| Author |
 Topic  |
|
zentropa
Gold Member
USA
837 Posts |
 Posted - 02/27/2010 : 06:48:21
|
| based upon our emails it appears that the LED in D5 isn't lighting at all when signal is applied so i'm guessing the problem lies in one of the components that the signal passes through between the input jack and the clipping diodes... |
 |
|
|
Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 02/27/2010 : 07:28:38
|
There is signal at pin 7, no diode light. I'm guessing C9 is not installed properly, or there is a short across the diodes.
|
|
|
|
kelmaur
Gold Member
USA
505 Posts |
Posted - 02/27/2010 : 16:53:15
|
quote:
Originally posted by Laurie
There is signal at pin 7, no diode light. I'm guessing C9 is not installed properly, or there is a short across the diodes.
ok..will check C9 and post results
|
|
|
|
zentropa
Gold Member
USA
837 Posts |
Posted - 02/27/2010 : 17:31:44
|
yah, i'm no electronics wiz, but you may want to investigate all of the solder joints in this region making sure they are clean as that area will probably be the culprit if C9 is the problem.
 |
|
|
|
kelmaur
Gold Member
USA
505 Posts |
Posted - 02/27/2010 : 17:52:26
|
quote:
Originally posted by zentropa
yah, i'm no electronics wiz, but you may want to investigate all of the solder joints in this region making sure they are clean as that area will probably be the culprit if C9 is the problem.
ok..desoldered and resoldered C9 and the LED (D5)..still no LED lighting up...i remember orientating it correctly..what size is this LED..??
question....is (looking at the part side of the board with the ASS # on the bottom are the left legs of D5 and D4 supposed to be bridged by solder..i looked on my other (stock) DS-1 and it they are on that one...just curious |
|
|
|
Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 02/27/2010 : 21:11:52
|
Yes to the bridging.
Do you have a multimeter? Can you measure the resistance across D5 both directions? |
|
|
|
kelmaur
Gold Member
USA
505 Posts |
Posted - 02/28/2010 : 05:31:44
|
quote:
Originally posted by Laurie
Yes to the bridging.
Do you have a multimeter? Can you measure the resistance across D5 both directions?
ok..i got 1.744 and .573 across D5 |
Edited by - kelmaur on 02/28/2010 05:32:07 |
|
|
|
Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 02/28/2010 : 05:35:04
|
That's volts on the diode tst, yes?
Assuming that was volts... then the doides aren't short.
Using the probe - is there a signal on both sides of C9? |
|
|
|
kelmaur
Gold Member
USA
505 Posts |
Posted - 02/28/2010 : 05:57:49
|
quote:
Originally posted by Laurie
That's volts on the diode tst, yes?
Assuming that was volts... then the doides aren't short.
Using the probe - is there a signal on both sides of C9?
yes?...im using the meter on the diode setting (diode symbol on meter) doesnt say on the screen whether it is volts or not
checking signal on C9 as we speak.....results in next post |
|
|
|
kelmaur
Gold Member
USA
505 Posts |
Posted - 02/28/2010 : 06:10:44
|
quote:
Originally posted by Laurie
That's volts on the diode tst, yes?
Assuming that was volts... then the doides aren't short.
Using the probe - is there a signal on both sides of C9?
yes there is signal on both sides of C9 |
|
|
|
kelmaur
Gold Member
USA
505 Posts |
Posted - 02/28/2010 : 07:15:08
|
i think the issue is with R14...
i have probed it and no signal from either side of R14
i desoldered and resoldered R14 and one leg is short, but still usable and the other leg is long, plenty of lead on back side
when i solder it on the one side the solder joint looks good visually
and the other the solder balls up high on the lead (oxidation? on the lead)
resoldered it twice and still not getting any signal ffrom R14
everything else seems to be getting signal |
|
|
|
kelmaur
Gold Member
USA
505 Posts |
Posted - 02/28/2010 : 07:30:17
|
| does R14 have anything specific to do with this mod as far as the sound of the mod? |
|
|
|
zentropa
Gold Member
USA
837 Posts |
Posted - 02/28/2010 : 08:35:48
|
i believe R14 mostly does volume levels.
looking at the original pictures there's a chance that R14 got overheated. you can probably stick the original resistor back in there for the time being and still get something close to what the mod is supposed to sound like.
90% of the real change you get from the mod is from the LED in D5. pretty much everything else is more of a tonal upgrade (hi fi, reduced noise, improved clarity, etc.) or volume boost.
the upside is that 1.5k resistors are fairly common and even radio shack has them in packages of 5 for $1.
quote:
and the other the solder balls up high on the lead (oxidation? on the lead)
do you mean it doesn't want to stick to the pads on the traces? if so that might explain the problems. you may have to jumper a wire from the component leg directly to the next component's joint.
|
|
|
|
kelmaur
Gold Member
USA
505 Posts |
Posted - 02/28/2010 : 08:58:13
|
quote:
do you mean it doesn't want to stick to the pads on the traces?� if so that might explain the problems. you may have to jumper a wire from the component leg directly to the next component's joint.
yes...some will stick to the pad, but not too much..it balls up and seems like it rises to the top of the lead and some sticks to the pad
oh and it does get a little signal and then when i probe it again it wont , then it does a little again |
|
|
|
kelmaur
Gold Member
USA
505 Posts |
Posted - 02/28/2010 : 09:04:51
|
quote:
Originally posted by zentropa
i believe R14 mostly does volume levels.
looking at the original pictures there's a chance that R14 got overheated. you can probably stick the original resistor back in there for the time being and still get something close to what the mod is supposed to sound like.
90% of the real change you get from the mod is from the LED in D5. pretty much everything else is more of a tonal upgrade (hi fi, reduced noise, improved clarity, etc.) or volume boost.
the upside is that 1.5k resistors are fairly common and even radio shack has them in packages of 5 for $1.
quote:
and the other the solder balls up high on the lead (oxidation? on the lead)
do you mean it doesn't want to stick to the pads on the traces? if so that might explain the problems. you may have to jumper a wire from the component leg directly to the next component's joint.
will i get the full effect of the mod if i put the stock resistor back in there |
|
|
|
Topic |
|
No signal (seeing eye mod DS-1) My first Mod
