LG OJ98 User Manual

[Others][Apply the modified main board to improve Disk Open / Close malfunction.
(Measure and replace the main board)]
Service Bulletin
Applicable for Serial Number : ALL Serial
1. Repair Instruction
For repairing this issue, we need to change Main Board after checking resistor value.
1) Measurement and replacement of main board is applied to the use of long-term inventory and to all boards to be
received
from the field in the future
2) If issue is happened, Change from issue Main Board to improved Main Board after checking the resister value because it
has
no Part Number changing.
(Improved Main Board information : The Board that is produced after ‘19.3.27 / ‘19.3.29 / ‘19.4.8)
The Board after ‘19.3.27 : CJ98, CJ88, CJ87
The Board after ’19.3.29 : CJ45, CJ44, CJ65, CK57, CK56, CK43, CK99
The Board after ‘19.4.8 : OJ98, OK99, OM4560, OK45, OK55, OK75
※ Please refer
to next page for each model’s service method
Page 1
Applicable for models MINI / Onebody
- MINI *(CJ98,CJ88,CJ87,CJ65,CJ45,CJ44,CK99,CK57,CK56,CK43)
- Onebody *(OJ98, OK99, OM4560, OK45, OK55, OK75)
Bulletin Type : SVC Notice Parts Others Applicable only with symptoms with every
repair
Symptoms
Disc Tray does not work when we push Disc
open or Disc close button
Picture
Cause
Open or Close signal of the models that use
MCS DSP IC is affected to each set impedance


Product : Mini / Onebody / Louder
Bulletin # :
PNZ201900013-01
Release Date : 2019.08.22

LG OJ98 Specifications

Power

bus power supply (USB) voltage	5 V
bus power supply (USB) current	500 mA
amplifier total RMS output power	1, 800 W

Weight and Dimensions

width	1099 mm
height	380 mm
depth	400 mm

Summary

Disk Open/Close Malfunction Repair

Applicable Models and Production Dates

Identifies affected MINI and Onebody models and their production cut-off dates for the issue.

Symptom and Cause Analysis

Explains the symptom (disc tray failure) and the root cause (signal impedance issue).

Repair Procedure Overview

Outlines the primary repair step: checking resistor value and replacing the Main Board.

Resistance Measurement and Diagnosis

Measuring for 4.7kΩ

Procedure to measure resistance, indicating replacement needed if approximately 4.7kΩ.

Measuring for 470Ω

Procedure to measure resistance, indicating no replacement needed if approximately 470Ω.

Model-Specific Main Board Changes by Production Date

Models Produced Before 2019.3.27

Details Main PCB EAX67173201 and resistor change for CJ98, CJ88, CJ87 models.

Models Produced Before 2019.3.29

Details Main PCB changes for CJ45, CJ44, CJ65, CK57, CK56, CK43, CK99 models.

Models Produced Before 2019.4.8

Details Main PCB changes for OJ98, OK99, OM4560, OK45, OK55, OK75 models.

Part and Warranty Information

Part Interchangeability

Details part numbers, changes, and scrap policy for Main Assembly.

Extended Warranty Policy

Information regarding extended warranty coverage for this service.