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| Modifying the SC546 Chime Module
I have successfully completed this modification
once, however, and I accept no
responsibility for the effects of anyone making these modifications.
You follow these instructions at your own risk.
- Open the module by removing the four screws and take out the pcb
(Printed Circuit Board).
- Change the big, usually blue, 1.0uF 250V capacitor normally marked
1.0K 250V to 0.47uF 400V
- Change the 330k 0.25W resistor close to the incoming power to 330k
0.5W.
- Change the MOV close to the incoming power from 130V RMS to 250V RMS
if you have 220V and to 275V if your power supply is 230V or 240V.
- Change the 10 Ohm 0.5W resistor mounted close to the small
transformer to 22 Ohm 1W.
- Change the incoming plug or use an adapter, reassemble.
If you attempt these modifications, please let me
know your results, and read the warning on the X-10
240 volt modifications page. |
Page created on March 13, 1999, last
revised: November 29, 2006.
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Redoak
e-mail address