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SERVICE MANUAL
No.86611
January 2001
GR-AX777UM,SX877UM
SPECIFICATIONS
COMPACT VHS CAMCORDER
Regarding service information other than these sections, refer to the GR-AX760U service manual (No.86596).
Also, be sure to note important safety precautions provided in the service manual.
Connectors
Video
: 1 V (p-p), 75 unbalanced,
analog output
(via Video output connector)
Audio
: 300 mV (rms), 1 k
analog
output
(via Audio output connector)
S-Video
: Y : 1 V (p-p), 75 ,
analog output
C : 0.29 V (p-p), 75 ,
analog output
AC Adapter AP-V10U
Power requirement
: AC 110 V to 240 V`,
50 Hz/60 Hz
Output
: DC 11 V
, 1 A
Dimensions
: 59 mm x 31 mm x 69 mm
(W x H x D)
(2-3/8" x 1-1/4" x 2-3/4")
Weight
: Approx. 130 g (0.29 lbs)
Optional Accessories
· Battery Packs BN-V12U, BN-V20U, BN-V400U
· A/V (Audio/Video) Cable
· S-Video Cable QAM0004-004
· Compact S-VHS (
) Cassettes ST-C-40/30/20
· Compact VHS (
) Cassettes TC-40/30/20
· Active Carrying Bag CB-V7U
Camcorder
General
Format
: S-VHS (GR-SXM747UM/
SXM347UM/SXM247UM/
SX877UM only)/VHS NTSC
standard
Power source
: DC 11 V
(Using AC Adapter)
DC 6 V
(Using battery pack)
Power consumption
Viewfinder on
: 4.0 W (GR-SXM747UM/
SXM347UM/SXM247UM only)
3.7 W (GR-SX877UM/
AX777UM only)
LCD monitor* on
: 4.5 W (GR-SXM747UM/
SXM347UM/SXM247UM only)
Video light**
: 3.0 W
* Models equipped with LCD monitor only.
** GR-SXM747UM/SXM347UM/SXM247UM/SX877UM
only.
Signal system
: NTSC-type
Video recording system
Luminance
: FM recording
Color
: Converted sub-carrier
direct recording
Conforms to VHS standard
Cassette
:
/
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
:0
°C to 40°C (32°F to 104°F)
Operating humidity
: 35% to 80%
Storage temperature
: ­20
°C to 50°C
(­4
°F to 122°F)
Some accessories are not available in some areas. Please
consult your nearest JVC dealer for details on accessories
and their availability.
(GR-SXM747UM/
SXM347UM/SXM247UM/
SX877UM only)
Specifications shown are for SP mode unless otherwise indicated. E & O.E. Design and specifications subject to change
without notice.
Weight
: Approx. 910 g (2.0 lbs)
(GR-SXM747UM only)
Approx. 900 g (2.0 lbs)
(GR-SXM347UM/SXM247UM
only)
Approx. 730 g (1.6 lbs)
(GR-SX877UM only)
Approx. 720 g (1.6 lbs)
(GR-AX777UM only)
Dimensions
: 206 mm x 112 mm x 118 mm
(W x H x D)
(8-1/8" x 4-7/16" x 4-11/16")
(GR-SXM747UM/SXM347UM/
SXM247UM only)
206 mm x 112 mm x 115 mm
(8-1/8" x 4-7/16" x 4-9/16")
(GR-SX877UM/AX777UM
only)
(with the LCD monitor* closed
and with the viewfinder full
tilted downward)
* Models equipped with LCD monitor only.
