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HPA 2800 DB technologies defect |
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Jan-2T 
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Joined: 18 October 2024 Location: Belgium Status: Offline Points: 137 |
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 Topic: HPA 2800 DB technologies defectPosted: 28 April 2025 at 8:10pm |
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Hi all,
I just obtained a broken DB technologies amp, was told the power supply was defective... Anyone ever repaired a HPA-2800? Or someone can provide circuit diagrams?
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Music!
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Jan-2T
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Joined: 18 October 2024 Location: Belgium Status: Offline Points: 137 |
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Posted: 30 May 2025 at 9:09am |
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Started by fixing the power supply board, the soft-start's NTC s and one 100n ceramic capacitor were blown, replaced these and no problems with amp boards disconnected. Connected the wiring to A and B channels, fuse trips at startup. So found out one channel is shorting. B-channel's all five TTC5200 and TTA1943 are all shorted Would you replace the transistors on the other channel as well?  the pos. and neg. side's IXTP76N075T mosfets are shorted too (and one track burned off at the drain) and seem to be obsolete, but can be replaced One dual rectifier diode from +MID rail is gone as well. |
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EmPro
Young Croc 
Joined: 26 June 2020 Status: Offline Points: 992 |
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Posted: 01 June 2025 at 2:03pm |
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You're just wasteing your time with this sort of chinese craps,in order to do a proper repair you need to change: all drivers (even if they look good,the're not),all output transistors,all switching rails mosfets and the double diodes as well,only then you can have little bit of trust in it,if only one driver or output have the smallest problem you blew again 20 parts,so replaceing all the related parts with power suppy and output will fix it,not to mention that i found even the Op-Amp blown in one,however the supply zeneers were fine,i hate chinese craps!
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EmPro Audio
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Jan-2T
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Joined: 18 October 2024 Location: Belgium Status: Offline Points: 137 |
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Posted: 01 June 2025 at 9:19pm |
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I ordered all transistors, mosfets and diodes for both channels.
Never thought it was a chinese amp, both db and rcf have this model and are italian.
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EmPro
Young Croc
Joined: 26 June 2020 Status: Offline Points: 992 |
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Posted: 02 June 2025 at 7:33am |
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Yes,like T-Amp's,are German amplifiers because Thomann is German brand
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EmPro Audio
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Jan-2T
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Joined: 18 October 2024 Location: Belgium Status: Offline Points: 137 |
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Posted: 02 June 2025 at 8:10am |
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I may fix it and sell it... Should make a decent profit when it's working again. Then I'll look for a used crown/qsc/powersoft
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Music!
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EmPro
Young Croc
Joined: 26 June 2020 Status: Offline Points: 992 |
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Posted: 02 June 2025 at 8:22am |
The best thing you can do mate!!
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EmPro Audio
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kedwardsleisure
Old Croc 
Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 5157 |
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Posted: 02 June 2025 at 12:14pm |
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some of RCF/DBs 19in amps were made in India
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Kevin
North Staffordshire |
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Jan-2T
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Joined: 18 October 2024 Location: Belgium Status: Offline Points: 137 |
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Posted: 02 June 2025 at 12:56pm |
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Looked around and found a defective American Audio VLP-2500 These should be bulletproof (and also plenty power for my needs) buy it, fix it, use it?
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Music!
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EmPro
Young Croc
Joined: 26 June 2020 Status: Offline Points: 992 |
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Posted: 02 June 2025 at 1:15pm |
So....i see you are attracted to chinese craps
i still have one American Audio back home....sounds awful...bought long time ago as backup but it sounds so bad that i never use it in a sistem,it is a V1000.Edited by EmPro - 02 June 2025 at 1:20pm |
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EmPro Audio
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EmPro
Young Croc
Joined: 26 June 2020 Status: Offline Points: 992 |
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Posted: 02 June 2025 at 1:22pm |
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EmPro Audio
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EmPro
Young Croc
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Posted: 02 June 2025 at 1:24pm |
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All the parts from inside are Japanese,output Sanken etc,even the network filter is Jpanese as well...but it sounds nothing like a Japanese amplifier...it sounds so mud...lack of details....like you listen on a 1936 valve radio
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EmPro Audio
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Jan-2T wrote: