENT ..................................................................................................................................... 3-1
3.2 ELECTRONIC VIEWFINDER (E. VF) ADJUSTMENT (For GR-AX640U/UC) ............................................................3-3
4. CHARTS AND DIAGRAMS
4.1 BOARD INTERCONNECTIONS .................................................................................................................................4-3
4.2 CPU SCHEMATIC DIAGRAM.....................................................................................................................................4-5
4.6 Y/C & AUDIO SCHEMATIC DIAGRAM ..................................................................................................................... 4-11
4.10 REGULATOR SCHEMATIC DIAGRAM .................................................................................................................... 4-19
4.11 LCD CTL SCHEMATIC DIAGRAM............................................................................................................................4-22
4.12 MAIN CIRCUIT BOARD............................................................................................................................................ 4-23
4.17 POWER SYSTEM BLOCK DIAGRAM...................................................................................................................... 4-37
4.23 ELECTRONIC VIEWFINDER SCHEMATIC DIAGRAM (For AX640U/UC) .............................................................. 4-55
4.24 ELECTRONIC VIEWFINDER CIRCUIT BOARD (For AX640U/UC).........................................................................4-57
5. PARTS LIST
5.6 ELECTRONIC VIEWFINDER ASSEMBLY <M4> [GR-AX640U/UC] ........................................................................ 5-19
5.5 ELECTRICAL PARTS LIST
E.VF BOARD ASSEMBLY (GR-AX640U/UC) <60>..................................................................................................5-18
The following table indicate main different points between models GR-AX940U, AX940UC, AX840U, AX840UC, AX640U
and GR-AX640UC.
MODEL
ITEM
VIEW FINDER Color Black/White
CASSETTE COVER Black Dark Glay
DC LIGHT
Note: Mark – is not used. Mark Q is used. Mark is same as left.
GR-AX940U GR-AX940UC GR-AX840U GR-AX840UC GR-AX640U GR-AX640UC
QQ
– – – –
The following table indicate different parts number between models GR-AX940U, AX940UC, AX840U, AX840UC, AX640U and
GR-AX640UC.
P ACKING ASSEMBLY <M1>
REF No.
5 INST. BOOK (EN) LYT0259-001A LYT0251-001A LYT0255-001B
14 INST. BOOK (FR) – LYT0321-001A – LYT0286-001A – LYT0286-001A
ITEM
2 PACKING CASE LY30905-018A LY30905-039A LY30905-011A LY30905-021A LY30905-017A LY30905-020A
7 REGIST. CARD BT-51006-1 – BT-51006-1 – BT-51006-1 –
13 WARRANTY CARD – BT-52002-1 – BT-52002-1 – BT-52002-1
15 SER. NET CARD – BT-20071B – BT-20071B – BT-20071B
MODEL
GR-AX940U GR-AX940UC GR-AX840U GR-AX840UC GR-AX640U GR-AX640UC
FINAL ASSEMBL Y <M2>
REF No.
101 LOWER CASE ASSY LY10122-009B LY10122-008B
106 FRONT COVER ASSY LY10124-010C LY10124-005C LY10124-005D LY10124-004C
106R COVER (LIGHT) – – LY30934-004A LY30934-003A
107 CASSETTE COVER ASSY LY10126-002A LY10126-001A
108 BUTTON (PUSH) ASSY LY30899-002B LY30899-002B LY30899-001B
110 TOP COVER LY10129-016B LY10129-009B LY10129-015B
116 DC LIGHT ASSY LY30860-001A ––––
116A LAMP YQ44266 ––––
137 FRAME ASSY LY20372-001A L Y20372-002A
137F CONTACT (LIGHT),X2 YQ43810 ––––
137G E-SI C WIRE C-F WJM0003-003A ––––
146 KNOB (LIGHT) LY41083-001B ––––
ITEM
MODEL
GR-AX940U GR-AX940UC GR-AX840U GR-AX840UC GR-AX640U GR-AX640UC
ELECTRONIC VIEWFINDER ASSEMBLY <M4>
REF No.
360 EVF ASSY L YH20038-002A ––
381 EVF ASSY – – – – LY20374-001A
ITEM
MODEL
MAIN BOARD ASSEMBLY <01>
REF No.
PW MAIN BOARD ASSY YB10243UC-01 YB10243UB-02 YB10243UA-02
IC3103 IC – – – – NJM2535V
IC4006 IC
IC6002 IC MM1257AM ––
IC7101 IC (DIGITAL) TC7SET02FU ––
IC7102 IC (DIGITAL) TC7SET08FU ––
Q2061 TRANSISTOR 2SC4617/QR/-X –––`–
ITEM
MODEL
Note: Mark – is not used. Mark is same as left.
GR-AX940U GR-AX940UC GR-AX840U GR-AX840UC GR-AX640U GR-AX640UC
GR-AX940U GR-AX940UC GR-AX840U GR-AX840UC GR-AX640U GR-AX640UC
TMS4C2973-28-X
––––
REF No.
