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Fixing a Midland 4001 - Requesting Component I.D. Help.

naz007

Newbie
Joined
May 30, 2024
Messages
4
So I got this used 4001 ( made, according to the board date, Dec 21, 2004, newer than I thought) and it worked when I plugged it in, transmitted and received ok. About a week later I plugged it in to play around with it but now there's no power. I'm 99% sure I didn't plug it in the wrong way because the plug only goes in one way. But that 1% says I could have done SOMETHING without realizing. On taking it apart I noticed a few components that are suspect, one is a 1000uF 25v electrolytic cap (in the back corner near the power plug) which is slightly bulged on top, not popped. Not sure if this was failing and finally failed but I'm going to replace it anyway.
Other parts which I need to ID (2 views of each pictured below) are the silvery oval shaped parts with brown goo on them (Capacitors?). The goo on those looks old, dry and crusty. I have the schematic but I'm not good at deciphering those. A parts diagram would suit me better because it shows each part in it's actual position.
I'm sure someone knows what these parts are called/values etc, or knows of an actual board layout I could refer to.
Cheers!
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RFI-EMI-GUY

Member
Joined
Dec 22, 2013
Messages
7,253
That tall silver can are crystals used for IF filters and reference oscillator (the one with red trimmer capacitor near it). It was common to cement these parts against vibration and the cement decomposes. Use a solvent and toothpick, to carefully remove the gummy stuff from the PCB solder traces around the crystal and nearby parts. Avoid getting any solvent into the red trimmer. I doubt these parts are causing a no power situation, so proceed to fix that first.
 
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