[Johnson] Ranger 1 with no grid current

[Todd Nannie]

On your suggestion I checked the resistor under the band switch shield and it was fine.

Thanks,
Todd
K2DN


--- On Sat, 5/28/11, Harry Vaught, KT4AE <kt4ae at bellsouth.net> wrote:

> From: Harry Vaught, KT4AE <kt4ae at bellsouth.net>
> Subject: Re: [Johnson] Ranger 1 with no grid current
> To: johnson at mailman.qth.net
> Date: Saturday, May 28, 2011, 4:51 PM
> I'm glad you found the problem with
> the 68k resistor.  That's the one I 
> was calling R8 or R6.  If yours is R5, we have yet
> another variant of 
> the schematic.
> 
> This may not have happened to yours, but I would remove the
> bandswitch 
> shield under the chassis and check R9.  I believe on
> mine that R9 was 
> cooked (split open, not visible from outside the shield)
> due to added 
> load from the bad R5/6/8, at any rate the 68k
> resistor.  When I found 
> this it solved a host of problems from CW chirp to grid
> current.
> 
> Fortunately, for me, I only had the problem with R5/8/6, R9
> and total 
> recapping.  I haven't had to do any heavy-duty trouble
> shooting of the 
> type you describe.
> 
> I know there is vastly greater knowledge on the Johnson
> reflector than I 
> have but it has been dead lately.
> 
> There's much more activity on "AMFONE.net".  I would
> try:
> 
> http://www.amfone.net/Amforum/index.php
> 
> There are Ranger questions all the time and I think you'll
> have better 
> luck there.
> 
> Good luck,
> 
> Harry
> 
> 
> 
> On 5/28/2011 3:14 PM, Todd Nannie wrote:
> > I found the problem.
> > R5 (68K ohm) resistor was bad(open), replaced it and
> now the Ranger seems to be working fine. Using a dummy load
> I can hear my CW and phone signals from another radio in the
> same room. I have no idea how much output I have. I need to
> hook it up to a watt meter.
> >
> > One problem I am having is that the OSC meter is
> peging hard to the right.
> > I have checked the 3 ohm SH1 resistor and it checks
> out at 3.5 ohms.
> > All of the voltages for the 6CL6 check out fine. I get
> negative voltage on pins 2 and 9 and the screen voltage is
> 99 volts.
> >
> > Any ideas?
> >
> > Thanks,
> > Todd M. Nannie
> >
> >
> > --- On Sun, 5/22/11, Harry Vaught, KT4AE<kt4ae at bellsouth.net> 
> wrote:
> >
> >> From: Harry Vaught, KT4AE<kt4ae at bellsouth.net>
> >> Subject: Re: [Johnson] Ranger 1 with no grid
> current
> >> To:
> >> Cc: johnson at mailman.qth.net
> >> Date: Sunday, May 22, 2011, 6:58 PM
> >> I've had the following affect grid
> >> drive on my Ranger:
> >>
> >> 1. Meter switch needed cleaning.
> >>
> >> 2. R8 or R6 depending on schematic, but at any
> rate the V3
> >> screen grid
> >> resistor had migrated to about three times its
> nominal
> >> value.
> >>
> >> 3. R9 toast. Mounted on the bandswitch under the
> >> chassis.  Accessible by
> >> removing the bandswitch shield.
> >>
> >> None of these resulted in a total absence of grid
> current,
> >> but it was
> >> certainly reduced in some cases.
> >>
> >> Good luck.
> >>
> >> Harry, KT4AE
> >> Maryville, Tennessee
> >>
> >>
> >>
> >> On 5/22/2011 5:21 PM, Todd Nannie wrote:
> >>> I have a Ranger 1 that is not showing any grid
> current
> >> on the meter when doing the tune-up procedure. It
> shows 32ma
> >> on the OSC setting, it shows a reading on Buffer
> and Plate
> >> (Don't remember exactly what those were) and no
> reading on
> >> Mod.
> >>>
> >>> I have replaced all of the electrolytic
> capacitors. Id
> >> not have a tube checker, but all of the tubes are
> at least
> >> getting warm/hot
> >>>
> >>> Any ideas?
> >>>
> >>> Thanks,
> >>> Todd
> >>> K2DN
> >>>
> >>
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