Q2062 TRANSISTOR 2SC4617/QR/-X ––––
Q3106 PAIR TRANSIST OR HN1B01FU/G/-X ––
Q6201 TRANSISTOR 2SD1628/FG/-X ––––
Q6202 TRANSISTOR 2SA1774/QR/-X ––––
Q6203 TRANSISTOR 2SC4617/QR/-X ––––
D7101 SB DIODE RB715F ––
R142 MG RESISTOR – – – – NRSA63J-273X
R143 MG RESISTOR – – – – NRSA63J-393X
R144 MG RESISTOR NRSA63J-0R0X NRSA63J-153X
R501 MG RESISTOR NRSA63J-105X ––––
R2061 MG RESISTOR NRSA63J-103X ––––
R2062 MG RESISTOR NRSA63J-104X ––––
R2063 MG RESISTOR NRSA63J-104X ––––
R2064 MG RESISTOR NRSA63J-104X ––––
R2065 MG RESISTOR NRSA63J-183X NRSA63J-0R0X
R3125 MG RESISTOR – – – – NRSA63J-562X
R3126 MG RESISTOR – – – – NRSA63J-472X
R3127 MG RESISTOR – – – – NRSA63J-472X
R3128 MG RESISTOR – – – – NRSA63J-272X
R3132 MG RESISTOR NRSA63J-222X ––
R3134 MG RESISTOR NRSA63J-222X ––
R6201 MG RESISTOR NRSA63J-103X ––––
R6202 MG RESISTOR NRSA63J-103X ––––
R6203 MG RESISTOR NRSA63J-103X ––––
R6204 MG RESISTOR NRSA63J-103X ––––
R6205 MG RESISTOR NRSA63J-100X ––––
R6206 MG RESISTOR NRSA63J-102X ––––
R7102 MG RESISTOR NRSA63J-0R0X ––
R7103 MG RESISTOR NRSA63J-563X ––
R7106 MG RESISTOR NRSA63J-0R0X ––
R7107 MG RESISTOR NRSA63J-101X ––
R7108 CMF RESISTOR NRVA63D-182X ––
R7109 MG RESISTOR NRSA63J-0R0X ––
R7111 CMF RESISTOR NRVA63D-332X ––
R7112 CMF RESISTOR NRVA63D-561X ––
R7113 MG RESISTOR NRSA63J-0R0X ––
R7115 MG RESISTOR NRSA63J-0R0X ––
C2061 CAPACITOR NCB21EK-104X ––––
C2062 CAPACITOR NCF21CZ-105X ––––
C3107 CAPACTIOR – – – – NCB21AK-105X
C3108 CAPACITOR – – – – NCB31EK-103X
ITEM
MODEL
GR-AX940U GR-AX940UC GR-AX840U GR-AX840UC GR-AX640U GR-AX640UC
Note: Mark – is not used. Mark is same as left.
REF No.
C4037 CAPACITOR NCF31EZ-104X ––––
C4038 CAPACITOR NCF31EZ-104X ––––
C6051 CAPACITOR NCB11CK-105X ––
C6052 T CAPACITOR NBP41DM-475X ––
C6053 CAPACITOR NCB11CK-105X ––
C6201 E CAPACITOR NEA71CM-106X ––––
C7101 CAPACITOR NCF31CZ-104X ––
C7102 CAPACITOR NCF31CZ-104X ––
C7103 CAPACITOR NCB31HK-102X ––
C7105 CAPACITOR NDC31HJ-270X ––
C7108 T CAPACTIOR NBE40JM-226X ––
C7112 T CAPACITOR NBE20JM-106X ––
L7101 COIL NQL144K-100X ––
L7103 COIL NQL144K-100X ––
SW503 SLIDE SWITCH NSW0092-001X ––––
CN11 FPC CONNECTOR QGF0507F1-20X ––
CN12 CONNECTOR – – – –
CN14 CONNECTOR
F6004 MG RESISTOR/FUSE NRSA02J-0R0X
F7101 FUSE
ITEM
MODEL
GR-AX940U GR-AX940UC GR-AX840U GR-AX840UC GR-AX640U GR-AX640UC
QGA1201F2-05X
QGA1201C2-02X
NMFZ006-R20X-K
––––
NMFZ006-R50X-K
––
BL BOARD ASSEMBLY <06>
REF No.
PW2 BL BOARD ASSY YB20838B2-01 ––
ITEM
MODEL
GR-AX940U GR-AX940UC GR-AX840U GR-AX840UC GR-AX640U GR-AX640UC
VF BOARD ASSEMBLY <10>
REF No.
PW1 VF BOARD ASSY YB20838B1-01 ––
ITEM
MODEL
GR-AX940U GR-AX940UC GR-AX840U GR-AX840UC GR-AX640U GR-AX640UC
E. VF BOARD ASSEMBLY <60>
REF No.
PW VF BOARD ASSY – – – – LY41289-001A
ITEM
MODEL
GR-AX940U GR-AX940UC GR-AX840U GR-AX840UC GR-AX640U GR-AX640UC
Note: Mark – is not used. Mark is same as left.
