My 22b is stuck on channel 17 none of the buttons that effect channel change will work and channel selector does not change it either It is transmitting and receiving. The tx sign is also on in corner. This radio looks like a 2950 button type but a base. Any help please.
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Galaxy 22b base stuck on one channel.
- Thread starter Jimbo165
- Start date
If the radio indeed transmits and receives that would suggest the PLL is locking.
But it could be a VCO circuit problem, causing PLL issues..
It could be a bad capacitor, cold/broken solder joint.
It could be a dirty channel select switch, or blown diode somewhere.
The TX indicator light, is that lit on receive?
Have you recently attempted any modifications on this radio?
If this unit uses a microprocessor to create channels you may have a deeper issue yet!
But it could be a VCO circuit problem, causing PLL issues..
It could be a bad capacitor, cold/broken solder joint.
It could be a dirty channel select switch, or blown diode somewhere.
The TX indicator light, is that lit on receive?
Have you recently attempted any modifications on this radio?
If this unit uses a microprocessor to create channels you may have a deeper issue yet!
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It may be as simple as the rotary channel board; but I wouldn't hold my breath. These older 2950 boards can get a fault in the main IC chip - which is not replaceable at any cost. Just not made any more.
I haven't had much luck fixing this kind of board, a little tough to align as well.
Hope it goes your way and can be fixed.
I haven't had much luck fixing this kind of board, a little tough to align as well.
Hope it goes your way and can be fixed.
I have not done any mods to radio and it is stock far as I know. Replaced rotary channel selector a few months back.The TX is lit all the time.
with the tx light on is it keyed up or just the light is on. if it is in TX mode I would check the diodes like D77 at the mic area, plus check for the TX trns stuck on. should be one around tr30 to tr38.; do not have the schematic here but most all radios are with parts in that location. would be nice to have all info as to what the radio is doing with each mode. is it actually rx ing on freq as far as channel 17 as you say it is stuck on. with the TX light on it makes me think it is in TX mode only. do not know since radio is not here. so give all the info you can.
with the type of processor it has it may be a waste of time trying to fix. have seen them get hit by lightening and blow the front end display and parts.
with the type of processor it has it may be a waste of time trying to fix. have seen them get hit by lightening and blow the front end display and parts.
Radio does transmit and receive I unplugged plug in from mic board no change still shows TX in right hand part of screen. I found out that I can get buttons to change screen if I hold that button down and turn power off then on. What I mean is if I want to shift I hold down shift button turn radio on and off and it will shift over one. This works like that on all functions. I believe it has to do will the TX being on all the time but I donot know what to do to correct it.
you said it its on ch17..is it actually tx/rx on ch17 in the real world....... in other words people talking on the real ch 17 can hear you and you can hear them ?
(if not then the vco is out of lock somewhere in the pll system )
the reason i ask this is....
a mistake people make is changing both the high and low band scan limits to the same frequency/channel ..
therefore the radio ends up only being able to be used on that one frequency/channel (the upper and lower scan limits also effect what frequency's the radio will only operate on)
read the manual on frequency scanning part 2.2.1
manual http://www.cbtricks.com/radios/galaxy/dx22b/graphics/dx22b_om.pdf
page 12
you my have to do a reset to put the radio back to stock config easy way to do this is to put it back to 10m only operation via the jumpers ..
then turn radio on..
then turn it back off and put it back into what ever setup you have it in (either 40 only or freeband) on the jumpers..
turn radio back on (turning the radio on after setting the band coverage auto resets the cpu).
details here http://www.cbtricks.com/radios/galaxy/dx22b/dx22b_freq_conv.htm
i see this often when people play with the buttons on the rci radios and some how limit the radios operation down to one frequency..then they think the radio is screwed up...when a simple reset fixes the situation
in rarer cases it is actually a cpu fault but i would attempt the above first before getting ahead of yourself
have yet to not fix one of these rci boarded radios ..most are this problem or dry joints with this symptom
(if not then the vco is out of lock somewhere in the pll system )
the reason i ask this is....
a mistake people make is changing both the high and low band scan limits to the same frequency/channel ..
therefore the radio ends up only being able to be used on that one frequency/channel (the upper and lower scan limits also effect what frequency's the radio will only operate on)
read the manual on frequency scanning part 2.2.1
manual http://www.cbtricks.com/radios/galaxy/dx22b/graphics/dx22b_om.pdf
page 12
you my have to do a reset to put the radio back to stock config easy way to do this is to put it back to 10m only operation via the jumpers ..
then turn radio on..
then turn it back off and put it back into what ever setup you have it in (either 40 only or freeband) on the jumpers..
turn radio back on (turning the radio on after setting the band coverage auto resets the cpu).
details here http://www.cbtricks.com/radios/galaxy/dx22b/dx22b_freq_conv.htm
i see this often when people play with the buttons on the rci radios and some how limit the radios operation down to one frequency..then they think the radio is screwed up...when a simple reset fixes the situation
in rarer cases it is actually a cpu fault but i would attempt the above first before getting ahead of yourself
have yet to not fix one of these rci boarded radios ..most are this problem or dry joints with this symptom
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It will transmit and receive. By turning power on and off and holding down shift button and up down I can change channel slowly. I believe it has something to do with TX light on all the time. I think radio somehow thinks it is in a TX mode and then channel selectors will not work. Could a leaking or bad diode cause this ? I do not know so I'm asking here.
tx/rx switching transistor shorted (locked in tx mode on power up) the small glitch you are creating on power up by holding in that key will be fooling cpu command (cpu looks for tx signal inhibit so it knows to stop scanning if you key the mic) ..
time to look at voltages in the tx/rx switching sections to see which transistor is stuck on state
one of the service manuals for that mother board has the voltage charts
time to look at voltages in the tx/rx switching sections to see which transistor is stuck on state
one of the service manuals for that mother board has the voltage charts
Yeti I think you are on the right idea. that was what I had told him before you even mentioned it but nothing back from him on checking those areas. thinking it is stuck on TX myself. if he does not have the equipment to check the TX area he will need to take it to a shop. not sure what knowledge he has on radio repairs.
