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Rowe R-92 Lamp Control Board Schematic
Looking for the schematic or component layout for an Rowe R-92 Lamp
Control Board (40821201). I need to make some repairs and the manual only shows a picture of one. It appears a light fixture shorted out at one time and someone tried to "repair" the board, with no luck. Ihave located the light issue, now I need to repair the board. Any help is appreciated. |
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Rowe R-92 Lamp Control Board Schematic
On Mar 26, 5:43*am, elkridge pinball wrote:
Looking for the schematic or component layout for an Rowe R-92 Lamp Control Board (40821201). You'd want the "Shop Service Manual" which comes in a brown flexible plastic 3 ring binder. It has at least 50 double sided 11" x 17" full size schematics, parts lists, and board layouts for every unit in the R92. You can still buy these through a Rowe distributor. Just say you want the "R-92 Shop Service Manual". Make sure they do not confuse it with the usual field service manual and field parts manuals. This one specifically says _SHOP_ manual. I have the R90 Shop service manual, but the light controller schematic is not the same part number that you mention. |
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Rowe R-92 Lamp Control Board Schematic
On Mar 26, 12:07*pm, Ken Layton wrote:
On Mar 26, 5:43*am, elkridge pinball wrote: Looking for the schematic or component layout for an Rowe R-92 Lamp Control Board (40821201). You'd want the "Shop Service Manual" which comes in a brown flexible plastic 3 ring binder. It has at least 50 double sided 11" x 17" full size schematics, parts lists, and board layouts for every unit in the R92. You can still buy these through a Rowe distributor. Just say you want the "R-92 Shop Service Manual". Make sure they do not confuse it with the usual field service manual and field parts manuals. This one specifically says _SHOP_ manual. I have the R90 Shop service manual, but the light controller schematic is not the same part number that you mention. Ken, Thanks for the help, let me double check that part number when I get home tonight, I grabbed that one online so I might be wrong. Thanks again, Jay |
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Rowe R-92 Lamp Control Board Schematic
On Mar 26, 10:43 pm, elkridge pinball wrote:
Looking for the schematic or component layout for an Rowe R-92 Lamp Control Board (40821201). I need to make some repairs and the manual only shows a picture of one. It appears a light fixture shorted out at one time and someone tried to "repair" the board, with no luck. Ihave located the light issue, now I need to repair the board. Any help is appreciated. Is this the one that drives the 15w 120v bulbs ? If it is, be very very careful, as the entire circuit floats at mains potential (transformerless). The logic voltage is derived from a large chain of resistors forming a voltage divider (I would give Rowe a 0/10 score for this design, as they could have powered the logic from the 8vdc /28vdc bus throughout the machine instead) IIRC The bulbs are driven by an SCR with a parallel diode facing in the opposite direction The reverse diode allows the bulb to be on on for 50% of the mains cycle (50% of the time) to act as a "poor mans dimmer", (very illegal too by state electricity board regulations as this method allows DC to flow in the system which will over time corrode earth stakes, metal underground pipes etc, not to mention an annoying flicker in the lights - at 50hz mains), while the SCR turns on the lamps for the other 50% of the mains cycle (giving full brightness) as required by the logic IC's to give the flashing effects to the beat of the music. If there has been a short circuited lamp holder, check both the diode and the SCR on that channel for damage, better still replace both of them. Other parts of the board shouldn't be affected. Again, and I repeat - BE CAREFUL, - the entire board is NOT isolated from the mains supply, and any part of it (including the logic IC's etc) can possibly be at mains potential and give you a nasty shock (and probably do further damage) if you touch it when plugged into the mains. Also too, on many of these machines the red "crimp" terminals used in mains lighting harness are starting to decompose and crumble away, exposing bare mains wiring underneath. Sometimes just touching or tapping them will make them disintegrate. I would strongly advise removing these and replacing them to avoid the risk of electrocution and more short circuits happening. |
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Rowe R-92 Lamp Control Board Schematic
On Mar 27, 12:20*am, kreed wrote:
