Kyocera FS-2020, FS-6970, FS-3920, FS-4020 Service Bulletin 2J0 008 error F050

Service Bulletin

SB Number:

Subject:

SB 2J0-008

Error code F050 due to Macronix ash memory

Creation Date: 03/06/2010

FS-2000D/3900DN/4000DN/6950DN/2020D/3920DN/4020DN/

Model:

6970DN

Phenomenon The commonly used Spansion ash memory at the high-voltage board has become difcult to

obtain, therefore we changed the common type to Macronix ash memory. Due to the above mentioned change, error code F050 (Engine PWB ROM checksum error) may be displayed after turning on the main switch. The above mentioned error can not be cleared by turining the main switch OFF and ON.

Cause The CPU may stall due to garbled read-out of the data from the Macronix ash memory, when

the power goes down at the power-off process due to the variation of the functional low voltage of the ash memory. When the CPU stalls, the data may be incorrectly written to the ash memory. Under this condition part of the program in the ash memory may disappear and therefore start up failure may occur when the main switch is turned ON.

Solution The engine high voltage board has been changed as follows:

1. The voltage of the reset IC (U5) has been changed from 3.9V to 4.2V.

2. The capacity of the chip capacitor (C14) has been changed from 0.1 microμF to 0.01 microμF. (FS-2020D/3920DN/4020DN/6970DN only)

Parts

No. Old Parts

No.

1 302F801422

2F801422

2 302F901162

2F901162

3 302GA01162

2GA01162

4 302J080010

2J080010

5 302J180010

2J180010

6 302J280010

2J280010

7 302J580010

2J580010

8 302F701222

2F701222

New Parts No.

302F801423 2F801423

302F901163 2F901163

302GA01163 2GA01163

302J080011 2J080011

302J180011 2J180011

302J280011 2J280011

302J580011 2J580011

302F701223 2F701223

Description Q’TY Interchange-

ability

Old New Old New

P.W.BOARD ASSY ENGINE WITH SOFTWARE (SP) (For the FS-2000D)

P.W.BOARD ASSY ENGINE WITH SOFTWARE (SP) (For the FS-3900DN)

P.W.BOARD ASSY ENGINE WITH SOFTWARE (SP) (For the FS-4000DN)

P.W.B ASSY ENGINE WITH SOFTWARE (SP) (For the FS-2020D)

P.W.B ASSY ENGINE WITH SOFTWARE (SP) (For the FS-3920DN)

P.W.B ASSY ENGINE WITH SOFTWARE (SP) (For the FS-4020DN)

P.W.B ASSY ENGINE WITH SOFTWARE (SP) (For the FS-6970DN)

P.W.B ASSY ENGINE WITH SOFTWARE(SP) (For the FS-6950DN)

1 1 O O O

KMIS Service Department, Kyocera Mita Europe A066 / SB 2J0-008

Page 1 of 3

Service Bulletin

Serial numbers of affected machines

Type Serial number

FS-2020D XEX0136030 / XEX0147420

FS-3920DN XEY0135916

FS-4020DN XEZ0114988 / XEZ0115558

FS-6970DN XAA0102305 / XAA0102357 / XAA0102369 /

XAA0102376

The above mentioned changes have been applied to machines produced after the above mentioned serial numbers.

Phenomenon: Error code F050 (Engine PWB ROM) may be displayed after turning on the main switch.

Power on

Self test

Solution: The engine high voltage board has been changed

Engine high voltage board Added red mark

Self test display

Self test

Error code F050 on the display

Call service F050:0000005

The voltage of the reset IC (U5) has been changed from 3.9V to 4.2V.

The capacity of the chip capacitor (C14) has been changed from 0.1 microμF to 0.01 microμF.

KMIS Service Department, Kyocera Mita Europe A066 / SB 2J0-008

Page 2 of 3

+ 1 hidden pages