Jon - Do the current Mouser knobs have a brass insert that could be removed? I have similar knobs on a piece here that are plastic with a straight knurled...
My set failed when the external 9vDC power jackplug was knocked sideways; internal 2xAA in use. The power plug was repaired but the radio failed to start. Used...
Hi Karla, I assume you verified the LOCK switch is turned OFF? I would look very closely at the 9 vdc JACK soldered on the circiut board. These radios are...
Thanks John. The Lock Switch has been checked over a couple of times with multimeter. PCB-B has been checked kunder a magnifying glass. Indications are that...
Karla, I suggest first you install a new set of "D" batteries. Did you try that first? Pluging in the 9 vdc wall-wart causes the LCD Â to get dim? ...so the...
Karla - I think the "power switch circuit" is the on/off switch and maybe electrically near by circuitry. ... [Non-text portions of this message have been...
Hello John, First, many thanks for responding to this thread. Yesterday I strapped a set of C cells together as substitute for D cells - oops, I wonder if the...
Here are text-only steps taken to completely dismantle the radio for serious repair or maintenance. Suggestions for improvement are invited so that it may be...
Afternoon all, OK, I've had fun with my 4099, but I now have a TS570D which includes a full HF receiver so the 4099 is surplus to requirements. I've done the...
Okay...I've reviewed the posts but was wondering will the DX-440 work okay using an external 12 vdc? According to the user manual...there are 3 ways to power...
Any luck on your problem? I had this problem too but never figured it out. I wound up leaving the power on (with wall wart) and kept the volume turned down. It...
Go with the NINE volts! I bought my DX440 when I worked in the RS service centre years ago. Saw more than a few that did not survive higher input voltage well....
Hi all, Good Chatter on SSB USB 14.300 mHz...Maritime Moble net. http://14300.net Also good WxFax on 4.316 too! Running homemade 100 ft long wire 30 ft above...
Thanks ws8e, I've checked the power switch itself many times (many many times) and circuits nearby. Lately I thought that Q205-7 from the block diagram is a...
Hello SWLers, Hope you don't mind but I would like to introduce to you a Digital Ham Radio Group that is FREE to join and SWLers are welcome to join and...
Hi, Has anyone else had problems with the AC cord? Mine has an intermittant problem and I'm not sure if it is the wire near the plug, or the jack, which seems...
Yes, I found I had to hold the plug over to one side with a toothpick until I finally decided to open it up to fix it. The solder joints on the power plug can...
Still trying to fix the '803A from time to time. I compared voltages with the '440 during a couple of troubleshooting sessions but found nothing obvious to me....
A few Suggestions- Â Connect your external long wire antenna to the phone jack on the back of the radio, set the ANT switch to EXT then turn on radio. Turn up...
Correction...The RF GAIN does work with the INT Antenna SW on...I needed to put my hand on the telescopic antenna! John ________________________________ From:...
The BFO seems to have stopped working on my DX-440. It has the fine-tuning mod and everything works fine on AM. When BFO is switched on, audio volume goes to...
I suggest you visually inspect the BFO pot (VR-203) snd BOF switch (S 202)wiring. Look at the Block Diagram and you will see the BFO switch is connected to the...
... Yup.Just posted a pic of my Matsui with her new knobs.They came off an old multiband radio that I had lying about.They were just a push- fit replacement....
After staring at schematics available in this group, I figured it out. I didn't have a solder sucker so instead I cut a slice out of the copper strip leading...
It was my mod handiwork, not the switch. Everything is working perfectly. The fine-tuning mod is great, should've done it years ago. Next project is figure out...
