Major M588

For discussions on CB Radio Repair and Troubleshooting, do not post modification requests here, use the Modifications forum !
Post Reply
M6MRP
Newbie
Newbie
Posts: 5
Joined: Thursday 11th Dec 2014, 5:12
First Name: Phil
Location: UK

Major M588

Post by 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)

Post by 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

Post Reply

Return to “CB Radio Repair and Troubleshooting”