Pickup
: 1/4" format CCD
Lens
: F1.6, f = 3.9 mm to 62.4 mm,
16:1 power zoom lens with
auto iris and macro control,
filter diameter 40.5 mm
Viewfinder
: Electronic viewfinder with
0.55" color LCD
(GR-SX877UM only)
Electronic viewfinder with 0.5"
black/white CRT
(GR-SXM747UM/SXM347UM/
SXM247UM/AX777UM only)
White balance
adjustment
: Auto/Manual adjustment
LCD monitor
: 3" diagonally measured, LCD
panel/TFT active matrix system
(GR-SXM747UM only)
2.5" diagonally measured, LCD
panel/TFT active matrix system
(GR-SXM347UM/SXM247UM
only)
Speaker
: Monaural
(models equipped with
LCD monitor only)
(models equipped with
LCD monitor only)
(The specifications shown pertain specifically to the model GR-AX777UM,GR-SX877UM)


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! 101
LOWER CASE ASSY
LY20684-001B
LY20684-003B
104
FRONT COVER ASSY
LY20683-002B
LY20683-006B
LY20683-018A
104E
DC LIGHT
­­
LY32040-001A
COVER(LIGHT)
LY30934-015A
LY30934-017A
­­
104F
SPACER(A)
­­
LY30029-0B4A
! 104H
CAUTION LABEL
­­
YQ44341-6
104J
STICKER(A)
LY32058-001A
LY32058-002A
105
CASS.COVER(S) ASSY
LY20680-002A
LY20680-009A
105D
WINDOW(S)
LY32023-002A
LY32023-003A
105E
STICKER(B)
LY32059-001A
LY32059-002A
106
UPPER CASE(S)
LY10272-007A
LY10272-011A
LY10272-012A
109
TOP OPE UNIT
LY20614-004B
LY20614-001B
130
FRAME ASSY
LY20678-002A
LY20678-001A
130E
CONTACT(LIGHT)
­­
YQ43810-1-1
130F
E-SI C WIRE C-F
­­
WJM0167-001A
TABLE OF CONTENTS
DIFFERENT TABLE ..................................................................................................................................................... 1 to 4
4. CHARTS AND DIAGRAM
4.1 LCD CTL SCHEMATIC DIAGRAM ........................................................................................................................ 4-1
4.2 C-VF BL SENSOR SCHEMATIC DIAGRAM .......................................................................................................... 4-3
4.3 MAIN CIRCUIT BOARD ........................................................................................................................................ 4-5
4.4 C-VF CIRCUIT BOARD ....................................................................................................................................... 4-11
5. PARTS LIST
5.1 PACKING AND ACCESSORY ASSEMBLY <M1> ................................................................................................. 5-1
5.2 ELECTRONIC VIEWFINDER ASSEMBLY <M4> ................................................................................................... 5-3
The following table indicate different parts number between models GR-AX760U,GR-AX777UM and GR-SX877UM.
FINAL ASSEMBLY <M2>
MODEL
GR-AX760U
GR-AX777UM
ITEM
GR-SX877UM
PACKING AND ACCESSORY ASSEMBLY <M1>
REF
NO.
!
MODEL
GR-AX760U
GR-AX777UM
ITEM
1
PACKING CASE
LY32179-001A
LY32054-0A4A
LY32054-0A6A
! 5
IB(EN)
LYT0689-001B
LYT0731-001A
!
IB(SP)
LYT0731-002A
7
REGIST.CARD
BT-51020-2
­­
16
REMOTE CONTROLLER
­­
LY42129-001A
18
BATTERY,X2,AAA(R03)
­­
USED
GR-SX877UM
The following table indicate main different points between models GR-AX760U,GR-AX777UM and GR-SX877UM.
MODEL
GR-AX760U
GR-AX777UM
ITEM
VIEW FINDER
B/W
COLOR
VIDEO LIGHT
NOT USED
USED
IR RECEVER
NOT USED
USED
BODY COLOR
MOLD BLACK
SILVER
TOTAL ZOOM RATIO
400 X
600 X
LIGHT SW
NOT USED
USED
DIGITAL ZOOM
50 X/400 X/OFF
50 X/600 X/OFF
S-VHS ON/OFF
NOT USED
USED
S OUT PUT
NOT USED
USED
REMOTE CONTROL UNIT(RM-V715U)
NOT USED
USED
GR-SX877UM
Note: Mark
is same as left.
REF
NO.
!
Note: Mark ­­ is not used. Mark
is same as left.
1


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400
MECHA(B) ASSY
YMA0030-E
YMA0031A-E
406
C.GUIDE(R) ASSY
­­
YQ44339A-7
406A
SW.LEVER(R)
­­
YQ32162-1-3
406B
TORSION SPRING
­­
YQ44340-1-4
407
TAP SCREW
­­
LY42819-001A
466
ROTARY ENCODER
QSW0888-001
QSW0888-002
MECHANISM ASSEMBLY <M3>
MODEL
GR-AX760U
GR-AX777UM
ITEM
GR-SX877UM
REF
NO.
!
! 300
ELECTRONIC VIEWFINDER ASSY(COLOR)
­­
LYH20242-001A
! 350
ELECTRONIC VIEWFINDER ASSY(B/W)
LY20701-001A
­­
ELECTRONIC VIEWFINDER ASSEMBLY <M4>
MODEL
GR-AX760U
GR-AX777UM
ITEM
GR-SX877UM
REF
NO.
!
