IBM 4685-K03 - Manual (Page 41)

Replacing the control card
1. Remove the rear cover. See “Replacing the rear cover” on page 22.
2. Remove the screw labeled
2 which holds the ground cable 1 and the cover.
3. Open the cover. Disconnect the cables of two sheets for the membrane 4 and the other connectors from the
control card 3 .
4. Remove the four screws labeled 5 . Remove the control card 3 .
Reverse the procedure to reassemble.
5
2
3
4
6
1
Dip Switch Setting
Before you replace the control card, please check the Dip Switch (S1)
6 setting on the control card.
On
Off
1 2 3 4
POS Keyboard Model 1 2 3 4
4685-K03 Off On On Off
4685-K02 Off Off Off On
Replacing the MSR
1. Remove the rear cover. See “Replacing the rear cover” on page 22.
2. Remove the two screws labeled
2 which hold the MSR 1 in place.
3. Disconnect the cable leading to the control card. Remove the MSR 1 .
Reverse the procedure to reassemble.
Chapter 5 Maintenance of the keyboard 25