Perfecta 76UC

Hi
Perfecta 76UC. Intermittent ERROR33, manual says fault on SMS safety module replace. Any one had this problem. It will be very expensive to replace whole module
Cheers
Andy

 

Hi sir;
The safety module consists of:

- a motherboard,
- 2 CPU boards,
- a comparator board.

2) Before to replace do this;

1) Perform a visual inspection : look for loose and broken wires, improperly seated connectors, loose or broken wires
misset switch, missing jumpers. and so on.

Chech for obviously damaged component(components burned or discolore due to overheating);
Dust + dirt + tear +wear

2) Reseating Boards and components:

Edge connectors are a common souorce of problems. Power down the system and remove the PC boards. Examine the edge connector
for contamination and clean with contacts cleaner contacts. Reseat any loose components such as scoketed ICs) .

Reseat and clean very well the
boards and power up+look for dry +colder joint solder


3) Power supply checks:
Check the power supply for missing voltages and voltages out of spec. A digital multimieter DMM can be necessary, as
voltage specifications are quite tight: logic supplies for example: must be within + 5% percent of 5Vdc. All the
multiple supplies and all must be checked.

4) Measure the power supply 24Vdc for CPU, and look for pins bends, or corroded.

5) Measure the Clock,

6) Finally Reset the Cpu , attached is the schematic, how to do it