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Temperature alarm in POD

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sebastian:
Hi all,

after restoring my sinclair c5 (https://plus.google.com/photos/102914470871796640086/albums/5800744213002721249) I have not used it for three month, now I wanted to reactivate it and it shows a motor temperature alarm. The left side of the POD is flashing. I have found the exact alarm here:

http://c5alive.co.uk/forum/index.php/topic,723.msg5860.html#msg5860

After reading this I have replaced all electrolyt capacitors in the POD, but the error is still alive. Opening the control box all seems fine. Fuses are ok, and the C2 capacitor seems to work. Now I have checked the two thermal resistors by disconnecting it and checking the values. First: Do they work as normal resistors? Because the inner sensor have 16kOhm, the outer seems to have 0Ohm. Very strange. Do anyone know the "normal" values?

What I want to check next is to replace the thermal sensors with static resistors. Can this work for a test? But what values...

Next is to replace C2 in the control box, but this I want to do after all the other testing.

Anyone have better ideas to check where the alarm comes from?

Thanks a lot!
Sebastian

sebastian:
Ok, I have now replaced the C2 on the Control Board, and I have tried to replace the temperature sensors with two 10kOhm resistors. Same alarm  :( Now I have no new ideas where the mistake could be. Next is to check all wires between CB and POD. But anyone more ideas?

Thanks, Sebastian

radiomarty:
Hi check the op amp in the control box- Regards Marty

gertk:
The outside 'sensor' is a simple thermal switch (like a thermostat) and should read 0 ohms when cold.

sebastian:
Hi,

thank you, I will replace the IC now, and look what happens! Will inform you again, thanks ;-)

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