SECTION 3
ELECTRICAL ADJUSTMENT
3.1 ELECTRICAL ADJUSTMENT
3.1.1 PREPARATION
1. Precaution
This model does not contain adjustment controls (VR).
General deck system, camera system and monitor system
adjustment are not required. However, if MAIN board need
replacement, please use original E2PROM on to new board.
Then adjustment are not required. And if parts such as the
following need replacement, special computerized adjustment are required (Refer to sec. 3.1.1-4). Please contact to
JVC Service for detaile information.
• OP block
• E2PROM (IC105 of MAIN board)
In the event of malfunction with electrical circuits, troubleshooting with the aid of proper test instruments most be
done first, and then commence necessary repair, replacement and adjustment, etc.
1. In case of wiring to chip test points for measurement, use
IC clips, etc. to avoid any stress.
2. Since connectors are fragile, carefully handle them in
disconnecting and connecting.
3. Shortcircuit between operation un it and DECK chassis.
2. Required test equipment
1. Color TV monitor.
2. AC power adapter
3. Oscilloscope (dual-trace type, observable 100 MHz or
higher frequency)
* It is recommended to use one observable 300 MHz or
higher frequency.
4. Digital voltmeter
5. Frequency counter (with threshold level adjuster)
6. Personal computer
3. Required adjustment tools
For detsails of special jigs necessary for adjustment, refer to
page 1-2 and 1-3 of the Section 1.
4. Setup for E. VF section adjustment
(For GR-AX640U/UC)
Referring to “SEC. 1 DISASSEMBLY” and connect the E.VF
WIRE to CN12 of the MAIN board.
Note:
•
This adjustment falls into a special adjustment that requires
a personal computer.
For details, refer to “3.1.1 Preparation”.
(LY20374)
SERIAL NO.
Bottom case assy
Parts NO.
LY20374
Adjustment ltem : 3.2
LABEL
SCREW
REW
FF
STOP
PLAY/PAUSE
MENU/
DISPLAY
PUSH
EJECT
<Rear side>
Fig. 3-1-1 Connection for Service support system
3-1
SP/EP
Service Support
System software
J
JLIP
RS232C
COM Port
MENU
PC CABLE
QAM0099-002
Personal Computer
3.2 ELECTRONIC VIEWFINDER (E. VF) ADJUSTMENT
(For GR-AX640U/UC)
Notes:
•
Unless otherwise specified, all measurement points and
adjustment parts are located on E. VF board.
•
After adjustment or replacement of the deflection yoke or
the centering magnet, fix it by the band as shown the figure
below.
TOP VIEW
CENTERING
CRT
MAGNET
STOPPER
Fig. 3-2-1 E. VF
•
After adjustment is completed, compare the picture on the
E. VF screen with the monitor TV.
CENTERING
CRT
MAGNET
STOPPER
F.B.T
Fig. 3-2-2 E. VF
VR7003
CN7001
FOCUS
T7001
VR7002
BRIGHT
CN7002
60E. VF PWB ASSY
VR7001
V. SIZE
1) Put the deflection yoke to the most inner side of CRT neck
first. Then fix the stopper temporary.
2) Adjust the tilt of picture on the E. VF screen by tilting the
deflection yoke.
3) Fix the stopper completely.
3.2.2 Centering
Subject • Alignment tape
• Stairstep
Mode • PB
Equipment • E. VF
Measurement point • E. VF screen
Adjusting part • Centering magnet (CRT assy)
Specification • The center of the E. VF screen
1) While observing the viewfinder screen, adjust the centering
magnet to locate the stairstep in the center of the viewfinder screen.
3.2.3 Vertical scanning
Subject • Camera picture
Mode • EE
Equipment • E. VF
Measurement point • E. VF screen
Adjusting part • VR7001 (V. SIZE)
Specification • Normal picture amplitude
1) Observing the viewfinder screen, adjust VR7001 for
normal picture amplitude.
3.2.4 Brightness
Subject • –
Mode • EE
• Lens closed
Equipment • E. VF
Measurement point • E. VF screen
Adjusting part • VR7002 (BRIGHT)
Specification • The CRT raster is just barely
visible
1) Close the lens with the cap and adjust VR7002 so that
the raster of the CRT is just visible in the E. VF.
Fig. 3-2-3 E. VF board
3.2.1 Tilt
Subject • Alignment tape
• Stairstep
Mode • PB
Equipment • E. VF
Measurement point • E. VF screen
Adjusting part • Deflection yoke
Specification • The picture is visible as
same as monitor TV.
3.2.5 Focus
Subject • Camera picture
Mode • EE
Equipment • E. VF
Measurement point • E. VF screen
Adjusting part • VR7003 (FOCUS)
Specification • The center area is clear and
defined
1) While observing the viewfinder screen, adjust VR7003
so that the picture at the central area of the screen is
clear and defined.
3-3
4.1 BOARD INTERCONNECTIONS
5
4
SECTION 4
CHARTS AND DIAGRAMS
3
2
1
A
4-3
B
C
D
EF
G
H
4-4
4.2 CPU SCHEMATIC DIAGRAM
5
4
3
2
1
A
4-5
B
C
D
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