[Hallicrafters] FPM-300 question

[Bob Flye]

Thanks Dale!
I appreciate the input.  The 12 volts is not shorted to ground, it starts out at about 18 Ohms and goes up to 110 Ohms as the electrolytics charge.  18 Ohms at 12 volts is only 600 mA, which is well below the 1.5 amp rating of the bridge.  I think I want to change C106 before I add the jumper, $1.98 is cheap insurance against a bad electrolytic.  The 3000 uF cap has already been changed.
The inside of mine is dusty, you cannot even see into the final tube it is so bad, I was really impressed by how clean and nice yours is, thanks for the link.  This is going to be a fun project, I am taking it slow so I do not blow it up.
 
72/73
Bob, AD7BP


"You are boldly going where no man knows what he is doing"  -Maarten Schmidt, Palomar astronomer-


----- Original Message -----
From: Dale Parfitt <parinc1 at frontier.com>
To: Bob Flye <swlandham at rocketmail.com>; Hallicrafters at mailman.qth.net
Cc: 
Sent: Sunday, July 29, 2012 2:27 PM
Subject: Re: [Hallicrafters] FPM-300 question

Hi Bob,
In my manual, pins 5-6 are jumpered for AC operation.
12-14 AC ground
8 is AC hot
2 is AC neutral
Although my schematic does not  show it, 4-7 are jumpered on my plug. I see 
no other way for 12.6VDC to get back to the rig- as you said. Have you put 
an Ohm meter on the 12.6VDC line to see if it is shorted to ground?

Brand new stainless cabinet clasps are still available.
I would highly recommend, once you get her running that you install a 
Cumbria Designs X-Lock VFO stabilizer. With it installed, the rig sits 
within 10Hz all day long. Without it, there is constant drfit even when just 
receiving.
You can check out my 300 at:
http://www.parelectronics.com/vintage-hallicrafters-fpm-300.php
GL,
Dale W4OP

----- Original Message ----- 
From: "Bob Flye" <swlandham at rocketmail.com>
To: <Hallicrafters at mailman.qth.net>
Sent: Sunday, July 29, 2012 4:23 PM
Subject: [Hallicrafters] FPM-300 question


Greetings all,
I am new to the list. I just got an FPM-300 radio that is in need of repair. 
The D303 bridge on the power supply board was toasted, and several caps were 
obviously in need of replacement. I took care of all of those. When I 
powered it up, there was nothing, well, except for the hum of the rig. I 
have one question, I found pins 4 and 7 jumpered on the Jones plug, since it 
was not in the original schematic, I clipped it out, but looking further, it 
looks like pins 4 and 7 NEED to be jumpered to get 12 volts to the circuit 
boards. As an aside, pins 4 and 7 were penciled in on the schematic as 
connected. The D303 mentioned above is the one that supplies 12 volts also.

Does pin 4 and 7 need to be jumpered?
How bad is it to change the drive belt for band changing? I got a drive belt 
on ebay, it is run with cord now.

More questions will come up as I get deeper into the rig.

THANKS!!!!
72/73
Bob, AD7BP


"You are boldly going where no man knows what he is doing" -Maarten Schmidt, 
Palomar astronomer-
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