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svengali
Bronze Member
Australia
111 Posts |
 Posted - 08/06/2008 : 05:22:27
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hello boss people.
i need help.
i have a ph 1 that has seen better days, and that i have decided to electronically restore.
I am not in the habit of restoring boss pedals, but i feel sorry for this one.
this thing has been dropped, the paint is kind of bubbling off, there are screws broken off at the stub that hold the baseplate on, one knob is shattered.
one of the raytheons has been replaced with a lm324n (from memory)
the serial number is 8700.
momentary led.
Interestingly, someone had performed the non momentary led mod.
I took a photo of this mod before converting back to stock.
I actually have a brand new raytheon, which i shall put in there where the lm324n is.
the light does come on, however there is no output.
Does anyone out there have the ph 1 schematic?
If so, i would appreciate it if they could email it to me.
thankyou bossarea people. |
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ssanyee
Silver Member
Hungary
288 Posts |
Posted - 08/06/2008 : 11:46:58
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Hi svengali,
Please check your PM!
cheers |
Edited by - ssanyee on 08/06/2008 11:50:40 |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 08/06/2008 : 14:23:02
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Hi ssanyee! Would you know where I could find a copy of the PH-1R schematic?  |
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ssanyee
Silver Member
Hungary
288 Posts |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 08/06/2008 : 14:49:20
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quote:
Originally posted by ssanyee
quote:
Originally posted by Laurie
Hi ssanyee! Would you know where I could find a copy of the PH-1R schematic?
In my HDD!
Check it out:
http://www.geofex.com/FX_images/Boss%20PH-1r.pdf
cheers
Thank you kindly |
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svengali
Bronze Member
Australia
111 Posts |
Posted - 08/07/2008 : 05:53:29
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update ph 1 repair.
ok, i have the schematic.
thanks very much you boss people.
(ssanyee told me he has 73 pedals, jesus christ on a bicycle thats manly)
my plan for repairing this pedal goes as follows.
1. beg for schematic. ( achieved )
2. make voltage chart ( achieved )
this is where i get an identical pedal that works, and copy down the voltages present on all the pins of the ic's, and all of the zeners and diodes and a few of the resistors )
3. look at the voltage charts( of both working and non working pedals ) and then look for discrepancies ( acheived )
there is chunk of the board in the lower left quadrant that has almost no voltage going to it.
4. Use the schematic to identify components.
5. Replace suspect components.
this method is a bit dodgy, but it should work.
what id really like to do is plug a very small constant ac signal (guitar signal) into the input of the pedal and trace the ac path through the pedal until it gets to the output.( of both the non working and working pedals)
I think people use signal generators for this.
I have no signal generator.
I am going to do some more investigating in this field, and then purchase an oscilloscope.
i shall update as i proceed.
thanks for all your help boss people, what a great site.
regards
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 08/07/2008 : 06:02:48
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quote:
Originally posted by svengali
I think people use signal generators for this.
I have no signal generator.
I use a "test tone" played out of my computer sound card - this one works well:
http://www.linaeum.com/downloads/misc/1kHz_30sec.wav
Any chance of posting the voltage chart for the known good pedal? |
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svengali
Bronze Member
Australia
111 Posts |
Posted - 08/07/2008 : 08:31:10
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laurie, i had to borrow to ph 1 to get the readings, i didnt take a comprehensive enough list for what you are after, but the guy is a good friend of mine ( i buy his pedals for him ) and in a few days i shall publish here the full voltage readings.
thanks for the test tone.
using that tone will be a very cool way to spend an entire afternoon.
who needs daytime tv i havent watched tv in fifteen years.
regards |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 08/07/2008 : 09:02:11
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Hi svengali
Can I ask what part of Oz you're in?
Regards Dr. Bob |
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svengali
Bronze Member
Australia
111 Posts |
Posted - 08/08/2008 : 01:21:07
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| hi dr bob, im in brisbane. |
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ssanyee
Silver Member
Hungary
288 Posts |
Posted - 08/08/2008 : 11:21:26
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Hi svengali from Brisbane  !
Do you have any updated info about PH-1 reparation?
cheers |
Edited by - ssanyee on 08/08/2008 11:22:01 |
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svengali
Bronze Member
Australia
111 Posts |
Posted - 08/10/2008 : 10:12:14
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hello again.
ok, after studying the schematic and the voltage chart, my intent was to commence swapping out suspect parts.
The problem i now face is that i have just moved house, and my solder sucker is missing in action.
When i find it, surgery will commence.
If i dont find it, i will try out a new techniques that im sure i havent invented.
I shall melt the solder, and then blast with compressed air.
This should work, but may be too messy. we shall see. |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 08/10/2008 : 11:03:05
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quote:
Originally posted by svengali
hello again.
ok, after studying the schematic and the voltage chart, my intent was to commence swapping out suspect parts.
The problem i now face is that i have just moved house, and my solder sucker is missing in action.
When i find it, surgery will commence.
If i dont find it, i will try out a new techniques that im sure i havent invented.
I shall melt the solder, and then blast with compressed air.
This should work, but may be too messy. we shall see.
Hi svengali
I shall melt the solder, and then blast with compressed air.
In the interests of safety:
I suggest that you  against the wall for thinking about the technique.
And recommend that you don't every try it, for many safety reasons as well, like hot balls of solder on your hands face & possibly in your eyes.
Not to mentions hundreds of new slivers of solder - shorts all over the PCB.
Have you never heard of Solder wick?????
Regards Dr. Bob
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svengali
Bronze Member
Australia
111 Posts |
Posted - 08/18/2008 : 13:31:44
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hello, thanks for the warning.
i found my solder sucker, which is probably for the best considering...
anyway, i changed over the bottom ic, and fixed the pedal.
this one is a victory, but using this dodgy method of repairing, there are some failures, some rather spectacular failures.
I once did some stick welding in bare feet.
I stepped on a bit of almost molten metal , which happenned to be a
17 mill hex nut..the scar stayed for months.
thanks for your help boss people. |
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help!..
