Chassis trouble

[Jonewyn2]

I have 6800 elco chassis with omega tek boards. I have 2 chassis(or chassi) giving me trouble.
1st chassis was blowing the f1 fuse. I replaced all my c1 pins and checked all wires for breaks or shorts. I replaced my m1&m2 relays, back end relay, table and sweep contactors, t2 transformer, all 3 fuses, circuit board with known working ones with no change. I ordered and installed a new t1 transformer, f1 fuse no longer blows but nothing runs. When connected to a machine, the pin deck light turns on and thats it. I am able to manually run back end, table and sweep by relay or contactors but not from anywhere else. Now I am lost.
2nd chassis pops the circuit breaker on the managers control box. I checked all my low voltages wires dor breaks or shorts and all my c2a pins and connections seem to be ok. This one is new to me so I am unsure what to check for next.
Any help is appreciated...thanks.

[StunedM]

For the first chassis id suggest checking the M1, M2 and possibly the SP relay sockets and pins, I had a similar issue that I ended up tracing the problem to the one of the pins on the M1 relay socket in the chassis. Also it is possible that the old transformer had killed the new relays if the current was to much hence blowing the fuse consistently, just double check with known good and working relays.

As for the second chassis, if its popping the circuit breaker then id suggest looking at the C1 plug or wires for the C1 as I doubt that the C2 being low voltage would be popping a circuit breaker, if your popping a circuit breaker then chances are it will be something in the high voltage area of the chassis.

I hate chassis's.....they are the only thing that cant be fixed with a hammer, although that dose depend on your definition of fixing something.

[Jonewyn2]

I was told the breaker that was tripping had to do with low voltage for the managers control box. I will check into the C1today when I go in. And try new relays in the other chassis.

[Tablejam]

For the first chassis, T1 was replaced, is it wired correctly?

For the second, the breaker in the rear control box has not only the spot solenoid running through it but 'other' high voltages as well, if I remember correctly. If that breaker trips then I doubt it would be a low voltage or C2 issue.

[triac]

I was told the breaker that was tripping had to do with low voltage for the managers control box. I will check into the C1today when I go in. And try new relays in the other chassis.

The mechanics control box breaker has low and high voltage running thru it.

For the high side, check continuity from C1-44 (or m #6, same circuit wire)to ground . If good (open) then check M #7 terminal to ground. Next you need to check continuity from all neutral inputs (C1-34,21,13 &16)to to ground. These neutrals run to various components that could also cause the short. If no shorts, (all open) then you need to move on to the low voltage side.

Low voltage side would be a short to ground on the T2 secondary side. This could be a bad T2 or a short in the M,M2 or BE relay coils. If it trips during spotting then the diode on the spot relay socket is fused closed or touching ground.

Now for your first chassis….It sounds to me like you don’t have the replacement T1 wired correctly. The new ones are 50 Hz(but will work for 60Hz)and I believe they have an extra set of primary wires. I can’t remember if they are to be wired in series or parallel with each other. However If you do get it sorted out and start blowing the F1 again, then most likely, you have a blown power diode or a short to the heat sink.

[AMF Brian]

I had to recently replace the T1 transformer on a chassis and had the same problem as you did, where the deck light would come on and nothing else.
The wiring that worked was to connect the black and black/yellow together and the black/red and black/green together.

[StunedM]

Have a look at the breaker, if is under 5 amps then its a low voltage and if its over 5 amps then it is a high voltage breaker, that is the simplest way to narrow your search down.

[wb8yjf]

For the first chassis, T1 was replaced, is it wired correctly?

For the second, the breaker in the rear control box has not only the spot solenoid running through it but 'other' high voltages as well, if I remember correctly. If that breaker trips then I doubt it would be a low voltage or C2 issue.

Good point - some transformer wires have faded a lot over the years, the green and the blue wires can look VERY similar. Many times a failing T1 will cause the B.E. box to trip 'slowly' - in other words it will power up for about 15-20 seconds then trip. A bad KX relay can also cause this (I remove them all).

[wb8yjf]

I had to recently replace the T1 transformer on a chassis and had the same problem as you did, where the deck light would come on and nothing else.
The wiring that worked was to connect the black and black/yellow together and the black/red and black/green together.

That is a dual primary type transformer (120/220V).