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Forum: Troubleshooting Power Supplies and Power Supply Design

01-12-2022, 07:11 PM

Replies: 25

Need some help with Epson Printer Power Supply C655 MAIN

Views: 1,355

Posted By UglyBetty

Re: Need some help with Epson Printer Power Supply C655 MAIN

Waiting on parts. When I get them, I'll update this thread more.
Estimated delivery date 1/21 - 2/4........

:bored: :bored: :bored:

Forum: General Electronics Technical Discussion

01-10-2022, 02:36 PM

Replies: 21

Neighbor has a constant drain on his car battery...

Views: 1,461

Posted By UglyBetty

Re: Neighbor has a constant drain on his car battery...

Your correct, Acura is Honda....not Toyota. My mistake. Everything else still applies.

Forum: General Electronics Technical Discussion

01-10-2022, 09:36 AM

Replies: 21

Neighbor has a constant drain on his car battery...

Views: 1,461

Posted By UglyBetty

Re: Neighbor has a constant drain on his car battery...

Here is something else. Just because the alternator "appears" to be charging at the correct voltage, does not necessarily mean the alternator is good. There are 4 huge diodes inside the alt. They can...

Forum: Troubleshooting Power Supplies and Power Supply Design

01-09-2022, 04:37 PM

Replies: 25

Need some help with Epson Printer Power Supply C655 MAIN

Views: 1,355

Posted By UglyBetty

Re: Need some help with Epson Printer Power Supply C655 MAIN

CapLeaker,
I traced the schematic back from the +42v connection to the printhead. I was not able to find a schematic for the printhead itself, but did determine which connection was the input for...

Forum: Troubleshooting Power Supplies and Power Supply Design

01-09-2022, 10:12 AM

Replies: 25

Need some help with Epson Printer Power Supply C655 MAIN

Views: 1,355

Posted By UglyBetty

Re: Need some help with Epson Printer Power Supply C655 MAIN

Just for the heck of it, I ordered some transistors to see if I can screw up this board even more! This should be fun! Stay tuned....

Forum: General Capacitor Questions & Issues

01-08-2022, 02:00 PM

Replies: 1,015

Sticky: The Hall of Shame - Badcaps Photo Montage

Views: 523,688

Posted By UglyBetty

Re: The Hall of Shame - Badcaps Photo Montage

Okay, here is my contribution. A few years ago I used a Motorola power supply that was from a retires base-station police band radio. I used it to build a 20amp power supply to run some of my radio...

Forum: Troubleshooting Power Supplies and Power Supply Design

01-08-2022, 01:46 PM

Replies: 25

Need some help with Epson Printer Power Supply C655 MAIN

Views: 1,355

Posted By UglyBetty

Re: Need some help with Epson Printer Power Supply C655 MAIN

Thanks EVERYONE for your help! You guys/gals are awesome! I'm going to call this one for now. I'll post an update when I get the "stuff" in and get it going again.

Forum: Troubleshooting Power Supplies and Power Supply Design

01-08-2022, 01:44 PM

Replies: 25

Need some help with Epson Printer Power Supply C655 MAIN

Views: 1,355

Posted By UglyBetty

Re: Need some help with Epson Printer Power Supply C655 MAIN

I wondered that myself. I numbered all of the small ribbon cables I removed from the main board to the rest of the printer. then I photographed them as I was removing them. The way the cables lay in...

Forum: Troubleshooting Power Supplies and Power Supply Design

01-08-2022, 12:54 PM

Replies: 25

Need some help with Epson Printer Power Supply C655 MAIN

Views: 1,355

Posted By UglyBetty

Re: Need some help with Epson Printer Power Supply.

C12 is a 250v cap., not 25v.
Yes, I measured a short of 0.3 ohms across the +42 volt supply connections and ground.

Edit; Sorry, you are correct, I was thinking C11, not C12. Your right, it is...

Forum: Troubleshooting Power Supplies and Power Supply Design

01-08-2022, 12:51 PM

Replies: 25

Need some help with Epson Printer Power Supply C655 MAIN

Views: 1,355

Posted By UglyBetty

Re: Need some help with Epson Printer Power Supply C655 MAIN

I'll see if I can find something with the same specs, replace them and see if I can make it work.
I checked the R164. In circuit, it measures 2.4 ohms, going through that resister, through C129,...

