[Heathkit] [Heathkit-Radios] IM-5228 VTVM

[k5jwkgary at gmail.com]

The issue seems to be the AC CAL pot.  When I turn it off and leave it off
for a while and then turn it on, the DC minus pegs to the right and the DC
plus and OHMS peg to the left.  When I lightly bank on the rear of the AC
BALANCE adjustment everything returns to normal.  I have sprayed all the
controls and run them through the rotation cycles.

The AC BALANCE pot is not easy to get to.

The voltage cap has been replaced but not the diode.

It's always something weird.

Thoughts?

Best 73,

Gary H. Harmon Jr. / K5JWK
6003 Archwood
San Antonio, TX 78239-1504
(210) 657-1549 home
(210) 884-6926 cell
gharmon at idworld.net


-----Original Message-----
From: n2lxm at juno.com <n2lxm at juno.com> 
Sent: Monday, June 12, 2023 4:13 PM
To: k5jwkgary at gmail.com
Cc: Heathkit-Radios at groups.io; Heathkit at mailman.qth.net
Subject: Re: [Heathkit] [Heathkit-Radios] IM-5228 VTVM

Good Afternoon Gary,

        I have the same model. Check the filter cap and diode rectifier.
Mine was doing something like yours. Once a replaced the cap and diode,
cleaned the cal pots and switches. It works like new.


                                                    Jeff N2LXM
                                          Amateur Radio Operator
                                                      American
                                                        Patriot
                                     Proud Father of Two US Marines