Graseby 3000/500, Manual

Page: 136 / 231

8 — 7
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 )
Display board assembly removal
Remove the Front housing as detailed on page 8-2.
Open the door. Remove the two screws from the door latch/handle
and then remove the handle. Remove the four screws from the rear
door housing.
Separate the front and rear door housings, slightly, then disconnect
the wire assemblies from the pressure transducer and pressure plate
switch.
Disconnect the SPI cable from the Display board P401 and carefully
remove the membrane switch ribbon cable from the Display board
J401. Remove the Display board and LCD by carefully bending the
retaining nibs (4 off).
Reverse the above process for reassembly, ensuring that the ESD
cover slides into the front pump housing and that the rubber seal
around the SPI cable is correctly seated.
If a replacement Display board is fitted, the occlusion alarm
adjustments (page 8-20) must be carried out prior to using the pump.
Also, to obtain satisfactory LCD contrast trimpot R402 (nearest the
door hinge) may require adjustment.
Note: If the LCD is to be replaced, you must first identify whether or not the
pump is fitted with the older “EL type” display. The procedure for
identifying the LCD type, and modifying the display board if necessary, is
described in Chapter 7, Troubleshooting section.
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: Do not use a screwdriver or other sharp instrument to separate the front and rear housing
as this action could cause pump damage.
CAUTION: Disconnect the battery connection P104 on 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.
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.