ARCAM Black Box 50

jonclancy · 10th April 2004, 11:24 PM

Hi,

as some may know, my BB50 has died on one channel (after misbehaving and tripping out my Delta monos).

Would someone be able to do a sort of VR type diagnosis of this unit - I.E. If I send you the schematic, would you be able to tell me where to measure? Once we identify the fault, then I will be able to replace the faulty component.

Please email me offline if you think you might be able to help.

Many thanks!!

Jon

jonclancy · 13th April 2004, 10:15 PM

Bump!

Just in case anyone missed this??

I am loath to start with the DMM in a random manner. Last time I did that, my D290 amp went back to ARCAM to get repaired!!

Cheers

Jon

rfbrw · 13th April 2004, 10:28 PM

How about starting with something simple. Use the meter to check for dc on the output.

ray.

jonclancy · 14th April 2004, 01:57 PM

Thanks Ray,

I'll be there with my meter tomorrow.

I assume that we are talking about measuring the "hot" rca connection to earth (or is it measuring between hot and cold on the rca....)?

Jon

DRC · 14th April 2004, 02:04 PM

Jon, I will give it a shot

PM me the schematics.

PS I have a BB 500 so I will be interested to see schematics ...

Dave

jonclancy · 14th April 2004, 04:04 PM

...you have mail!

Cheers

Jon

jonclancy · 15th April 2004, 08:37 PM

Dave,

the file ARCAM sent me did not include schematics, just some artwork showing where to add links for a voltage change...

Will detailed photos work, or measurements prompted by detailed photos??

Cheers

Jon

rfbrw · 16th April 2004, 01:26 AM

Hot and cold on the rca.
Given that you have no schematic, perhaps you could post the chip line-up of the analogue and digital stages.

ray.

jonclancy · 16th April 2004, 05:19 PM

Hi Ray,

here's a thread I posted when I first joined the forums.

ARCAM Black Box 50 Upgrade

It lists all the chips in the analogue and digital stages.

I have recontacted ARCAM and asked for the scemas that go with the Service Manual.

Thanks for your interest.

Jon

jonclancy · 16th April 2004, 06:47 PM

I have now measured the DC at the offending channel RCAs.

12.4 Volts!!!!!!

Other channel is pretty much zero (measured on the 200mv scale).

Would this indicate a burnt cap?

Cheers

Jon

10th April 2004, 11:24 PM	#1
jonclancy diyAudio Member Join Date: Oct 2002 Location: UK	ARCAM Black Box 50 Hi, as some may know, my BB50 has died on one channel (after misbehaving and tripping out my Delta monos). Would someone be able to do a sort of VR type diagnosis of this unit - I.E. If I send you the schematic, would you be able to tell me where to measure? Once we identify the fault, then I will be able to replace the faulty component. Please email me offline if you think you might be able to help. Many thanks!! Jon

14th April 2004, 04:04 PM	#6
jonclancy diyAudio Member Join Date: Oct 2002 Location: UK	Thanks Dave..... ...you have mail! Cheers Jon

16th April 2004, 05:19 PM	#9
jonclancy diyAudio Member Join Date: Oct 2002 Location: UK	Here is something I had prepared earlier..... Hi Ray, here's a thread I posted when I first joined the forums. ARCAM Black Box 50 Upgrade It lists all the chips in the analogue and digital stages. I have recontacted ARCAM and asked for the scemas that go with the Service Manual. Thanks for your interest. Jon

16th April 2004, 06:47 PM	#10
jonclancy diyAudio Member Join Date: Oct 2002 Location: UK	Dc! I have now measured the DC at the offending channel RCAs. 12.4 Volts!!!!!! Other channel is pretty much zero (measured on the 200mv scale). Would this indicate a burnt cap? Cheers Jon

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13th April 2004, 10:15 PM	#2
jonclancy diyAudio Member Join Date: Oct 2002 Location: UK	Bump! Just in case anyone missed this?? I am loath to start with the DMM in a random manner. Last time I did that, my D290 amp went back to ARCAM to get repaired!! Cheers Jon

13th April 2004, 10:28 PM	#3
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	How about starting with something simple. Use the meter to check for dc on the output. ray.

14th April 2004, 01:57 PM	#4
jonclancy diyAudio Member Join Date: Oct 2002 Location: UK	Thanks Ray, I'll be there with my meter tomorrow. I assume that we are talking about measuring the "hot" rca connection to earth (or is it measuring between hot and cold on the rca....)? Jon

14th April 2004, 02:04 PM	#5
DRC diyAudio Member Join Date: Jan 2003 Location: UK (south west)	Jon, I will give it a shot PM me the schematics. PS I have a BB 500 so I will be interested to see schematics ... Dave

15th April 2004, 08:37 PM	#7
jonclancy diyAudio Member Join Date: Oct 2002 Location: UK	Dave, the file ARCAM sent me did not include schematics, just some artwork showing where to add links for a voltage change... Will detailed photos work, or measurements prompted by detailed photos?? Cheers Jon

16th April 2004, 01:26 AM	#8
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	Hot and cold on the rca. Given that you have no schematic, perhaps you could post the chip line-up of the analogue and digital stages. ray.

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