Major M588

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M6MRP
Newbie
Newbie
Posts: 5
Joined: Thursday 11th Dec 2014, 5:12
First Name: Phil
Location: UK

Major M588

Postby M6MRP » Thursday 11th Dec 2014, 5:41

Radio Make and Model:
PCB Number:
PLL Number:
Test gear available:
Symptoms:

What is working:

What has been tried:

Did it suddenly happen ?:
Anything else that may be of help?:

M6MRP
Newbie
Newbie
Posts: 5
Joined: Thursday 11th Dec 2014, 5:12
First Name: Phil
Location: UK

Re: Major M588 (found the problem)

Postby M6MRP » Wednesday 17th Dec 2014, 23:09

Problem sorted guys :D , checked all relevant resistors all ok, then started checking relevant caps and found a dead ceramic! C22 .047uf (first dead one Ive ever seen?) and replaced that with a decent high Q mylar version from my electric guitar tone junkie parts then found C24 listed as 39pf had been replaced with a 27pf so swapped that out with trimmer cap to test and swung it on TX, the TX frequency easily swung from the old UK 27/81 FM -3.7kHz off-set back to the proper 5.0kHz ending, C22 and C24 are part of the fixed bias parallel feed for the clarifier from Q4 for anybody who is interested.
73
Phil


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