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Service Bulletin
SB Number: SB 2J0-008 Creation Date: 03/06/2010
Subject: Error code F050 due to Macronix flash memory
FS-2000D/3900DN/4000DN/6950DN/2020D/3920DN/4020DN/
Model:
6970DN
Phenomenon The commonly used Spansion flash memory at the high-voltage board has become difficult to
obtain, therefore we changed the common type to Macronix flash 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 flash memory, when
the power goes down at the power-off process due to the variation of the functional low voltage
of the flash memory. When the CPU stalls, the data may be incorrectly written to the flash
memory. Under this condition part of the program in the flash 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 microF to 0.01 microF.
(FS-2020D/3920DN/4020DN/6970DN only)
Parts
No. Old Parts New Parts Description Q'TY Interchange- SP
No. No. ability
Old New Old New
1 302F801422 302F801423 P.W.BOARD ASSY ENGINE WITH 1 1 O O O
2F801422 2F801423 SOFTWARE (SP) (For the FS-2000D)
2 302F901162 302F901163 P.W.BOARD ASSY ENGINE WITH 1 1 O O O
2F901162 2F901163 SOFTWARE (SP) (For the FS-3900DN)
3 302GA01162 302GA01163 P.W.BOARD ASSY ENGINE WITH 1 1 O O O
2GA01162 2GA01163 SOFTWARE (SP) (For the FS-4000DN)
4 302J080010 302J080011 P.W.B ASSY ENGINE WITH SOFTWARE 1 1 O O O
2J080010 2J080011 (SP) (For the FS-2020D)
5 302J180010 302J180011 P.W.B ASSY ENGINE WITH SOFTWARE 1 1 O O O
2J180010 2J180011 (SP) (For the FS-3920DN)
6 302J280010 302J280011 P.W.B ASSY ENGINE WITH SOFTWARE 1 1 O O O
2J280010 2J280011 (SP) (For the FS-4020DN)
7 302J580010 302J580011 P.W.B ASSY ENGINE WITH SOFTWARE 1 1 O O O
2J580010 2J580011 (SP) (For the FS-6970DN)
8 302F701222 302F701223 P.W.B ASSY ENGINE WITH 1 1 O O O
2F701222 2F701223 SOFTWARE(SP) (For the FS-6950DN)
KMIS Service Department, Kyocera Mita Europe Page of 3 A066 / SB 2J0-008
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 display Error code F050 on the display
Self test Self test Call service
F050:0000005
Solution: The engine high voltage board has been changed
Engine high voltage board Added red mark 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 microF to 0.01
microF.
KMIS Service Department, Kyocera Mita Europe Page 2 of 3 A066 / SB 2J0-008
Service Bulletin
Recognizing machines with the latest engine high voltage board.
A black dot has been added to the barcode label.
KMIS Service Department, Kyocera Mita Europe Page 3 of 3 A066 / SB 2J0-008