Help Boss CE-2 sound but no chorus

[whomeno]

ok bilt it from here
http://tagboardeffects.blogspot.com/2014/06/boss-ce-2.html
sound on bypass. sound when engaged but no effect.











Voltages   8.88 supply

IC1 4558
1=4.68
2=4.67
3=4.66
4=0
5=4.79
6=4.67
7=4.67
8=6.72

IC2  TL022
1=.63
2=4.67
3=3.82
4=0
5=4.67
6=3.96
7=6.09
8=6.71

IC3  MN3007
1=6.72
2=4.17
3=3.39
4=1.23
5=0
6=3.11
7=1.27
8=1.27

IC 4 mn3101
1=6.73
2=3.11
3=0
4=4.17
5=.84
6=5.36
7=2.36
8=1.22
Q1  2n5088
E=3.64
B=4.01
C=6.87

Q2
E=3.99
B=4.51
C=6.81

Q3
E=3.70
B=6.76
C=6.75

Q4
E=0
B=.62
c=2.20

Q4
E=4.43
B=4.90
C=6.73

[Slowpoke101]

First thing to do is to find out why the 9V rail is so low. 6.72V is too low for correct operation.
Take out the MN3007 IC and re-measure the voltage on pin 1 of its socket.
If the voltage has come up to just above 8V or higher, good. If not, take out the MN3101 IC and check the voltage again on pin 1 of the MN3007 socket.
Let us know what you find.

[whomeno]

mn3007 pin 1 with out chip=8.41

[Slowpoke101]

Oh. OK.
Double check that the 33R resistor connected to the incoming 9V lead is actually 33R.

Where did you get the MN3007 from?

[whomeno]

ebay
i get 8.77 on power side of 33r and 8.41on otheir side

[whomeno]

it is 33R

[whomeno]

every thing is hooked up except led

[Slowpoke101]

The volt drop through the 33R resistor is fine.
Check all the tracks around the MN3007 and MN3101 ICs for possible shorts.
Even though this would not cause you present problems , check the 22K (?) resistor going to LED+, it appears that you have a 220K there. Also the 33n capacitors (two of them) near the 4558 IC are 330n (334) capacitors.

[whomeno]

got the mn3007 from here
https://www.ebay.com/itm/1Pcs-Panasoni-MN3007-Microcomputers-Controllers-DIP-8-Ic-New-tb/223138065314?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

[whomeno]

you are right on the 33n the 22k is a 22k
will make changes and get back to you

[Slowpoke101]

You may have got a faulty IC or a counterfeit (chip markings reprinted).
The supplier is actually in China - not the USA as claimed. Re-branded chips are quite common.

Thoroughly check the board for shorts or other problems around the MN3007 and MN3101 chips.

I would suggest getting a MN3007 and MN3101 from Smallbear. They should be genuine.

http://www.smallbear-electronics.mybigcommerce.com/ic-mn3007/

http://www.smallbear-electronics.mybigcommerce.com/ic-mn3101/

[whomeno]

I have power on gr side trying to find it

[whomeno]

I'm getting 8.82 on the ground rail

[whomeno]

found it!!!!

[Slowpoke101]

found it!!!!

Good job. Now does anything work?

[thermionix]

I too have doubts about your MN3007.  The font looks wrong.  The picture on the Ebay listing looks right.  That doesn't mean Matsushita never changed the printing, I'm certainly no expert.

[whomeno]

IC 4558
1=4.67
2=4.67
3=4.69
4=0
5=4.74
6=4.77
7=4.75
8=6.60

IC2 TL022
1=.59
2=4.68
3=.59
4=0
5=4.66
6=4.66
7=all over the place
8=6.56

IC3  mn3007
1=6.56
2=3.57
3=3.39
4=1.23
5=0
6=2.83
7=1.31
8=1.31

IC4  mn3101
1=6.57
2=2.82
3=0
4=3.57
5=.19
6=5.98
7=1.47
8=1.24

Q1
E=6.58
B=4.04
C=3.61

Q2
E=6.59
B=4.44
C=3.90
Q3
E6 3.69
B=4.14
C=6.61
Q4
E=0
B=.21
C=5.95
Q5
E=-2.10
B=-.17
C=6.63

[Slowpoke101]

The volt-drop through the 33R resistor is back.
What voltages do you get without the MN3007 installed?

[whomeno]

getting a little effect not much.
If i unhook vibe switch gose dead

[whomeno]

8.39