DOD - FX65B gut picture and voltages

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hemisfeer
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Post by hemisfeer »

I recently fixed one of these and here's a gut picture with voltages
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DOD FX65B inside 20%.jpg

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Fender3D
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Post by Fender3D »

If you can, please check min and max clock at MN3007's pins 2 and 6.

Thanks for the picture.

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Post by hemisfeer »

How would I check those using an oscilloscope? Would those measurements look like two lines on the display? Or would I use a multimeter with Hz? My repair skills are pretty simple. I try to stick to analog circuits. Mostly OD's, distortion, and fuzz. I've been attempting to learn how BBD circuits work, but I have a lot to learn as far as how and why things work.

All I had to do was replace the switch and one pot to get this working again.

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Post by Fender3D »

DMM with Hz is fine,
just set speed at minimum and depth at max for a better reading.

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Post by hemisfeer »

Will do! Thanks for getting back to me. I'm dipping my foot into this more complicated type of effect. Lots to learn!

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Post by hemisfeer »

Do I put the leads on pin 6 and pin 2? Doing that with speed down and width up, it bounces between 62.5 kHz and 71 kHz. Does this seem right? With the speed maxed out I get more of a stable reading of 67 kHz. Any advice would be appreciated.
Fender3D wrote:DMM with Hz is fine,
just set speed at minimum and depth at max for a better reading.

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Post by Fender3D »

Thanks for checking.
Values are in line with other choruses, width of delay is a tad small I thought it was somewhat larger, but that is

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Post by hemisfeer »

Is there something I can read to help me understand this better?

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Post by Fender3D »

Mark Hammer @ https://archive.ampage.org/
read about chorus, flanger and analog echo here or @ DIYstompboxes

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Post by hemisfeer »

I just got the FX65 fixed. Would anyone be interested in the same picture and voltage information as I did on the FX65B?

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Post by hemisfeer »

Can't connect to the link provided
Fender3D wrote:Mark Hammer @ https://archive.ampage.org/
read about chorus, flanger and analog echo here or @ DIYstompboxes

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Post by Fender3D »

It works for me....
it's an old site try https://hammer.ampage.org/ https://hammer.ampage.org/
BTW if you google Mark Hammer you'll find lots of interesting articles

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Post by hemisfeer »

I got it to work with google chrome. Edge didn't like it for some reason. Thanks!

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Post by andregarcia57 »

Image

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Post by Technorebelde »

I'm repairing one, my first chorus repair, it makes a throbbing sound and the chorus effect is very VERY subtle, was using your voltages to compare, all seems fine except for the 14 leg chip, leg 5 reads 4.5 and couldn't read leg 3 because it keep switching the effect on/off.

Also noted something weird with pots, all are W100k pots, but have peculiar readings

Reading form 1 and 3 legs
P 1: ccw 89.6k to 0 cw
P2: ccw 0 to 84 cw
P3: stays at 31.8 ccw through cw

Reading form 1 and 2 legs
P 1: stays at 0 ccw through cw
P2: ccw 0 to 84 cw
P3: ccw 0 to 36 to 31.8 cw

Reading form 2 and 3 legs
P 1: ccw 89.6k to 0 cw
P2: stays at 0 ccw through cw
P3: ccw 31.8 to 36 to 0 cw

don't know how a W taper must read, but I'm thinking in buying ones from tayda

Can someone help me out?

thanks!

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