JVC HR-J791AM, HR-J797AM Service Manual
SERVICE MANUAL
VIDEO CASSETTE RECORDER
HR-J791AM,HR-J797AM
Regarding service information other than these sections, refer to the HR-J781AM, J787AMservice manual (No. 82871).
Also, be sure to note important safety precautions provided in the service manual.
SPECIFICATIONS
GENERAL
Power requirement
Rating : AC 110 V – 240 V ` , 50 Hz/60 Hz
Operating : AC 90 V – 260 V ` , 50 Hz/60 Hz
Power consumption : 16 W
Temperature
Operating : 5°C to 40°C
Storage : –20°C to 60°C
Operating position : Horizontal only
Dimensions (W x H x D) : 400 mm x 94 mm x 270 mm
Weight : 3.1 kg
Format : VHS standard
Maximum recording time
(SP) : 240 min. with E-240 video cassette
(PAL/MESECAM)
: 160 min. with T-160 video cassette
(NTSC)
(LP) : 480 min. with E-240 video cassette
(PAL/MESECAM)
(EP) : 480 min. with T-160 video cassette
(NTSC)
VIDEO/AUDIO
Signal system : PAL-type colour signal and CCIR
monochrome signal, 625 lines 50 fields
: NTSC colour and EIA monochrome
signals, 525 lines/60 fields
Recording system : DA-4 (Double Azimuth) head helical
scan system
Signal-to-noise ratio : 45 dB
Horizontal resolution : 250 lines (PAL/MESECAM)
: 220 lines (NTSC)
Frequency range
Normal audio : 70 Hz to 10,000 Hz
Hi-Fi audio : 20 Hz to 20,000 Hz
Input/Output : RCA connectors (IN x 2, OUT x 1)
TUNER/TIMER
TV channel storage capacity
Tuning system : Frequency synthesized tuner
Channel coverage
VHF : (Low) 42 MHz – 175 MHz
UHF : 470 MHz – 870 MHz
Aerial output : UHF channels (Adjustable E28 – E60)
Memory backup time : Approx. 6 months
ACCESSORIES
Provided accessories : RF cable,
Specifications shown are for SP mode unless specified otherwise.
E. & O.E. Design and specifications subject to change without notice.
: 99 positions (+AUX position)
(High) 175 MHz – 470 MHz
Estimated figure based on supplied
fresh battery; actual performance may
differ.
Lithium battery CR2025,
Infrared remote control unit,
“R6/UM-3” battery x 2,
This service manual is printed on 100% recycled paper.
COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.
No. 82932
June 2002
The following table indicate main different points between models HR-J781AM and HR-J791AM.
ITEM
WINDOW COLOR BLUE METALLIC BLUE
RCU COLOR SILVER LIGHT GRAY
MODEL
HR-J781AM HR-J791AM
The following table indicate main different points between models HR-J787AM and HR-J797AM.
ITEM
WINDOW COLOR BLUE METALLIC BLUE
RCU COLOR SILVER LIGHT GRAY
MODEL
HR-J787AM HR-J797AM
The following table indicate different parts number between models HR-J781AM and HR-J791AM.
PACKING AND ACCESSORY ASSEMBLY <M1>
REF. MODEL
!
NO ITEM
301 PACKING CASE LP31005-001A *LP31005-003A
306 REMOTE CONTROLLER LP20878-008B LP20878-018B
306A COVER(BATTERY) LP40610-002A LP40610-003A
! 310 INST.BOOK(EN) LPT0595-001A LPT0687-001A
! INST.BOOK(CH) LPT0595-002A LPT0687-002A
! INST.BOOK(RU) LPT0595-003A LPT0687-003A
HR-J781AM HR-J791AM
FINAL ASSEMBLY <M2>
REF. MODEL
!
NO ITEM
! 501 FRONT PANEL ASSY LP10333-045B LP10434-010A
501A CASSETTE DOOR LP20961-017B LP20961-028A
! 502 TOP COVER LP10013-045A *LP10013-045B
524 STOPPER LP40253-001B —
525 SPECIAL SCREW/SCREW PQ40413 *QYTDSF4012Z
HR-J781AM HR-J791AM
MAIN BOARD ASSEMBLY <03>
REF. MODEL
!
NO ITEM
IC3003 IC/IC(EEPROM) AT24C08N-10SC-X *LPN0636-001A-01
Q1 TRANSISTOR 2SC4081/S/-X *2SC4081/QRS/-X
Q2 TRANSISTOR 2SC4081/S/-X *2SC4081/QRS/-X
Q3 TRANSISTOR 2SC4081/S/-X *2SC4081/QRS/-X
Q4 TRANSISTOR 2SC4081/S/-X *2SC4081/QRS/-X
C3003 E CAPACITOR QEKJ1HM-106 *QEKJ1CM-106
C5202 E CAPACITOR QEMT1CM-687 *QETN1CM-108
HR-J781AM HR-J791AM
Notes : Mark — is not used.
Mark * reference model was also changed.
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