Aiwa Z-L720U User Manual

SERVICE MANUAL
DATA
COMPACT DISC STEREO
SYSTEM
BASIC TAPE MECHANISM : ZZM-3 PR1NM
BASIC CD MECHANISM : 6ZG-1 ZZRNIM
Z-L720
Z-L820
U
LH
S/M Code No. 09-012-440-1R1
REVISION
• This Service Manual is the "Revision Publishing" and replaces "Simple Manual"
Z-L720 (U) / L820 (LH), (S/M Code No. 09-011-440-1T1).
• If requiring information about the CD mechanism, see Service Manual of
6ZG-1, (S/M Code No. 09-001-338-7N8).
Z–L720
SPEAKERSYSTEM
CD
CASSEIVER
SX–WZL720CX–ZL720
REMOTE
CONTROLLER
RC–ZAS02
Z–L820 CX–ZL820 SX–WZL820 RC–ZAS02

Aiwa Z-L720U Specifications

General

Type	Mini Hi-Fi System
Frequency Response	20Hz - 20kHz
CD Player	Yes
Tuner	Yes
Remote Control	Yes
Tuner Bands	FM
Speaker Impedance	6 Ohms
Speakers	2-way speakers

Summary

Specifications

Amplifier Section Specifications

Details about power output, THD, inputs, and outputs.

Cassette Deck Section Specifications

Compact Disc Player Specifications

Laser Safety Precautions

General Laser Safety Warning

Emphasizes caution when working near the laser beam.

Optical Block Replacement Precautions

Advises on preventing static discharge when replacing the optical block.

Pre-Repair Procedures

Forced Discharge of Power Supply Capacitors

Steps to safely discharge electrolytic capacitors before servicing.

Microcomputer HOLD Terminal Check

Verifying the HOLD terminal voltage of the microcomputer.

Microcomputer Troubleshooting

Reset Procedure

How to perform a forced reset on the microcomputer.

Soldering Confirmation

Tuner Section Adjustments

Clock Frequency Check

AM VT and FM VT Adjustments

Adjusts Voltage Tuning (VT) for AM and FM bands.

AM/FM Tracking and IF Adjustments

Adjusts tracking and Intermediate Frequency (IF) for AM and FM.

DC Balance and Mono Distortion Adjustment

Procedure to adjust DC balance and mono distortion for audio output.

Output Level and FM Separation Checks

Deck Section Adjustments

Tape Speed and Head Azimuth Adjustment

Procedures for adjusting tape speed and head azimuth for both decks.

Playback and Recording Response Adjustments

Front Section Adjustments

Microcomputer OSC Adjustment

Procedure to adjust the microcomputer's OSC frequency.

CD Test Mode Operations

Activating CD Test Mode

CD Test Mode Functions and Usage

Speaker Unit Disassembly and Reassembly