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hot tubes
Silver Member
Canada
162 Posts |
 Posted - 05/29/2009 : 02:46:44
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what would cause a dim LED on a CS-3 , my dvom says it
has 2.43 volts when lit , i installed a 3 mm super brite
LED. but still it is very dim , tryed a different LED ,and
same problem .
what resistor controls the LED voltage , sorry i can't find
a good schematic around.
thanks to the forum. |
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cctsim
Silver Member
United Kingdom
418 Posts |
Posted - 05/29/2009 : 02:53:55
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R35 controls the LED current.
There is also a z-diode (D9) in series that might be the problem.
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hot tubes
Silver Member
Canada
162 Posts |
Posted - 05/29/2009 : 03:16:47
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i'l check it out an get back to you !!
thanks again............. |
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hot tubes
Silver Member
Canada
162 Posts |
Posted - 05/29/2009 : 03:42:43
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removed D9 diode and jumperd it and the LED is now BRIGHT !!
but i don't have a zener diode on hand , will any other diode
work or no ?
thanks for your help . |
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cctsim
Silver Member
United Kingdom
418 Posts |
Posted - 05/29/2009 : 04:33:21
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According to the schematic, it needs to be a 5.6V zener diode. They are quite cheap so the best thing is to get a proper replacement.
Regular Si diodes will have a different behavior and probably not work. |
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hot tubes
Silver Member
Canada
162 Posts |
Posted - 05/29/2009 : 04:36:39
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will it damage anything to run it with the jumper wire ?
thanks |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 05/29/2009 : 14:34:41
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Can't seem to find a schem that gives the value of R35. What value is it?
If R35 is anything above 1k, it should be fine. I've always felt that Boss' approach of putting a zener in this part of the circuit was a bit "belt and braces". |
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hot tubes
Silver Member
Canada
162 Posts |
Posted - 05/29/2009 : 15:34:31
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| R35 = 3.3K and it checks out good . |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 05/29/2009 : 16:26:54
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| Yeah... you should be OK to leave D9 jumpered. Worst case is something puts a reverse voltage spike on the LED and kills it. |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 05/29/2009 : 18:10:37
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Hi hot tubes & Guys
I'm not 100% sure if missed something here.
But is your CS-3 an earlier one that uses the ACA unregulated 12VDC adapter?
I have one that is ACA, & another that is PSA 9VDC Regulated modern type.
Is/was the LED still dim if you used a known good 9V battery?
My ACA has the DIM LED when used with a PSA.
I just did the ACA to PSA resistor mod to mine.
Hope this helps?
Regards Dr. Bob  |
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cctsim
Silver Member
United Kingdom
418 Posts |
Posted - 05/29/2009 : 21:53:35
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Good point Dr Bob.
I remember I had to remove D10 and R32 and short them in order to use a PSA adapter. |
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hot tubes
Silver Member
Canada
162 Posts |
Posted - 05/30/2009 : 04:26:03
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quote:
Originally posted by Dr. Bob
Hi hot tubes & Guys
I'm not 100% sure if missed something here.
But is your CS-3 an earlier one that uses the ACA unregulated 12VDC adapter?
I have one that is ACA, & another that is PSA 9VDC Regulated modern type.
Is/was the LED still dim if you used a known good 9V battery?
My ACA has the DIM LED when used with a PSA.
I just did the ACA to PSA resistor mod to mine.
Hope this helps?
Regards Dr. Bob
HELLO DR.BOB
this cs-3 is a standard 9 volt type.
thanks for your help . |
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hot tubes
Silver Member
Canada
162 Posts |
Posted - 06/01/2009 : 20:22:37
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finished installing the supplied monty allums kit , and left in the
jumper wire , my customer is happy now , he has a great sounding
CS-3 with a working LED to boot !!!
thanks again to the forum for your help !!! |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 06/02/2009 : 08:44:15
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Hi hot tubes
Nice to hear you have it all up and running again.
Which CS-3 schematic are you working from, or referencing?
Or do you possibly have the actual CS-3 Service notes?
Regards Dr. Bob |
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hot tubes
Silver Member
Canada
162 Posts |
Posted - 06/06/2009 : 21:41:45
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hello DR. BOB
i can't remember , but it was a link off this site ..... |
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gmreszel
Copper Member
USA
32 Posts |
Posted - 06/08/2009 : 05:46:02
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| While we're on the topic. I just did an outdoor Friday and the stock leds were useless. Apart from putting clear brights in, how can I find the the proper R location for each of my pedals so I can change to value for brighter,,,it's not the same location for all pedals is it (R35)? I have a lot of outdoor gigs this summer and I need the leds to be able to compete with the sun. |
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Topic |
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DIM LED ON A CS-3
