
Page 4 11681330 Issue 1
Compatible Equipment
9853
9851
9752
9751
9651
PCB
To gain access to the PCB and its connectors, undo the screws at the bottom of
the case and lift the front away from the back plate.
Figure 2 shows the layout of the control unit PCB.
1. Sounder. 4. Volume control.
2. Tamper switch. 5. Addressing and backlight jumpers.
3. Connectors.
6. Proximity reader coil (9940 only)
Figure 2. Control Unit PCB Layout
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