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#1
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Write in problem: Seeburg L-100
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 |
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#2
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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 :-#)# -- (Please post followups or tech inquiries to the newsgroup) John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
#3
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Write in problem: Seeburg L-100
Im wondering if a weak OA2 tube could cause my write in problem. One
of them does not glow very bright. I do not have a read problem as the battery test works... John |
#4
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Write in problem: Seeburg L-100
Grojohn wrote:
Im wondering if a weak OA2 tube could cause my write in problem. One of them does not glow very bright. I do not have a read problem as the battery test works... John Well, a voltmeter check across the 0A2 should settle if it is good or not. Should be 150VDC across each. If OK, then check the 36 ohm write-in series resistor - I've replaced lots of those over the years. It is located near the test strip - shows up in the schematics - it opens up... John :-#)# -- (Please post followups or tech inquiries to the newsgroup) John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
#5
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Write in problem: Seeburg L-100
On May 16, 8:00*pm, John Robertson wrote:
Grojohn wrote: Im wondering if a weak OA2 tube could cause my write in problem. One of them does not glow very bright. I do not have a read problem as the battery test works... John Well, a voltmeter check across the 0A2 should settle if it is good or not. Should be 150VDC across each. If OK, then check the 36 ohm write-in series resistor - I've replaced lots of those over the years. It is located near the test strip - shows up in the schematics - it opens up... Got 150 vdc across each, 36 ohm is fine. Looking at the write in circuits, it looks like the contact on the SPU1 shorts the write in capacitor and write in trigger. I have confirmed this with a meter. The write in ground also meters ok from the TEU to plug A1 on the RCSU1. Using my meter, from write in ground to write in, the reading is 0 vdc, but when a selection is made the it jumps up as seen on the bar graph then back to 0 vdc. My selection switches are ok as I have metered them also. I also tried using jumpers on the RCSU1 to simulate the buttons being pressed. I can load all the torriods manually with the battery, but is there a way to load just one manually to verify the circuits in the tormat are ok. John |
#6
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Write in problem: Seeburg L-100
John, These models were notorious for edge connector problems (you've
heard this I'am sure). From what I recall, this particular printed stepper requires that both stepper wipers be at "home" position and making good contact with a contact at that position in order to pass the write-in pulse from the keyboard. The purpose of these contacts is to remove the pulse from the keyboard while the stepper is receiving. The older and later machines used contacts(which I eliminate) on a timing relay for this purpose. You should be able to test for stepper write-in by tapping out a set of pulses by shorting the wallbox signal line to ground. Also, IF this unit has a test link in the write-in circuit you should be able to open it and with power off, connect your meter to the contact that goes to the write-in contacts on both the stepper and pricing unit. If there is no such link on your unit, connect to one side of the write-in contacts (you'll have to try both) and the other side to chassis ground. Then with power still off, try pressing both a letter and number on the keyboard and see what reading you get, you should use a meter scale that can measure at least 5k-ohm because there are resistors that will bring the to-ground reading to at least that amount. The write-in goes first to numbers then to letters then to ground by way of a 4 point 7k-ohm resistor. BTW: have you tested the resistors in this section. If you have an assistant, have them hold down the buttons while you jiggle the edge connectors at the stepper and tap the stepper wipers and relays to check of any change in meter reading. The printed boards on both stepper and tormat power unit (TEU1)sometimes suffer from carbonization which bleeds away the write- in current, I have had to eliminate the printed foils and do point-to- point as well as eliminate the edge connector on these boards. You have done voltage readings that appear OK so this is unlikely to be the prob here. I have had two L-100s and one K (200) the latter went into commercial service and rather than dealing with the board problems which include burning up, I modded that machine to use a 201 back door. Frankly, although the L and K are favorites of mine they are a PIA to deal with. |
#7
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Write in problem: Seeburg L-100
Update:
Seems like my circuit through the RCSU1 is ok. I checked the resistance of all my resistors on the TEU board (pulled one leg off), guess what; there are about 16 of them out of tolerance... I will up date in a few weeks after replacing these... John |
#8
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Write in problem: Seeburg L-100
I just discovered somemore info:
Ok, I had 18 vdc across the tormat memory. Using ohms law, I figured I have 189.7mA going into the selected toroid. Question: Does anyone know what current total is need to write in a toroid? John |
#9
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Write in problem: Seeburg L-100
Grojohn wrote:
I just discovered somemore info: Ok, I had 18 vdc across the tormat memory. Using ohms law, I figured I have 189.7mA going into the selected toroid. Question: Does anyone know what current total is need to write in a toroid? John You measured this at the exact time you made a selection? |
#10
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Write in problem: Seeburg L-100
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 |
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