Sonoma I have some basic electrical knowledge but not sure enough to repair radio without knowing exactly what to replace. The mic plug area has a small board but no diodes on it just disc capacitors. I am looking for print. Board is marked ept295013z. Yeti Communications I agree with you also. The problem is we do not have any good repair shops close to me and if I ship it plus repair cost could be more than radios worth. It is my everyday radio and hope to find a solution. Will start really looking for transistor problem.. Thanks I really like this forum for all the great help.
Two possibilities only.
1) A short to ground from pin 3 of the mike socket itself, or the tiny pc board behind it.
2) A short to ground INSIDE the CPU on the display board.
Follow the wire from pin 3 on the mike socket to the rear of the CPU/display board. Pull that plug.
If the TX indicator disappears, you have a short to ground on the mike socket.
If the TX indicator is still shown, this means the problem is INSIDE the CPU.
Can't get inside to fix that. And that chip is not available, even if you have the tools to replace a SMT chip with that many pins.
Most of these that I have seen were caused by one of two issues.
First is lightning, usually a strike to a power line near the structure where the radio is located. Had one customer that saw an arc jump from his landline phone to the D-104 on his 2527 when it struck the utility pole on the street. Caused this exact symptom.
Second cause I have seen is hooking up any sort of 12-Volt circuit to pin 3 of the mike socket. A relay to key your external amplifier, a noise toy running from 12 Volts, or any other boo-boo that feeds more than 5 Volts to the mike socket's keying wire.
The mike socket on this radio doesn't key the radio, it keys the computer. A wire coming out of the computer keys the transmit/receive switching circuit on the main pc board.
I have a really old Galaxy Turbo that I bought cheap because of this failure. In that case, someone removed the tiny DIP relay from the amplifier board, and installed a big "ice-cube" size relay from RatShack with long, unshielded wires that ran across the inside of the radio. To key it, one side of the relay's coil hooked to 13.5 Volts, and the other side to pin 3 of the mike socket. The 13.5 Volts feeding through the relay coil on receive zorched the computer's input pin where the mike's keying pin is connected. Showed this exact symptom. Recovered a used CPU board from a mobile radio and changed the connectors to match the base-station's wiring. Been using that radio on the bench for nearly 20 years now. And yes, it's the old one with the backup battery.
Sure makes me wish I had a few thousand bucks spare to design and make a batch of replacements for this family of radios. There are a lot of them out there with a bad CPU and no simple strategy to fix it.
73
1) A short to ground from pin 3 of the mike socket itself, or the tiny pc board behind it.
2) A short to ground INSIDE the CPU on the display board.
Follow the wire from pin 3 on the mike socket to the rear of the CPU/display board. Pull that plug.
If the TX indicator disappears, you have a short to ground on the mike socket.
If the TX indicator is still shown, this means the problem is INSIDE the CPU.
Can't get inside to fix that. And that chip is not available, even if you have the tools to replace a SMT chip with that many pins.
Most of these that I have seen were caused by one of two issues.
First is lightning, usually a strike to a power line near the structure where the radio is located. Had one customer that saw an arc jump from his landline phone to the D-104 on his 2527 when it struck the utility pole on the street. Caused this exact symptom.
Second cause I have seen is hooking up any sort of 12-Volt circuit to pin 3 of the mike socket. A relay to key your external amplifier, a noise toy running from 12 Volts, or any other boo-boo that feeds more than 5 Volts to the mike socket's keying wire.
The mike socket on this radio doesn't key the radio, it keys the computer. A wire coming out of the computer keys the transmit/receive switching circuit on the main pc board.
I have a really old Galaxy Turbo that I bought cheap because of this failure. In that case, someone removed the tiny DIP relay from the amplifier board, and installed a big "ice-cube" size relay from RatShack with long, unshielded wires that ran across the inside of the radio. To key it, one side of the relay's coil hooked to 13.5 Volts, and the other side to pin 3 of the mike socket. The 13.5 Volts feeding through the relay coil on receive zorched the computer's input pin where the mike's keying pin is connected. Showed this exact symptom. Recovered a used CPU board from a mobile radio and changed the connectors to match the base-station's wiring. Been using that radio on the bench for nearly 20 years now. And yes, it's the old one with the backup battery.
Sure makes me wish I had a few thousand bucks spare to design and make a batch of replacements for this family of radios. There are a lot of them out there with a bad CPU and no simple strategy to fix it.
73
Jimbo that is what I was talking about as far as to your knowledge of trouble shooting the radio. just telling you what part to change is going to be hard to do. as Nomad gave you some info as what to look at. so many of this style of radio are setting all over due to parts not available or to hard to change out . seen so many of this type radio biting the dust in a mobile setup because people would want to leave the radio on and hook it to the ignition switch to turn the radio off and on. after a few times the cpu would get knocked out from the power spikes of turning the key on. the front end would not take the sudden power spikes.
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@ BJ radionut:list'n 50.125 USB...working in shop...also 2m FM Simplex freq's 6.52...6.46 ... 6.55 etc..
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