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7070 Issues

H

h4ck.b0x7

Member
I have a 7070 that doesn't power up. When I hit the power button nothing happens. I plugged another radio into the unswitched jack on the back and it powers up no problem, however, when plugged into the switched jack it does not power up. Any ideas?
 
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Bad power switch. It's a double pole switch and one side isn't used. You can simply swap the wires to the unused side and you should be good to go. It's a good idea to replace the ceramic capacitor on the switch too.

- Pete
 
Fuses?

Inside and out.

IF you find a bad fuse and replace it with the CORRECT one and it blows, stop, she's broken and needs repair.
 
Thanks Pete!! I was thinking it was a bad power switch. Am I correct in thinking that the fuses should make no difference at that point in the circuit? Bad fuses wouldn't cause the switched jack to not work, correct?
 
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What is the best way to drain the caps in these so I can mess with the safely mess with the power switch? I'd rather not wait hours for them to drain on their own. What's the best way to go about testing to make sure it IS the switch and not something else? Is there an easy way to bypass the switch? Also, if it turns out to be the switch itself is the power switch in the 5050 the same as the 7070? I have a 5050 lying around that I could snag the power switch out of.
 
h4ck.b0x7 said:
What is the best way to drain the caps in these so I can mess with the safely mess with the power switch? I'd rather not wait hours for them to drain on their own. What's the best way to go about testing to make sure it IS the switch and not something else? Is there an easy way to bypass the switch? Also, if it turns out to be the switch itself is the power switch in the 5050 the same as the 7070? I have a 5050 lying around that I could snag the power switch out of.
Click to expand...

Looking at the schematic, turn your switch on. If you have power on the switched outlet on the back, your switch is OK, and your fuse is blown.

If you have no power on the switched outlet, your switch is bad. Then do as LBPete said, get in there and switch over to the other set of contacts and change out the bypass capacitor.

In regards to draining the caps, just put a meter across the terminals and see if there is any voltage on them.

Last, be careful.

Have fun, hope this helps.

George.
 
Since I didn't get any replies earlier and I didn't want to tear the whole thing apart to change the switch connections not knowing the best access point and if it would work or not, I went another route.

I looked at the schematic and used a small piece of wire to jump the two points from the unswitched jack to the switched jack. It just bypasses the switch altogether. I plugged it into a surge protector that has a switch to turn it on and off. It's a temporary fix for now.

I'm still curious as to the best way to get to the switch to move the connections, any ideas?
 
h4ck.b0x7 said:
Since I didn't get any replies earlier and I didn't want to tear the whole thing apart to change the switch connections not knowing the best access point and if it would work or not, I went another route.

I looked at the schematic and used a small piece of wire to jump the two points from the unswitched jack to the switched jack. It just bypasses the switch altogether. I plugged it into a surge protector that has a switch to turn it on and off. It's a temporary fix for now.

I'm still curious as to the best way to get to the switch to move the connections, any ideas?
Click to expand...

Disassembly required. Remove all front panel knobs. There are two large brass nuts that hold the front bezel in place as well as a half dozen small screws on top and bottom of front panel. Probably a small strip of wooden trim under the front bezel needs to be removed to gain access to the lower bezel screws. Take your time , organize the fasteners and bits removed. Take notes or photos to aid in the reassembly process.
 
Once the front panel is removed.It will be easier to see how to best loosen or remove assemblies for a good cleaning as well as access to the power switch.

Now you know why it costs so much for repair work. Its very time consuming and attention to detail.
 
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