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Pioneer Cassette Player CT-F-7171

Discussion in 'Tape' started by StanleyM, Feb 11, 2018.

  1. StanleyM

    StanleyM New Member

    Messages:
    26
    Location:
    N.C.
    I picked up aPioneer Cassette Deck, model CT-F7171 along with some other units for a 100 bucks including a Dual 1229Q Turntable. The belts are shot on the deck so I took it apart and used some rubber bands just to see if it would play. Now it keeps blowing the motor fuse, I could get it to play and FF but that is it. Did I put it back together wrong? Any help is welcomed!!
     

     

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  2. inductor

    inductor Super Member

    Messages:
    1,576
    Location:
    uk
    never had a problem with fuse blowing with a 7171, must be something unusual, dont remember there being a fuse to the motor ?
     
  3. StanleyM

    StanleyM New Member

    Messages:
    26
    Location:
    N.C.
    If you open it up there is a bank of 4 fuses, there is a 1 amp, 2 ea. .500 amp and the one for the motor is .800 or .850 amps. As soon as I cut the power on it blows. I checked the fuse to ground and it was OL. Thanks for replying I would really like to get this unit up and running.
     
  4. inductor

    inductor Super Member

    Messages:
    1,576
    Location:
    uk
    thats not shown in the service manual i have, anyhoo, motor is probably goosed, did you mean it blows when you switch it off ?, had another look at the manual and yes it was lurking furtively, (me mistook)
     
    Last edited: Feb 12, 2018
  5. StanleyM

    StanleyM New Member

    Messages:
    26
    Location:
    N.C.
    No blows fuse when power is turned on. I don't believe the motor gets power due the fuse blowing before I can push Play FF or Rewind.
     
  6. inductor

    inductor Super Member

    Messages:
    1,576
    Location:
    uk
    check the diodes and capacitor for shorts, and\or disconnect the motor and see if it still blows
     

     

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  7. StanleyM

    StanleyM New Member

    Messages:
    26
    Location:
    N.C.
    on the power supply?
     
  8. StanleyM

    StanleyM New Member

    Messages:
    26
    Location:
    N.C.
    Ok I will let you know my findings, maybe I will get lucky and see the obvious problem. Thanks for your help!!
     
  9. inductor

    inductor Super Member

    Messages:
    1,576
    Location:
    uk
    yes the psu
     
  10. StanleyM

    StanleyM New Member

    Messages:
    26
    Location:
    N.C.
    OK took a look at this circuit looks like it could be a diode or cap now I just have to locate this circuit.
    upload_2018-2-15_7-57-6.png
     
  11. inductor

    inductor Super Member

    Messages:
    1,576
    Location:
    uk
    the psu is the small board to the back of the chassis if i remember correct
     

     

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  12. StanleyM

    StanleyM New Member

    Messages:
    26
    Location:
    N.C.
    Ok, thanks!! I will check it out when I get home this afternoon. Thanks again for all your help!! I have several old Pioneer Receiver's, have you ever repaired any?
     
  13. inductor

    inductor Super Member

    Messages:
    1,576
    Location:
    uk
    have i ? lost count but then i wasnt counting
     
  14. StanleyM

    StanleyM New Member

    Messages:
    26
    Location:
    N.C.
    Good one!! So I found the short in the player, when I installed rubber bands on the spindles I put the play switch on the wrong side of the switch actuator shorting out the switch. I picked the player unit it up put on the other side and walla I turned the power on and the fuse did not blow even pushed play and the motor turned. Now I have a bigger issue I removed the dolby processor board while hunting for he psu. Once you told me where to look I was securing the dolby board back down and cracked a glass resistor I guess is what it is. I took a close up pic of it and was going to post but my phone died. It is located on the right channel. I tried to find the number for the component it but no luck. I am gonna get my loop out and look at the board and see if I can see a number for the component in question. I know I have thanked you for your help but I would like to thank you again. Answering peoples questions takes time so I am grateful.
     
  15. StanleyM

    StanleyM New Member

    Messages:
    26
    Location:
    N.C.
    OK got a pic of the component that I broke this pic is from the left side, I would imagine the right is exactly the same Dolby Processor
     

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  16. inductor

    inductor Super Member

    Messages:
    1,576
    Location:
    uk
    thats a diode
     

     

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  17. StanleyM

    StanleyM New Member

    Messages:
    26
    Location:
    N.C.
    Thanks, never seen one like that before, I should be able to put a meter across read the value and order one? Or does it have to be glass for a reason?
     
  18. inductor

    inductor Super Member

    Messages:
    1,576
    Location:
    uk
    if you can 'measure' the diode values ? eh, might get more idea in your other post
     
  19. inductor

    inductor Super Member

    Messages:
    1,576
    Location:
    uk
    a 1n4148 should do, are you sure its that one the picture looks like a germanium signal diode
     
  20. StanleyM

    StanleyM New Member

    Messages:
    26
    Location:
    N.C.
    It could be, I have tried to trace it down to where It's location is. I have tried to look for some type of writing on it. I took the broke one out that was on the right channel then took the left one out on the left channel they are the same but no numbers or writing on them.
     

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