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 Post subject: Re: Crown Jewel Help
PostPosted: Wed Jan 23, 2019 11:17 am 
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Where would I start trying to find the problem with the drive circuit? I’m ready to start probing and signal testing.


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 Post subject: Re: Crown Jewel Help
PostPosted: Wed Jan 23, 2019 11:32 am 
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Take voltage readings of IC5 and 5

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 Post subject: Re: Crown Jewel Help
PostPosted: Thu Jan 24, 2019 12:20 pm 
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Battery Voltage = 8.48v. Cable in both input and output jacks.

IC-5(a&b)- "TL072" Drive LED on.
(one to four on the bottom left to right) (five to eight on the top right to left)
1-6.92
2-6.92
3-3.44
4-0
5-6.38
6-6.89
7-6.89
8-13.79

Thanks


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 Post subject: Re: Crown Jewel Help
PostPosted: Thu Jan 24, 2019 1:48 pm 
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I think your battery might be dying. Do you have a power adapter?

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 Post subject: Re: Crown Jewel Help
PostPosted: Thu Jan 24, 2019 8:41 pm 
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Wall Wart -9v-300mA = 12.35v

IC-5(a&b)
(one to four on the bottom left to right) (five to eight on the top right to left)
1-11.05
2-11.05
3-6.5
4-0
5-10.22
6-11.05
7-11.05
8-22.1


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 Post subject: Re: Crown Jewel Help
PostPosted: Fri Jan 25, 2019 11:33 am 
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I'm sorry. I meant to say readings for IC4 and 5. So I need to see IC4 as well.

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 Post subject: Re: Crown Jewel Help
PostPosted: Fri Jan 25, 2019 11:34 am 
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Also, put the pedal in 9v mode for now and take readings again.

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 Post subject: Re: Crown Jewel Help
PostPosted: Fri Jan 25, 2019 12:48 pm 
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Wall Wart -9v-300mA = 12.59v
Drive LED on. In 9v mode
Cables in both in and out.
IC4
1-5.95
2-5.95
3-4.35
4-0
5-5.83
6-5.92
7-7.52
8-11.87

IC5
1-5.92
2- 5.92
3- 2.95
4- 0
5- 5.48
6- 5.93
7- 5.93
8- 11.9


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 Post subject: Re: Crown Jewel Help
PostPosted: Fri Jan 25, 2019 1:22 pm 
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Are you sure you haven't mixed up the drive and presence pots?

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 Post subject: Re: Crown Jewel Help
PostPosted: Fri Jan 25, 2019 1:57 pm 
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The unit is installed in the case now but here is a picture of the top before the relay replacement. Looks like they are in the correct positions. You can't see them all, but by the process of elimination, it look OK.


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Pots.JPG
Pots.JPG [ 900.35 KiB | Viewed 6476 times ]
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 Post subject: Re: Crown Jewel Help
PostPosted: Sat Jan 26, 2019 5:50 am 
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If your 9V power supply has an output of 12.59 volts it means that it is NOT regulated and has little if any filtration. Non-regulated power supplies should never be used with audio circuitry. They are a source of noise and should be avoided.

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 Post subject: Re: Crown Jewel Help
PostPosted: Sat Jan 26, 2019 11:18 am 
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The power supply is from my Zoom H2 digital recorder. I have a Voodoo ISO 5 on my pedal board but pretty inconvenient to use on the test bench. I've been using a 9v battery with a neg tip jack on it but they don't read 9v for very long. I'll get new values with the Voodoo


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 Post subject: Re: Crown Jewel Help
PostPosted: Sat Jan 26, 2019 2:02 pm 
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Voodoo ISO5= 9.30v at pedal power jack.
Drive LED on. In 9v mode
Cables in both in and out.
IC4
1-4.29
2-4.29
3-3.14
4-0
5-4.17
6-4.23
7-5.81
8-8.50

IC5
1-4.23
2- 4.23
3- 2.10
4- 0
5- 3.91
6- 4.23
7- 4.23
8- 8.50

The voltage relationships between pins looks the same no matter what the initial voltage is.


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 Post subject: Re: Crown Jewel Help
PostPosted: Mon Jan 28, 2019 1:55 pm 
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You bias voltages are off. Check and make sure you have the correct resistor values in place for R13/14 and R21/22

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 Post subject: Re: Crown Jewel Help
PostPosted: Mon Jan 28, 2019 4:25 pm 
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I visually checked (took a photo and enlarged it on screen to read the color stripes). They all appear to be the same (Brown/Blk/Blk/Red/ Brown) 10K/103.