PW1
MAIN BOARD ASSY
YB10310UA-03
YB10310UN-03
YB10310UO-04
IC1801
IR DETECT UNIT
­­
PIC-26043S
IC7001
IC
­­
CDX3518R
IC7005
IC
­­
BA4558F-X
IC7008
IC
­­
SN74LV4052APW-X
Q3006
DIGI TRANSISTOR
­­
DTC144EE-X
Q3505
DIGI TRANSISTOR
­­
DTC144EE-X
Q4705
TRANSISTOR
­­
2SC4617/QR/-X
Q4706
TRANSISTOR
­­
2SC4617/QR/-X
Q4707
TRANSISTOR
­­
2SC4617/QR/-X
Q4711
PAIR TRANSISTOR
­­
PUMX1-W
Q4712
PAIR TRANSISTOR
­­
PUMT1-W
Q4713
PAIR TRANSISTOR
­­
PUMX1-W
Q4714
PAIR TRANSISTOR
­­
PUMT1-W
Q4715
PAIR TRANSISTOR
­­
HN1C01FU/G/-X
Q6306
MOS FET
­­
SSM3K02F-X
Q7001
PAIR TRANSISTOR
­­
PUMX1-W
Q7003
PAIR TRANSISTOR
­­
PUMX1-W
Q7005
PAIR TRANSISTOR
­­
PUMX1-W
Q7023
TRANSISTOR
2SA1774/QR/-X
­­
D3001
SI DIODE
­­
DAN222-X
D7001
VARI CAP DIODE
­­
MA365-X
R3027
MG RESISTOR
­­
NRSA63J-103X
R4701
MG RESISTOR
NRSA63J-0R0X
­­
R4702
MG RESISTOR
NRSA63J-680X
NRSA63J-820X
R4711
MG RESISTOR
­­
NRSA63J-121X
R4712
CMF RESISTOR
­­
NRVA63D-561X
R4713
MG RESISTOR
­­
NRSA63J-681X
R4714
MG RESISTOR
­­
NRSA63J-122X
R4715
MG RESISTOR
­­
NRSA63J-0R0X
R4716
CMF RESISTOR
­­
NRVA63D-561X
R4717
CMF RESISTOR
­­
NRVA63D-222X
R4718
MG RESISTOR
­­
NRSA63J-104X
R4719
MG RESISTOR
­­
NRSA63J-222X
R4720
MG RESISTOR
NRSA63J-0R0X
­­
R4721
CMF RESISTOR
­­
NRVA63D-680X
R4723
CMF RESISTOR
­­
NRVA63D-680X
MAIN BOARD ASSEMBLY <01>
MODEL
GR-AX760U
GR-AX777UM
ITEM
GR-SX877UM
REF
NO.
!
Note: Mark ­­ is not used. Mark
is same as left.
2


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R4735
MG RESISTOR
­­
NRSA63J-332X
R4736
MG RESISTOR
­­
NRSA63J-332X
R4737
MG RESISTOR
­­
NRSA63J-104X
R4738
MG RESISTOR
­­
NRSA63J-332X
R4739
MG RESISTOR
­­
NRSA63J-332X
R4741
CMF RESISTOR
­­
NRVA63D-152X
R4743
CMF RESISTOR
­­
NRVA63D-223X
R4744
CMF RESISTOR
­­
NRVA63D-222X
R4745
CMF RESISTOR
­­
NRVA63D-681X
R4746
CMF RESISTOR
­­
NRVA63D-222X
R4747
CMF RESISTOR
­­
NRVA63D-681X
R6306
MG RESISTOR
­­
NRS12BK-R47W
R6307
MG RESISTOR
­­
NRSA63J-104X
R7002
MG RESISTOR
­­
NRSA63J-102X
R7003
MG RESISTOR
­­
NRSA63J-103X
R7004
MG RESISTOR
­­
NRSA63J-333X
R7005
MG RESISTOR
­­
NRSA63J-103X
R7007
CMF RESISTOR
­­
NRVA63D-473X
R7008
CMF RESISTOR
­­
NRVA63D-913X
R7061
CMF RESISTOR
­­
NRVA63D-183X
R7062
CMF RESISTOR
­­
NRVA63D-334X
R7077
CMF RESISTOR
­­
NRVA63D-682X
R7078
CMF RESISTOR
­­
NRVA63D-822X
R7079
MG RESISTOR
­­
NRSA63J-0R0X
R7083
MG RESISTOR
­­
NRSA63J-105X
R7085
CMF RESISTOR
­­
NRVA63D-822X
R7086
CMF RESISTOR
