Early Boss CE-2 LED works, but no modulation

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Hagstrom71
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Re: Early Boss CE-2 LED works, but no modulation

Post by Hagstrom71 » Sat May 04, 2019 6:29 pm

I had a tech take a look at my CE-2 and turns out it was a grounding issue with one of the pots that was killing the chorus fx.
A bit embarrassed I wasn't able to figure that out, but at least it's back in working condition. Thanks for all the troubleshooting suggestions.
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jerms
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Re: Early Boss CE-2 LED works, but no modulation

Post by jerms » Sat May 04, 2019 7:32 pm

hah! had that same sort of prob with a TS-9! but there the short took out one of the divider resistors in the power supply for the 4.5V bias supply...
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Re: Early Boss CE-2 LED works, but no modulation

Post by Spook » Sat May 04, 2019 8:39 pm

...And i had it today in a Double sound wah, one of the wires to the pot was not cut at the lug, and touching the pot. Made it work backwards and other wierd stuff,
i was about to go batsh*t crazy before i figured out what was wrong :bangs head: .
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devnulljp
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Re: Early Boss CE-2 LED works, but no modulation

Post by devnulljp » Sun May 05, 2019 6:37 am

Hagstrom71 wrote:
Sat May 04, 2019 6:29 pm
I had a tech take a look at my CE-2 and turns out it was a grounding issue with one of the pots that was killing the chorus fx.
A bit embarrassed I wasn't able to figure that out, but at least it's back in working condition. Thanks for all the troubleshooting suggestions.
Don't be. I have an old analog delay that hasn't ever worked right. If I open it up, it works fine, but as soon as I put the case back together no delay.
It's been sitting in a box for years, but I took it out the other day to look at it and it turns out the input jack is grounding out on the case, Doh!
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Hagstrom71
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Re: Early Boss CE-2 LED works, but no modulation

Post by Hagstrom71 » Sun May 05, 2019 6:44 am

That's similar to what mine was doing! the pots were grounding out on the case. :doh:
rileyismycopilot
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Re: Early Boss CE-2 LED works, but no modulation

Post by rileyismycopilot » Mon Jun 10, 2019 10:20 pm

Hi gang,

I have a japanese made flanger pedal that doesn't work. LED does light up but all I get is the bypass signal (zero effect whatsoever).
Should I measure the opamp voltage too? Does it include the MN300x chip voltage and MNxxxx clock driver?

Thanks very much!
rileyismycopilot
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Re: Early Boss CE-2 LED works, but no modulation

Post by rileyismycopilot » Mon Jun 10, 2019 11:13 pm

OK so I went ahead a took some voltages on the RC4558P chip.
(EDIT: there's 2 of them but one is an LFO chip that seem to work ok, as pin 3 and 7 provide varying voltages from 2 to 7V)

Here's what I got on the "non LFO" 4558 chip:

Pin 1: can't get measurement, starts at around 3V then slowly goes down and stabilizes at around 0.4V
Pin 2: same
Pin 3: 4.9V
Pin 4: 0V
Pin 5: 4.9V
Pin 6: 8.9V
Pin 7: 8.7V
Pin 8: 8.9V

It looks fishy to me but I honestly don't know squat about ICs.
Is it good ?
Or should I replace it?
Or should I look for bad components next to it?
Or should I look elsewhere?

Thanks very much for the answer.
Last edited by rileyismycopilot on Tue Jun 11, 2019 12:31 am, edited 1 time in total.
rileyismycopilot
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Re: Early Boss CE-2 LED works, but no modulation

Post by rileyismycopilot » Mon Jun 10, 2019 11:15 pm

(BTW I wish I could open a new thread but as a new member I can not do that, so I'm hijacking this thread as the original poster asked about a solving problems on an old chorus which is quite similar to my old flanger).
Scruffie
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Re: Early Boss CE-2 LED works, but no modulation

Post by Scruffie » Sat Jun 22, 2019 4:32 pm

Yup, that looks bad but do you have a name for this mystery flanger so I can see a schematic? Could be something around the chip causing it.
rileyismycopilot
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Re: Early Boss CE-2 LED works, but no modulation

Post by rileyismycopilot » Sun Jun 23, 2019 10:33 pm

Thanks for the answer!
The Flanger in question is a "Guyatone PS004". Please let me know if you find something.
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