Aiwa AD-WX808 Service Manual

AIWA
S/M Code No. 87—057
10/1987 -|
DATE OF ISSUE
SERVICE
MANUAL
MODEL No. AD = WX808
Ш STEREO CASSETTE DECK
Ш ТҮРЕ. HB,UB,EB,KB,ZB
Ш BASIC MECHANISM : Х-3
——
Туре Stereo cassette tape deck
Track format 4 tracks, 2 channels
Power supply AD-WX808E, Z
AC 220 V, 50/60 Hz
AD-WX808K
AC 240 V, 50/60 Hz
AD-WX808U
AC 120 V, 60 Hz
AD-WX808H
АС 120 V/220 У/240 V
switchable, 50/60 Hz
Power
consumption AD-WX808E, K, Z
36 W
AD-WX808H, U
30 W
Frequency
response METAL tape: 20 — 18,000 Hz
СгО; tape: 20 — 17,000 Hz
NORMAL tape: 20 — 16,000 Hz
Signal-to-noise
ratio 92 dB (CrO, tape dbx NR
ON)
73 dB
(METAL tape DOLBY C NR ON)
SPECIFICATIONS
Wow and flutter Deck
0.1% (According to DIN 45500)
0.055% (WRMS)
Deck
01% (According to DIN 45500)
0.055% (WRMS)
4.8 cmisec. (1-7/8 ips), 9.5 cm/sec
(Double speed)
Recording system AC bias (frequency 100 kHz)
Tape speed
Erase system AC erase
Motor DC Servomotor x 2
Heads Record/playback head x 1
(AMORPHOUS HEAD)
Playback head x 1
(AMORPHOUS HEAD)
Erase head x 1
Inputs LINE IN maximum input
sensitivity: 50 mV (over 50 kQ)
Outputs LINE OUT standard output level:
400 mV (0 VU); suitable load
impedance: over 47 КО.
Dimensions 430(W) x 126.5(H) x 318.5(D)mm
Weight 5.5 kg
е Design and specifications are subject to change without
notice.
е Noise reduction system manufactured under license from
Dolby Laboratories Licensing Corporation.
е Dolby and the [X] symbo! are trademarks of Dolby Labo-
|
e
HX
professional
originated
by
BANG&OLUFSEN.
ratoris
Licensing
Corpayatians
АМА
СО,
Ltd.
Tokyo
Japan
Printed in Japan

Aiwa AD-WX808 Specifications

General

Brand	Aiwa
Model	AD-WX808
Track System	4-track, 2-channel stereo
Tape Speed	4.76 cm/s
Frequency Response (Metal tape)	20 Hz - 20 kHz
Power Supply	AC 120V, 60Hz
Type	Dual Cassette Deck
Heads	1 x Record/Playback, 1 x Erase
Motor	DC Motor
Inputs	Line In
Outputs	Line Out
Dimensions	430 x 125 x 297mm

Summary

Specifications

Power Supply

Details the power supply voltage and frequency.

Frequency Response

Specifies frequency response for different tape types.

Signal-to-Noise Ratio

Details signal-to-noise ratio with NR systems.

Wow and Flutter

Specifies wow and flutter for decks.

Schematic Diagram-1

Main C.B

Schematic for the main circuit board.

IC Block Diagram

Block diagram for IC LB1408.

Truth Table

Truth table for input control.

Schematic Diagram-2

Main C.B (2/2)

Continues the schematic for the main circuit board.

SW-1 C.B

Schematic for SW-1 circuit board.

SW-2 C.B

Schematic for SW-2 circuit board.

Schematic Diagram-3

Main C.B (1/2)

Schematic for the main circuit board.

R/P/E Head

Schematic for the Record/Playback/Erase head.

Mechanism-1 C.B

Schematic for Mechanism-1 circuit board.

Wiring-1

A Main C.B

Wiring diagram for the main circuit board.

SW-1 C.B

Wiring diagram for SW-1 circuit board.

SW-2 C.B

Wiring diagram for SW-2 circuit board.

Wiring-2

Mechanism-1 C.B

Wiring diagram for Mechanism-1 circuit board.

Mechanism-2 C.B

Wiring diagram for Mechanism-2 circuit board.

TR C.B

Wiring diagram for TR circuit board.

Block Diagram-1

Power Supply

Diagram of the power supply section.

Final Amp

Block diagram of the final amplifier.

IC Block Diagram

Block diagram for IC LB1408.

Block Diagram-2

IC 101, IC 102

Block diagram for IC 101 and IC 102.

