Specifications

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Reinstall the controller board after reinstalling any of the following
options: a SIMM upgrade, an optional internal hard disk, the Kanji
option, an optional network, an optional LocalTalk interface, an optional
serial interface, a Multi-Res daughterboard, and the option controller.
0 WARNING The options which require access to the controller board
should be performed only by a qualified QMS service technician.
ACHTUNG! Arbeiten am QMS Controller sollten nur von
qualifiziertem Servicepersonal durchgeführt werden.
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Use the following procedure to reinstall the controller board.
▲ Caution: It's very important to protect the printer controller board
from electrostatic damage while performing this task.
If an anti-static wrist strap is provided in your printer option kit,
attach one end of it to your wrist and the other end to any convenient
electrical ground (for example, the bare metal chassis of equipment,
as on the back of a computer, that is plugged in but  turned off).
Never attach the wrist strap to any piece of equipment with an
electrical current present. Turn off all power switches first. Plastic,
rubber, wood, painted metal surfaces, and telephones are not
acceptable grounding points. The printer isn't an acceptable
grounding point either because it must be unplugged before you
perform this task.
If you don't have an anti-static wrist strap, discharge your body's
static electric charge by touching a grounded surface before you
handle any printer boards or components and before removing the
controller board cover. Also avoid walking around after grounding
yourself.