How to replace
Removal
1 • Remove the following covers:
Lamp cover A and back cover B, (section 4•2 steps 1-2).
2 • Remove the two 2.5 mm countersunk screws A on each side of the hard-
ware unit and carefully slide the unit partially out.
3 • Disconnect connector J4 and the connector to the two ventilation fans
from the driver board.
4 • Disconnect the large white power connector to the transformer.
5 • Disconnect connector J20, (green) or J21, (black) from the control board.
Note: earlier model scanners use J20, (green)- see the note in step 9 below.
6 • Carefully slide the hardware unit out of its tray.
Assembly
7 • Mount the new hardware unit onto its tray and slide it partially in.
8 • Connect the large white power connector to the transformer.
9 • Connect connector J20, (green) or J21, (black) to the control board.
Note: If J20, (green) is used, it is possible to fit both ways. If fitted in-
correctly, it will cause the amplifiers in the PMT module to blow. Ensure
that the locking tabs on the connector fit into the locks on the control
board, (that is, facing to the right hand side viewed from the back of the
scanner).
10 • Connect connector J4 and the connector from the two ventilation fans
to the driver board.
11 • Carry out the adjustment and test operations specified below.
12 • Slide the hardware unit fully in (connector J1 on the driver board mates
with the backplane) and fit the two 2.5 mm countersunk allen screws A
on each side of the unit.
13 • If no further replacement operations are required refit the covers rem-
oved in step 1 in accordance with section 4•2.
Adjustments and tests required
White calibration in transmission and reflection (section 5•5).
Focus calibration (section 5•4).
Service Manual • ScanMate 4000/5000 Edition 1 • January 1996
Hardware Unit
4•5b
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