Failed Salt Water Chlorinator Cell prompted me to document the circuit in my M140 chlorinator. Pretty simple…

I was able to rig up a test for the power supply using a couple of #44 bulbs and a resistor.

Yup,  working fine.  Interestingly: the failure mode for the old cell is that it appears to have a “diode” like short between the center plate and the sense pin.  I can only speculate that the calcium build up has caused this to act as a “diode”?

SRC is S2065J

Diodes are: 1N5404

This unit can pack out 18AMPS.  (Rated at 14A)

Working on a MM with fuses blowing on the sound / DMD board.

I returned the board to the workshow, but had trouble replicating the fault.  I did not have a dual tracking power-supply to power the audio amplifiers, so I was testing with current limited single supply…  no fault.

I finally jury-rigged two power supplies to provide both the positive and negative rails and bingo!  We have a short.

The TDA2030 was short circuit between the +ve and -ve rails.

These parts are no longer stocked by the mainstream electronic suppliers, but thankfully are readily available on eBay.

I ordered a new chip, waited the usual 4 weeks for delivery, and this board is now back and operational.

I did a little clean-up of the high-voltage on the DMD driver for this board.  Check out the soldering the last repairer left…

Bloody hell…  hats off for actually getting this to work!

Any-how, I felt obliged to clean this up a little without spending too much time on it…