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Search: Posts Made By: cyclones
Forum: Troubleshooting Game Consoles & Other Weird Devices 11-17-2021, 07:22 PM
Replies: 30
Views: 3,472
Posted By cyclones
Re: Motor control board repair

Well, I found the problem causing no -15V. It's the connector. It's not making good contact, but I'm sure I accidentally bent that pin when I was originally trying to measure transformer output...
Forum: Troubleshooting Game Consoles & Other Weird Devices 11-17-2021, 06:30 PM
Replies: 30
Views: 3,472
Posted By cyclones
Re: Motor control board repair

I just connected my DC power supply to the middle pins of SR3 (where the AC is supposed to go) and supplied 20 volts and the -15V rail comes up.
Forum: Troubleshooting Game Consoles & Other Weird Devices 11-17-2021, 05:47 PM
Replies: 30
Views: 3,472
Posted By cyclones
Re: Motor control board repair

I tried it in the machine with everything connected and the -15V was missing.
Forum: Troubleshooting Game Consoles & Other Weird Devices 11-17-2021, 10:24 AM
Replies: 30
Views: 3,472
Posted By cyclones
Re: Motor control board repair

Yes, it does. I measured half an ohm (0.5 ohms) resistance on the traces. The letters and numbers on the apparent BR are LBA 63.
Forum: Troubleshooting Game Consoles & Other Weird Devices 11-12-2021, 07:45 PM
Replies: 30
Views: 3,472
Posted By cyclones
Re: Motor control board repair

Is it going to be safe to power up the board with 120VAC? That's about 10% higher than the 107V at the machine. I assume any voltage regulators should be able to handle that but just wanted to...
Forum: Troubleshooting Game Consoles & Other Weird Devices 11-11-2021, 11:08 PM
Replies: 30
Views: 3,472
Posted By cyclones
Re: Motor control board repair

It looks like the -15V goes back to SR3 and the voltage regulator that doesn't get warm, AVR2. From looking at the trace lines and from the meter, it seems like the AVR2 is in parallel. SR3 has a +...
Forum: Troubleshooting Game Consoles & Other Weird Devices 11-10-2021, 09:46 AM
Replies: 30
Views: 3,472
Posted By cyclones
Re: Motor control board repair

That was with the power supply. I finally got a chance to try the board in the machine and the input voltage was 107VAC.. not sure why it's 107V because that is just outside the typical 110-120VAC. ...
Forum: Troubleshooting Game Consoles & Other Weird Devices 11-01-2021, 03:42 PM
Replies: 30
Views: 3,472
Posted By cyclones
Re: Motor control board

I applied 120vac to the primary and here's I measured with green as ground:

grey one is 10V
blue one is 40V
purple is 2.25V
yellow is 5V
orange is .5V
Forum: Troubleshooting Game Consoles & Other Weird Devices 11-01-2021, 01:26 PM
Replies: 30
Views: 3,472
Posted By cyclones
Re: Motor control board

I'm going to check the linear input transformer by disconnecting it from the board and applying 120VAC to the primary windings and see what all the outputs are. If everything looks good there, I'll...
Forum: Troubleshooting Game Consoles & Other Weird Devices 10-31-2021, 10:14 PM
Replies: 30
Views: 3,472
Posted By cyclones
Re: Motor control board

What redwire says -- a bunch of dual diodes and transistors.
Forum: Troubleshooting Game Consoles & Other Weird Devices 10-31-2021, 10:12 PM
Replies: 30
Views: 3,472
Posted By cyclones
Re: Motor control board

I checked tonight in diode test mode between the AVR1 ground to the AVR2 ground and got a diode voltage drop -- about .595 volts.
Forum: Troubleshooting Game Consoles & Other Weird Devices 10-31-2021, 04:16 PM
Replies: 30
Views: 3,472
Posted By cyclones
Re: Motor control board

The two regulators which have heat sinks both have the following on them:
on the board they are labelled AVR1 and AVR2.

