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Pacafeliz
Copper Member
Mexico
28 Posts |
 Posted - 04/25/2007 : 21:08:59
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here's some shots that might interest some of you guys, enjoy!
it's the '78 on the left, '80 on the right
notice how the '78s box is painted inside and out, plus the switch is transparent.
'78 with large chip
'80 with the classic JRC 4558D chip
yes i know the OD-1 has a burnt out component in the lower right corner, anyone know what it is, so i can repair it? i quit using the OD-1 since i got hooked on the SD-1s (i use 2 of 'em), and it's getting too valuable (plus personal reasons - it was my dad's).
the '80 sold for $245 on ebay (insane, eh?!), here's the link with more pics:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=200075340622
hoping some of you will find this interesting... good luck!
Pat.
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ronster
Gold Member
Australia
645 Posts |
Posted - 04/26/2007 : 05:01:36
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Wow great pics! Nice to see some of the differences.  |
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Goran
Double Platinum Member
Sweden
2203 Posts |
Posted - 04/26/2007 : 07:43:56
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| Thanks a lot!!! Great pictures! |
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controlfreak
Silver Member
Ireland
337 Posts |
Posted - 04/26/2007 : 09:46:03
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| that's a diode that's burnt out. |
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strat714
Silver Member
USA
156 Posts |
Posted - 04/27/2007 : 17:33:41
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| That's a zener diode. A 05Z11A zener diode to be exact. |
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sp-1
Platinum Member
Germany
1454 Posts |
Posted - 04/27/2007 : 17:48:34
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cool pics  |
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
Posted - 05/06/2007 : 18:18:19
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Thx Pacafeliz for the clear pics, very helpful!!
I noticed the values of C2 and R4 are different, but same frequency.
R2 is different with better impedance in the '80. Don't know what R13 does tho. Wonder if it has to do with the IC being different, so required new values to prevent damage or improper operation of teh IC.
does each one has its own stock values? Or replaced what was there originally? Any sound difference in the two?
Interesting to see more than an IC change in the circut. |
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svengali
Bronze Member
Australia
111 Posts |
Posted - 07/17/2007 : 02:13:24
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| does anyone know why did that diode burnt out? |
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Pacafeliz
Copper Member
Mexico
28 Posts |
Posted - 07/17/2007 : 04:41:18
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quote:
Originally posted by svengali
does anyone know why did that diode burnt out?
i'd like to know, too...
now when i put a battery in there, the battery gets hot and sucked dry in about 5 secs! |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 07/17/2007 : 15:32:13
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quote:
Originally posted by Pacafeliz
quote:
Originally posted by svengali
does anyone know why did that diode burnt out?
i'd like to know, too...
now when i put a battery in there, the battery gets hot and sucked dry in about 5 secs!
Hi Pacafeliz
The battery gets hot because the diode-zener, is shorted, it is the protection zener diode.
It probably had a reversed polarity plug pack connected to it.
You can remove the protection zener, & then test the OD-1 with a fresh battery,
The one that got hot, just had all the life sucked out of it, & will be very flat.
If the pedal then works with a fresh battery, then you can try plugging in a plug pack with the correct polarity & voltage.
To be on the safe side use a genuine Boss adapter.
I think that the early OD-1 that you have works off an ACA adapter.
When you know it's all working again, then replace the zener,
it's probably a 9.1 Volt (11V edited 18-07-07) 500mA or 1 watt type, but the other guys can back me on that one, I don't know all the Boss Zener numbers.
It is one of the most common & prelevent faults with most Boss & other compact pedals.
It's a common voltage and part, it just sells under lots of different number, depending on the company the manufactured it.
If you have a multimeter, you can test the faulty zener, it will read a short circuit, in both directions.
That's the part that's (over)-heating the battery. 
Good Luck.
Regards Dr. Bob 
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Edited by - Dr. Bob on 07/17/2007 23:07:16 |
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bossarea
Forum Admin
United Kingdom
3652 Posts |
Posted - 07/17/2007 : 22:45:41
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The zener is D1 and is probably marked as such on the PCB. Since it's an ACA pedal it's a 12V zener (actually 11V according to schematic).
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 07/17/2007 : 22:59:12
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quote:
Originally posted by strat714
That's a zener diode. A 05Z11A zener diode to be exact.
Hi Bossarea & Guys
Thanks for clearing that up Bossarea.
Just going by the part number ..Z11. (11 volts).
Regards Dr. Bob
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Topic |
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For the curious: Comparing two different OD-1s
