Organize and Share your Electronics the way you want. Sign-Up for a free account now. It takes only 30 seconds!

Repairing a Marconi Instruments 2955A Radio Communications Test Set, part 1

Repairing a Marconi Instruments 2955A Radio Communications Test Set, part 1

Mikko has written an article about Marconi 2955A repair:

First off, I decided to see what was the deal with the CRT. I have never worked on CRTs before, I have understanding of how the picture is formed by steering the electron beam using the deflection coils but that’s about it. I know a charged CRT can be deadly so I took my own safety very seriously. After carefully removing and inspecting the CRT drive board AC1, I noticed that someone had been there before. There were telltale signs everywhere. Screws missing, protective plastics missing, horrible soldering jobs… The CRT-to-chassis grounding strap appeared to be on but when I touched it ever so slightly, it just came off. I also noticed a TO-220 transistor (vertical deflection control) had apparently been changed by cutting off the leads from the old one and badly soldering a replacement on.

More details at Mikko’s blog.

Read more Here

 

More Articles to Read

Guide to build your 3.3v power supply
Guide to build your 3.3v power supply
SDR radio breathes life into a 75 year old Marconi CR100
SDR radio breathes life into a 75 year old Marconi CR100
A Time for Ranting!
A Time for Ranting!
Emulate a Commodore 64 keyboard with a modern PC and an Arduino
Emulate a Commodore 64 keyboard with a modern PC and an Arduino
USB2005 and USB97C202 Sharing ATA/ATAPI Drive w/ Another Controller
USB2005 and USB97C202 Sharing ATA/ATAPI Drive w/ Another Controller
Robotic Cat Laser
Robotic Cat Laser
LED traffic light
LED traffic light
Estimating Power for ADSP-BF561 Blackfin® Processors
Estimating Power for ADSP-BF561 Blackfin® Processors
Teach Your Arduino to Switch Itself Off!
Teach Your Arduino to Switch Itself Off!
Control a tracked robot with your mind (or joystick)
Control a tracked robot with your mind (or joystick)

Top




Shares