Oki MC770 - Page 134

45584901TH Rev.1
5-41 /
Oki Data CONFIDENTIAL
[F071] Communication initialization error between CU board and PU board
Classification Error content
Communication related
service call
Communication initialization error between CU board and PU board
Proce-
dure
Check item Measures
1
LEDhead,harness 1-1.DisconnectalltheharnessesoftheLEDheads,andthenturn
the power ON. Check if the error changes to another service call.
(HEAD0K,HEAD1Y,HEAD2M,HEAD3C)
1-2.Iftheerrordoesnotchangetoanotherservicecallinstep1-1,goto
step2.Iftheerrorchangestoanotherservicecall,followthesteps
below.
1-3.ConnecttheharnessesoftheLEDheadtothePUboardsingle
coloratatime,andthenturnthepowerONtoidentifytheLEDhead
in error. Check if F071 occurs. Place the parts causing the error.
Ycolor:HEAD1Y
M color: HEAD2M
C color: HEAD3C
Kcolor:HEAD0K
2
Check firmware
version
• ChecktheversionofthesystemrmwareontheCUboard.
• ChecktheversionofthePUrmwareonthePUboard.
3
Board check • CheckiftheconnectorCN118,CN119ontheCUboardandthe
connectorCUIF0,CUIF1onthePUboardarecompletelyinserted.
• CheckiftheconnectorpinbetweentheCUboard(connectorCN118,
CN119)andthePUboard(connectorCUIF0,CUIF1)isdisconnected.
• CheckiftheconnectorsHEAD0K,HEAD1Y,HEAD2M,andHEAD3C
oftheLEDheadarecompletelyinserted,andtheharnessis
disconnected or open circuited.
• CheckiftheconductorpatternsonthePUboardandCUboardare
short circuited or open circuited
Parts to be replaced Remark
PU board
CU board
LEDhead
HarnessofLEDhead