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 Post subject: Re: Crown Jewel Help
PostPosted: Mon Jan 28, 2019 4:49 pm 
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You need to measure those resistors. BRN-BLK-BLK-RED-BRN is the code for a 10K. If you reverse the order of the colors it’s also the code for a 120Ω. You’ll need to disconnect one end of the resistor to get an accurate reading. Measuring a resistor while it’s in the circuit can give you false readings due to components that are in parallel with the resistor.

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 Post subject: Re: Crown Jewel Help
PostPosted: Mon Jan 28, 2019 5:26 pm 
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I don't think he needs to do that, Stephen. The voltages aren't far off enough to suggest theres a 120ohm in place of a 10k in the voltage divide.

The voltages are pretty close, but not perfect. Maybe the op amps were slightly damaged when you put them in the wrong sockets. Anything op amp in the MCU would have had 5V reverse polarity every time you pressed SW2.

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 Post subject: Re: Crown Jewel Help
PostPosted: Mon Jan 28, 2019 5:50 pm 
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Before I start to unsolder and end up breaking the wires off the resistors. Here are a couple of close ups. See what you think.

Thanks


Attachments:
R22-21.JPG
R22-21.JPG [ 162.17 KiB | Viewed 6413 times ]
R14-13.JPG
R14-13.JPG [ 229.32 KiB | Viewed 6413 times ]
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 Post subject: Re: Crown Jewel Help
PostPosted: Mon Jan 28, 2019 5:58 pm 
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Read my previous post. I don't think you need to do that. But the solder is a little weird looking. You might want to try reflowing the joints.

I think you most likely damaged one or more of the op amps when you had them in the wrong sockets.

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 Post subject: Re: Crown Jewel Help
PostPosted: Mon Jan 28, 2019 6:03 pm 
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Thanks Keith.
The soldering looked better before I did a reflow (today) from the component side.
Is there testing I can do or should I ask Hayley for replacements?


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 Post subject: Re: Crown Jewel Help
PostPosted: Tue Jan 29, 2019 11:12 am 
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No, you can't test an op amp. Not unless you have a known working circuit. You should get replacements for the 4558 and TL072.

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 Post subject: Re: Crown Jewel Help
PostPosted: Thu Jan 31, 2019 4:15 pm 
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I have replaced IC-4 and IC-5. Thanks you for the replacements parts.

Unfortunately, it did not improve the Drive side. Here is the current status.

Voodoo ISO5= 9.20v at plug.
Drive LED on. In 9v mode
Cables in both in and out. Pots at 12 o’clock
Boost side works great.
Drive side-
LEVEL - With all the pots at 12 o’clock the Level must be dimed to reach vol. unity and it’s clean.
DRIVE – this pot has no effect.
PRES. – this pot has little effect
M. FREQ – this pot has little effect

TREBLE – OK
MIDS – This pot has huge volume ramifications and starts to howl and feedback at 3 o’clock
BASS – OK

18V/9V – Switch pops and no difference between settings
MID Q – No discernable difference between positions
SOFT – LED- only one LED is dimly lit
Mid – no sound
Si –Sim to LED setting
HARD – No difference between all positions.

Voltages at new IC
IC4
1-4.25
2- 4.25
3-3.10
4-0
5-4.13
6-4.19
7-5.29
8-8.42

IC5
1-4.20
2- 4.20
3- 2.08
4- 0
5- 3.87
6- 4.19
7- 4.19
8- 8.42


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 Post subject: Re: Crown Jewel Help
PostPosted: Fri Feb 01, 2019 11:46 am 
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If the ICs are good, then your symptoms suggest you have a short somewhere in the drive section that is negating the drive pot and and clipping. Remove and measure the A500k drive pot. Check inside the pot to make sure there are no foreign objects inside it. Check the PCB to make sure there are no solder bridges or small wire strands that could cause a short. Inspect the bases of the toggle switches very closely to make sure there is nothing shorting.

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 Post subject: Re: Crown Jewel Help
PostPosted: Fri Feb 01, 2019 3:06 pm 
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I've removed the pedal from the enclosure and desoldered the drive pot. It reads from 0 to 470K ohms on both ends and wiper. I also reflowed solder where I could. The board is looking a little haggard due to desoldering one of the switches and general reflow. I could not see any obvious shorts and assume that D9 and D10 are bridged intentionally.


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 Post subject: Re: Crown Jewel Help
PostPosted: Fri Feb 01, 2019 5:18 pm 
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Yes, those diodes are supposed to be connected.

Does the wiper on the pot measure correctly, e.g., 250k to either side at noon; 0 on lug 3, 500k on lug 1 when full turn clockwise; and 0 on lug1, 500k on lug 3 when full turn counter clockwise?

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Please do not PM me. email is prefered. keith@buildyourownclone.com


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