On Mar 26, 10:43 pm, elkridge pinball wrote: Looking for the schematic or component layout for an Rowe R-92 Lamp Control Board (40821201). I need to make some repairs and the manual only shows a picture of one. *It appears a light fixture shorted out at one time and someone tried to "repair" the board, with no luck. *Ihave located the light issue, now I need to repair the board. Any help is appreciated. Is this the one that drives the 15w 120v bulbs ? If it is, be very very careful, as the entire circuit floats at mains potential (transformerless). The logic voltage is derived from a large chain of resistors forming a voltage divider (I would give Rowe a 0/10 score for this design, as they could have powered the logic from the 8vdc /28vdc bus throughout the machine instead) IIRC The bulbs are driven by an SCR with a parallel diode facing in the opposite direction The reverse diode allows the bulb to be on on for 50% of the mains cycle (50% of the time) to act as a "poor mans dimmer", (very illegal too by state electricity board regulations as this method allows DC to flow in the system which will over time corrode earth stakes, metal underground pipes etc, not to mention an annoying flicker in the lights - at 50hz mains), while the SCR turns on the lamps for the other 50% of the mains cycle (giving full brightness) as required by the logic IC's to give the flashing effects to the beat of the music. If there has been a short circuited lamp holder, check both the diode and the SCR on that channel for damage, better still replace both of them. *Other parts of the board shouldn't be affected. Again, and I repeat - BE CAREFUL, - the entire board is NOT isolated from the mains supply, and any part of it (including the logic IC's etc) can possibly be at mains potential and give you a nasty shock (and probably do further damage) if you touch it when plugged into the mains. Also too, on many of these machines the red "crimp" terminals used in mains lighting harness are starting to decompose and crumble away, exposing bare mains wiring underneath. *Sometimes just touching or tapping them will make them disintegrate. I would strongly advise removing these and replacing them to avoid the risk of electrocution and more short circuits happening. Thanks for the great explanation, learned a bunch!! The number on the board is 61022901, ckt bd assy - lamp control I'm looking at the board now, I see an obvious burn mark on one side of the 3 pin molex power plug (side opposite fuse) and a burn mark across 3 of the resistors in the voltage divider network. Almost looks like something may have shorted to the case at the resistors. It also appears the 3 SCR's were replaced at one time, (bad solder job!) and the fuse holder itself. No other obvious repairs. Thanks again.... |
#6
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Rowe R-92 Lamp Control Board Schematic
Success, kind of!!!!! Resoldered bad connections, and replace 2 diodes that were shorted, plugged everything in and lights came on (at least the ones that are there !!!!! The lights do the flash to the music however, the are at half brightness and go full when I move the selector switch, but never flash. Where does the brown/black wires go? I see the shielded pair goes to the amp, but not sure on the other two??? Thanks kreed for the helpful inf!!! |
#7
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Rowe R-92 Lamp Control Board Schematic
On Mar 27, 6:36*am, elkridge pinball wrote:
On Mar 27, 12:20*am, kreed wrote: On Mar 26, 10:43 pm, elkridge pinball wrote: Looking for the schematic or component layout for an Rowe R-92 Lamp Control Board (40821201). I need to make some repairs and the manual only shows a picture of one. *It appears a light fixture shorted out at one time and someone tried to "repair" the board, with no luck. *Ihave located the light issue, now I need to repair the board. Any help is appreciated. Is this the one that drives the 15w 120v bulbs ? If it is, be very very careful, as the entire circuit floats at mains potential (transformerless). The logic voltage is derived from a large chain of resistors forming a voltage divider (I would give Rowe a 0/10 score for this design, as they could have powered the logic from the 8vdc /28vdc bus throughout the machine instead) IIRC The bulbs are driven by an SCR with a parallel diode facing in the opposite direction The reverse diode allows the bulb to be on on for 50% of the mains cycle (50% of the time) to act as a "poor mans dimmer", (very illegal too by state electricity board regulations as this method allows DC to flow in the system which will over time corrode earth stakes, metal underground pipes etc, not to mention an annoying flicker in the lights - at 50hz mains), while the SCR turns on the lamps for the other 50% of the mains cycle (giving full brightness) as required by the logic IC's to give the flashing effects to the beat of the music. If there has been