Brand: HITACHI
Category: Audio
Document Type: Manual
Language: EN
Available Languages: EN , ES
Manual for DA-40/DA-50
Uploaded: Nov. 21, 2025, 7:55 p.m.
Manual Publish Date: 1988-07-01
Warranty Information
This manual does not contain specific warranty period information.
Operation Summary
This is a service manual for the Hitachi DA-40/DA-50 Compact Disc Player. It contains detailed information on specifications, maintenance, troubleshooting, parts replacement, and circuit diagrams. Key operational aspects covered include: * **Specifications:** Audio performance, disc format, signal format, pickup system, and general power requirements. * **Maintenance:** Cleaning, safety precautions, and checking for proper insulation. * **Troubleshooting:** A detailed flowchart guides technicians through diagnosing common issues, including laser output, signal presence, and motor drive. * **Parts Replacement:** Lists of replacement parts with part numbers and descriptions, including detailed exploded views of the mechanism. * **Adjustments:** Procedures for adjusting tracking servo offset and PLL. * **Circuit Diagrams:** Detailed schematics for various sections of the player, including printed wiring boards and block diagrams.Troubleshooting and error codes
| Issue | Possible Cause | Action |
|---|---|---|
| Laser lights | Laser is able to function even if safety switches are out of function. Laser light is invisible. | DO NOT DISASSEMBLE THE LASER UNIT, PLEASE REPLACE THE COMPLETE UNIT. |
| No signal output at IC001 focus search terminal | IC001 or C105 defective. | Replace IC001 or C105. |
| No EFM signal output at TP1 even in small level | Flexible P.W.B. pattern broken or IC001 defective. | Repair or replace flexible P.W.B. or IC001. |
| EFM signal output is increased by turning R006 but still no EFM signal | Actuator wire or flexible P.W.B. pattern broken. | Repair or replace actuator wire or flexible P.W.B. |
| Laser output not adjusted properly | Turntable height error, laser output adjustment error, or laser diode degraded. | Check turntable height, laser output adjustment, and laser diode. |
| No FOK signal output | IC001 defective. | Replace IC001. |
| No FER signal output | IC001 defective, pickup diode defective, flexible P.W.B defective. | Replace IC001, pickup diode, or flexible P.W.B. |
| No FZC signal output | IC001 defective. | Replace IC001. |
| No MON signal output | Faulty connection between IC401 pins, and IC901. | Check connections. |
| No MDP signal output | Faulty connection between IC401 pins, and IC901. | Check connections. |
| No drive voltage applied to disc motor | IC201 defective, Q201 or Q202 defective, or surrounding circuitry defective. | Replace IC201 or Q201/Q202, or repair surrounding circuitry. |
| Output pin defective | Output pin defective. | Replace output pin. |
| No signal output at output pin | The vicinity of Q502LR defective. | Check vicinity of Q502LR. |
| No DCL, DCR signal | IC401 defective. | Replace IC401. |
| No SHL/SHR signal | IC401 defective. | Replace IC401. |
| No low-pass filter output | IC502LR or IC503LR defective. | Replace IC502LR or IC503LR. |
| No audio preamplifier output | IC504 and peripheral circuits defective. | Replace IC504 or peripheral circuits. |
| No signal output at output pin (Audio) | The vicinity of Q504LR defective. | Check vicinity of Q504LR. |