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Dr. Bob
Moderator
Australia
6593 Posts |
 Posted - 09/25/2006 : 16:41:26
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I was wondering if anyone on this forum has worked on an Ibanez DL5 Digital Delay pedal - (SoundTank Series)
Apparently the previous owner plugged in the wrong wall wart, in a drunken stupor? The rest is now history.
I bought it, as part of a batch of dead pedals, from the same drunken
wrong wall wart guy.
So far, & without the schematic, I have found the following faults:
Blown protection Diode (blown clean in half).
78L05 T092 regulator faulty - no output, don't think it was shorted.
4164 64K x 1bit RAM faulty (could fry eggs on it)
Have not yet tested, if the M50195P karaoke delay chip is functioning.
who ever looked at it before I did, put the earthing strap across the
back of the PCB directly across the 4164 RAM chip, shorting out
a bunch of its pins.
Current Status:
The pedal now toggles on & off , but there seems to be no audio,
I think, I will have to dig out the signal generator & CRO
to track down where the audio is geting lost.
I recently found a schematic on the net, this pedal has been
a great challange, the schematic will definitely help.
Any help would be appreciated.
Stay tuned to this channel, for the next exciting episode...
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Edited by - Dr. Bob on 10/08/2006 17:59:05 |
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bossarea
Forum Admin
United Kingdom
3652 Posts |
Posted - 09/25/2006 : 16:51:37
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Moved this topic to the tech area.  |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 09/25/2006 : 17:12:16
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Thanks Bossarea.
I thought this area was only for Boss pedals & products. |
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bossarea
Forum Admin
United Kingdom
3652 Posts |
Posted - 09/25/2006 : 22:49:21
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| Didn't think about it before now but it does look that way from the headers doesn't it? |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 09/28/2006 : 17:44:20
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This baby is nearly going.
I ran the Sig Gen over it yesterday, & have narrowed down the fault
to the input stage, its a Mitsubishi 5218A Dual OpAmp
Same pinouts as a 4558 just a lower current/noise device.
I will swap it out tomorrow, if family time allow,& keep you all posted.
Same Bat-Time, Same Bat-Channel. |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 09/29/2006 : 16:25:11
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For those of you who are following this topic.
I removed IC1 the Mitsubishi 5218A Dual OpAmp
this is the input opamp on the PCB
I added an 8 pin socket to the PCB, & replaced the 5218A with a 4558
well I was right (partly anyway) the DL5 fired up & seemed to be functioning as a delay should.
But I noticed that it had a gritty type of distorion sound as well as the delay.
I did play with it in this condition, for about 20 mins or so.
I am now surmising, that the fault, may have also damaged IC5 the
output IC (also a 5218A). I will attempt to change this tomorrow.
I know that there will be some of you, that will think, that I
should probably leave it the way it is, with the distortion.
like (2) pedals in one, actually, it is a very pleasant combination of effects.
Remember -- Same Bat-Time, Same Bat-Channel. |
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diggum12
Silver Member
USA
282 Posts |
Posted - 09/29/2006 : 18:10:25
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| Maybe the 4558 is too aggressive for that delay. What about a TL072? |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 09/30/2006 : 16:45:40
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Good point Diggum12
I don't want to dispel your theory, and please don't take this the wrong way, and I will keep your theory in mind,
but I tend to doubt it, as I have another Ibanez delay pedal,
The DL10 Digital Delay
and It is almost identical to the DL5 except that the 3 pots on the DL10 are mounted on a outrigger board attached with ribbon flex.
The DL10 uses 4558 op-amps in both the input & output sections.
The input circuit is wired as a Unity Gain Buffer (1 in 1 out) on both the DL5 & DL10
While I haven't look at the signal with a CRO, it sounds like the distortion is coming from the output op-amp.
The wrong wall wart in drunken stupor guy, must have really belted this pedal, with a high voltage wall wart, I would say at least over 18 to 24 volts
The input op-amp was was seriously damaged, The delay chip was protected by the reverse diode blowing up & the 5V regulator going open circuit.
I did not get a chance to replace the the output op-amp today.
I know that there are some Ibanez pedal collectors that are paying BIG dollars for the DL10 & it's warm delay sound, & I will admit I am a fan of the DL10 delay sound (all 400mS of it).
I saw a DL10 go for 180 plus Euro that's about $316 Aust. way out of my league.
The DL10 & the DL5 use the same Mitsubishi M50195P karaoke delay chip
and 4164 (1 bit by 64K RAM chip), the same input & output circuit; The 5V regulator on the DL5 is a 78L05, & a discrete 5.6V zener & 1815 transistor on the DL10.
The DL5 has the 3 pots mounted on the PCB.
While I admit, I don't have a DL10 Schematic.
The circuits for both seem to be Identical with some very minor differences.
I have some Pics of both PCB's that I can post if anyone is interested, & If I can upload them,
I have been getting server timeout errors, when trying to uploading
pics, & yes I have resized them to 200K and under
So if you you are looking for the warm sound of an Ibanez DL10
save your hard earned cash & buy one of the cheaper & more abundant DL5 SoundTank series delays.
I will keep you all informed about the progress of the DL5 repair. |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 10/03/2006 : 17:16:45
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Well guys,
I am now the proud new father of a fully functioning Ibanez DL5
I suppose this should now really go into the - New Pedals Acquired forum.
It turned out that it was IC5, the output IC, that was also damaged by the
over-voltage & wrong polarity plug pack, inserted by the previous owner.
I replaced IC5, another Mitsubishi 5218A Dual OpAmp, for a 4558
The distortion vanished, the pedal burst into life, & is now just like that day it was made.
I reassembled it & then just played with it for the about 30 mins or so,
This is a very sweet sounding delay, I can see why people who own these,
rave about them.
Other than the substitution of the 5218A's for 4558's which are used in the DL10
the pedal is stock.
After playing it, I decided to replace the 47nf input cap for a MKT type 100nf cap. the difference was negligible, but the input cap is now a lot better quality.
You really have to hear this pedal to believe just how good it is.
I do not have a Boss DD2-3-5 to compare it with, but my friend, is bringing over his MIJ, DD-2, so we can do a comparison & test.
So to sum it all up, I replaced:
1- 1N4007 or 1N4004 protection Diode
1- 78L05 T092 5 Volt regulator
1- 4164 64K x 1bit RAM faulty
2- Dual op amps type 5218A for 4558 (IC1 & IC5)
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Repairing a Dead Ibanez DL5 Digital Delay