a short circuited lamp holder, check both the diode and the SCR on that channel for damage, better still replace both of them. *Other parts of the board shouldn't be affected. Again, and I repeat - BE CAREFUL, - the entire board is NOT isolated from the mains supply, and any part of it (including the logic IC's etc) can possibly be at mains potential and give you a nasty shock (and probably do further damage) if you touch it when plugged into the mains. Also too, on many of these machines the red "crimp" terminals used in mains lighting harness are starting to decompose and crumble away, exposing bare mains wiring underneath. *Sometimes just touching or tapping them will make them disintegrate. I would strongly advise removing these and replacing them to avoid the risk of electrocution and more short circuits happening. Thanks for the great explanation, learned a bunch!! The number on the board is 61022901, ckt bd assy - lamp control I'm looking at the board now, I see an obvious burn mark on one side of the 3 pin molex power plug (side opposite fuse) and a burn mark across 3 of the resistors in the voltage divider network. *Almost looks like something may have shorted to the case at the resistors. It also appears the 3 SCR's were replaced at one time, (bad solder job!) and the fuse holder itself. *No other obvious repairs. Thanks again....- Hide quoted text - - Show quoted text - Thanks kreed for all your help and info. Resoldered a few connections and replaced 2 diodes that were shorted and lights are on! I cannot get them to flash to the music however, any suggestions? Where do the controls wites offf P4 get conected? Thanks |
#8
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Rowe R-92 Lamp Control Board Schematic
On Mar 28, 10:33 am, elkridge pinball wrote:
Success, kind of!!!!! Resoldered bad connections, and replace 2 diodes that were shorted, plugged everything in and lights came on (at least the ones that are there !!!!! The lights do the flash to the music however, the are at half brightness and go full when I move the selector switch, but never flash. Where does the brown/black wires go? I see the shielded pair goes to the amp, but not sure on the other two??? Thanks kreed for the helpful inf!!! I haven't seen one of these boards for some years, but based on the typical setup rowe used for disco light control units in other models, there is an orange/black that is for mute (tells the lamp control that there is/isnt music playing and to go into the "attract mode" flash mode) . its earth return would appear to be via the mains ground (green/yel) or by the amp ground (via audio cable shield) The brown-black is typically used by Rowe in their other models as the +8vdc bus - direct from the power supply (before it gets to the on/off/ service switch assembly where it becomes a brown colour after the switch). if you mean a separate brown and black wire, the brown would likely be the switched +8vdc and the black would be a ground (negative) wire. This would simply provide power to the unit ? There should also be a pot to adjust the flash sensitivity. With a record playing, adjust this pot until the lights begin to flash to the beat of the music. If someone in the past has fiddled round with the unit, this pot has probably been altered too, stopping the lights from flashing to the beat properly Forgot to mention, all connections should be re soldered with a lead based solder (Don't use the politically correct lead free rubbish). Dry joints (particularly on backs of connectors) are a problem with all rowe solid state PCBs that I have ever seen. please double check all this info where possible before modifying anything or assuming anything is safe. If you want more exact answers, good resolution photos of the pcb (both sides) and outside of the unit showing the plug and wire colours will help enormously. These can be posted on a website and linked to here, or emailed direct to my email as attatchments. if you can post some detailed scans/pics of both sides of the board, and of the plugs, I can assist further |
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Rowe R-92 Lamp Control Board Schematic
On Mar 28, 2:31*am, kreed wrote:
