MX-2640N, MX-2640NR, MX-2640FN, MX-3140N, MX-3140NR, MX-3140FN, MX-3640N, MX-3640NR, MX-3640FN (serv.man110). IMPORTANT Handling of EEPROM's. - Sharp Copying Equipment Technical Bulletin (repair manual). Page 4

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Sharp Electronics (UK) Ltd., Document Systems Support
 
 
 
4/5 
 
No. 
Cautions for handling 
Cases reported in the past 
Coutnermeasure etc. 
Wear a ground strap to 
handle PWBs. 
EEPROM data may be garbled due to static 
charge. 
(Please refer to the Service Manual “Note for 
handling PWB and electronic parts” in “NOTE FOR 
SERVICING”.) 
Do not insert EEPROM 
into the socket facing 
the opposite direction 
“U2 trouble” occurs 100% if you turn on the device 
while mounting the EEPROM facing the opposite 
direction. The EEPROM may be damaged due to 
excessively high temperature. 
The data may be garbled even if you could avoid 
the damage. 
When Sim 16 is executed to clear the “U2 trouble”, 
the garbled data may result. 
It is impossible to repair in field once the data are 
garbled. 
Step 1: Don’t execute Sim 
16.Turn off the power and 
mount the EEPROM facing 
the proper direction. 
Step 2: Execute Sim 16 to 
clear “U2 trouble”. 
Do not mount 
EEPROM on different 
PWB (among PCU, 
MFP, Scanner PWB 
etc.) 
“U2 trouble” occurs 100% if you turn on the device 
while mounting the EEPROM in improper location. 
In addition, the data may be garbled.   
When Sim 16 is executed to clear “U2 trouble”, the 
garbled data may result. 
It is impossible to repair in field once the data are 
garbled. 
Do not bend pins 
around EEPROM 
The pins may be bent if the EEPROM is 
detached/mounted several times. 
Do not use styrene 
foam for transportation 
of EEPROM. 
Styrene foam can generate static charge easily. 
There are cases where EEPROM is damaged just 
by inserting the EEPROM into the styrene foam. 
Use black sponge used for 
packing of service parts 
EEPROM for transportation. 
This sponge is made with 
special material which does 
not generate static charge. 
 
 
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