Toshiba SFB0034 Service Note

Publish Date: 2000/11/14

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BSI No.: SFB0034
Subject: Application of New LED ( Remind )

Model: TF531, TF551

Category Field Application Unit

General Information for the Field To be applied when necessary PCB/PSU

Factory Application:

CONTENT

TRC board is changed in or after October, 1994.

As a result of investigating, the interchangeability of TRC & LED is as the following table.
USA/CA/TWN

TRC PC Board LED Head

PWB Ver. ROM Ver. IC28 OKI STANLEY

B4 or before THSC0508A OK NG

TF531, LUOF003A THSC0711 OK NG

TF551, LUOF001C B5 or later THSC0508A OK NG

THSC0711 OK NG

B4 or before THSC0508A OK NG
TF531, LUOF007A THSC0711 OK NG
TF551, LUOF006A B5 or later THSC0508A OK NG

THSC0711 OK OK

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GER/EUR/UK

TRC PC Board LED Head

PWB Ver. ROM Ver. IC28 OKI STANLEY

A3 or before THSC0508A OK NG

TF531/551,

LUOF004B

TF531/551,
LUOF004C

A4 or later THSC0508A OK NG

THSC0711 OK NG

THSC0711 OK OK

AU/ASIA

TRC PC Board LED Head

PWB Ver. ROM Ver. IC28 OKI STANLEY

A4 or before THSC0508A OK NG

TF531/551,

LUOF004B

TF531/551,
LUOF004C

Even when it attaches a new TRC PC Board in the machine with which old LED head is set, it
operates.
However, TRC board attached in the machine sets on new LED head is set fulfills the following
conditions.
The TRC PC Board Part No. is not changed.

<US/CA/TW>
Type Name of IC28 on the TRC: THSC0711
ROM Version: B5
TRC PC Board Edition: LUOF007A (TF531) / LUOF006A ((TF551)

<GER/EUR/UK/TAP/ASIA>
Type Name of IC28 on the TRC: THSC0711
ROM Version: A4 (GER/EUR/UK), A5 (TAP/ASIA)
TRC PC Board Edition: LUOF004B or C

A5 or later THSC0508A OK NG

THSC0711 OK NG

THSC0711 OK OK

LED head made from OKI is not manufactured now, and cannot be supplied.
When exchange of LED head is needed on the machine manufactured before October, 1994,
please also exchange TRC board for new TRC.
The ROM on the exchange of TRC is using latest version ROM.

Written by N. Sasahara

Attached Files

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