(Topic ID: 252278)

Fire and Power Lights on all the time

By abendix

4 years ago


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  • 20 posts
  • 6 Pinsiders participating
  • Latest reply 4 years ago by abendix
  • Topic is favorited by 1 Pinsider

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#1 4 years ago

Hi

I'm trying to bring an old clunker of a Firepower back to life and have a strange issue. The Fire and Power flasher lights are on at all times - they don't go off as though they are part of the GI. I have checked the transistors for these lights on the controller board and they look ok. As you can guess from my post I'm not highly technical but can manage the basic things.

Any suggestions on what to try /look for will be appreciated.

Thanks

#3 4 years ago
Quoted from slochar:

That is by design there's supposed to be resistors under the PF near the flashers that keep each flash very SLIGHTLY on (although you shouldn't be able to see it brightly....) - the theory at the time was that with the flashers pre-warmed, they would last longer when the higher voltage pulse went through them.
If they have been replaced with LED's this might be an issue because LEDs are ON or OFF, and the warming voltage might be enough to light them. If they are regular flasher bulbs, the resistors might be out of spec and are in need of replacement.

The globes are original but are on fully (i.e. bright) - ant other thoughts?

Thanks

#5 4 years ago
Quoted from YeOldPinPlayer:

How much voltage are you getting at the light socket?

13.2v

#7 4 years ago
Quoted from snyper2099:

What resistance (ohms) do the resistors read with your meter?

Big one is 339 and small one is 1.1

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#9 4 years ago
Quoted from snyper2099:

Hmmm, have you tried different flasher bulbs that you know work properly? I ask because you described as an old klunker. I can imagine someone just throwing in whatever bulbs they had laying around. What type bulb is printed on the glass globes?

The globes don't have anything on them but they look ok.

Should there be so much voltage at the board?

#14 4 years ago
Quoted from PINTEC:

Suspect solenoid output circuit 15 Flash Lamps signal is stuck on:
Unplug 2J9 on the driverboard (Lower left bottom plug) to check if they are now off.

Yep - lights out when unplugged.

#16 4 years ago

I am thinking it probably is the transistor because if I ground out the relevant pin on the plug, the lights flash as they should. With the plug unplugged I can see the faint glow on the globes as expected as well. I will get some tomorrow and give it a go.

#17 4 years ago

Replacing the trani's didn't make any difference

Question - If I connect a globe to a power source and the earth to the driver board and do a solenoid test on that pin, will it test if the board is operating correctly or not? It may be un-authodox but I want to confirm if the board is the problem or wiring.

#20 4 years ago

Replacing one of the 7408 chips (IC4) fixed the problem. Thank you for your help everyone.

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