Raymarine C120 Radar - No Data Source

[Parabordi]

I have tried the DIags on the Radar and get this screen:-

What does RECEIVER SUPPLY 12V mean? is it the Radome/scanner or the MFD? I need to know where to check why the 12v has failed.

 

[[164147]]

That's the Intermediate Frequency Receiver. The supply comes from the main MOD/PSU PCB. Check the ribbon connector for corrosion - you can measure 12v coming from the board (or not). It will either be a poor connection, failed IF receiver or main board.

 

[[164147]]

In the radar itself - not the MFD.

 

[yotter]

If its the IF receiver board spares then are pretty hard to get hold of.

 

[[164147]]

If it's the older M92650-S I might have a spare. I also have an RD218 which would be a direct swap otherwise.

 

[Parabordi]

That's the Intermediate Frequency Receiver. The supply comes from the main MOD/PSU PCB. Check the ribbon connector for corrosion - you can measure 12v coming from the board (or not). It will either be a poor connection, failed IF receiver or main board.

I tried a lithium power pack direct to power in on mfd to ensure good voltage, was getting 13.5 at radome with avo. Same error.
How do i get the power ribbon out to clean it, i did not want to break it.
Do i need to unscrew the radome circuit to get to the underside?

 

[[164147]]

You have to take the alloy radar assembly out of the plastic radome to access it from the bottom. There are high voltages and large capacitors in there so don't do anything without disconnecting the power and waiting for them to discharge.

 

[[164147]]

I'm assuming it's the older model - you haven't confirmed what radar it is you have?

 

[Parabordi]

I'm assuming it's the older model - you haven't confirmed what radar it is you have?

C120 and 2Kw ANalog Dome

 

[Parabordi]

You have to take the alloy radar assembly out of the plastic radome to access it from the bottom. There are high voltages and large capacitors in there so don't do anything without disconnecting the power and waiting for them to discharge.

yeah I thought it looked like that was the case, ok job for another day, many thanks for your help!

 

[[164147]]

C120 and 2Kw ANalog Dome

Unfortunately that doesn't confirm which model radome you have. Does the case have visible screws in the lid?

 

[Parabordi]

do these help?

 

[Parabordi]

Unfortunately that doesn't confirm which model radome you have. Does the case have visible screws in the lid?

screws in the radome are in the base not the lid

 

[[164147]]

OK so it's the older Pathfinder M92650-s

 

[Parabordi]

If it's the older M92650-S I might have a spare. I also have an RD218 which would be a direct swap otherwise.

How can i tell if its the IF board thats failed?

 

[[164147]]

You will measure 12v from the main board showing power is being supplied but not registering through the IF Receiver.

 

[Parabordi]

You will measure 12v from the main board showing power is being supplied but not registering through the IF Receiver.

I have 12v supplied, i guess when you say "not registering" you mean the error i am getting?
Looks like IF receiver has gone then.

 

[[164147]]

Yes - it's not uncommon - especially given the age of the unit. The LNC, magnetron, motor and MOD/PSU board all give up at some point - usually because of water ingress / corrosion.

 

[Parabordi]

Yes - it's not uncommon - especially given the age of the unit. The LNC, magnetron, motor and MOD/PSU board all give up at some point - usually because of water ingress / corrosion.

QUick question, are the later Analog radomes with the screws in the lid any better/more reliable? Looking on EBAY for a replacement dome and there are Pathfinder and the newers ones.

 

[[164147]]

The later RD218 is more reliable in my experience with completely different internals. I have one for sale in the classifieds as it happens if you're interested though you might also want to try and find an old Pathfinder for parts for a repair.