Basically, I connected +5VDC to the ground of a GPS receiver, and now have no power from the power source.
Is it possible to mess something up by doing this?
I feel like this is more of a basic electronics question, but it is specific to this radio.
Here's the full backstory:
On the back the Yaesu FT-2600M, there's a DSUB9 port for packet radio data. One nice thing they include in those pins is +5VDC for an accessory.
Pin 8 is +5 VDC switched and regulated with a max current of 50mA according to the manual.
Pin 5 is Ground.
I was trying to supply power to a GPS receiver using this 5 volt output.
I'm using a DB9 to terminal block connector for this as well as interfacing with a TNC, so the housing for the connector would have 2 cables coming out of it - one to the TNC for PTT, audio I/O, the other carrying GPS power.
The GPS receiver power inlet is a 6 pin mini DIN. Mini DIN pinout:
Pin 2 - ground
pin 5 - +5VDC
(GPS data goes through a separate DSUB9.)
I checked the voltage on pin 8 of the Yaesu, and it was 8 volts. No problem, right? At least it wasn't low.
So I soldered a 2 conductor cable to what I thought were the proper pins on a female mini DIN, then connected the other end to the DB9 terminal block at the radio.
No power to the GPS. Weird, I thought.
I put the meter on the terminal block again to see if it was still reading 8V.
To troubleshoot, I took the ends of the female mini DIN out of the terminal block, put a USB-A on the end, and it and stuck it in my computer.
Still no power to the GPS, but I was reading 5VDC at the connection, so the only other explanation was that I got the +5 and ground backwards at the mini DIN.
This is the kind where the housing is a one-shot deal so I had to destroy the housing/boot part to take it apart.
I did wire it backwards.
Pin 8 from the Yaesu was going to Pin 2 of the mini DIN when it should have gone to Pin 5.
Could I have possibly blown a tiny fuse or ruined some other part in the radio somewhere by hooking this up to the load backwards?
I don't see anything in the manual about a setting within the radio that would turn this power on or off.