[TowerTalk] G-800s Rotator Control lamp issue

Larry Banks larryb.w1dyj at verizon.net
Thu Jul 13 16:39:44 EDT 2017

Thanks Mike,

There is a 22 ohm resistor and then four resistors (R1501,6,7,8 labeled “JP”) going back the the 7812 regulator.  I have no idea what “JP” means!   (Does anyone know???)  I hopefully expect to figure this out – Ohms Law rules!

I do have a pile of LEDs in my junque-box.  Guess I’ll just have to experiment.  Yes – exercising the connectors will be my first test. 

I will have to wait until after this weekend’s two contests.
73 -- Larry -- W1DYJ

From: Mike Fahmie 
Sent: Thursday, July 13, 2017 15:34
To: Larry Banks ; Ham - Tower Talk 
Subject: Re: [TowerTalk] G-800s Rotator Control lamp issue

I looked through all of my Yaesu rotor manuals and there is no part number shown for the bulb, only the rating of 12v @ 100ma as you already knew.  I recall that others have taken the opportunity to replace the incandescent bulb with LED's (remember to include a diode in addition to the limiting resistor since the bulb is powered from AC).  Choosing a colored LED can add a 'Techie' look to the display!

If the bulb connects to the PC board with a connector, it might be worthwhile to cycle the connector once or twice in case it's not making reliable contact.



From: Larry Banks <larryb.w1dyj at verizon.net>
To: Ham - Tower Talk <towertalk at contesting.com> 
Sent: Thursday, July 13, 2017 11:51 AM
Subject: [TowerTalk] G-800s Rotator Control lamp issue

Hi all,

The “scale lamp” in my G-800S control (PL1 – 12v 100ma) has failed after being intermittent for a bit.  (Hitting the box no longer brings it back to light...)  It could just be a cold solder joint that finally gave way – controller is about 10 years old.

Anything I need to know before I tear into the box to fix it?  Anyone know the Digi-Key part number?


73 -- Larry -- W1DYJ



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