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#11
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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
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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
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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
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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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