Canon GP335 Service Manual page 311

5. Download PCB
For details, see VII. "Updating" in Chapter 13.
The following table shows the operations that are enabled when connecting the download PCB
to a PCB with a by-Centronics interface.
Flash memory for IP-CPU
Flash memory for DC-CPU
Back-up RAM
To switch between copying operation and downloading operation, use the bit switch on the
download PCB.
Shift the bit switch to the right (LOAD) to select download mode. (The machine disables
copying operations.)
Shift the bit switch to the left (COPY) to select normal copying mode.
COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 EXTERNALS/AUXILIARY MECHANISMS
4M, DIMM
1M, DIMM
1M, DIMM
COPY LOAD
Figure 10-101-1
Downloading
Download
switch
Bi-Centronics
connector
Uploading
X
X
X
: Possible.
X : Not possible.
10-3