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Crown Macrotech 5000-5002 IOC+SPI Bicolor led mod
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DjLeco View Drop Down
Young Croc
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    Posted: 26 August 2023 at 3:42pm
Hi my friends, longtime no seen here, I quitted in most part my activity, but always help colleagues with pleasure. 

As most of you knows about my EX Crown's 5000VZ that I owned, I have modified SPI-IOC led from green wich shows SPI signal and brighter green who shows IOC error (clipping) with bicolor led with common cathode green (SPI) and RED (IOC).

Originall acting:

https://www.youtube.com/watch?v=I2iPgeGvArU

Modified acting (observe on middle led (SPI+IOC):

https://www.youtube.com/watch?v=tO_26jekWUw

Here's the modification (made just for one channel in picture just to observe differences), all owners of crown 5000-5002VZ must modify channel 2 too as I have modified Ch 1 in attached picture.

Cheers mates!









Edited by DjLeco - 26 August 2023 at 3:54pm
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WaveLength View Drop Down
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Points: 40 		Post Options Post Options   Thanks (0) Thanks(0)   Quote WaveLength Quote  Post ReplyReply Direct Link To This Post Posted: 26 August 2023 at 7:26pm
Originally posted by DjLeco DjLeco wrote:

Hi my friends, longtime no seen here, I quitted in most part my activity, but always help colleagues with pleasure. 

As most of you knows about my EX Crown's 5000VZ that I owned, I have modified SPI-IOC led from green wich shows SPI signal and brighter green who shows IOC error (clipping) with bicolor led with common cathode green (SPI) and RED (IOC).

Originall acting:

https://www.youtube.com/watch?v=I2iPgeGvArU

Modified acting (observe on middle led (SPI+IOC):

https://www.youtube.com/watch?v=tO_26jekWUw

Here's the modification (made just for one channel in picture just to observe differences), all owners of crown 5000-5002VZ must modify channel 2 too as I have modified Ch 1 in attached picture.

Cheers mates!








Thx!!!!!!!👏👏👏👏👏👏👏👏👏
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DjLeco View Drop Down
Young Croc
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You're welcome!
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Old Croc
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Points: 5157 		Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 28 August 2023 at 8:57pm
There was a uk amp (PSL Ka series) that used bi-colour leds for signal/clip, I always thought they were difficult to notice especially when the clipping was very brief. No doubt Crown had a meeting to discuss the options on the clip / IOC lights and decided the dim-bright led would best serve people who were red-green colour blind, which is apparently the most common type. I can't say I've ever found the dim/bright green led to be an issue.
Kevin

North Staffordshire
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DjLeco View Drop Down
Young Croc
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Points: 820 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DjLeco Quote  Post ReplyReply Direct Link To This Post Posted: 28 August 2023 at 9:49pm
Is much hard to observe hard clipping when occurs, as led is fully bright on green.
If limiter on back side of the amp is not used (OFF), none speaker can survive if 5000 VZ is in hard clipping
In most cases red means stop or fault or not ok.
I think is much easier to observe red light appearing than green light brigher.



Edited by DjLeco - 28 August 2023 at 9:51pm
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Mantukau View Drop Down
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Hey djleco! I have problem with fans. Maybe can you help me out the problem? Its macro tech 5000vz. I see that you understand very good these 5000/5002vz amps. My fans start spining after 5 min but after 7mins they turns faster and faster and go noisy, but amplifier is at idle, with no speakers and no input.. outputs temperatures are cold.. I changed u712 moc3011 but still same.. 
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DjLeco View Drop Down
Young Croc
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Points: 820 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DjLeco Quote  Post ReplyReply Direct Link To This Post Posted: 18 November 2023 at 8:08am
Hi! Try to replace U707, U701, U713.

One of them could be directly soldered on PCB with no socket for fast replacing (so, I recommend to cut it each pins of integrated circuit with nailclipper or scissor pliers and desolder each pin separately, one by one as very tiny cooper traces, can be exfoiled.

Also replace U500 and U501 (thermal sensor LM334) wich are located on output devices heatsinks.

Check also Base and Emmiter pins of output devices to be good soldered on PCB, because most of them can be with small cracks, bad solders (and bad contact), or corrrosion (as in next pictures), where U can find/locate also, thermal sensor (in the midle of PCB of output devices heatsink). 



Of course, it must be changed all of above for both channels!

Good luck!
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Lorenzo Dynamix View Drop Down
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Points: 2 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Lorenzo Dynamix Quote  Post ReplyReply Direct Link To This Post Posted: 21 January 2025 at 8:51pm
Hi DjLeco,
I'm in trouble with channel 1 of my 5000vz. 
IOC led lights brigth when signal is over -10 dbu from mixer output. 
the sound out of the speaker seems to be ok. 
So Where do you think the problem is located?

Thank you
Lorenzo
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DjLeco View Drop Down
Young Croc
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Hi. 

First I need answer to a simple question: this pressumed fault was happened recently, or this is the way that amp behaves?

So: rotate both volume knobs to maximum clockwise, load amp with 8 or 4 ohms each ch, prefferably identical subwoofers. Insert mono ballanced signal to both channels using one Y adapter, and give it some signal.
Watch IOC led's, both must go to bright light in the same time for both channels when amp output is as max output capacity or distortion are greater than 0.05%.

Thell me how it is the result of this test, if one ch is go brighter led too earlier than other, or boths act almost the same.

Then we go further.


Edited by DjLeco - 28 January 2025 at 11:10am
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Lorenzo Dynamix View Drop Down
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Hi,
Thank you for fast reply, really appreciate. 

The fault was happened recently. 

I've already done the test with 2 identical subwoofers, mono signal and a Y-adapter cable on both input. 
The result is that only on channel-1 the IOC LED becomes brighter much earlier than other. 
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DjLeco View Drop Down
Young Croc
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Check in front of amp under air filters are 2 switches as in picture. With amp turned OFF, move all two switches couple times from left to right and vice versa to pass on all 4 positions (could have a bad contact), and asssure after this trick to be both in VZ ODEP mode.


After doing that, repeat the test described in my upper post and see if all is OK. If is the same (one ch is going brighter early than other), it looks to be a fault on VZ stage on that channel wich bright IOC led, early.
For that, amp needed advanced repair.

If you can, U must replace U703 circuit (NE555, LM555) for CH1, maybe this will solve problem. 

If not, try to replace U702 too (LM393).

And if not, the last one wich could be needed to be replaced is U705 (LM339).


I recommend to cut it each pins of integrated circuit with nailclipper or scissor pliers and desolder each pin separately, one by one as very tiny cooper traces, can be exfoiled!

Wait for news (good ones I hope), after doing what I said!
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