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Thread: 1995 Ez Path wiring in garage with RPC

  1. #21
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    Quote Originally Posted by Jim Dawson View Post
    That's about 1/2 amp so that is not blowing the fuses. Maybe try disconnecting all of the plugs from the AUF and connect the 24V feed. See if that blows fuses.
    Disconnected ALL the plugs going into that AUF board
    and still blew the fuses??
    What would this mean??
    There is aroud 26 VDC across the capacitor and going
    Into that board.



  2. #22
    Community Moderator Jim Dawson's Avatar
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    Default Re: 1995 Ez Path wiring in garage with RPC

    I think you have a short in the board. Maybe look for anything burnt or a metal chip laying across some traces or something.

    Jim Dawson
    Sandy, Oregon, USA


  3. #23
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    Quote Originally Posted by Jim Dawson View Post
    I think you have a short in the board. Maybe look for anything burnt or a metal chip laying across some traces or something.
    Will look more closely at board tommorow.
    Thanks again for all your advice.

    Cheers



  4. #24
    Community Moderator Jim Dawson's Avatar
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    Default Re: 1995 Ez Path wiring in garage with RPC

    I just had another thought. I think you said FU9 and FU10 were 6 amp fuses. Are you sure you are not installing 0.6 amp fuses? I made that mistake once.

    Jim Dawson
    Sandy, Oregon, USA


  5. #25
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    Quote Originally Posted by Jim Dawson View Post
    I just had another thought. I think you said FU9 and FU10 were 6 amp fuses. Are you sure you are not installing 0.6 amp fuses? I made that mistake once.
    Jim
    Double and triple checked that idea.
    Still blows.
    Are there any othee ideas?
    Just priced an AUF board - $1000 ouch!!



  6. #26
    Community Moderator Jim Dawson's Avatar
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    Default Re: 1995 Ez Path wiring in garage with RPC

    I think it's time to take a hard look at the AUF board, something is not right with it. A close inspection is in order.

    Jim Dawson
    Sandy, Oregon, USA


  7. #27
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    Quote Originally Posted by Jim Dawson View Post
    I think it's time to take a hard look at the AUF board, something is not right with it. A close inspection is in order.
    Ok I will.
    Is there somwthing that commonly burns up on these boards?



  8. #28
    Community Moderator Jim Dawson's Avatar
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    Default Re: 1995 Ez Path wiring in garage with RPC

    I wish I could tell you. I have never seen one. I would be looking for shorted diodes or something like that. Since you have 50 ohms across the 24V input terminals, I would be looking for something that turns on at power up. Maybe a relay or something.

    Jim Dawson
    Sandy, Oregon, USA


  9. #29
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    Quote Originally Posted by Jim Dawson View Post
    I wish I could tell you. I have never seen one. I would be looking for shorted diodes or something like that. Since you have 50 ohms across the 24V input terminals, I would be looking for something that turns on at power up. Maybe a relay or something.
    Jim

    The fuses blow even when nothing else attached to board except dc pwr??
    Do you think it could be the pwr supply itself?
    Maybe the different power from the rpc was enough
    to damage it?

    Is it possible for a pwr supply to put out dc voltage but still have a damaged bridge rectifier or capacitor?



  10. #30
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    Default Re: 1995 Ez Path wiring in garage with RPC

    Quote Originally Posted by RyGuy1 View Post
    Jim

    The fuses blow even when nothing else attached to board except dc pwr??
    Do you think it could be the pwr supply itself?
    It's possible, maybe one of the diodes in the bridge rectifier is bad. It's cheap to replace, about $5 or so. One that's rated 50V or higher will work fine.

    Maybe the different power from the rpc was enough
    to damage it?
    It could I suppose, but that would be pretty unusual.

    Is it possible for a pwr supply to put out dc voltage but still have a damaged bridge rectifier or capacitor?
    Maybe, I guess it would depend on exactly how the rectifier failed. The capacitor could be damaged by going way over voltage, but I can't figure out how that would affect FU9, maybe FU10 if the cap was shorted.

    On thing you could try is to connect two 12V light bulbs (tail light?) in series, and test the PS that way. That would tell you if the PS operates correctly under load.

    Jim Dawson
    Sandy, Oregon, USA


  11. #31
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    Quote Originally Posted by Jim Dawson View Post
    It's possible, maybe one of the diodes in the bridge rectifier is bad. It's cheap to replace, about $5 or so. One that's rated 50V or higher will work fine.



    It could I suppose, but that would be pretty unusual.



    Maybe, I guess it would depend on exactly how the rectifier failed. The capacitor could be damaged by going way over voltage, but I can't figure out how that would affect FU9, maybe FU10 if the cap was shorted.

    On thing you could try is to connect two 12V light bulbs (tail light?) in series, and test the PS that way. That would tell you if the PS operates correctly under load.

    Off to the garage!

    Light bulb idea sounds good.

    Thanks



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    Quote Originally Posted by RyGuy1 View Post
    Off to the garage!

    Light bulb idea sounds good.

    Thanks
    Light bulbs x2 in series
    Connected to dcv of psu
    Results is 1 of the bulbs lit up very dim.
    Shouldn't both of the bulbs have lit up much brighter?



