Aiwa HS-J400 Service Manual

AIWA’
S/M Code No. 84-013
DATE OF ISSUE 6/1984
SERVICE MANUAL
MODEL NO.
HS-J7,JO07,J400
FM/AM STEREO RADIO CASSETTE
RECORDER
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82681 -1081(DGR)
82681 -1091(DP)
Follow the instructions carefully, which will
allow the user to optimise the products’
performance and give many years of serivce.
. No illegibility shall be given to the specification plate, the cau-
tion labels, the fuse labels and others.
. When, on pattern sides of circuit boards, additional repair-parts
have been made up, the parts shall be firmly glued to circuit
boards or other components, unless the parts can be attached
firmly.
. The following matters shall be maintained as they are, when
repairing.
1) Soldering of lead-wire ends
2) Wiring and holding of lead-wires with wire-clips and binders
3) Materials of lead-wires
4) Location of all kinds of insulators
. General instructions for mechanism repair
1) The heads, capstan and pinch roller shall be cleaned of good
quality alcohol after repaired, because dirty heads shall cause
distorted sounds while‘dirty capstan and pinch roller shall
occur wow/flutter and take-up fault.
2) Lubricants been stained the surfaces of transmitting portion
of the belts, idlers, capstan and pinch roller shal! be removed,
because slippery and faulty tape travel shall be caused.
3) When oiling, only one or two drops shall be applied so as
not to run over and be dispersed. Note should be taken of the
metal fitting for the capstan and rotating portions of the
idlers and pinch roller, especially.
4) E-rings and poly slider washers shall be replaced with new
ones, if once those have been removed. — No re-utilization
due to unreliability.
5) Regular spare-parts shall always be used for repair, because
using irregular parts and tampering with the products shall
cause deterioration, mulfunction and damage.

Aiwa HS-J400 Specifications

General

Brand	Aiwa
Model	HS-J400
Category	Cassette Player
Language	English

Summary

General Repair and Maintenance Guidelines

Label Integrity and Protection

Circuit Board Repair Procedures

Securely glue added parts to circuit boards or components.

Pre-Repair Condition Checks

Mechanism Repair Precautions

Clean heads, capstans, pinch rollers. Avoid lubricants on moving parts.

Radio Section Specifications

Radio Circuitry and Reception Specs

Details on superheterodyne circuitry, FM/AM frequencies, and sensitivity.

Intermediate Frequency and Image Rejection

IF Rejection and Separation

Tape Recorder Section Specifications

Tape Recorder Output and Noise Specs

Wow/Flutter, Auto-Stop, and Torque

Tape speed fluctuations, auto-stop function, and torque specifications.

Input/Output and Frequency Response

Detailed Radio Section Specifications

Radio Sensitivity and Rejection Specs

Radio Separation and Frequency Range

Detailed Tape Recorder Specs

Tape Recorder SNR and Distortion

Tape Recorder Frequency Response

Tape Recorder Motor and Auto-Stop

Adjustment Procedures - Radio Tuning

AM/FM IF and Tracking Adjustments

Procedures for adjusting IF and tracking for AM/FM bands.

AM/FM Frequency Range Adjustments

How to adjust the frequency range for AM and FM.

Leaf Switch Adjustment

Adjusting the leaf switch for proper gap.

Dolby Level and VCO Adjustments

Adjusting Dolby level and VCO frequency.

Main Circuit Board - Pattern Side Schematic

Main CB Pattern Layout

Visual layout of components and traces on the main PCB.

Circuit Board Wiring Diagrams

Main Circuit Board Wiring

Wiring details for the main circuit board.

Switch Circuit Board Wiring

LED and Other Circuit Board Wiring

Circuit Board Wiring Details

Main CB Wiring Details

Detailed wiring connections on the main circuit board.

Switch and LED CB Wiring

Motor Auto Stop Wiring

Tape Speed Adjustment

Tape Speed Adjustment Procedure

Procedure to adjust tape speed.

PC Board Pattern Diagram

Main PC Board Pattern

Printed circuit board component and trace layout.

Mechanism Functions - Bottom Plate Assembly

Removing Bottom Plate Assembly

Steps to remove the bottom plate assembly.

Installing Bottom Plate Assembly

Steps for correctly installing the bottom plate assembly.

Bottom Plate Assembly Component Alignment

C-Spring and Arm Installation Guide

Mechanism Functions - Transmission Processes

FWD PLAY Lever Movement Process

Lever movement path during forward play.

FWD PLAY Gear Transmission Process

Gear transmission path during forward play.

REVERSE PLAY Gear Transmission Process

Gear transmission path during reverse play.

Mechanism Functions - Reverse Operations

Manual Reverse Transmission Path

Lever and gear path for manual reverse.

Auto Reverse Transmission Path

Lever and gear path for auto reverse.

Reverse Mode Selection

Correct positioning for continuous/return auto-reverse.

Mechanism Functions - Auto Stop and FF

Auto Stop Operation at Tape End (Record)

Mechanism action when tape ends during recording.

FF Operation - Gear Transmission

Gear movement path during fast forward.

FF Operation - Lever Movement

Lever movement path during fast forward.

Mechanism Functions - REW and Spring Application

REW Operation - Gear Transmission

Gear movement path during rewind.

REW Operation - Lever Movement

Lever movement path during rewind.

Spring Application Diagram

Disassembly Instructions - Cabinet and Lid

Removing Rear Cabinet

Steps to remove the rear cabinet.

Removing Cassette Lid

Steps to remove the cassette lid.

Disassembly Instructions - Main Board and Panel

Removing Main PCB

Removing Operation Panel