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Old 31st May 2014, 11:37 PM   #1
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Default Creek 4140 S2 schematic wanted

As per title says

Cheers
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Old 1st June 2014, 08:25 AM   #2
msdin is online now msdin  United Kingdom
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Quote:
Originally Posted by misfits73 View Post
As per title says

Cheers
Have you given Creek a call they are usually very helpful.
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Old 1st June 2014, 08:46 AM   #3
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AFAIK the only difference between the 4040 and the 4140 is the prior`s presence of bass/treble controls. I have the 4040 S2 schematic, if you want it, drop me a pm.
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Old 1st June 2014, 07:16 PM   #4
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Basically i'm looking for the idle current value
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Old 1st June 2014, 08:18 PM   #5
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Click the image to open in full size.
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Old 2nd June 2014, 07:53 PM   #6
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R19 & R20 are 0.22Ohms in 4040 S2 and there are 2 resistors of that type

In my 4140 S2 the value is 0.33ohms and 4 of them as seen in my previous attached photo (2 per channel i guess)

Looks more like the 4040 S3 :
http://audio.cyberkata.org/creek4040s3.jpg

Little confused in here as in the 4040 S2 schematic says voltage drop of 6mV across R19 or R20 which are 0.22Ohms, how much would be for 0.33Ohms?
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Old 26th June 2014, 06:42 PM   #7
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Creek replied and now I have some schematics.
3mV measuring in 1xemitter resistor or 6mV across both resistors.

The problem is different though, it's in the power supply circuit :
7915 voltage regulator is gone

The original part number is Motorola 7915C MC QQZE8948 but I don't know which new one to get in order to replace it.

Find below the schematic and photos of the +-15V regulators :

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.


Any ideas?
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Old 26th June 2014, 07:09 PM   #8
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ON Semi MC7915CTG would be about as close as you can get to the original.
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Old 26th June 2014, 07:29 PM   #9
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Should I change both?
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Old 27th June 2014, 01:07 AM   #10
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These are bog-standard 78xx/79xx series 1A regulators that been around longer than most people on the forum. You don't need to match them any more than their specified voltage and current ratings. If they are regulating properly (working), that's all you need. http://www.onsemi.com/pub_link/Collateral/MC7900-D.PDF
As you can see, the generic part number is simply 7915. C is commercial grade, T is T0220 package and G means lead-free tinned leads. the rest is batch/date codes.

What is much more important is to find out why the original part failed, which will be due to a short, overload of some sort downstream of the regulator in the preamp or other circuits associated. The load is usually very light on the -ve rail, nowhere near 1A. Has someone been poking around and accidentally shorted the negative 15V supply? If so, you could just put it down to inexperience if there are no further problems caused.
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