Graseby 3000/500, Manual

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8 — 5
G r a s e b y M e d i c a l L t d .
3 0 0 0 / 3 1 0 0 a n d 5 0 0 / 5 0 5 S e r v i c e M a n u a l
V o l u m e t r i c I n f u s i o n P u m p s
8
I s s u e A ( A p r i l 2 0 0 2 )
CPU/Power supply board removal
Disconnect the battery connection P104 on the I/O board before
disassembling the circuit boards to avoid circuit damage. After
disconnecting P104, press the On/Off key twice to discharge the
circuitry.
To remove the CPU/Power supply, I/O board, or RS232 board:
Remove the Front housing as detailed above.
Disconnect SPI cable from P200.
On the rear of the pump, remove the threaded Keypad lockout button
nut (turn counter-clockwise) and the internal tooth washer.
Remove the audio volume knob and nut.
Remove the two screws from the RS232 connector.
From inside the rear cover, disconnect the brown and blue RFI line
filter wires from the CPU/Power supply board.
Slide the CPU/Power supply out of the rear cover.
Reassemble in reverse to the procedures detailed above.
Before replacing the screws in the pump housing, perform the
functional and accuracy check. If the check is satisfactory, finalise the
housing reassembly.
WARNING: Unplug the AC power cord before opening the pump housing to avoid risk of electric
shock, which could result in death or serious injury.
CAUTION: Handling of printed circuit boards is required during disassembly/assembly. A static
controlled work station including a conductive mat and grounded wrist strap should be
used to provide protection against electrostatic discharge (ESD) or circuit board damage
could result.