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Old 27th April 2009, 03:32 PM   #1
Robbo67 is offline Robbo67  Australia
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Question PowerSoft Q3002

Hi guys, Have been reading this forum for some time and I must say there is heap of good information to get off here.

I purchased a dead Q3002 Quad Class D amp off Ebay several months back. I believe it was used in a cinema since 2003 and never touched.
Once the lid was off, the service guys have removed both +/- 90V rail fuses and the two mains fuses. Have parts on order although they aren't anything special. The amp has failed due to its dead cooling fan which inturn caused virtually all 18 of th 1800uf 100V caps on the secondary side to dry out and leak eletrolyte. I have 100 on order from Panasonic (LowESR) and once they arrive, replace the caps one semiconductor and o/c resistor to see if she fires up. Start it off a variac of course.

Does anyone know what type of fuses these use? I would think fast acting ceramic 3AG or are they 3AG glass type?

In addition, would anybody have a schematic for this amp. Love to see the SMPS and PFC circuitry.

The layout looks good however, trying to fit 4 x PWM amps and powersupply into a 1RU box has made things fairly tight. Much appreciated if a schematic could be PM'd.

Let you know how it comes up once the caps arrive. Spares for others in similar circumstances.

Rob
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Old 28th April 2009, 10:54 AM   #2
Eva is offline Eva  Spain
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You will find that fast fuses are actually too fast to accept any overload at audio frequencies They were probably slow blow.

Could you post some pictures of the internals?
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Old 28th April 2009, 02:44 PM   #3
Robbo67 is offline Robbo67  Australia
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Eva,
No problems, I'll get some pics of the internals as the amplifier modules are modular in design and are very well made.

I've used one of these amps before a couple of years back and was impressed with its power for size however, cost over $4000 AUD at the time. Stick to lugging my Yahama 2002 around to gigs.
I have 2 x QSC PLX3602 now and these use SMPS with Class H output stage. Nice and light on the back.

These are the output specs on the Q3002 from the user manual.

All channels working
(1KHz, 1% THD)
750W into 2 Ohm
400W into 4 Ohm
250W into 8 Ohm per channel

1500W into 4 Ohms BTL
800W into 8 Ohm BTL


Power supply looks like a half bridge design with PFC on the front end. 900VA avg uses Unitrode IC's for both PFC and SMPS drive. No SG3525A in these.


I'll take some snaps of the PWM modules and the SMPS and put up on the forum after work.

Rob
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Old 29th April 2009, 03:56 AM   #4
Robbo67 is offline Robbo67  Australia
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Default Pictures of internals.

Eva,
Find attached zipped jpegs of internal of my Q3002.
The file is 4Meg in size after knocking the res down to several hundred K from 5-6Meg per pic.

Fuses where missing when I received it. Fuse ratings are on the PWM modules however, not sure if they are fast acting or slowblow and if they are the standard 3AG glass type or the ceramic quicksorb.

Your experience suggests that a slow blow type is recommended for the PWM modules. Fast acting for the SMPS?

Remember, I have removed all the secondary side caps as they are had it. I have also removed the drive heastsink block.

I have placed the buggered fan back into the chassis to show how its all pack in to a single rack unit. Very light.

Anyway, take a look and let me know.

Questions are welcome.

Rob
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Old 29th April 2009, 03:03 PM   #5
Robbo67 is offline Robbo67  Australia
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I have attached zip file however, since I'm a new member I'm under mod. Looks like the zip didn't come through possible due to the same thing. Untrusted.

Eva, if you could send me your email address, I'll send them directly to you.
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Old 29th April 2009, 03:05 PM   #6
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Robbo67
If you you would please send to avcadmaster@hotmail.com I will post them all here so we all can enjoy them.
Thanks!
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Old 29th April 2009, 04:55 PM   #7
Eva is offline Eva  Spain
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You can send it to the messenger address on my profile
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Old 30th April 2009, 04:40 AM   #8
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Thanks Robbo67!
I will post the pictures tomorrow when I get to work.
Cheers!
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Old 30th April 2009, 03:07 PM   #9
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Thumbs up PICS FROM ROBBO67

Quote:
FRONT PANEL
Click the image to open in full size.

Quote:
FUSE RATINGS
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Quote:
MISSING MAIN FUSES
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Quote:
MAINS INPUT FILTER
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Quote:
PWM MODULE - LOWER SECTION
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Quote:
PWM MODULE PIGGYBACK
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Quote:
STEREO MODULE
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Quote:
PWM DRIVER PCB
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Quote:
SMPS BR DRIVER PFC
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Quote:
SMPS CONTROL CLOCK
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Quote:
SMPS CONTROL PFC
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Quote:
SMPS CONTROL UC3842 DRIVER
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Quote:
SMPS CONTROL UC3842
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Quote:
SMPS MAIN TRANSFORMERS
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Quote:
SMPS - NO HEATSINK - CAPS
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Quote:
SMPS - SEC DIODES - FAN DRIVER
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Old 1st May 2009, 02:52 PM   #10
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Robbo67 if you have a service manual for this amp can you send me то my mail: switchlab@gmail.com. Thanks
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