Gestetner A193 Service Manual page 687


3. FCU
CAUTION
If the machine has an optional Function Upgrade Card, change bit 7 of
the System Switch 1E to "1" before performing the following
procedure. This will prevent the data on the Function Upgrade Card
from being erased.
Be sure to put the bit switch back to zero before step 18 below,
otherwise the fax unit will not start up without the card installed.
If the bit switch can not be changed, do not press "Yes" when the
caution is displayed or data will be lost.
1. Follow steps 1 through 3 in the NCU removal section above.
2. Disconnect the harnesses from CN500, CN505 and CN5110 on the FCU.
3. Remove the bracket [A] (2 screws) and the FCU [B] (5 screws).
NOTE: If optional units, such as IC cards or the Hard Disk, are installed on
the old FCU, remove the cards all and install them in the new FCU.
4. Turn on the new FCU's battery switch (SW1) and install it.
NOTE: The FCU's battery switch (SW1) must be turned on at installation. If
the switch is not truned on, all data programmed in the SRAM will
be erased when the ac switch is turned off or a power failure
occurs.
5. Replace the bracket [A] and the NCU.
6. Turn on the ac and main switches. When the caution message
("Functional Problem - SC1201") is displayed, press, "Yes."
7. Turn off the main and ac switches.
8. Turn off the machine's ac switch.
(A639)
[B]
5-3
[A]
A194R501.wmf
FCU
SM