Maxcom 30e random frequency
-
- Super Member
- Posts: 347
- Joined: 09 Mar 2021, 12:10
- Call Sign: 26TM773
Maxcom 30e random frequency
Need advice (2nd opinion) please.
Maxcom 30e works fine and on frequency on all channels when cold, but, when warm, a few random channels are fixed on channel 24.
Still TX and RX OK but channel 1, for example is channel 24.
Nothing feels hot and no caps look distressed but that's as far as the investigations have gone so far.....
So any ideas or help please?
Maxcom 30e works fine and on frequency on all channels when cold, but, when warm, a few random channels are fixed on channel 24.
Still TX and RX OK but channel 1, for example is channel 24.
Nothing feels hot and no caps look distressed but that's as far as the investigations have gone so far.....
So any ideas or help please?
-
- Legend
- Posts: 8666
- Joined: 23 Jan 2010, 19:26
- Location: Bristol-ish
Re: Maxcom 30e random frequency
This is well above my level of expertise, so all I can think of is a solder joint on the board or on a component may be opening up near the channel selector stuff as it expands as it warms up??? Perhaps just remelt all the solder joints you can to try and rule them out.
If it's a crack in the tracks etc then that may be harder to find with a soldering iron and definitely beyond me
If it's a crack in the tracks etc then that may be harder to find with a soldering iron and definitely beyond me
- CaptainKirk
- Radio Addict
- Posts: 758
- Joined: 04 May 2007, 23:01
- Call Sign: KIRKY
- Location: Crewe England
Re: Maxcom 30e random frequency
Is it an original Maxcom 30E or the MX30 stickered Danita 640 which is a converted CEPT radio?
CAPTAIN KIRK-26TM013/26CT013/26UK013 John mobile South Cheshire.
- Otter
- Veteran
- Posts: 3369
- Joined: 04 Apr 2008, 21:42
- Call Sign: 26TM439
Re: Maxcom 30e random frequency
If there are no mods I would think it's the PLL going faulty. I don't know the radio though. The schematic I have shows an LC7136/7137 PLL and if that's your radio it reall can only be the PLL or (nuch) less likely the channel switch.
"To this day the words Stirling bridge conjour pride in every Scotsman's heart, while to an Englishman those same words conjour literally no feelings at all." - Cunk on Britain S1 E1
- 14CS06
- Top Poster
- Posts: 1796
- Joined: 04 Mar 2012, 09:15
- Location: JN33LN - ALPES-MARITIMES-06 France
Re: Maxcom 30e random frequency
Hello
Is this
@+
Claude
Is this
@+
Claude
You do not have the required permissions to view the files attached to this post.
Photo Collector CB RADIO
-
- Super Member
- Posts: 347
- Joined: 09 Mar 2021, 12:10
- Call Sign: 26TM773
Re: Maxcom 30e random frequency
Hi guys, yes it's the 30e exactly as Claude has posted.
My suspicions were around a blown data line in the PLL to Otter.
I guess I need to swap it out although there's no evidence of foul play to bugger it up.
My suspicions were around a blown data line in the PLL to Otter.
I guess I need to swap it out although there's no evidence of foul play to bugger it up.
-
- Super Member
- Posts: 347
- Joined: 09 Mar 2021, 12:10
- Call Sign: 26TM773
- CaptainKirk
- Radio Addict
- Posts: 758
- Joined: 04 May 2007, 23:01
- Call Sign: KIRKY
- Location: Crewe England
Re: Maxcom 30e random frequency
Nice one
CAPTAIN KIRK-26TM013/26CT013/26UK013 John mobile South Cheshire.
-
- Legend
- Posts: 8666
- Joined: 23 Jan 2010, 19:26
- Location: Bristol-ish
Re: Maxcom 30e random frequency
Well done that man. Another radio saved from the scrap heap
-
- Super Member
- Posts: 347
- Joined: 09 Mar 2021, 12:10
- Call Sign: 26TM773
Re: Maxcom 30e random frequency
I'd never scrap anything with a pulseThe Collector wrote: ↑25 Feb 2022, 19:45 Well done that man. Another radio saved from the scrap heap
-
- Legend
- Posts: 8666
- Joined: 23 Jan 2010, 19:26
- Location: Bristol-ish
Re: Maxcom 30e random frequency
I've got this Fidelity 1000 that needs looking at....ChubbyChops wrote: ↑26 Feb 2022, 13:44I'd never scrap anything with a pulseThe Collector wrote: ↑25 Feb 2022, 19:45 Well done that man. Another radio saved from the scrap heap
-
- Super Member
- Posts: 347
- Joined: 09 Mar 2021, 12:10
- Call Sign: 26TM773
Re: Maxcom 30e random frequency
I've just revived one of those today.
Had no TX due to a burned out resistor in the output stage.
Had no TX due to a burned out resistor in the output stage.