  13. #33
    Community Moderator Jim Dawson's Avatar
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    Default Re: 1995 Ez Path wiring in garage with RPC

    Yes, I would have expected them both to light to normal brightness. Try that again, but measure the voltage across the bulbs or at the cap. You should see around 24 volts. If it's a lot less, maybe the bridge rectifier is bad.

    Jim Dawson
    Sandy, Oregon, USA


  14. #34
    Member john-100's Avatar
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    Default Re: 1995 Ez Path wiring in garage with RPC

    the bulbs have to be identical
    other wise one will heat up faster so most of the voltage is dropped across its filament
    and the other will remain cold and dark

    depending on the fuses used for FU9 & FU10
    it may be normal for a short circuit to blow both fuses

    do you have a link to a PDF manual with a schematic showing the connections to the AUF board ?
    a photo of the power supply and AUF board would be helpful


    having only worked on a bridgeport once to help a member trace a fault that was blowing fuses -
    with the aid of the schematic I had predicted 3 possible faults in advance including
    as it turned out a short between the armature of a servo motor and earth that proved to be the problem

    John

    PS
    I note both fuses are 6A so I would expect a short will blower both fuses

    PPS

    the only photo of a AFU board does not show enough detail
    1995 Ez Path wiring in garage with RPC-bridgeport-auf-board-2-jpg
    but I guess at the top leff is a 5V regulator for the logic devices

    top right 9 transistors for outputs
    and at the bottom of the board 4 solid state relays

    if you have two transistors connected as a totem pole output
    then only one can be on at a time other wise the supply will be short circuited

    one to switch the output to ground
    and the other to switch the output to the positive supply (+24V ?)



    the only part number that's just readable is the 70M-OAC5A solid state relay
    1995 Ez Path wiring in garage with RPC-70m-oac5a-jpg

    Last edited by john-100; 04-22-2018 at 12:45 PM. Reason: add PPS


  15. #35
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    Quote Originally Posted by john-100 View Post
    the bulbs have to be identical
    other wise one will heat up faster so most of the voltage is dropped across its filament
    and the other will remain cold and dark

    depending on the fuses used for FU9 & FU10
    it may be normal for a short circuit to blow both fuses

    do you have a link to a PDF manual with a schematic showing the connections to the AUF board ?
    a photo of the power supply and AUF board would be helpful


    having only worked on a bridgeport once to help a member trace a fault that was blowing fuses -
    with the aid of the schematic I had predicted 3 possible faults in advance including
    as it turned out a short between the armature of a servo motor and earth that proved to be the problem

    John

    PS
    I note both fuses are 6A so I would expect a short will blower both fuses

    PPS

    the only photo of a AFU board does not show enough detail
    1995 Ez Path wiring in garage with RPC-bridgeport-auf-board-2-jpg
    but I guess at the top leff is a 5V regulator for the logic devices

    top right 9 transistors for outputs
    and at the bottom of the board 4 solid state relays

    if you have two transistors connected as a totem pole output
    then only one can be on at a time other wise the supply will be short circuited

    one to switch the output to ground
    and the other to switch the output to the positive supply (+24V ?)



    the only part number that's just readable is the 70M-OAC5A solid state relay
    1995 Ez Path wiring in garage with RPC-70m-oac5a-jpg

    John,

    Yes, both bulbs were the same.

    Here is a schematic and 2 pics showing the power
    Supply and AUF board.

    Thanks

    Attached Thumbnails Attached Thumbnails 1995 Ez Path wiring in garage with RPC-20180422_113626-jpg   1995 Ez Path wiring in garage with RPC-20180417_184545-jpg   1995 Ez Path wiring in garage with RPC-20180417_184519-jpg  


  16. #36
    Member john-100's Avatar
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    Default Re: 1995 Ez Path wiring in garage with RPC

    looking at the power supply
    the capacitor looks in good condition
    the black rubber seal is OK and the grey vent plug in place and the blue plastic sleeve shows no sign the capacitor has over heated

    I can not read any more part numbers for the components on the AUF board

    what is the part numbers on the 9 devices I expected in post 34 could be 9 transistors connected to the output terminals ?

    assuming they are for open collector outputs to drive 24V relays or solenoids
    thing don't add up as I can only see 8 diodes next to the connectors

    I assume the voltage regulator U4 in your photo will be a "7805" regulator
    Fairchild for instance add a "LM" prefix so their part number will be LM7805

    with such a small heatsink I would not expect its supplying any thing near the 1A that a "7805" regulator can supply

    since it appears to be only supplying the 52 pin Motorola controller , 20 pin 74 series data buffer (74245 ?) and
    four 8 pin IC's that may be optp-isolators

    I assume the AC transformer connections 1 & 2 are connected to the four solid state relays


    john

    PS
    relay driver
    1995 Ez Path wiring in garage with RPC-relay-driver-circuit-jpg

    with some controller IC's they can limit the output current so you don't need a resistor between the IC output pin and the transistor base

    PPS

    to follow up the reference in post 34
    AdeV's bridgeport with the faulty servo motor can be found here

    https://www.cnczone.com/forums/bridg...ing-fuses.html
    by post 10 , I had worked out what needed to be tested,

    Last edited by john-100; 04-22-2018 at 05:24 PM. Reason: add PPS


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1995 Ez Path wiring in garage with RPC

1995 Ez Path wiring in garage with RPC