Access ATB420 Series Service Manual page 35

Access keyboards ATB 420/421 Multi-Function Keyboard Product Specification and Service Guide
7.2.7 Replacement of main cable
Before the main cable can be replaced, the stainless steel guide plate with MSR head assembly
should be removed. Remove the 2 screws securing the guide plate to the base moulding. Also
remove the screw retaining the earth tags.
Release the flat MSR head ribbon cable and the two OCR head cables.
2 off OCR head
connectors
An insulation spacer is located below the guide assembly. Carefully lift this away.
The main cable is plugged into a connector on the main control PCB and the screen connection is
via a ring tag secured by a screw.
Note: Orientation key for cable
(Non-pointer cable is located to left
end of 16 way connector on PCB)
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2 off M3 x 6mm screws secure the
stainless steel guide to the base moulding
MSR head ribbon
connector
M3 x 4mm screw with crinkle washer
secures earth bond point. NB Fit the
washer UNDER the ring tag
Lift cable strain
relief out of base
moulding
Note: Correct
orientation of earth ring
Remove M3 x 6
screw with crinkle
washer securing
screen. Note
crinkle washer fits
under ring tag
Page 35 of 37
Insulation
Layer