Read Sharp ER-A410 / ER-A420 (serv.man3) Service Manual online
ER-A410/ER-A420
IPL FROM EP-ROM
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CHAPTER 6. IPL FROM EP-ROM
Before working on the installation, unplug the AC code from the AC out-
let.
let.
1.
Open the top cabinet.
2.
Set the IPL switch (S1) to ROM COPY position.
3.
Install the IPL ROM to the IC socket of the MAIN PWB.
4.
Turn the mode key switch to SRV’ position, and insert AC plug in
AC outlet.
5.
Turn the mode key switch to SRV position. The IPL procedure is
started.
When the procedure is completed, the message of “Completed.” Is
shown.
shown.
6. Unplug the AC code from the AC outlet.
7. Remove the IPL ROM to the IC socket of the MAIN PWB.
8. Set the IPL switch (S1) to GND position.
9. Replace the top cabinet.
10. Perform the master reset.
Turn the mode key switch to the SRV’ position, insert AC plug in AC
outlet.
While holding down Journal feed key, turn to SRV position from
SRV’ position.
SRV’ position.
IPL switch
GND
VCC
ROM COPY
S1
S1
IPL ROM
1pin
IPL switch
GND
VCC
ROM COPY
S1
S1
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