Orion MBR not charging

[manina]

My Orion MBR is no longer charging the secondary battery. When it's powered, only the red light turno on (indicating it's ON) but no green light (indicating it's charging).

I tested it with a fixed voltage supply (13.6V) and does not work. At a visula inspection, nothing is burn.

What should I check?

Thanks

[AKHeathen]

pics? i take it's not solid state?

[manina]

Here it's the MBR. I removed the 2n6488 on the bottom right hoping they are the problem.

Before removing them, I measured the two TL494 voltage - supply was 13,54V
Bottom right TL494
Pin 1 - 0,006V
Pin 2 - 0,07V
Pin 3 - 0,07V
Pin 4 - 0,02V
Pin 5 - 1,52V
Pin 6 - 3,36
Pin 7 - 0,006V
Pin 8 - 4,08V
Pin 9 - 1,51V
Pin 10 - 1,19V
Pin 11 - 4,05V
Pin 12 - 12,84V
Pin 13 - 5,08
Pin 14 - 5,08
Pin 15 - 0,07V
Pin 16 - 0,006V

Upper right TL494
Pin 1 - 0,006V
Pin 2 - 4,79V
Pin 3 - 4,79V
Pin 4 - 0,01V
Pin 5 - 1,55V
Pin 6 - 3,51V
Pin 7 - 0,006V
Pin 8 - 30,22V
Pin 9 - 0,34V
Pin 10 - 0,34V
Pin 11 - 30,24V
Pin 12 - 30,25V
Pin 13 - 0,06
Pin 14 - 5,04
Pin 15 - 4,79V
Pin 16 - 9,14V

[1moreamp]

Here is a link to its schematic . its a mosfet based device.

http://www.compendiumarcana.com/foru...OrionMBR70.pdf

[1moreamp]

Better yet here it is attached

[Perry Babin]

It appears that it needs to have a battery connected to its output to have any output.

If you connect B+ to the input and short the collector and emitter of Q6, that should force it to produce output.

[manina]

Thanks for the schematics and the hints. As soon as I get the 2n6488 to replace the ones taken out, I'll do some more tests.

[manina]

I had finally time to re-assemble the MBR and test it with a battery. It does not work

The green led turn on but there is no output voltage.

The source is a fixed voltage supply running at 13,7V so definitely enough to turn it on.

I can only think the second TL494 (right side of the PDF) has problems as the first one is properly driving the 30V (actually, 30,01V)

I also checked the resistors (all) and all are as per the schematic - nothing burned.

Any suggestion?

[Perry Babin]

Post the DC voltage on all pine of Q5 and Q6 with the MBR connected as it would be normally (battery on input and on output).

[manina]

Originally Posted by Perry Babin

Post the DC voltage on all pine of Q5 and Q6 with the MBR connected as it would be normally (battery on input and on output).

Q5 (MPSA56)
1 13,29
2 12,64
3 0,7 3

Q6 (MPSA06)
1 0,04
2 0,73
3 0,05