Hey all, So my MK1 Lincoln has gone loopy. It was working fine until one day I noticed the band seemed quieter than normal so I checked the Lincoln out and found it's now TX and RX'ing about 1MHZ out. If it's showing 27.555 it's actually on 28.7something. Any ideas?
Cheers all...Rich
Lincoln gone nuts
- NightProwler
- Veteran
- Posts: 3414
- Joined: 08 Feb 2012, 22:31
- Call Sign: 163TM186
- Location: South Wales
Lincoln gone nuts
Shorter of breath and one day closer to death
- 13EL121
- Radio Addict
- Posts: 618
- Joined: 16 Sep 2008, 20:55
- Call Sign: 13DA121
- Location: Germany
- Contact:
Re: Lincoln gone nuts
I would start with checking the PLL board, all frequencies and voltages to measure can be found in the service manual. Maybe there is a fault in the PLL area. Depending on production year, the electrolytic caps start to leak or dry out after all the years.
- Otter
- Veteran
- Posts: 3365
- Joined: 04 Apr 2008, 21:42
- Call Sign: 26TM439
Re: Lincoln gone nuts
Does the TX / Rx frequency change as you adjust the displayed frequency? If so, is the offset always the same? (Try 26.25, 26.75, 27.25, 27.75, 28.25, 28.75, 29.25, 29.6 MHz).
What is the part number on the CPU?
If the radio transmits, the low frequency PLL should be locked. I would guess that either the high frequency loop isn't working properly, the PLL0305A chip is broken, a reference frequency is broken or the CPU has gone faulty.
What is the part number on the CPU?
If the radio transmits, the low frequency PLL should be locked. I would guess that either the high frequency loop isn't working properly, the PLL0305A chip is broken, a reference frequency is broken or the CPU has gone faulty.
"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
- NightProwler
- Veteran
- Posts: 3414
- Joined: 08 Feb 2012, 22:31
- Call Sign: 163TM186
- Location: South Wales
Re: Lincoln gone nuts
Cheers guys. I'm in work at the moment but when I have time I will look at what PLL is in it. I have a box of scrap Lincoln parts here so I could swap the PLL over. I'm in no rush as I have a another I use. Cheers...Rich
Shorter of breath and one day closer to death
- NightProwler
- Veteran
- Posts: 3414
- Joined: 08 Feb 2012, 22:31
- Call Sign: 163TM186
- Location: South Wales
Re: Lincoln gone nuts
Well I finally got the old Lincoln going again, I had a spare PLL board lying about so I swapped them over and it's alive again. Now I just have another thousand radios that need looking at.
Shorter of breath and one day closer to death
- 13EL121
- Radio Addict
- Posts: 618
- Joined: 16 Sep 2008, 20:55
- Call Sign: 13DA121
- Location: Germany
- Contact: