ok bilt it from here
http://tagboardeffects.blogspot.com/2014/06/boss-ce-2.html
sound on bypass. sound when engaged but no effect.
(https://i.postimg.cc/4nvh5P4N/100-0764.jpg) (https://postimg.cc/4nvh5P4N)
(https://i.postimg.cc/S26jgQht/100-0765.jpg) (https://postimg.cc/S26jgQht)
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
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.
mn3007 pin 1 with out chip=8.41
Oh. OK.
Double check that the 33R resistor connected to the incoming 9V lead is actually 33R.
Where did you get the MN3007 from?
ebay
i get 8.77 on power side of 33r and 8.41on otheir side
it is 33R
every thing is hooked up except led
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.
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
you are right on the 33n the 22k is a 22k
will make changes and get back to you
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-mn3007/)
http://www.smallbear-electronics.mybigcommerce.com/ic-mn3101/ (http://www.smallbear-electronics.mybigcommerce.com/ic-mn3101/)
I have power on gr side trying to find it
I'm getting 8.82 on the ground rail
found it!!!!
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.
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
The volt-drop through the 33R resistor is back.
What voltages do you get without the MN3007 installed?
getting a little effect not much.
If i unhook vibe switch gose dead
8.39
do you think it is the mn3007?
i got the mn3101 off ebay too
I put chip back in
7.20 but it keeps dropping evry second or 2
Quote from: whomeno on October 20, 2018, 08:05:29 PM
I put chip back in
7.20 but it keeps dropping evry second or 2
That is most likely the TL022 LFO causing that - nothing to worry about.
Opening the vibrato switch and loosing any audio means that the MN3007 is not actually doing anything. The volt drop is the most worrying. A working MN3007 simply does not normally consume anywhere near enough current to cause that amount. You could just try another test which is to put the chip back in, set the rate and depth to mid-range but leave the vibrato open. Run a signal into the effect and have an amp connected. Now slowly adjust the trimpot. If its going to work, it will do something.
Your voltages even with the volt drop are what is expected with the 9V rail low at 6.6V - won't work correctly but it will do something if it is a real MN3007 (seriously doubt that it is).
I do recommend that you replace both ICs with new ICs from Smallbear.
I have got some fake MN3007 myself and they behave exactly as what you have experienced. But I have never received a fake MN3101 clock chip.
with out 3007 in
IC 4558
1=5.8
2=5.84
3=5.83
4=0
5=5.84
6=5.84
7=5.83
8=8.39
IC2 TL022
1=.63
2=5.84
3=4.82
4=0
5=5.84
6=.64
7=7.77
8=8.39
IC3 mn3007
1=8.39
2=5.06
3=5.05
4=.55
5=0
6=4.84
7=8.34
8=8.34
IC4 mn3101
1=8.39
2=4.84
3=0
4=5.05
5=.94
6=6.84
7=2.50
8=.55
Q1
E=4.65
B=5.04
C=8.39
Q2
E=8.39
B=5.58
C=5.06
Q3
E=4.72
B=5.15
C=8.39
Q4
E=0
B=.64
C=2.05
Q5
E=6.67
B=7.14
C=2.05
put chip back in left switch out adjusted trim pot both ways nothing
Looking bad for that BBD chip.
One more quick test. Leave the chip out, open the vibrato switch and then touch a 100n capacitor across pins 3 and 8 of the MN3007 socket.
You should hear some audio going through if the audio circuits are OK.
ok that worked had audio.
Sent seller a nice message.
will get both from small bear
Ummm...
Before leaving negative feedback wait until you get the chips from Smallbear and try them.
Smallbear is very quick with despatching orders so from New York you shouldn't have to wait too much longer to get the effect to go.
no feedback left. sent message to seller. he had taken the add down.
will work with him before feedback .always do.
that is where this chip came from NY oeanside
mail 10/10 got it today 10/20.