I shorted out Excalibur board any one know how to repair????

[Bert,Miami]

Hi I am a novice at technical things, and it has been suggested more than once that I not touch the things because I eventually break them.

but this is the second excalibur I have owned and I have opened and sucessfully reconnected the coil wire and fixed the battery wire and identified shorts in the cable and have installed the "water proof" connectors and have had to re-do the connections several times.
due to water leakage. so I have been able to so some things with out sending it for repair.

but I
recently open the case and had the board on the table with the headphones connected and on my head , as I turned my head, the board moved and my pliers contacted the bottom of the board and then it didn't work any more.

I purchased some of the capacitors that are near the coil connection and are accessable to be taken off thinking that it couldn't hurt to try some inexpensive things to try to get it runnign again so I got them and reinsatlled them,
there was no improvement. infact there is no response at all,

even with the short it would give a clicking or pop when I turned it on and off
but now is just silent.

I tested the voltage at the battery wires going into the board and it would get the same voltage when turned on as it would when turned off ( about 12 volts)

now after the new capicitors, it gets 12 volts before I turn it on, and it gets only 1 to 1.5 volts when I turn it on and there is no sound at all

Minelab quoted $350 for new board, but this is at least 6 years old and I would like to find a good used board or find some one who can diagnose and repair this one.

if you can find a used motor for a car, why can't you find a used "motor" for this thing?

any one have expereince (more successfull than mine) on repairing Excal boards #3069

photo shows the new cpacitors after intallation, I purchased them from mouser and odered the same specifications as the old ones ,

repalced resistor next to battery cables (15404)
and put the white stripe on resistor the same direction as the white stripe on board

the two on top are c5 and c5A on board replaced
two 470 uF 16v with 105 degree temp

but the two on the bottom board said H8 and H9 from sanwa and corresponed with a c38 and c39 on the board , the specifications are the same, but I could not order from the sanwa web page because it is in Korean so I couldnt' get the info on if there are any differences between the H8 and H9 capacitors

does the H8 and H9 have any differences if the spceifications are the same?? 1000uF 16 v


thank you for any help or suggestions
Bert

[FJ]

Re: I shorted out Excalibur board any one know how to repair????

As for the capacitors, it is unlikely that they are the problem. But since you replaced them and now the unit is behaving differently, it is probably likely that you installed one or more in backwards. For example, look at the 1000uF in the picture. The visible side is the negative side. Make sure you have them installed correctly, if not, reverse it. Resistors are not polarity sensitive so that is not an issue.

My guess would be that you have something more than a capacitor or resistor that has been blown.
Good luck,
FJ

[Bert,Miami]

Re: thank you for info FJ

I will check again

the stripe on the side is negative right?

so I put in with the sripe on side corresponding to the negative on the board.

but since I was getting a 12c volt reading and now I am getting only 1 volt I have to assume I did something wrong.

thanks for help

[philippehobby]

Please specify the points (which board, which points) you shorted.
I will try to help,
Regards,
Philippe

[Carl-NC]

Eh, this was 11 years ago.

[kt315]

yes, Philippe, schematic and board will be greatly meeted. despite on age never late it go.

[technos]

My kind of people! Responding to a ten year old post!