A label of "JP" on something that looks like a resistor is probably a zero ohm
resistor, also known as a "jumper". They actually make those for automatic
circuit board stuffing machines where you might otherwise put in a wire to
connect things that you can't automatically route with the circuit board tracks.
David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net:7373
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Larry
Banks
Sent: Thursday, July 13, 2017 20:40
To: Mike Fahmie; Ham - Tower Talk
Subject: Re: [TowerTalk] G-800s Rotator Control lamp issue
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.
-Mike-
WA6ZTY
--------------------------------------------------------------------------------
From: Larry Banks <larryb.w1dyj@verizon.net>
To: Ham - Tower Talk <towertalk@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?
Thanks,
73 -- Larry -- W1DYJ
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