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Write in problem: Seeburg L-100



 
 
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  #11  
Old May 28th 10, 04:50 AM posted to alt.collecting.juke-boxes
Tony[_4_]
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Posts: 50
Default Write in problem: Seeburg L-100

Grojohn wrote:
You measured this at the exact time you made a selection?


I had to hold the subtract solenoid in on the credit unit to see the
voltage otherwise my meter would just flash too quick to see.

John


OK, that sounds feasible. You did have me wondering!
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  #12  
Old May 30th 10, 04:00 AM posted to alt.collecting.juke-boxes
Grojohn
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Posts: 19
Default Write in problem: Seeburg L-100

Ok, still troubleshooting this write in problem.

The battery test works, it will read out perfect!

The wipe on the subtract solenoid works, when I hold it in I get
-19vdc on the write-in line.

I tried to eliminate the RCSU1 board by removing it, then using
jumpers to complete the circuit. Here is how i wired it:
http://home.comcast.net/~carniello/write.jpg. (this bypasses the
selection buttons but it is set-up like i selected number "3" and
letter "C".

By looking at the schematics and the write in circuit diagram, my
circuit should be correct.
I do have 19vdc from write in to ground, but only when the write-in
line is disconnected to Memory B3. When the circuit is together, I get
no voltage on the write-in line when wiper on subtract solenoid is
made.

Now Im starting to think there is not enough power coming from the TEU
board when the circuit is complete. Like I said, I'm taking the write-
in straight from the TEU board and using jumpers, the memory
connector, and a 18k resistor.

When the circuit is complete, no voltage
When circuit is not there, I get -19vdc from write-in to ground.

Reading voltages off the board are correct, -400 at pin 6 of 6x4, -147
at the diode, etc...
I also have that -19vdc on the cathode of the diode when the circuit
is NOT complete and wipe is made; otherside its 0vdc.

Help!

John








  #13  
Old May 30th 10, 08:44 PM posted to alt.collecting.juke-boxes
Grojohn
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Posts: 19
Default Write in problem: Seeburg L-100

Ok,

Just discovered something else. If I take the write-in line to a 18k
resistor then ground and manually engage the subtract solenoid, I get
10 vdc across the resistor. Again, if the circuit is open and engage
the subtract solenoid, I get 19 vdc.

Ok, so I hooked up another meter in series with that 18k resistor to
monitor the current draw. I get 10 vdc but only .5 mA. I dont think I
have enough current to preform the write in.

John
  #14  
Old May 31st 10, 08:19 AM posted to alt.collecting.juke-boxes
Rob in NYC[_2_]
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Posts: 103
Default Write in problem: Seeburg L-100

On May 30, 2:44*pm, Grojohn wrote:
Ok,

Just discovered something else. If I take the write-in line to a 18k
resistor then ground and manually engage the subtract solenoid, I get
10 vdc across the resistor. Again, if the circuit is open and engage
the subtract solenoid, I get 19 vdc.

Ok, so I hooked up another meter in series with that 18k resistor to
monitor the current draw. I get 10 vdc but only .5 mA. *I dont think I
have enough current to preform the write in.

John


John, I don't want to be pessimistic but measuring the W-I pulse
directly is likely to be misleading due to the fact that there are two
coils and caps in the circuit. The pulse has higher voltage "front"
and this was to overcome resistance that might build up in contacts in
the circuit that could cause erratic selecting.

You also need to use care with the tormat unit as I have bought
machines with some burnt out coils and they are bitch to fix.

I'm looking at a schematic of the w-i and after checking voltages
there are only a few resistors and caps plus one diode (never had
failure here). According to my notes the only problems aside from
contacts are the 120K , 3K and 47ohm res.

Resistors in high voltage pulse environments of break down in peculiar
way and it might be good to just change these three (if you haven't)
Other than that you may have a current leakage problem in either the
phenolic board, credit unit (often happens).

I have a simplified print of both w-i and r-o circuits that has been
all that I have ever needed get these going on location..the circuits
are really simple.....I'll scan/send if you want.

Lino
 




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