Swap out the molex connector to Jones type on a MK4

[Trapper_267]

I got a friend who has the MK4 and it has the cheesy Molex connector and i'm looking to swap it out with the 310 series Cinch Jones style.

I can get the plug and socket, But i can't find the e-clip's to hold the socket in the radio. They make a socket with the bracket's on it, But that's not the way it was done on a MK4A.

I seen a post from Stranger who replace these Cinch Jones connector's, But he had those e-clip's.

And as far as the plug goes, I'd like to use the 90* version as well then to won't stick out of the back so far.

I will also have to enlarge the hole for the jones socket.

Anyone have any pointer's on how they did this?  Help me out here Mr. Nomad.

Thank's Trapper 267 or just 2WR/NB267 Colorado

[2600]

I have a bench file with the wire colors and pin numbers. I'll extract it from the air-gapped computer where it lives. Seems to me we have some pics of this process, as well.

That connector was originated by the Cinch-Jones company, and got nicknamed "Jones" plugs. In the 1980s a second source for this type connector appeared, using the name "Beau". The socket held in place by two "C" clips was their invention. Eventually this company and their product line faded away.

We use the version with a mounting ear on each long side. At least I can still get them from industrial suppliers. Or fleabay.

The side-exit plug housing is a great idea, but not so easy to track down.

I'll port those files when I get back to the shop.

73

[Trapper_267]

Thank's for the get back Mr. Chris (Nomad).
I'll be looking for your info.
Thank's for all you do for us CB'r.

[Trapper_267]

Barkett sell's the Socket for the reciever.


stores.goldeneagleradios.com/receiver-power-cord-socket/

Fixer say's it comes with the c clip's

[2600]

The hole in the rear of a receiver with the Molex connectors must be enlarged to accept the larger Jones socket. The Beau socket requires an accurate, tight fit in that hole to be stable. Wasn't a problem for Browning. They had the hole punched. But if you enlarge it manually, accuracy counts. We use the Cinch-Jones version with a bracket on each long side of the socket. The rear apron of the Mark 4 receiver is just tall enough to accommodate it. And a bit of metalworking sloppiness on one edge of the hole won't affect its stability.

My effort to copy over decades-old bench files from our airgapped computer got snagged. But I got decent pics of the plug side of the proposition from a repair last week. So here is that half of the proposition. Just gotta grab enough of those magic "round tuits" to get the reciever socket side of this changeover written up and posted.

For now, here's half of it.

Here is a problem we see more and more often. The Browning Mark 4A base station has a separate cabinet for the transmitter and receiver. A ten-pin plug joins the two, with the socket on the rear of the receiver, and this plug at the end of a cable from the transmitter.

Has seen better days. Someone tried to "clean" it by scraping away the precious shiny plated later on the contact blades.



And then they tried to improve conact spring pressure by adding a layer of solder to the surface.



That shiny electroplated layer is there to resist oxidation. The base metal under it will tarnish in a week, more or less and have to be cleaned way too often to prevent noisy connections. And solder will oxidize as well. Just not such a good choice to get a quiet connection.

A look inside reveals a new puzzle. There should be a gray wire in this cable. Where is it?



Whoop, there it is. Got shortened somehow, and a lame black wire was almost soldered to the end it.



The old plug had a right-angle hood, but didn't have a clamp for the cable. The replacement has the wire exiting straight out the back of the plug, and has a clamp, to boot. The individual wires were trimmed to match the inside of the right-angle hood.



Didn't want to shorten this cable any more than necessary, but making the wires for the center-most pins a bit shorter, and the outer pins longer just works better. Here the odd-numbered pins have been connected, with the orange wire on pin 1 and the blue wire on pin 9.



The even-number side gets done next with the white wire on pin 2 and the gray wire on pin 10.



At least it's prettier now. And we get to find out if the fattened blades on the old plug have ruined the spring tension on the socket side.



If you ever contemplate buying a Mark 4A base radio, have a close look at this plug. Kinda like checking a horse's teeth before whipping out the money to buy it.

