View Full Version : The Ampro shall rise again


tcerka
10-01-08, 10:07 PM
Hello AVS Forum,

I made a few posts at the end of 2002 trying to sell my pj, thankfully that never happened. I got it setup in my apartment during 2004 and it looked great on my 200 thread count 100% cotton screen. It only lasted for about a month before it died though. All the LEDs on the LVPS were bright, nothing smoked, popped, or sizzled, just no glow in the tubes. I knew that the HVPS had a bad rep and not being an EE I settled back into the eye straining world of a direct view tube. Four years down the road, the doctor told me to stop thinking about reality and get a hobby, my wife said sell it or fix it, so here I am.

Before I get started. I would like to thank Thurman, Chip, Curt, Ray, Troy, Bob, David, Allen, and all the other Gurus who have helped keep these machines running for so long.

The plates on the back label it as: Esprit/Ampro Model 69196, SN: E4000D13901, as well as Gretag Image Systems Model 69196 (4000D). Based mostly on the mounting of the registration board and the board underneath it, I wonder if the pj might be modified. What do you think? What is the board (that I wil rehang) hanging precariously underneath the registration board? Is it the Registration Amplifier Board?

Here is a list of the major components:

Gretag Hybrid Registration Board 65229 Rev X3
Gretag Registration Amplifier Board ? 65248 Rev A
Gretag Yoke Board (3) 65227 Rev A
Gretag 3000 Mother Board #1 65297 Rev X1
Gretag 3000 Mother Board #2 65301 Rev X
Gretag Test/Text Interface Board 65274 Rev X
Gretag 1535/1700/2000 RGB Board 65246 Rev A
Gretag CPU Board 65236 Rev A
Gretag 1700/2000 H.O.T. Board 65277 Rev X1
Gretag Quad Standard Decoder 65238 Rev A
Esprit Vertical Board 65298 Rev X1
Esprit Neck Board (3) 65302 Rev X1
Esprit 2000/4000 Horizontal Board 65245 Rev A
Sony SD146A Tubes

Ive pulled the HVPS, opened it up, and tested the diodes and resistors. Looks like the same three Rectifiers that went out on Chips 4600HD are bad on mine. In addition most of the resistors are bad. Thurman mentioned that NTE parts did not work well for him. Before I order replacements, any recomendations.

Tim

nashou66
10-01-08, 10:41 PM
Us Marquee guys have been swaping out any carbon comp resitors in our power supplies with Ohmite ceramic power resistors. They work great so far.
Also you may want to post this on Cuts new CRT forum.

http://www.curtpalme.com/forum/viewforum.php?f=1

Athanasios

stefuel
10-02-08, 06:52 AM
The first thing you should have done is fire it up and read the error messages on the remote. That's your best clue where to look for the problem. At this point, if you found anything smoked on the HVPS then go ahead and replace them first. Be carefull with the traces around the large resistors and diodes. They will be brittle and break off easy. Good luck.