IC 201, IC 202

Block diagram for IC 201 and IC 202.

IC 301, IC 302

Block diagram for IC 301 and IC 302.

Block Diagram-2 (Continued)

IC 101, IC 102

Block diagram for IC 101 and IC 102.

IC 201, IC 202

Block diagram for IC 201 and IC 202.

IC 301, IC 302

Block diagram for IC 301 and IC 302.

Wiring-2 (Continued)

Mechanism-1 C.B

Wiring diagram for Mechanism-1 circuit board.

Mechanism-2 C.B

Wiring diagram for Mechanism-2 circuit board.

TR C.B

Wiring diagram for TR circuit board.

Wiring-2 (Continued)

Power C.B

Wiring diagram for Power circuit board.

FL C.B

Wiring diagram for FL circuit board.

SW-1 C.B

Wiring diagram for SW-1 circuit board.

FL C.B (Continued)

Power C.B (Continued)

Wiring diagram for Power circuit board.

Block Diagram-1 (Continued)

IC Block Diagram

Block diagram for IC LB1408.

IC 6520H (IC801)

Block diagram for IC 6520H.

Abbreviations

List of abbreviations used in block diagrams.

Block Diagram-2 (Continued)

Adjustment

Procedures for adjusting the unit.

IC 101, IC 102

Block diagram for IC 101 and IC 102.

IC 201, IC 202

Block diagram for IC 201 and IC 202.

Adjustment (Continued)

1. Normal Speed Adjustment (DECK-1, DECK-2)

Adjusts normal speed using test tape.

2. High Speed Adjustment (DECK-1, DECK-2)

Adjusts high speed using test tape.

3. Head A

Head adjustment procedure.

Main C.B

3. Head Azimuth Adjustment (DECK-1, DECK-2)

Adjusts head azimuth for optimal output.

4. PU Frequency Response Adjustment (DECK-1, DECK-2)

Adjusts frequency response using test tape.

5. PB Sensitivity Adjustment (DECK-1, DECK-2)

Adjusts playback sensitivity.

Deck 2 R/P/E Head

7. Bias OSC Trap Coil Adjustment (DECK-2)

Adjusts bias OSC trap coil.

8. REC Equalizer Level Adjustment

Adjusts record equalizer level.

13. Peak Meter Adjustment

Adjusts the peak meter display.

IC Description

LC6520H (IC801)

Pin description for IC LC6520H.

Practical Service Figure

Playback Output

Specifies playback output levels.

PB/REC Output

Specifies PB/REC output levels.

PB/REC Distortion

Specifies PB/REC distortion limits.

Playback Noise

Specifies playback noise levels.

Circuit Description

1. Overview

Explains the dbx Noise Reduction System overview.

Circuit Description (Continued)

2. Operations in Each Mode

Describes operations in different modes (dbx ON/OFF).

1) dbx-OFF (Bypass Mode)

Operation of the circuit when dbx is OFF.

Circuit Description (Continued)

2) dbx Playback (Decode Mode)

Operation during dbx playback (decode mode).

6292/94NK Decode Mode (During dbx playback)

Signal levels during decode mode.

Circuit Description (Continued)

3) dbx Record (Encode Mode)

Operation during dbx record (encode mode).

3. Functions of Each Section

Explains functions of circuit sections.

1) RMS Level Sensor

Function of the RMS Level Sensor.

Circuit Description (Continued)

3) RMS BPF and RMS Pre-Emphasis

Function of RMS BPF and PRE-EMPHASIS.

5) Logic Control

Explains logic control operations.

Exploded View-1

PCB-A

Exploded view of PCB-A.

PCB-B

Exploded view of PCB-B.

PCB-C

Exploded view of PCB-C.

PCB-D

Exploded view of PCB-D.

Mechanical Parts List

Deck 1 (X-3 P3)

Alteration parts list for Deck 1.

Deck 2 (X-3 R3)

Alteration parts list for Deck 2.

Accessories/Package List

List of accessories and package items.

DECK1 (X-3 P3) Alteration Parts List

Actuating Chassis PH Assy

Part details for Actuating Chassis PH Assy.

Head Housing PH Assy

Part details for Head Housing PH Assy.

Belt

Part details for the belt.

DECK2 (X-3 R3) Alteration Parts List

Actuating Chassis PH Assy

Part details for Actuating Chassis PH Assy.

Head Housing PH Assy

Part details for Head Housing PH Assy.

Belt

Part details for the belt.