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Aiwa HV-GX900 K User Manual

Aiwa HV-GX900 K
90 pages
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BASIC TAPE MECHANISM : OVD-6
VIDEO CASSETTE RECORDER
HV-GX950
HV-GX900
S/M Code No. 09-975-331-5N1
K
K
SERVICE MANUAL
DATA
230 V AC, 50 Hz
14W
3.5 kg (7.7 lbs.)
380 mm (W) x 267 mm (D) x
95 mm (H)
(15 x 10 5/8 x 3 3/4 in.)
5°C to 40°C
Rotary 2 head helical scanning
system
PAL colour system, 625 lines,
50 fields
Azimuth 2 heads
VHS video cassette
UHF: 21 to 69
UHF channels between 23 and
69, 73 dBµ
240 lines
30 minutes
Frequency synthesized tuner
I
SPECIFICATIONS
PAL SP: 23.39 mm/sec
LP: 11.69 mm/sec
NTSC (playback only)
SP: 33.35 mm/sec
PAL SP: 5 hours with E-300 tape
LP: 10 hours with E-300 tape
NTSC (playback only)
SP: 3 hours 30 minutes with
T-210 tape
1.0 Vp-p, 75 ohm, unbalanced
1.0 Vp-p, 75 ohm, unbalanced
53 dB (nominal)
–3.8dBs, 50K ohm
–3.8dBs, less than 1 Kohm
1 track (Mono)
135 seconds with E-180 tape
108 seconds with E-180 tape
TAPE SPEED ...................................
RECORDING/PLAYBACK TIME .....
VIDEO INPUT...................................
VIDEO OUTPUT ..............................
VIDEO S/N .......................................
AUDIO INPUT ..................................
AUDIO OUTPUT ..............................
AUDIO TRACK .................................
FAST-FORWARD TIME...................
REWIND TIME .................................
POWER REQUIREMENTS.................
POWER CONSUMPTION...................
WEIGHT ..............................................
DIMENSIONS ......................................
OPERATING TEMPERATURE ...........
VIDEO RECORDING SYSTEM ..........
VIDEO SIGNAL SYSTEM ...................
VIDEO HEAD ......................................
USABLE CASSETTES ........................
CHANNEL COVERAGE ......................
RF OUTPUT ........................................
HORIZONTAL RESOLUTION ............
TIMER BACKUP .................................
TUNER SYSTEM ................................
TV SYSTEM ........................................
Design and specifications are subject to change without
notice.

Table of Contents

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Aiwa HV-GX900 K Specifications

General IconGeneral
Tape FormatVHS
Number of Heads4
Hi-Fi AudioYes
Remote ControlYes
ShowViewYes
TunerYes
Playback SpeedSP/LP
InputsRF
OutputsRF

Summary

Video Cassette Recorder Specifications

Servicing Notices on Checking

Disassembly Instructions

Top Cabinet, Front Cabinet and Operation 1, 2 PCB Removal

Instructions for removing the main casing and operation boards.

Flap Removal

Procedure for removing the front flap assembly.

Deck Chassis Removal

Steps to detach the main VCR deck mechanism.

Syscon PCB Removal

Guide for removing the System Control PCB.

Top Bracket Removal

Instructions for removing the top bracket component.

Deck Cover, Flap Lever, and Tape Guide R Removal

Steps for removing the deck cover, flap lever, and tape guide.

Tape Guide L Removal

Procedure for removing the left tape guide.

Cassette Holder Assy Removal

Steps to remove the cassette loading mechanism.

Cassette Side L/R Removal

Instructions for removing the cassette side components.

Link Assy Removal

Procedure for removing the internal link assembly.

Loading Motor Assy Removal

Steps to detach the loading motor assembly.

Sensor Cover L Removal

Instructions for removing the left sensor cover.

Tension Assy Removal

Procedure for removing the tape tension mechanism.

T Brake Assy Removal

Steps to detach the T brake assembly.

S Reel/T Reel Assy Removal

Instructions for removing the supply and take-up reel assemblies.

Pinch Roller Assy/P5 Arm Assy Removal

Procedure for removing pinch roller and related parts.

A/C Head Removal

Steps to detach the Audio/Control head.

FE Head (Recorder Only) Removal

Instructions for removing the Full Erase head.

AHC Assy/Cylinder Unit Assy Removal

Procedure for removing the cylinder unit and associated assemblies.

Capstan DD Unit Removal

Steps to detach the Capstan Direct Drive unit.

Middle Gear/Main Cam Removal

Instructions for removing the middle gear and main cam.

Clutch Assy Removal

Procedure for removing the clutch assembly.

Loading Gear S/T Assy Removal

Steps to detach the loading gear assemblies.

Inclined S/T Assy Removal

Instructions for removing the inclined S and T assemblies.

Key to Abbreviations

Service Mode List

Preventive Checks and Service Intervals

Confirmation of Using Hours

Procedure to check the total operating hours of the VCR.

Cleaning Procedures

Guidelines for cleaning key components like heads and tape path.

Note for Memory IC Replacement

Servicing Fixtures and Tools

Preparation for Servicing

VCR Test Tape Interchangeability Table

Mechanical Adjustments

Confirmation and Adjustment Overview

General notes and initial checks before mechanical adjustments.

Reel Disk Height Confirmation and Adjustment

Steps to adjust reel disk height for proper tape path.

Tension Post Position Confirmation and Adjustment

Procedure to set the correct position of the tape tension post.

Playback Torque and Back Tension Confirmation

Method to verify playback torque and back tension.

VSR Torque Confirmation

Procedure to check the VSR torque.

Reel Brake Torque Confirmation

Steps to check S Reel and T Reel brake torque.

Tape Running Mechanism Confirmation and Adjustment

Procedures for confirming and adjusting tape transport.

Guide Roller Adjustment

Instructions for adjusting the guide roller for tape path accuracy.

Audio/Control Head Confirmation and Adjustment

Steps to confirm and adjust the audio/control head position.

Tape Running Adjustment (X Value)

Procedure for adjusting the X value for tape running.

Mechanism Adjustment Parts Location Guide

Diagram showing the location of parts for mechanism adjustments.

Electrical Adjustments

Basic Adjustment Overview

General notes and initial steps for electrical adjustments.

PG Shifter Adjustment

Procedure to adjust the Pulse Generator (PG) shifter.

Electrical Adjustment Parts Location Guide

Diagram showing the location of parts for electrical adjustments.

Troubleshooting Guide

Power Does Not Turn On

Troubleshooting steps for when the unit fails to power on.

Power Shuts Off

Diagnostic guide for issues where the VCR unexpectedly powers off.

Cylinder Not Rotating

Troubleshooting steps for a non-rotating cylinder motor.

Audio Shakes

Diagnostic guide for problems causing audio instability or shakiness.

Cassette Tape Not Accepted

Troubleshooting steps for when the VCR does not accept a cassette.

IC Descriptions

Semiconductor Base Connections

Mechanical Exploded View

Mechanical Replacement Parts List

Electrical Replacement Parts List

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