Init Paper Shredder sensor circuit
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Re: Init Paper Shredder sensor circuit
lol, I am reminded how much of a headache I get trying to trace circuits from random pics. Can you trace the circuit back a bit and with power off, measure resistance with the slide switch flipped one way, then the other? Looking at the switch contacts as two columns in the picture of the back of the PCB, the first two rows of contacts in each column should read very near zero resistance between each other when the switch is flipped that direction, and vice versa for when the switch is flipped the other direction.Comment
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Re: Init Paper Shredder sensor circuit
That is common function for shredder, my has the same but it uses micro switch for sensing paper.
Any how, you are reading only 57VAC on the brush connections? They may have the Stator and the rotor winding in series setup.
That is why good clear pictures are important when you do not have the board right in front of you.Last edited by budm; 06-12-2012, 07:29 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Init Paper Shredder sensor circuit
lol, I am reminded how much of a headache I get trying to trace circuits from random pics. Can you trace the circuit back a bit and with power off, measure resistance with the slide switch flipped one way, then the other? Looking at the switch contacts as two columns in the picture of the back of the PCB, the first two rows of contacts in each column should read very near zero resistance between each other when the switch is flipped that direction, and vice versa for when the switch is flipped the other direction.Comment
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Re: Init Paper Shredder sensor circuit
Does the motor run the same speed in both direction? If it does, then that will eliminate the contact resistance problem.
When the slide switch is in the left position (base on the picture with numbers)
1 and 2 should be 0 ohm.
5 and 6 should be 0 Ohm
when move it all the way to the right position
3 and 4 should be 0 Ohm
7 and 8 should be 0 OhmNever stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Init Paper Shredder sensor circuit
Does the motor run the same speed in both direction? If it does, then that will eliminate the contact resistance problem.
When the slide switch is in the left position (base on the picture with numbers)
1 and 2 should be 0 ohm.
5 and 6 should be 0 Ohm
when move it all the way to the right position
3 and 4 should be 0 Ohm
7 and 8 should be 0 OhmLast edited by davg; 06-13-2012, 05:27 AM.Comment
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Re: Init Paper Shredder sensor circuit
When you say the motor runs slow what are you comparing it with?.
How long does it take to shred a sheet?Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Comment
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Re: Init Paper Shredder sensor circuit
ok i believe normal max is about 3meters per minute. Is there any detail on the motor that might help us find the specs for it?Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: Init Paper Shredder sensor circuit
Can you remove the motor from the assembly so you can run it without the load, and since it uses the gear reduction to run the shredder assembly, can you crank the assembly by hand using the same gear that the motor is attached to just to find out how hard it is to move the blades.
I believe the stator and the rotor windings are connected in series, and they reverse the direction by switching either the stator or rotor winding connection.
I still do have the time to draw up the wiring diagram yet.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Init Paper Shredder sensor circuit
He could also check voltage across a different combo of wires going to the motor to see if any combo is at ~ 120VAC. Since the cutters turn ok with the gear removed it seems as though either not enough voltage is getting to the motor or it has a short in the windings.
OR what I mentioned earlier, that the blades are really dull and it's choking on the paper which would make it run significantly faster with a narrow piece of paper vs a full width piece.Last edited by 999999999; 06-13-2012, 12:55 PM.Comment
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Re: Init Paper Shredder sensor circuit
Good suggestion, 9999999.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Init Paper Shredder sensor circuit
He could also check voltage across a different combo of wires going to the motor to see if any combo is at ~ 120VAC. Since the cutters turn ok with the gear removed it seems as though either not enough voltage is getting to the motor or it has a short in the windings.
OR what I mentioned earlier, that the blades are really dull and it's choking on the paper which would make it run significantly faster with a narrow piece of paper vs a full width piece.Comment
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Re: Init Paper Shredder sensor circuit
I am beginning to think the same as 99999 that the motor may have shorted turn in the windings.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Init Paper Shredder sensor circuit
By the way, that big white power resistor 0.6 Ohm is in series with the motor, can you check and see if it read less than 1 Ohm?Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Init Paper Shredder sensor circuit
OK, I figured out how it works, see simplified diagram attached.
The Rotor winding is connected in series with Stator winding, depend on how you connect them together, you can make it run forward or backward by reversing the Rotor winding connection, very simple, as long as the two windings are in series, the motor will run.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Init Paper Shredder sensor circuit
Have we mentioned checking the brushes are not too worn or are the slides clogged with dust so the brushes are not seating correctly. When it is running are there a lot of sparks from the commutator, I recall you did say you had cleaned the gaps.Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: Init Paper Shredder sensor circuit
OK, I figured out how it works, see simplified diagram attached.
The Rotor winding is connected in series with Stator winding, depend on how you connect them together, you can make it run forward or backward by reversing the Rotor winding connection, very simple, as long as the two windings are in series, the motor will run.Comment
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Re: Init Paper Shredder sensor circuit
Well at least you know how it is wired up now, I thought you had check the brushes in post 9 and indicating that they were OK. Live and learn.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Init Paper Shredder sensor circuit
Thanks again and yes I did check but I only removed the one on top easy to get at?? (making to many assumptions) your are right "live and learn". That drawing is a useful thing to have around.Comment
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