on the IC packages themselves, there is
3125p
6n27

on both. they...
Forum: Troubleshooting Game Consoles & Other Weird Devices 10-31-2021, 03:06 PM
Replies: 30
Views: 3,472
Posted By cyclones
Re: Motor control board

Here's a picture. There's a second board on the bottom that's almost entirely diodes and transistors. I checked all those with a meter and they seem good. I'll get a picture of the bottom board if...
Forum: Troubleshooting Game Consoles & Other Weird Devices 10-30-2021, 10:39 PM
Replies: 30
Views: 3,472
Posted By cyclones
Motor control board repair

I have a motor control board I am trying to repair. I've been told the motor is fine, but the control board will only make the motor go one direction but not the other. Power comes in through a...
Forum: Troubleshooting Power Supplies and Power Supply Design 12-11-2020, 11:50 PM
Replies: 1
Views: 608
Posted By cyclones
Switchmode PS caps

Hello,

I have been around this forum on and off for a number of years. In the last year I have really been working on my troubleshooting skills for electronics. I have repaired a car battery...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-05-2020, 02:48 PM
Replies: 0
Views: 478
Posted By cyclones
Toshiba blank screen, won't run without battery

Model is p745-s4320. I am looking at this for a friend. It came to me with a melted adapter plug. Not sure if this was caused by power fluctuations from the midwest derecho. I assumed there was...
Forum: Schematic Requests ONLY! 08-15-2020, 11:13 PM
Replies: 0
Views: 383
Posted By cyclones
Request for Toshiba P745-S4320

Working on this for a friend. Schematics appreciated.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-15-2020, 10:53 PM
Replies: 11
Views: 1,575
Posted By cyclones
Re: Macbook Pro 15" 820-2850-A No Power

Do all fuses pass a continuity check?
Forum: Troubleshooting Power Supplies and Power Supply Design 05-20-2012, 01:41 PM
Replies: 16
Views: 5,620
Posted By cyclones
Re: dead paper shredder with crap caps

I have not checked voltage on the electrolytic caps. I'm not too keen on working on this "live" without an isolation transformer or some other safety equipment. The electrolytics should be good as...
Forum: Troubleshooting Power Supplies and Power Supply Design 05-19-2012, 06:47 PM
Replies: 16
Views: 5,620
Posted By cyclones
Forum: Troubleshooting Power Supplies and Power Supply Design 05-19-2012, 04:27 PM
Replies: 16
Views: 5,620
Posted By cyclones
Re: dead paper shredder with crap caps

I will try to get better shots of the front and back of the board. In the meantime, I have checked the DZ on the front of the board and they all measure about 600-700 ohms in the forward direction...
Forum: Troubleshooting Power Supplies and Power Supply Design 05-14-2012, 08:01 PM
Replies: 16
Views: 5,620
Posted By cyclones
Re: dead paper shredder with crap caps

Here is a photo of the back side of the board. What spec of zener diodes will I need, assuming the diode(s) is/are the problem?
http://www.public.iastate.edu/~campbell/shredder/shredder_board.jpg
Forum: Troubleshooting Power Supplies and Power Supply Design 05-13-2012, 03:53 PM
Replies: 16
Views: 5,620
Posted By cyclones
Re: dead paper shredder with crap caps

Yes, I thought the diodes were probably performing the rectifier function. I tried getting continuity across DZ902 and can't seem to get anything either direction. The caps in the photo are new...
Forum: Troubleshooting Power Supplies and Power Supply Design 05-13-2012, 12:24 PM
Replies: 16
Views: 5,620
Posted By cyclones
Re: dead paper shredder with crap caps

Here is a photo of the board that I took. I did replace the crap caps with good ones but still the board appears dead. There is definitely continuity from the plug to the board.
...
Forum: Troubleshooting Power Supplies and Power Supply Design 11-27-2011, 04:06 PM
Replies: 16
Views: 5,620
Posted By cyclones
dead paper shredder with crap caps

I am trying to troubleshoot a dead paper shredder. It is a rather beefy looking thing from Staples. Big motor. It will not power up. None of the LEDs on the panel come on. I checked the simple...
Showing results 1 to 25 of 69

 
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