Oce 3121 Technical & Service Manual page 466

Fax Controller Board
Notation Description
J1
J5
J6
J7
J100
LED1
SW1
SW2
NCU Board
230V Areas (outside France)
514 TSM Océ 3121
Speaker connector
NCU interface connector
RAM-A (for page memory); when installed, it enables the use of
Super Fine and Ultra Fine modes. Its installation must be followed
by installation of RAM-B. (3MB)
RAM-B (for image memory); when installed, it provides more space
for storing transmission/ reception images. (3MB or 9MB).
Fax Motherboard Interface connector
Remains ON ehen 5V is being supplied normally
For factory adjustment; be sure it is OFF
Use it for back-up. Turn it off once when installing expansion mem-
ory; then, turn in on at the end of the work (toward 3, for back-up). If
the board is to be installed as an accessory (post-installation) to the
Océ 3121, be sure to shift SW2 from OFF to 3 at time of installation.
Functional description