Duplo DFC-12 error

[ROBERT ROTARU]

Hello everybody, i have this error on Duplo DFC-12. Can anybody tell me how can solve?

 

[CHOCK]

Hi sir<

I will suggest to disconnect the connector in the downstream unit, with the machine OFF.

Wait 30 sec, and connect again, please be sure the connector is clean, tight, NOT corroded pins, or bent, otherwise fix it.

 

[ROBERT ROTARU]

thanks, i tried, but no change.

 

[CHOCK]

I believe that you tried only by disconnecting, BUT you do not clean it, and see if the are dirty, corrosion, pins bent, loose, wires cut, or bad contacts. Did you do that sir?

However Try 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 the
boards and power up.
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) Board swapping:
Board swapping involves the substitutiono of a known godd board for a suspect one.
5) Clock for CPU:
Check the frecuency with frequency counter or a DMM included frecuency counter( like Fluke DMM)
6)Reset CPU:
reset cpu see the attached schematic.