Anyone have G-LOC Deluxe Motor Driver repair knowledge?

modessitt

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Anyone have G-LOC Deluxe Motor Driver repair knowledge?

I'm trying to fix one that doesn't move. Looking at the two driver boards, the LED on the "Left" one lights, but the LED on the "Right" one does not. I have swapped the two and the LED lights on the "Left" one in either spot, but the LED does not light on the "Right" one in either spot. I'm taking that to assume the issue is actually with the driver board and not with the wiring to it or the pre-board before it.

Now, I have tried comparing reading on all the transistors and diodes between the two and don't see an issue. The fuse is good and the fan runs on power up. Without a schematic, it's a headache trying to figure out what's supposed to be going on. The operating and service manual has some minor troubleshooting info, but nothing really relevant, and my searching hasn't come up with anything but unanswered similar questions.

Now, I also don't know what affect the side safety optic sensors have when it comes to testing. I have the covers off the cab, so they're not lined up, but I'd assume that the LED would still light even if the software doesn't allow the motor to run - especially considering that one does light.

I'd appreciate any advice you can give me....
 
some photos would be better :D

i don't really remember what the driver board looks like, but i ever repaired them long time ago.

from what you described, it looks like safety sensor problem. you said, if led is light, then the motors run, right? then if one of the sensor in problem, the main board won't give any run signal to them.
 
some photos would be better :D

i don't really remember what the driver board looks like, but i ever repaired them long time ago.

from what you described, it looks like safety sensor problem. you said, if led is light, then the motors run, right? then if one of the sensor in problem, the main board won't give any run signal to them.

These are the power supply driver boards for each motor. The LED should light when plugged in, regardless of whether the motor is being told to run or not. One lights and one does not. Swapping the left board (LED lights) to the right board location stills lights the LED on that board, so the sensors or game program have no bearing on this problem yet. If it was a sensor issue for the right board, then the left board wouldn't work when connected as the right board. Both boards are exactly the same.

I've been doing some readings between the two. I have a few discrepancies - one on the bridge rectifier when installed and one on the LED installed. Just for grins I swapped them between the two boards, but there was no change in the functionality of both, and the "bad" board gave the same different readings on the two parts with the parts from the "good" board, while the good board gave the same "good?" readings with the parts from the bad board.

It sucks not having a schematic for this actual board. The boards are the two in the bottom right of this picture:

G-locelectricalparts.jpg
 
are there many fet's under that big square heatsink?

you can trace out the LED connection. is it from the PSU or from controller status or else.
 
are there many fet's under that big square heatsink?

you can trace out the LED connection. is it from the PSU or from controller status or else.

There are a lot of FETs (mounted on the other side, you can see the legs of them running through the middle of the board in the second pic), but I compared the readings between the two and they are spot on.

I've been trying to trace out the LED connection, but with top side and bottom side traces, some of which run under chips and caps, it's hard to trace out. The LED is confirmed good, so it's not burnt out. I can't tell if the LED is just a light that says the voltage is on, or what. Considering that the left board light with both the left and right connectors, it stands to reason that this one should light also. Without a schematic I can't tell what voltages should be where, what parts may be in parallel or series that could affect it, etc.

Plus, the design of the cabinet really inhibits my ability to do voltage checks while installed...
 
is that small led in the left bottom you mean?

is looks like connected to the socket in the left corner (just a guess). it not so hard to trace out the connection. just pull the board from the cab, you don't need it to be in 'live' to trace connection.

btw, if your board are like in that photo, you really should clean them up.
 
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