CurtPalme.com Home Theater Forum

[matttodd]

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My daughter turned on the Ampro 3600 this afternoon, and the blue tube wouldn't go on. Not sure if it's related to that or not, but I punched in the "30 code" to check diagnostics and got a "+40 low" error message. I've tried cutting off the blue CRT and cutting it back on again, but still nothing from it. Everything is yellow - as the green and red are working fine. Any suggestions on what the issue might be?

Matt

[macgyver655]

There should be a row of green leds on the LVPS. Are they all on?

[matttodd]

Thanks Macgyver566. I pulled the cover, and all green LEDs are lit, except the one labeled -40. Curt also suggested I switch the CRT amplifier card, so I pulled it off the blue tube, and switched it with another. I'm getting some output from the blue tube when I do that - it's just very dim. I didn't try to mess with the G2 yet or anything else.

Any suggestions?

[macgyver655]

If the LED on the P/S is not lit then you need to remove the fuse cover and check the fuses. I would think this needs to be addressed first. When you switched the CRT cards what did the other tube do that you put the blue card on?

[Curt Palme]

Sounds like two different problems. Make sure the black 2 pin video connector is on the right way. If it's backwards, you'll get a dim negative picture.

Put a new fuse into the -40 volt holder. If it blows again, you'll need to disconnect the convergence output board, replace the fuse again and see if it blows. I've had a few Ampros short out the -40 volt line, I'll have to grab the service manual to see what boards it feeds. I still have good stock of ampro boards.

[Curt Palme]

Sounds like two different problems. Make sure the black 2 pin video connector is on the right way. If it's backwards, you'll get a dim negative picture.

Put a new fuse into the -40 volt holder. If it blows again, you'll need to disconnect the convergence output board, replace the fuse again and see if it blows. I've had a few Ampros short out the -40 volt line, I'll have to grab the service manual to see what boards it feeds. I still have good stock of ampro boards.

[macgyver655]

[matttodd]

Thanks for the tips guys - I was able to pull the fuse cover, and replace the +40V fuse with one from my parts machine. That solved that problem. Once I got that solved, I flipped the video input 2-pin wire to the CRT amplifier card (tried it both ways), just to make sure I had it right. It was still dim, even when right, although I found by chance when I bumped the G2 setting, sometimes I could get it to come on with full intensity, instead of being dim, so for now, everything seems to be working. I'm not sure what the issue was/is with the dim output on blue, but at least it seems okay for now.

Matt