Thx for the reply homefire, I am only getting to my work computer now and wish that I could have replied last night. The 505 does not work on all metal. I never use it and I decided to check it out one day to only find it not working a few months ago.
There are a couple of things that I will be doing with it next. First, I will have to brush up on the user guide to see if there is any settings that might be inhibiting me here. Perhaps water damage could have screwed up the panel push buttons. I have not been pampering the detector like I should have been and it is starting to look ragged. Although I have gotten more than a few hundred hours of use out of it in a relatively short time., it still looks a little more beat up than it should at this point.
After work yesterday I mocked my MPX up on my home bench and monitored both coil pairs with a scope meter. This essentially told me that the MPX uses a form of modulated signal that could be compared to the receive coil in many ways. The pioneer did not have the same level of signal that the MPX does even though it was sending it's tx coil twice the voltage that the mpx was. The MPX's receive pair looked much different as well.
I don't think that it will be too helpful for me to try to get into the details of what I was thinking because I can see me changing my opinion a few times after I learn more about what I was looking at. As of now, I am lacking in theory and what not. Hopefully I can get into things well enough to undo any misalignments that I may have caused with the pots.
I am hoping to find something with the front panel. If it is just stuck in some mode or another then I feel my chances are pretty good for success. If this is something more difficult then I can see myself learning a lot from working with it at home on my spare time. I doubt that I will give up for a very long time. This is al very interesting to me even though it is aggravating to lose my favorite unit. Maybe I will get lucky and everything will work out. I don't have any misconceptions about my odds of success here. I can see myself using my MPX until I can get a better detector. I wanted an upgrade anyway, maybe this will get the ball rolling on that a little sooner?
Maybe someone will have a tip or two about the 505 that will help? I am all ears and optimism.
Posted on: August 11, 2011, 09:24:22 AM
 |  | Quote: |  | | Posted by homefire | | |  |
| Don't monkey with the pots!
Try some fresh alki Batteries.
Mine does that when the batteries are low.
Forget the Depth reading. Never were right.
How does it work in all metal or Pin Point?
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Also, you have reminded me about some regulators that I acquired to replace the batteries. Since this problem has been going on thru a few sets of batteries, I don't think that it would help but perhaps I can look into the unit's power supply to see if it seems to be working properly. The unit takes two 9V batts that are connected in series. I will have to map out the board a little better to further understand how it uses the power source though. I have two ten volt regulators that I might wire up in series so that I will be able to use a better power source that I will not have to worry about replacing so often.
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Tri City Ditty
