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Welcome to the CyBENCH Project Pages - 4bit RF remote


Part 2 - Opening and stripping the main alarm unit

1. Remove the two screws that hold the case together (Accessed from the rear of the unit)

2. Split the case and open it.

3. Cut the wires, at the pcb, connecting the sounder to the pcb.

4. Cut the black wire that connects the pcb to the mounting nut in the rear shell

5. DO NOT CUT THE BLUE WIRE

CASE OPEN

BLUE WIRE

6. Now, begin to strip off the unwanted components, keep them safe though.

Note: all solid wire links have been left in place.

Hint
You can simply heat the solder pads and pull the component out with a small pair of pliers

The following three pictures show a stripped pcb in detail.
(power connections are shown on IC4 pins 4 and 8, explained later)

upper stripped pcb

lower left stripped pcb

lower right stripped pcb


Follow the above pictures very carefully.


If you did the job right, you'll have this:

all stripped pcb

NOTE: T4 has been left in place for later use.