need help bell 2700 vs 3100 issuie

[cessna172]

I need help troubleshooting a stacked LNB satellite system. The system is on a large building and was not installed by me. They have an old weinguard SK-0203 LNB, one or two in line amplifiers 950 - 250 MHZ.

At the headend which is on one of the lower floors, there is a power inserter Zinwel SPS1750 which powers up the in lne amps and LNB.

The output goes to a two way power passing Toner splitter which feeds 2 Sonora D575 d stackers. The output of these d stackers feed the 13 and 18 volt inputs on a powered Channel Master multi switch.

Yes, I know this stuff is old.

They have 3 receivers. 2 are model Bell 2700 receivers and 1 is a Bell 3100 receiver.

The 2 - 2700 receivers are locked on satellite 91, good signal level, picture, and says satellite locked with green bar.

The 3100 receiver gives me a signal bar around 80 but it is in red and says wrong satellite.

The channels they are receiving are 126, 501, and 502.

If I put any of these channels into the 3100 I get the red bar saying wrong satellite but if any of these channels are put into the 2700 receivers they are all green and say locked.

Can anyone tell me why this is - is there a difference between the receivers?

They had signal outage which prompted the service call and I peaked the dish but I do not understand why the 3100 is acting as it is.

Yes they need a upgraded system, better wiring, etc... but they are moving so they do not want to have to have the whole building wired.

The system is located in NYC, NY so Bell will not help me.

I did a check switch on the 3100 and it gave me over 13 volts, 18 volts XX.and sat 91

If everything holds and the bar stays red, I will be happy and just leave it.

But if I get a call back I would like to understand why the above is happening and what I can do about it since they are a good client and even if they move it will probably not be for another year.

Any help would be appreciated.