73

[cbrown]

Oct 18, 2022 23:00:03 GMT -5 2600 said:

If you ever contemplate buying a Mark 4A base radio, have a close look at this plug. Kinda like checking a horse's teeth before whipping out the money to buy it.

I like that analogy, perfectly describes checking for wear & tear on any older equipment.

[Trapper_267]

Thank's for the get back, Chris.
As far as i've seen on the plug coming off the Transmitter it's pin to pin, or 1 to 1, 2 to 2 and ect.

Pin 1, Orange.
Pin 2, White.
Pin 3, Red.
Pin 4, Brown.
Pin 5, Green.
Pin 6, Purple. 
Pin 7, Yellow.
Pin 8, Black.
Pin 9, Blue.
Pin 10 grey or Tan.

Now the socket is the fun part. Since i ran the oem style socket i wanted to run all the wires long enough to insert the socket after the wires were soldered to the socket. 
I had a part's MK4 that was already wired for the Jones plug and the reciever had already had the Power supply stolen out of it. I fiugured it would be a good canadate to copy the wiring from and make a template for the jones socket.

So i cut out a area in the base of the reciever to include this hole to make and aligned it with the ext speaker jack hole and the meter zero control hole's. Well i axually removed the nut's holding these 2 control's and put my template over them and secured my template to the base with the nut's. I then scribed a mark on the 4 base and started making the new hole matech my template.

I used my 1/4 inch hole punch i have to remove the excess and then a file to fit the socket inside the new larger hole.

Alot of work but it is what it is.

Now to figure out the wiring going to the Jones socket. 

So far i have figured out that Pin's 8 and 10 go to ground at the same spot the ground was at on the molex connector at the ground lug close to the tripple can cap and there is a .001 cap bridging pin's 9 and 10.

I'm still in work process on the rest of the wires to this jones socket.

Later's Trapp.

[2600]

Took long enough, but here is the text-only rundown on the inside of the receiver. This list reflects the fact that we never hooked up the regulated negative 9 Volts DC to pin 2.



FILENAME: MKIVWIRE.DOC 4-22-01 C.R. REV.11/24/13

WIRE COLOR, FUNCTION, RECEIVER DESTINATION FOR THE MARK 4, ESPECIALLY THE EARLY PRODUCTION WITH THE MOLEX PLUG (UGH!) THIS LAYOUT IS CORRECT FOR CONVERTING IT TO THE 10-PIN JONES PLUG.

JONES PLUG PIN # COLOR FUNCTION RX CONNECTION

1 ORG 6.3VAC BLACK WIRES AT JCT.W/SOLID GRN XFMR WIRE
2 WHITE NEG.9VDC NOW-MISSING V.REG
3 RED +350V LOW SIDE R10/C3c
4 BROWN -45VDC BIAS FILTER/BRIDGE
5 GREEN +380V HIGH SIDE R10/C3b
6 VIOLET +11DC 11V BRIDGE/C5
7 YELLOW +230VDC JCT. R12/C9
8 BLACK GND CHASSIS AT C3
9 BLUE +230V/RX R238,R3,ETC.
10 GRAY GND CHASSIS AT C3

Might wish to consider adding length to terminate the black wire at the ground lug for the heater winding instead, especially if the transmitter has the later, separate heater-return wires hooked to the black wire inside the transmitter. Not much reason to do this if the black wire is grounded in the transmitter at the same tie-strip lug as the gray wire.

-->> Inside Receiver <<--
1 Black 6.3vac to heater secondary
2 NC, was -9VDC for MKIV 1302 ROM
3 Green (or Blue) B+ from C3C+R10 1k 2W upgraded to 5W
4 Orange stranded wire -45VDC from C4/D1
5 Orange short wire from C3B+R8+R9+R10
6 White (Biege?) 13V from D3+C5
7 White (Biege?) from R12+C9 says +230 on schemo
8 Yellow Ground to lug at C3
9 Brown switched +230VDC to Rx board+R3 22k10W
10 Violet Ground to lug at C3



No pictures. Never got that 'round tuit', but here's the raw data, at least.

73