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LBSmidtfyn
Joined: 01 Dec 2016
Posts: 35
Location: DK
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| Posted: Sat Dec 03, 2016 10:25 am Post subject: Ampro 3600 fried? |
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G2 wires partly melted to the metal. Jumper10 multiwire a bit flossy. Fuse f4 blown. When fuse replaced, it fires up, light the tubes, stays on with full tubelight for 2 sec, then shuts down. Heading to the dumpster?
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LBSmidtfyn
Joined: 01 Dec 2016
Posts: 35
Location: DK
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| Posted: Sat Dec 03, 2016 4:01 pm Post subject: |
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Happened when i tryed to turn the red tube to align with the green. the back of the crt-tube touched a heatsink, and the thing shorted..
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Sat Dec 03, 2016 5:07 pm Post subject: |
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Shouldn't be hard to fix. Your tubes are being driven too hard, then the HV shuts down to protect the tubes. I'm out of town for the weekend, but can check the service manual next week and see if I have boards in stock.
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LBSmidtfyn
Joined: 01 Dec 2016
Posts: 35
Location: DK
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| Posted: Sun Dec 04, 2016 2:42 am Post subject: |
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Thanx:)
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LBSmidtfyn
Joined: 01 Dec 2016
Posts: 35
Location: DK
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| Posted: Sun Dec 04, 2016 5:04 pm Post subject: |
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Do you know if there are any interchangeable parts between the 3600 & the 4200?
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Sun Dec 04, 2016 5:07 pm Post subject: |
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I don't think there's any, sorry!
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cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
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| Posted: Sun Dec 04, 2016 9:23 pm Post subject: |
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Find Tse on this forum (member search) and send him a PM. He probably knows as much as anybody alive
(or dead) about AmPros since he helped create them.
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Mon Dec 05, 2016 1:13 am Post subject: |
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| cmjohnson wrote: | Find Tse on this forum (member search) and send him a PM. He probably knows as much as anybody alive
(or dead) about AmPros since he helped create them. |
Tse helped me get my Ampro 4000 going when it looked like it wouldn't run again. He's super good with Ampros.
_________________
Tech support for nothing
CRT.
HD done right!
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LBSmidtfyn
Joined: 01 Dec 2016
Posts: 35
Location: DK
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| Posted: Mon Dec 05, 2016 8:28 am Post subject: |
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Waiting for Curt to see if he has a solution. Then i look up TSE as suggested.
What a nice forum this is. Thankyou for helping me and everyone out👍
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LBSmidtfyn
Joined: 01 Dec 2016
Posts: 35
Location: DK
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| Posted: Mon Dec 05, 2016 8:32 am Post subject: |
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Tse's last visit to the forum was 5 months ago?
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LBSmidtfyn
Joined: 01 Dec 2016
Posts: 35
Location: DK
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Tue Dec 06, 2016 2:39 pm Post subject: |
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OK, I'll get to the service manual today. Strange that the G2 wire would crumble like that. I'd definitely replace it right from under the motherboard.
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LBSmidtfyn
Joined: 01 Dec 2016
Posts: 35
Location: DK
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| Posted: Tue Dec 06, 2016 3:06 pm Post subject: |
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Yeah, and all three G2 wires looks like that.
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Tue Dec 06, 2016 3:19 pm Post subject: |
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What I would do to start is measure the G2 voltage. It should be somewhere between 400-800 volts DC. Let me know where that's at.
ALso you can try to unplug two of the three CRT sockets, so that only one tube is connected. See if you can get one or two tubes to work. A shorted CRT socket/video amp can cause the problem you're seeing.
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LBSmidtfyn
Joined: 01 Dec 2016
Posts: 35
Location: DK
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| Posted: Tue Dec 06, 2016 3:41 pm Post subject: |
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I'm not sure how to do that. G2 voltage measure by +probe on G2-wire and -probe on chassis? How do I unplug CRT sockets?
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Tue Dec 06, 2016 3:48 pm Post subject: |
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Correct on the G2 measurement. Disconnect the G2 lead, and there's two wiring harnesses on each CRT board that go to multipin connectors. Unplug those at the CRT socket to disconnect the tube from the circuit.
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LBSmidtfyn
Joined: 01 Dec 2016
Posts: 35
Location: DK
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| Posted: Tue Dec 06, 2016 4:17 pm Post subject: |
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With only green crt plugged same result. But meter reads 972 Volt....
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LBSmidtfyn
Joined: 01 Dec 2016
Posts: 35
Location: DK
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| Posted: Tue Dec 06, 2016 4:18 pm Post subject: |
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Very bright green though:)
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Tue Dec 06, 2016 5:45 pm Post subject: |
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OK, there's your problem, that's way too high for the G2! I therefore suspect a problem in the HVPS. I need the X part number, and the 4 digits after that, could be X2102 or X3394, etc.
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LBSmidtfyn
Joined: 01 Dec 2016
Posts: 35
Location: DK
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| Posted: Tue Dec 06, 2016 5:50 pm Post subject: |
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X2394
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