The AM Forum
October 04, 2024, 11:46:54 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Calendar Links Staff List Gallery Login Register  
Pages: [1]   Go Down
  Print  
Author Topic: R390 won't turn off??!! - - - -  (Read 5139 times)
0 Members and 1 Guest are viewing this topic.
W2INR
Radio Syracuse
Founding
Member
*
Offline Offline

Posts: 1149

Syracuse Radio W2INR


WWW
« on: March 08, 2009, 09:48:11 AM »

When I go to turn the rig off the light on the Read out stays on. The standby position is working because the receiver goes dead.

Is there a relay?

Anyone experienced this or am I just a lucky person?

G
Logged

G - The INR


Amateur Weather Station KNYSYRAC64
Creator - owner - AMfone.net - 2001 - 2010
Founding Member - NEAR-Fest
SWLR-RNŲ54
Dave KA2J
Contributing
Member
*
Offline Offline

Posts: 121



« Reply #1 on: March 08, 2009, 10:19:51 AM »

Hi Gary.  This is very common.  The little micro switch is hanging up.  Both of my R-390A's do this on occassion.  Turn of the receiver and give the "on/off" knob a lite tap with a soft mallet or piece of wood.  Works everytime for me.  Dave KA2J
Logged

Dave KA2J
W2INR
Radio Syracuse
Founding
Member
*
Offline Offline

Posts: 1149

Syracuse Radio W2INR


WWW
« Reply #2 on: March 08, 2009, 10:42:19 AM »

Got it Dave.  TNX
I shot some De Ox down in there and flipped the switch back and forth two times and it started working.

G
Logged

G - The INR


Amateur Weather Station KNYSYRAC64
Creator - owner - AMfone.net - 2001 - 2010
Founding Member - NEAR-Fest
SWLR-RNŲ54
W2PHL
Contributing
Member
*
Offline Offline

Posts: 146


Phil


WWW
« Reply #3 on: March 08, 2009, 05:36:19 PM »

That little micro switch can be a problem. If it continues to act up, drop the front panel and unscrew the switch from the mounting plate. Be careful not to lose the washers/spacers on the assembly. The switch is riveted together, but it can be GENTLY pried enough to shoot some deoxit straight inside. That should fix it for awhile.

Phil
Logged

I think therefore AM
W1VD
Contributing
Member
*
Offline Offline

Posts: 401



« Reply #4 on: March 08, 2009, 10:30:49 PM »

The quick fixes only work for a while. Fair Radio sells replacement switches.
Logged

'Tnx Fer the Dope OM'.
Roy K8VWX
Contributing
Member
*
Offline Offline

Posts: 121


Pr. 4 -1000s Mod Pr. 5868


« Reply #5 on: March 09, 2009, 08:07:45 AM »

        I use a thermister for a soft start in the ac line in all my receivers.I have had no trouble with welding of the micro switch contacts in my 390A's since doing so.I don't remember what  value I used but use one that can handle the current and have the highest ohmic value COLD. You can see this soft start in the pilot light when first turned on.Do not cut the leads on the thermister and place it away from any other components,wires etc. IT DOES GET HOT. 73/Roy
Logged
Roy K8VWX
Contributing
Member
*
Offline Offline

Posts: 121


Pr. 4 -1000s Mod Pr. 5868


« Reply #6 on: March 09, 2009, 11:18:54 AM »

         Just found the thermistor data I used. Mouser part # 527-CL80  3 Amps @ 47 Ohm cold. It is a good Idea if only to save the inrush current on the tube filaments.
Logged
KA2PYQ
Guest
« Reply #7 on: March 10, 2009, 07:12:48 PM »

With no power plugged in, work the switch strongly while
blowing (maybe through a straw) on any holes on the switch.
Allow your breath inside to dry a few minutes. Then squirt
some freon through a nozzle or pipe until the switch about
turns into an igloo. Work the switch every now and then as
the switch goes from cold and snowy to wet to warm and dry.
This sometimes cleans things "forever". This works on
potentiometers too, and sometimes flakes dirt or grease off
too.
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
 AMfone © 2001-2015
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Page created in 0.05 seconds with 19 queries.