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Old May 15th 10, 06:03 PM posted to alt.collecting.juke-boxes
John Robertson
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Posts: 901
Default Write in problem: Seeburg L-100

Grojohn wrote:
I have a write in problem.

I have the manual, but the tests are for models 101,161, and 201. My
TEU board and RCSU1 board have the same test points, so I think the
tests are will work.

Ok, Test B works; Thats when i unplug the memory unit RCA jack, do a
scan and touch from test point C to the inside socket for the memory
unit on the TEU board. GOOD!

Next, test C works, the battery trick; GOOD!

Now it tells me to use test G to pinpoint.

Test G tells me to connect a test lamp from point D to A. This is
from the write in points(D) to ground (A).
My lamp does not glow and i make a selection and my lamp does not
glow, so it tells me to go to test J.

(my lamp is homemade; its a 28volt lamp with leads, and I tested it
with a 9 volt power supply and it did light)

Ok, onward to test J. I remove the jumper between test points D and E
and hook up my lamp. It does NOT show a dim glow. Its says it lamp
does NOT glow, replace "selection receiver (defective write in
electronics)".

SO, im guessing that my selection reciever is my TEU board.

Im getting good voltages -300 is about -298. The -150 is about -149,
and the -147 on the anode of the diode is there. The cathode to ground
measures 0 volts. Also, i pulled the diode and tested with meter and
it seems ok.

I have inspected and tested signals all the way up to the RCSU1. I
repaired the wiper contact on the SPU1.

I have also recapped the TEU board, but did not replace any tubes.

HELP!

John






John, the main problem is you are not usingthe correct lamp. The Seeburg
Test Lamp is a specially chosen NEON lamp - not unlike the ones you can
pick up at your local hardware store - however they are selected for
thier voltage response. If I am not mistaken the standard Neon Glo-Lamp
test needs around 90 VAC to work, whereas Seeburg selected NEON lamps
that glowed around 80VAC. I could be wrong...

Still, using a regular Neon Glo-Test device will work for most
troubleshooting situations with the Seeburg test system.

http://commons.wikimedia.org/wiki/Fi..._Test_Lamp.jpg

John :-#)#

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