13900-103 Rev. A Page 39
Repair 7
Motor Board Replacement
This section details the steps necessary to remove/
replace the Motor Board.
CAUTION: THE INTERNAL CIRCUITS OF THIS INSTRUMENT
HAVE ELECTROSTATIC DISCHARGE SENSITIVE
DEVICES (ESDS) AND ARE SENSITIVE TO STATIC
HIGH VOLTAGES STORED IN AND TRANSFERRED
BY THE HUMAN BODY. OBSERVE CORRECT ESDS
PRECAUTIONS OR PREMATURE MALFUNCTION
OF THIS INSTRUMENT WILL OCCUR.
Control Board Removal
1. Install identification tags to the connectors which
attach to the Motor Circuit Board (MCB) as the
connectors across the top of the MCB have the same
colors and will phisically interchange, but will show
error codes if power is applied to the unit and the
connectors are not correctly attached.
2. Remove the four screws, which attach the MCB to
the XYZ support bracket.
3. Remove the plastic tie-wrap which secures the wires
from the XYZ Assembly to the J4 connector on the
MCB.
4. Observe ESD precautions and remove the new MCB
from its anti-static bag. Disconnect one connector
from the damaged MCB and install it onto the new
MCB. Repeat this step until all connectors are
installed onto the new MCB.
5. If the new MCB does not have a chips in its XU5, XU6,
and XU7 sockets, remove them from the damaged
CCB and install them onto the new CCB. Place the
damaged MCB into the anti-static bag.
6. Secure the new MCB onto the XYZ support bracket
using the four screws which were removed.
7. Ensure that potentiometers, R15 and R19, are set fully
clockwise (10:00, 4:00 position) on the MCB.
8. Attach a plastic tie-wrap to secure the sensor wires
of the XYZ Assembly to the J4 connector on the MCB.
9. Perform the steps in the Assembly section of this
manual for final assembly.
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