Schematics for old Comar CSB200 AIS transceiver?

[moyd]

Trying to fix a problem with the 6V power rail on the board. Regulator is generating 6V nicely and I measure 6V on several locations on the board. But the ASIC is detecting a voltage fluctuating between 2,7 and 5,4V and thus throwing an error and not sending position (Receiving works fine)

Without schematics its hard to trace down possible culprits. Not even sure where the voltage detection occurs. Already contacted the manufacturer with no luck so far.

This using uses a OEM board from SRT Marine, as does several other units from this time period (2006-2010'ish), so any schematics from other vendors are of interest

Appreciate any assistance! (I know this unit is old and its really not worth the time to try repairing it, but this is more of a challenge/project then anything else)

[rwidman]

As a retired electronic technician, I can tell you that repairing electronics at the component level is rarely practiced any more. If you took that to a shop or sent it to the manufacturer, they would most likely replace the circuit board. Perhaps you can do that.

And, you can't legally repair this device (in the USA) anyway without an FCC license.

As a practical matter, you can replace the entire device for a few hundred dollars, know for certain that it works and go boating.

[GordMay]

What Ron said.

The ‘Installation and Instruction Guide’ is fairly detailed, and includes descriptions of the LED indications [power], but doesn’t include a schematic.
➥http://busse-yachtshop.de/pdf/comar-CSB200-manual.pdf
➥ https://comarsystems.com/download/csb200-manual/

[moyd]

Sure, buying new is the smart thing to do. But this is for fun

No schematics makes it a bit of a guessing game, but I've ordered new capacitors for the entire board and will also try to replace an ADC chip that I suspect is doing the voltage measurements.