Craig -
For what it's worth, I agree with Jeff! :-)
Even if the LED shorted, it still should NOT blow the fuse, since the
limiting resistor will handle the difference in most cases.
If the LEDs were of the bayonet base type that just plugged in, Jim
probably had the answer. The terminals on the pilot lamp sockets turn,
and then short to the chassis. Same problem in the 4 Line pieces.
So the problem is NOT the LEDs themselves, the exact same problem can
happen with the bulbs in there.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
Craig Roberts wrote:
I think you may be onto something, Jim! Some time ago my PTO and
meter dial lamps were replaced by LEDs. This is a practice frowned
upon by the likes of Jeff Covelli. He objects on aesthetic grounds
("not original") but also because these devices occasionally short out
causing, in his words, "some problems."
I may have experienced one of these problems. Here's the clue: When I
last powered up the rig, just before it blew, I noted that the PTO
light was dead. Now, according to the schematic, it's wired in
parallel with the meter lamp so it must be faulty, eh?
Once I receive my replacement fuses and tantalum caps (I ordered
spares just in case) and install them, I'm going to cut the LED out of
the circuit and give it a whirl. If that works, I'll install my
rewired power supply board again. If all is still well, I'm going to
take Jeff's advice and restore the original #53 incandescent lamps.
Here's hoping. Whaddya think, Jim?
Many thanks for your wisdom.
73,
Craig
W3CRR
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