CurtPalme.com Home Theater Forum

halcyon1234 · Joined: 21 May 2006 Posts: 39

My father-in-law's basement is done, and the Ampro's been ceiling mounted. I turned it on for the first time. None of the lenses come on, and I get Error 08 At 44. After a while it shuts down and shows "+20 Volt Failure".

I haven't had a chance to pop the hood (I was wiring up the sound system), but will be up at his place again over Christmas. I suspect something's come loose when it was flipped and mounted. Any hints as to where I should start prodding? Or will I be taking advantage of Curt's "$30 for anything" sale?

**Curt Palme** · Posted: Mon Dec 20, 2010 6:41 am Post subject:

First thing to check is the 20 volt fuse. They can blow for no reason and cause that. Otherwise it can be a CPU board or reggie board problem. Rare, but possible.

halcyon1234 · Joined: 21 May 2006 Posts: 39

Merry x-mas to all. =)

Checking it out now. The +20v fuse is good and not blown. I checked it manually, and the green LED on the power supply turn on.

The power supply fans turn on, but nothing else does. The two case fans don't spin, and the tubes don't come on.

The controller says both ERROR 08 AT 44 and ERROR 08 AT 46. It doesn't respond to any commands, and then after about 2 minutes shuts down the unit with the +20 error message (what a lie!)

I don't see any obvious loose or missing connections, but I'll keep trying. I'll try taking out the CPU and/or Reg board and try again.

stefuel · Posted: Sun Dec 26, 2010 4:28 pm Post subject:

Pull and re-seat the vertical board (44).
08 is a I2c error and 44 is the vertical board. Usually AmPro problems are resolved by solving the first error.
The vertical board is not communicating with the CPU.
46 is the focus modulator.

halcyon1234 · Joined: 21 May 2006 Posts: 39

halcyon1234 · Joined: 21 May 2006 Posts: 39

Read through the Ampro I2C Error guide posted on Curt's site. I'm getting error 08 (No Acknowledge from this device) for (seemingly at random):
40 CPU - Octal DAC
4A Horizontal - Octal DAC
44 Vertical - Octal DAC
46 Focus Mod - Octal DAC
48 Focus Mod - Octal DAC

So I guess the problem is with the Octal DAC. Not sure what that is.

I've tried unplugging and replugging everything I can get my hands on, reseated all the boards (except for the Horzontal Output board, because I can't figure out how to take it out).

I'm at a loss of what to do at this point. Anything else I can pull/reseat? Is there a module I need to buy from Curt and replace? Is this something a technician needs to come and fix?

Thanks for the guidance.

tse · Joined: 03 May 2006 Posts: 1014 Location: Sweatbucket, Fl.

If you can, get a DVM and measure the voltages on the fuses under the cover on the LVPS. Be careful not to short the probe tip to the chassis when it is on a fuse.

Often these problems on octal DACs and stuff are caused by improper LVPS outputs.

It will be a good idea to prevent the HV from coming up until you fix the unit. That will protect the CRTs from potential damage. Unplug projector from AC power and after a couple of minutes unplug P44A from the mother board and position somewhere safe from contact with chassis. P44A is a two wire connector coming from the HVPS.

Scott

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Funny thing is that DAC does not use +20v. I would also check the +5v and +12v lines.

Edit: Scratch that. the +20v is used to make the +12v. +9v makes +5v.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Hey. The schematic shows a switch on the vert board for table or ceiling but also says 2600. Does it apply to the 4600 vertical board?

papalek · Joined: 08 Mar 2006 Posts: 1536 Location: Longs SC

**Curt Palme** · Posted: Sun Jan 09, 2011 9:29 pm Post subject:

That switch is only on the 2000 series. It corrects geometry or something like that when inverting the image. THe actual deflection yoke changes are made with 2 pin connectors on the yoke on the 2000 series, and with inverting a PC board with changing board traces on it on the 3300, 3600 and 4600.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

It does say 2600 so I dont know.

halcyon1234 · Joined: 21 May 2006 Posts: 39

Found the problem!

I took out the LVPS to ship back to Curt, and lo and behold... there's a bent pin. I unbent it with some needlenoses, reseated everything-- and power!

I was a bit excited, and forgot to take a picture of the exact pin-- but if the PJ is ceiling mounted, and you were standing behind it looking up, it would be the bank of pins on the left, on the row further away from you, the second pin from the right (it might have been the third pin, damn memory).

I can only assume the LVPS shifted a bit when the PJ was being mounted.

Thanks for everyone's help!