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Astatic 575M-6 mic wiring question?
- Thread starter long night
- Start date
Hi Loose Cannon. I was able to resolder the positive battery lead after cleaning the old connection that was pulled out. I used a solder sucker to get the old solder and wire out of the hole. I got continuity and resoldered the positive lead. I did not have the same luck with the negative lead. After cleaning and solder sucking that hole I can not get continuity. The trace must have been damaged when the negative wire got pulled out and the trace is extremely small. Is there another place I can attach the negative lead to on the board?
Thank you for your help with this.
it gets connected to pin 9 of the mic switch. (look at the diagram in my post on the first page of this thread)
that post should also help you determine which pin is pin 9.
LC
that post should also help you determine which pin is pin 9.
LC
I found no continuity from pin 9 from front to back of board for the negative. No sign of solder pads either. I think the trace to the pads may have pulled out. So very small! How can I repair the trace? Did get continuity on positive so I reattached red wire. Just need to deal with negative.
Thanks
the trace probably did lift off the board.
they are cheaply made PC boards and won't tolerate being heated much.
just solder the negative lead right to pin 9's solder connection.
the 5K adjustment pot is your gain control on the mic.
LC
they are cheaply made PC boards and won't tolerate being heated much.
just solder the negative lead right to pin 9's solder connection.
the 5K adjustment pot is your gain control on the mic.
LC
Hi loosecannon. Bare with me here. Solder the battery negative lead wire to pin 9 on the back side of the PC board? The 5K adjustment pot you refer to. I do not recognize it. Does it have a screw type adjustment like many pots do? Just trying to learn here about this mic.
Thanks
Also is pin 9 the negative solder point on the front side of the battery wire connection as well as the back side? Is it the same spot on both sides of the PC board?
loosecannon. Just to try and clarify this. I should solder the new battery connector to the back side of the PC board on the same pins that correspond to the front side. Positive wire to pin 8 and negative wire to pin 9 at their respective solder connections? Thanks
Apologies for the misleading info.
I had forgotten that this was a 575 and was thinking about the D104M6 that has a little round volume pot in it.
your mic has a volume and tone control, but they are sliding faders, not round potentiometers. they do the same thing, just shaped differently.
I also only gave you part of the schematic in that post on page 1, as we were only dealing with the PTT switch itself at that point.
here is the full schematic of the 575M6 mic:
see that arrow towards the left side of the diagram that is pointing at that jagged line labeled "2M"?
that is the schematic symbol for a 2 Meg ohm variable resistor AKA potentiometer or "pot". many pots are round like you would see on the face of your radio, but some are sliders like you'd see on a mixing console.
your mic has the slider type.
the 2 meg ohm "pot" is for your tone control.
now if you look to the right a bit, you'll see another one of those arrows pointing at a jagged line, this one labeled "5K".
this is your volume control slider and it is a 5 Kilo ohm potentiometer.
the positive lead of the battery is connected to one of the terminals of the volume control slider.
sounds like you already have that one done correctly so just leave that one alone.
we are going to need to turn the PC board over now so you can access the solder connections of the PTT (push to talk) switch.
after determining which of those solder connections is pin 9, using my post from page 1 to figure out which pin is which, you will solder the negative lead of the battery connector right to that solder connection.
you may have to add a little length of wire on to that negative wire in order to reach around the PC board, and you might need to route it around a bit in order to get everything to seat back into place.
if you need to, you can take a picture of the other side of the PC board where the switch solder connections are, and i can help you determine which one is pin 9.
hope this helps.
LC
I had forgotten that this was a 575 and was thinking about the D104M6 that has a little round volume pot in it.
your mic has a volume and tone control, but they are sliding faders, not round potentiometers. they do the same thing, just shaped differently.
I also only gave you part of the schematic in that post on page 1, as we were only dealing with the PTT switch itself at that point.
here is the full schematic of the 575M6 mic:
see that arrow towards the left side of the diagram that is pointing at that jagged line labeled "2M"?
that is the schematic symbol for a 2 Meg ohm variable resistor AKA potentiometer or "pot". many pots are round like you would see on the face of your radio, but some are sliders like you'd see on a mixing console.
your mic has the slider type.
the 2 meg ohm "pot" is for your tone control.
now if you look to the right a bit, you'll see another one of those arrows pointing at a jagged line, this one labeled "5K".
this is your volume control slider and it is a 5 Kilo ohm potentiometer.
the positive lead of the battery is connected to one of the terminals of the volume control slider.
sounds like you already have that one done correctly so just leave that one alone.
we are going to need to turn the PC board over now so you can access the solder connections of the PTT (push to talk) switch.
after determining which of those solder connections is pin 9, using my post from page 1 to figure out which pin is which, you will solder the negative lead of the battery connector right to that solder connection.
you may have to add a little length of wire on to that negative wire in order to reach around the PC board, and you might need to route it around a bit in order to get everything to seat back into place.
if you need to, you can take a picture of the other side of the PC board where the switch solder connections are, and i can help you determine which one is pin 9.
hope this helps.
LC
Thank you for the great information. It is very helpful to a novice like myself. I will put a new battery connector on so I have more wire to get to the front of the PC board. When I get it soldered I will let you know how I make out.
Thank you so very much for your help and patience.