Buzzing solenoid expander board relay SS Bally

[DRD]

Just started this morning. It is not making simple, clean connections. It is oscillating, so sending the playfield lights into a frenzy and upsetting the main transformer too.

I have reflowed the pins on it. And then I put the expanded board in another game, it works fine in the other game. So I conclude the solenoid expander board itself is fine. So I think that it is the game that is not sending the right signal to it to get the coil to energise properly in the relay

This board is getting a good ground and is also receiving 44.1v, both measured at the pins of the little board

Does anyone know what the fix might be pls ?

Thanks

 

[carl lawrence]

is the lamp next to the board working ?
the expander board is controlled by the lamp board .
i think by memery is the yellow and brown wire which goes to the bottom right of the lamp board i think
could just be a bad contection there

 

[DRD]

Hi. The lamp is working. I have traced the driver of the solenoid expander board to the lamp driver board. No have reflowed solder to pins on the lamp driver board. That did not sort it, so I am now going to do a transistor swap to see if that sorts it

These solenoid expander boards eh ?

 

[carl lawrence]

does the board click it test ?

J3 pin 25 on lamp board Q38

 

[DRD]

Hi. I have found the problem. It is to do with the power supply and the voltage it supplies to the feature lamps. This also goes to the buzzing relay on the expander board

The main game transformer/ power supply itself was humming, far more than normal. At this time I checked the feature light voltage on the power module in the cabinet using the test points. It was only about 3v.

Then the transformer hum stopped on its own, no idea why, but the voltage to the feature lights is now 7v.

The relay on the expander board in now clicking and working properly!!!!!

Any idea how I fix the noisy power supply ?

I am getting all these niggles as I have been testing all my games ahead of the league tomorrow. So they have had more use and more time just stood when powered up

 

[replicas]

You see, telling us how reliable Vector was it put the mockas on it.

 

[DRD]

Fixed. I had the midlands league round yesterday. Terry and Dave kindly sorted it for me.

Was a fried bridge rectifier (BR). Some moron had replaced a failed component in the past with a totally inadequate one. The 2x BR on the power module are hidden from sight on the underside of the board and designed to be bolted through and squeezed down to a metal panel on the base of the game which acts as a heat sink. The inadequate BR was too thin to even touch the metal panel

We pillaged a similar sized BR from a spare wpc board I had so Vector could do its thing again