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KT8360HUK
- Thread starter wcf8144
- Start date
Ohm meter. Honestly just get a new one. Kmc65 or 66(dtmf)
Thank you for the suggestion and the diagram. I don't understand why I can both read and write to the radio and the software transmit test works plugged into the same port as the microphone, yet the radio will not transmit with microphone connected.
Just seems weird to me.
Just seems weird to me.
mmckenna
I ♥ Ø
The alignment function is in the software, it doesn't use the PTT lead on the mic jack.
Is this a "new to you" radio, or one that you've had for a long time that suddenly stopped working?
mmckenna
I ♥ Ø
I would take a close look at the "extended function" settings.
For data use, the mic input and ptt can be rerouted to the rear connector via software on the TK-x180 and NX-x00 series. Pretty sure that's an option with these radios.
For data use, the mic input and ptt can be rerouted to the rear connector via software on the TK-x180 and NX-x00 series. Pretty sure that's an option with these radios.
fire_master_21
Member
If used, then it might be worth a trip in for service and parts replacement. You don't know the history behind it or how it was treated. I have had many mic jacks filled with energy drinks, soda, and coffee. EMS crews are the worst when it comes to spilling liquids in the cabs of the trucks, and of course it was always the "other crew's" who spilled the drinks.
Your switched battery connection on the mic jack is bad. The KMC-35 requires power to PTT. a more basic KMC-30 just switches the PTT to the ground. The circuit on the KMC-35 is more complex and uses a transistor that is "powered" by the 12V SB lead to connect the PTT to ground. If you did get it to transmit by using a cheaper mic, the microphone part won't work because it also needs the bias (power) from the radio.
The radio reads and writes with the PTT and HOOK pins so that's why you can read and write. It was pretty common ok the non display TK-8302 to have no mic audio. you can check for 12V on the back of the front PCB. I'll bet it's not there. what I did was replace the front board or run little jumper from were is on the front. I think your SB is making it to the front, because your display backlight runs off of it too, just needs to make it to the mic.
hope this helps.
The radio reads and writes with the PTT and HOOK pins so that's why you can read and write. It was pretty common ok the non display TK-8302 to have no mic audio. you can check for 12V on the back of the front PCB. I'll bet it's not there. what I did was replace the front board or run little jumper from were is on the front. I think your SB is making it to the front, because your display backlight runs off of it too, just needs to make it to the mic.
hope this helps.
Thanks to all for the great suggestions. I finally found the time to go into the radio and low and behold there has been some type of liquid spill on the mike jack side of the display unit. Tried cleaning it up and reheated solder joints to no avail. Tested for continuity front to back on mic jack and that checked out. Must not be getting the 12 volts needed for mic. Not sure if it's worth pursuing any farther considering the age and cost of repairs. Recommendations?
mmckenna
I ♥ Ø
Are you sure it wasn't solder flux?
The 12 volts that feeds the mic comes through the connection from the rf deck. It feeds a number of other things on the control head, so I doubt the 12 volt feed is bad.
Did you check the "Extended Function" settings like I suggested above?
Only other thing that is an easy check would be the ribbon cable from the control head to the RF deck. Make sure it is fully seated.
Screen shot of extended function.
Checked ribbon cable closely when I reinstalled.
There were signs of liquid on the inside of the plastic front cover as well.
At a loss for ideas now.
mmckenna
I ♥ Ø
OK, I was on the wrong track with the extended function thing.
Have you tried a brand new microphone to rule that out?
Other than that, there's not much else you can do without getting into component level repair stuff here, and that's getting way too in depth for a hobby radio site.
Have you tried a brand new microphone to rule that out?
Other than that, there's not much else you can do without getting into component level repair stuff here, and that's getting way too in depth for a hobby radio site.
Have KMC-35 and KMC-65 and radio won't xmit with either one. These are not new mics but I don't believe I have two bad mics. Luckily I don't have much more than my time invested.
Thanks for your help!
mmckenna
I ♥ Ø
Yeah, sounds like an issue with the control head. For a radio that old, it is probably not worth paying to get it fixed. Just get a new one. These modern radios with surface mount components are not serviceable by most. Even shops will just swap out the board.
I don't know how a KMC-65 works inside to say how the PTT works on it, but you said the 12v was missing. It will need that to do the MIC audio.
Usually the trace in the front board is open. Looking at the big connector the 2nd from the mic jack side is the SB line. It runs to via. Nearly every time that via has the SB still. I just ran a little wire from the via to the Resistor near the jack. The Service manual is online so you can follow it along. It's an easy fix IMO. It's a very good manual. Kenwood manuals used to be the best for board views. The pins of the mic jack and the connector are labeled.
That via takes solder no problem too.
Up to you if you want to fix it, but if that 12v is making it to the front board and you've removed the water damage. I'd go for it. You'll get the sweet satisfaction of making a broken thing work.
edit: if you don't have a power supply out of the vehicle you can use the manual and an Ohmmeter instead. That's probably a better idea. Just see if the SB line to the SB on the mic is ok. If its not then jumper it.
Usually the trace in the front board is open. Looking at the big connector the 2nd from the mic jack side is the SB line. It runs to via. Nearly every time that via has the SB still. I just ran a little wire from the via to the Resistor near the jack. The Service manual is online so you can follow it along. It's an easy fix IMO. It's a very good manual. Kenwood manuals used to be the best for board views. The pins of the mic jack and the connector are labeled.
That via takes solder no problem too.
Up to you if you want to fix it, but if that 12v is making it to the front board and you've removed the water damage. I'd go for it. You'll get the sweet satisfaction of making a broken thing work.
edit: if you don't have a power supply out of the vehicle you can use the manual and an Ohmmeter instead. That's probably a better idea. Just see if the SB line to the SB on the mic is ok. If its not then jumper it.
Thank you for your reply. I would like nothing better than to make this thing work but I'm not familiar with some of the nomenclature you referred to in your post. I have limited experience with these radios. Not clear on what "SB" and "via" refer to.
The service manual I have does not show the "front" display board separately. Thanks again for the information.
mmckenna
I ♥ Ø
SB is "Switched battery" essentially 12 volts switched by the radio power switch.
He was talking about bypassing some of the circuit traces to see if you can get the radio to work. It's possible, but working inside these radios can be difficult if you haven't done it before.
These are older radios, probably easier to just fine a new one and keep this one for spare parts.
He was talking about bypassing some of the circuit traces to see if you can get the radio to work. It's possible, but working inside these radios can be difficult if you haven't done it before.
These are older radios, probably easier to just fine a new one and keep this one for spare parts.
I just fixed two (a TK-880 and a TK-863G) with exactly this problem. The trace in one of the innner board layers acts as a fuse when someone manages to short the SB (pin 2) on the mic connector to ground. The answer is to replace the B/O trace with a wire or, as others said, find a cheap replacement radio. It's a tough decision with labor around $100 and used radio around $200 (+/- $100). If you get a used radio from a reputable source, though, you then have almost a complete second radio's worth of parts when you need them. Make sure you take programming into account if you get another radio.
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