Forum: Troubleshooting Power Supplies and Power Supply Design

01-08-2022, 09:54 AM

Replies: 25

Need some help with Epson Printer Power Supply C655 MAIN

Views: 1,355

Posted By UglyBetty

Re: Need some help with Epson Printer Power Supply C655 MAIN

Something else fun! I put it all back together, minus the transistors, jumper GRD and PSC, I get my +43v, +5v and +3.3v back from the power supply!! Guess the transistors were the short...
What do...

Forum: Troubleshooting Power Supplies and Power Supply Design

01-08-2022, 09:34 AM

Replies: 25

Need some help with Epson Printer Power Supply C655 MAIN

Views: 1,355

Posted By UglyBetty

Re: Need some help with Epson Printer Power Supply C655 MAIN

This was driving me crazy last night so I did some more digging. I just couldn't walk away from it. I'm a seasoned professional mechanic for a living and I know the importance of proper diagnosis. I...

Forum: Troubleshooting Power Supplies and Power Supply Design

01-07-2022, 08:02 PM

Replies: 25

Need some help with Epson Printer Power Supply C655 MAIN

Views: 1,355

Posted By UglyBetty

Re: Need some help with Epson Printer Power Supply.

On C12, I just measured across the leads of the cap.

I disconnected the power supply from the main board and measured the ohm value across the +42 volt terminal and to the one of the ground...

Forum: Troubleshooting Power Supplies and Power Supply Design

01-07-2022, 07:17 PM

Replies: 25

Need some help with Epson Printer Power Supply C655 MAIN

Views: 1,355

Posted By UglyBetty

Re: Need some help with Epson Printer Power Supply.

Voltage across C51/C52 is 0volts, but it pulses up to between 1-3 when the supply comes on, immediately drops to 0 volts when the supply kicks back off.

Voltage across C-12 is a steady 165.

I...

Forum: Troubleshooting Power Supplies and Power Supply Design

01-07-2022, 10:27 AM

Replies: 25

Need some help with Epson Printer Power Supply C655 MAIN

Views: 1,355

Posted By UglyBetty

Re: Need some help with Epson Printer Power Supply.

Thanks CapLeaker.
If you look at the schematic, on the output side, connector CN2, pin 5 of that connector is labeled "PSC". If I'm not mistaken, that stands for Power Supply Control. Studying the...

Forum: Troubleshooting Power Supplies and Power Supply Design

01-07-2022, 08:00 AM

Replies: 16

Help diagnosing PWO1025 SMPS

Views: 1,132

Posted By UglyBetty

Re: Help diagnosing PWO1025 SMPS

Great to hear you had a positive outcome. I need to learn more about zener diodes.

Forum: Troubleshooting Power Supplies and Power Supply Design

01-06-2022, 08:52 PM

Replies: 25

Need some help with Epson Printer Power Supply C655 MAIN

Views: 1,355

Posted By UglyBetty

Re: Need some help with Epson Printer Power Supply.

R_J ---Thanks so much for your reply.

I have measured other sub-ohm resistors and the leads did not add this much resistance (if any). I'm using a Fluke DVOM meter and meter leads. Leads touched...

Forum: Troubleshooting Power Supplies and Power Supply Design

01-06-2022, 03:54 PM

Replies: 25

Need some help with Epson Printer Power Supply C655 MAIN

Views: 1,355

Posted By UglyBetty

Need some help with Epson Printer Power Supply C655 MAIN

Here is the back story. This printer had been sitting for about two years not used. I removed the print head to clean it (completely dried out). I cleaned it and reinstalled in. Powered the printer...

Forum: Announcements & Related News

01-06-2022, 01:39 PM

Replies: 30,105

Sticky: New Members - please post your introductions here

Views: 3,010,706

Posted By UglyBetty

Re: New Members - please post your introductions here

Saying hello....50 something Amateur Radio operator and Jeep Junkie in Oklahoma. Here to get some help with a power supply for my beloved large-format printer, and to learn all I can from the people...

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