­­
NRVA63D-123X
R7088
CMF RESISTOR
­­
NRVA63D-223X
R7090
CMF RESISTOR
­­
NRVA63D-822X
R7091
CMF RESISTOR
­­
NRVA63D-123X
R7093
CMF RESISTOR
­­
NRVA63D-223X
R7095
CMF RESISTOR
­­
NRVA63D-822X
R7096
CMF RESISTOR
­­
NRVA63D-123X
R7098
CMF RESISTOR
­­
NRVA63D-223X
R7099
CMF RESISTOR
­­
NRVA63D-103X
R7100
CMF RESISTOR
­­
NRVA63D-103X
R7101
CMF RESISTOR
­­
NRVA63D-103X
R7102
CMF RESISTOR
­­
NRVA63D-103X
R7103
CMF RESISTOR
­­
NRVA63D-103X
R7124
CMF RESISTOR
­­
NRVA63D-103X
R7137
CMF RESISTOR
NRVA63D-911X
­­­­
R7138
CMF RESISTOR
NRVA63D-271X
­­­­
R7212
MG RESISTOR
­­
NRSA63J-0R0X
C3033
C CAPACITOR
­­
NCB31CK-104X
C4708
C CAPACITOR
­­
NDC31HJ-820X
C4709
C CAPACITOR
­­
NDC31HJ-150X
C4710
C CAPACITOR
­­
NCB31EK-103X
C4711
C CAPACITOR
­­
NCB21CK-105X
C4715
C CAPACITOR
­­
NCB21CK-105X
C4719
C CAPACITOR
­­
NCB31EK-103X
C6307
E CAPACITOR
­­
NEA71CM-106X
C7003
TA E CAPACITOR
­­
NBE20JM-335X
C7004
C CAPACITOR
­­
NCB31HK-332X
C7005
C CAPACITOR
­­
NCB31EK-103X
C7006
C CAPACITOR
­­
NDC31HJ-390X
C7007
C CAPACITOR
­­
NCB31HK-102X
C7008
C CAPACITOR
­­
NCB31EK-103X
MODEL
GR-AX760U
GR-AX777UM
ITEM
GR-SX877UM
REF
NO.
!
Note: Mark ­­ is not used. Mark
is same as left.
3


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C7012
C CAPACITOR
­­
NCB31CK-104X
C7021
TA E CAPACITOR
­­
NBP41EM-475X
C7022
C CAPACITOR
­­
NCB31EK-103X
C7024
TA E CAPACITOR
­­
NBP41EM-475X
C7041
TA E CAPACITOR
­­
NBE21AM-106X
C7045
C CAPACITOR
NDC31J-100X
­­
C7046
C CAPACITOR
NDC31J-100X
­­
C7047
C CAPACITOR
NDC31J-100X
­­
C7048
TA E CAPACITOR
NBE20JM-106X
­­
C7053
C CAPACITOR
­­
NCB31CE-103X
C7054
TA E CAPACITOR
­­
NBP41EM-475X
C7056
C CAPACITOR
­­
NCB21CK-104X
C7058
C CAPACITOR
­­
NCB31CK-104X
C7061
C CAPACITOR
­­
NCB11CK-475X
C7062
C CAPACITOR
­­
NCB11CK-475X
C7063
C CAPACITOR
­­
NCB11CK-475X
C7067
C CAPACITOR
­­
NCB31CK-104X
C7069
C CAPACITOR
­­
NCB31EK-103X
L6306
INDUCTOR
­­
NQL52EM-470X
L7002
INDUCTOR
­­
NQL085J-8R2X
L7005
P COIL
­­
NQL38DK-220X
L7007
P COIL
­­
NQL38DK-220X
L7008
P COIL
­­
NQL38DK-220X
L7012
P COIL
NQL144K-100X
­­
CN11
FPC CONNECTOR
­­
QGF0507F1-20X
CN12
W TO B CONNECTOR
QGA1201F2-05X
­­
J505
S JACK
­­
QND0068-001
MODEL
GR-AX760U
GR-AX777UM
ITEM
GR-SX877UM
REF
NO.
!
Note: Mark ­­ is not used. Mark
is same as left.
PW1
C-VF BL BOARD ASSY
­­
YB20901A
MODEL
GR-AX760U
GR-AX777UM
ITEM
GR-SX877UM
REF
NO.
!
ELECTRONIC VIEWFINDER ASSEMBLY<M4>
4