Dave -
No, there is no jumper in the TR-4. The jumper in the TR-3 was to turn the internal PTO on,
removing it allowed the internal PTO to be controlled by the RV-3/4.
Check Pin 7 in the TR-3, one of the corner pins, for 12 VAC. It's not switched or anything, so if
it's not there you'll have to pull the connector to check the wiring underneath.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Curt wrote:
You can generally see the jumper without removing the bottom case. In my TR3's, the jumper was
routed across the top of the connector. In another it went around the side..but both were visible
thru the cutout.
Curt
On 3/27/2012 4:35 AM, Dave, WV9E wrote:
*Hello to the group.*
**
* Hooking up RV-4 to first version TR-4, (no noise blanker in lower right)
26000 s/n.*
* Dial lamp and tube do not light. I test fed the*
*circuit (pins 7 & 8) lamp lit and tube heaters*
*started to glow.. so cable is good.*
**
* I read that the TR-3 had a jumper internal on the VFO jack (between 2 & 8 orange and white) and
this needs to be cut. As I have heard the first tr4's were actually just updated tr3's does
this jumper in place cause my issue w/ no power to lamp/tube heater?*
**
* I know this is probably a look and see thing, but before I take the cover off, maybe someone
else has seen this and I am wrong about my assumption and should be looking elsewhere.*
**
*tnx.,*
**
*73,*
*Dave, WV9E *
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