JVC HR-S2901U User Manual

SERVICE MANUAL
No.82912
March 2002
HR-S2901U, HR-S2911U(C),
HR-S3901U,
HR-S3911U, HR-S3911U(C)
Regarding service information other than these sections, refer to the HR-S5901U service manual (No.82911).
Also, be sure to note important safety precautions provided in the service manual.
VIDEO CASSETTE RECORDER
This service manual is printed on 100% recycled paper.
COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD
SPECIFICATIONS (The specifications shown pertain specifically to the model HR-S3901U.)
V15S0/S1
REW
FF
REC LINK
24HR QUICK
PROGRAM
POWER
DISPLAY
SP/EP
Specifications shown are for SP mode unless specified otherwise.
E. & O.E. Design and specifications subject to change without
notice.
GENERAL
Power requirement : AC 120 V d , 60 Hz
Power consumption
Power on : 17 W
Power off : 1.5 W
Temperature
Operating : 5°C to 40°C (41°F to 104°F)
Storage : –20°C to 60°C (–4°F to140°F)
Operating position : Horizontal only
Dimensions (W x H x D) : 435 mm x 94 mm x 247 mm
(17-3/16" x 3-3/4" x 9-3/4")
Weight : 2.8 kg (6.2 lbs)
Format : S-VHS/VHS NTSC standard
Maximum recording time
SP : 210 min. with ST-210 video cassette
EP : 630 min. with ST-210 video cassette
VIDEO/AUDIO
Signal system : NTSC-type color signal and EIA
monochrome signal, 525 lines/
60 fields
Recording/Playback
system
: DA-4 (Double Azimuth) head helical
scan system
Signal-to-noise ratio : 45 dB
Horizontal resolution
VHS : 230 lines
S-VHS : 400 lines
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)
S-video connectors (IN x 1, OUT x 1)
TUNER
Tuning system : Frequency-synthesized tuner
Channel coverage
VHF : Channels 2–13
UHF : Channels 14–69
CATV : 113 Channels
RF output : Channel 3 or 4 (switchable; preset to
Channel 3 when shipped) 75 ohms,
unbalanced
TIMER
Clock reference : Quartz
Program capacity : 1-year programable timer/8 programs
Memory backup for timer is not supported.
ACCESSORIES
Provided accessories : Infrared remote control unit,
“AA” battery x 2,
S-video cable (4-pin),
RF cable (F-type)

JVC HR-S2901U Specifications

General

Type	VCR
Video Format	NTSC
Recording Speed	SP, LP, EP
Tuner	Yes
Number of heads	4
Remote control	Yes
Playback Speeds	SP, LP, EP
Connections	RF, Composite Video
Inputs	Composite video, RF
Outputs	Composite video, RF

Summary

SPECIFICATIONS

General Specifications

Details general operational and physical characteristics, power requirements, dimensions, and format.

Tuner Specifications

Information on the tuning system, channel coverage, and RF output.

Timer Specifications

Details on clock reference and program capacity for the timer function.

Provided Accessories

Lists accessories provided with the VCR unit.

IMPORTANT SAFETY PRECAUTIONS

Servicing Safety Precautions

Crucial guidelines for safe service procedures, component replacement, and handling electrical hazards.

INSTRUCTIONS

Disassembly Procedures

Step-by-step guide for disassembling the VCR, including manual cassette removal.

MECHANISM

Mechanism Pre-Disassembly Checks

Notes and checks required before disassembling the mechanism assembly.

Mechanism Parts Replacement

Detailed procedures for removing and installing key mechanism components.

Mechanism Timing Chart

Diagram illustrating the timing sequence of mechanism operations during playback modes.

ADJUSTMENT

Pre-Adjustment Procedures

Essential precautions, required equipment, and initial setup for adjustments.

Mechanism Compatibility Adjustment

Procedures for adjusting mechanism components like tension pole and A/C head alignment.

Electrical Adjustment Procedures

Steps for adjusting servo, video, and audio circuits for optimal performance.

CHARTS AND DIAGRAMS

Schematic Diagram Notes

Important notes on component units, voltage indications, and connector symbols in schematics.

Board Interconnections Diagram

Diagram showing connections between major circuit boards and external connectors.

Main Video/Audio Schematic

Schematic diagram detailing the video and audio processing circuits.

Remote Controller Schematic Diagram

Schematic diagram for the remote controller unit.

Signal Waveforms

Illustrations of expected waveforms at various test points during operation.

CPU Pin Function Details

Description of pin functions for the System Control Microcomputer (IC3001).

System Control Block Diagram

Block diagram illustrating the system control logic and signal flow.

PARTS LIST

Packing and Accessory Parts List

List of parts included in the packing and accessory assembly.

Final Assembly Parts List

List of parts pertaining to the final assembly of the VCR unit.

Mechanism Assembly Parts List

List of parts constituting the mechanism assembly of the VCR.

Electrical Parts List

List of electrical components used across various circuit boards.