On Mar 28, 10:33 am, elkridge pinball wrote: Success, kind of!!!!! Resoldered bad connections, and replace 2 diodes that were shorted, plugged everything in and lights came on (at least the ones that are there !!!!! The lights do the flash to the music however, the are at half brightness and go full when I move the selector switch, but never flash. Where does the brown/black wires go? *I see the shielded pair goes to the amp, but not sure on the other two??? Thanks kreed for the helpful inf!!! I haven't seen one of these boards for some years, but based on the typical setup rowe used for disco light control units in other models, there is an orange/black that is for mute (tells the lamp control that there is/isnt music playing and to go into the "attract mode" flash mode) . its earth return would appear to be via the mains ground (green/yel) or by the amp ground (via audio cable shield) The brown-black is typically used by Rowe in their other models as the +8vdc bus - direct from the power supply (before it gets to the on/off/ service switch assembly where it becomes a brown colour after the switch). if you mean a separate brown and black wire, the brown would likely be the switched +8vdc and the black would be a ground (negative) wire. This would simply provide power to the unit ? There should also be a pot to adjust the flash sensitivity. *With a record playing, adjust this pot until the lights begin to flash to the beat of the music. *If someone in the past has fiddled round with the unit, this pot has probably been altered too, stopping the lights from flashing to the beat properly Forgot to mention, all connections should be re soldered with a lead based solder (Don't use the politically correct lead free rubbish). Dry joints (particularly on backs of connectors) are a problem with all rowe solid state PCBs that I have ever seen. please double check all this info where possible before modifying anything or assuming anything is safe. If you want more exact answers, good resolution photos of the pcb (both sides) and outside of the unit showing the plug and wire colours will help enormously. These can be posted on a website and linked to here, or emailed direct to my email as attatchments. if you can post some detailed scans/pics of both sides of the board, and of the plugs, I can assist further Is the flash cicuit affected by the load on the circuit, many of the lamps are missing? I have ordered the proper colors but will not get them until Monday? I picked up some white 11 watt lamps just to test the circuits over the weekend. Thanks for all the great information. |
#10
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Rowe R-92 Lamp Control Board Schematic
On Mar 29, 2:14 am, elkridge pinball wrote:
On Mar 28, 2:31 am, kreed wrote: On Mar 28, 10:33 am, elkridge pinball wrote: Success, kind of!!!!! Resoldered bad connections, and replace 2 diodes that were shorted, plugged everything in and lights came on (at least the ones that are there !!!!! The lights do the flash to the music however, the are at half brightness and go full when I move the selector switch, but never flash. Where does the brown/black wires go? I see the shielded pair goes to the amp, but not sure on the other two??? Thanks kreed for the helpful inf!!! I haven't seen one of these boards for some years, but based on the typical setup rowe used for disco light control units in other models, there is an orange/black that is for mute (tells the lamp control that there is/isnt music playing and to go into the "attract mode" flash mode) . its earth return would appear to be via the mains ground (green/yel) or by the amp ground (via audio cable shield) The brown-black is typically used by Rowe in their other models as the +8vdc bus - direct from the power supply (before it gets to the on/off/ service switch assembly where it becomes a brown colour after the switch). if you mean a separate brown and black wire, the brown would likely be the switched +8vdc and the black would be a ground (negative) wire. This would simply provide power to the unit ? There should also be a pot to adjust the flash sensitivity. With a record playing, adjust this pot until the lights begin to flash to the beat of the music. If someone in the past has fiddled round with the unit, this pot has probably been altered too, stopping the lights from flashing to the beat properly Forgot to mention, all connections should be re soldered with a lead based solder (Don't use the politically correct lead free rubbish). Dry joints (particularly on backs of connectors) are a problem with all rowe solid state PCBs that I have ever seen. please double check all this info where possible before modifying anything or assuming anything is safe. If you want more exact answers, good resolution photos of the pcb (both sides) and outside of the unit showing the plug and wire colours will help enormously. These can be posted on a website and linked to here, or emailed direct to my email as attatchments. if you can post some detailed scans/pics of both sides of the board, and of the plugs, I can assist further Is the flash cicuit affected by the load on the circuit, many of the lamps are missing? I have ordered the proper colors but will not get them until Monday? I picked up some white 11 watt lamps just to test the circuits over the weekend. Thanks for all the great information. the load shouldnt matter. |
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