Go Back   WorldwideDX Amateur Radio Forums > Citizens Band Related > General CB Services Discussion


Amateur Callsign Lookup
Enter Callsign:

need help with President Washington w/upD858

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 04-08-2009, 03:52 AM
Senior Member
iTrader: (0)
 
Join Date: Nov 2008
Location: Tug Hill NY
Posts: 189
skybolt58 is on a distinguished road
Default need help with President Washington w/upD858



I got this president washington with the 858 chip, Now the rec. is low and I installed one of those 621 pre amps. it helped a little, but not like it was when new. Now I was told the am regulator needs to be replaced because they are a known bug? Where is it? also it is starting to have a modulation glitch, when I key up for the first second or so. they say I sound fuzzy? but after a bit it clears right up? now could that be the audio IC? where is it? there is no cb shops anywhere near me. I am handy with soldering so that isn't a problem? but tuning is?

ALSO? is there a way to hard wire in a freq counter in the 858?


Reply With Quote
  #2  
Old 04-08-2009, 05:16 AM
Bionic Chicken's Avatar
Senior Member
iTrader: (0)
 
Join Date: Jun 2008
Location: South Mississippi
Posts: 383
Bionic Chicken is an unknown quantity at this point
Default

Rather than throwing parts at the radio it sounds like it needs a good alignment on transmit and receive. Once that is completed you will be able to tell if there is a component problem. Changing parts out with a bad alignment can actually cause you more problems than you have.

BC
__________________
BC

Reply With Quote
  #3  
Old 04-08-2009, 07:01 AM
Senior Member
iTrader: (0)
 
Join Date: Nov 2008
Location: Tug Hill NY
Posts: 189
skybolt58 is on a distinguished road
Default tired ol washington

I did bring it to a place just up past watertown ny. he said it is old that he did the best he could. the tuning problem is once I do replace parts. it is tuned the best it can be. it is LOUD but fuzzy in the first second or 2 then cleans right up. and this is on many mics. I don't know, I just may trash it! it is over 35 years old

Reply With Quote
  #4  
Old 04-08-2009, 05:10 PM
mechanic's Avatar
Senior Member
iTrader: (0)
 
Join Date: Mar 2009
Location: North coast of the USA.... Da UP!
Posts: 380
mechanic is on a distinguished road
Default

The older 858 chassis is a great one but had a few bugs. From your description sounds to me like it might be the T/R relay... Not easy to find a new one... But! It can be cleaned...
The plastic cover is held in place buy two cleats, one on each side... You can make a tool to remove this cove by taking a cheap screwdrive and bending the tip into a J shape then as you pull the side carefully away, lift and do the other side whilst holding up. A bit tricky but just be careful!
Do not use anything harsh on it like a spray or a file. You need to burnish the contacts, there is a tool made for this but I found that using a match book striker works pretty good, just tear it off so it is small enough to work with and gingerly, carefully clean the contacts. You just want to make them clean not ware them down to the base metal.....
FWIW... If the AM regulator was bad there would be no AM carrier....

Good luck! Mechanic

Reply With Quote
  #5  
Old 04-08-2009, 09:47 PM
Senior Member
iTrader: (0)
 
Join Date: Nov 2008
Location: Tug Hill NY
Posts: 189
skybolt58 is on a distinguished road
Default web info I found

Thanks for the scary info, I was told to stay awat from that relay because they were like gold! but about the regulator, below I found on many web sites?



KNOWN BUGS


The AM regulator 2SC1419 is WEAK. UNSOLDER it and toss it in the trash.
Replace it with a GE-66, ECG-152 or a NTE-152.
Relay buzzes on SSB, no am transmit, lights go dim, or the fuse pops sometimes?
Replace C179 ( a 2.2uF 25v tantalum cap located near finals) with a standard 2.2uF electrolytic capacitor.
PAY ATTENTION to the "+" and "-"!!!

Reply With Quote
  #6  
Old 04-09-2009, 09:05 AM
mechanic's Avatar
Senior Member
iTrader: (0)
 
Join Date: Mar 2009
Location: North coast of the USA.... Da UP!
Posts: 380
mechanic is on a distinguished road
Default

Cleaning the relay isn't too hard, just be careful! Just one or two strokes of the burnishing tool should be all it needs!

mechanic

Reply With Quote
  #7  
Old 04-09-2009, 09:13 AM
mechanic's Avatar
Senior Member
iTrader: (0)
 
Join Date: Mar 2009
Location: North coast of the USA.... Da UP!
Posts: 380
mechanic is on a distinguished road
Default

BTW it will not hurt to replace the regulator either, it is located screwed to the heatsink toward the back of the radio. Replace the tantalum capacitor, it is blue and located between the finals about an inch into the board. You can use an ordinary polarized one of the same value.

mechanic

Reply With Quote
  #8  
Old 04-09-2009, 11:46 PM
Senior Member
iTrader: (0)
 
Join Date: Nov 2008
Location: Tug Hill NY
Posts: 189
skybolt58 is on a distinguished road
Default OK?

Hmm,, which one is the am regulator and here is a pic..
Attached Images
File Type: jpg 04102009.jpg (276.9 KB, 25 views)
File Type: jpg 04102009_002.jpg (265.9 KB, 19 views)

Reply With Quote
Reply

Bookmarks
Worldwide Radio Forum



Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 06:09 AM.


Powered by vBulletin®
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0
Worldwide Radio Forum