Search found 15 matches

by stromar
Sat Aug 04, 2018 12:26 pm
Forum: DSO 068
Topic: power suply bob4
Replies: 15
Views: 10309

Re: power suply bob4

I got from you new bob 3 board and i soldered it on the main board.
Vbus 5.07
V+ 4.901
Bob3 in 4.901
Bob out 0.000

Ok what now this is realy disturbing becose we changed bob3 board and now the same shit

Jp2 is open if i close jp2 then everthong is working

What now
by stromar
Mon Jun 04, 2018 6:04 am
Forum: DSO 068
Topic: power suply bob4
Replies: 15
Views: 10309

Re: power suply bob4

I have
C6 1pF value of capacitor
C4 3pF value capacitor

can i change C4 ( as changing C6) capacitor for 2 pf or 4 pf, becose i dont ow if femto farad capacitors exsist?
by stromar
Mon Jun 04, 2018 5:56 am
Forum: DSO 068
Topic: power suply bob4
Replies: 15
Views: 10309

Re: power suply bob4

viewtopic.php?f=19&t=1108

( is this taht post you wont to llook)
by stromar
Mon Jun 04, 2018 5:47 am
Forum: DSO 068
Topic: power suply bob4
Replies: 15
Views: 10309

Re: power suply bob4

I loket at the bord, on my bord there is place for c3 but fizicaly c3 condenser s not there what this mean. There is empty space on that place.

What now?
by stromar
Mon Jun 04, 2018 5:28 am
Forum: DSO 068
Topic: power suply bob4
Replies: 15
Views: 10309

Re: power suply bob4

Where can i get this Calibrating C5 and C3. On forum. I loked i didnt found it.

Can you post a link.

Thanks.
by stromar
Fri May 25, 2018 7:15 am
Forum: DSO 068
Topic: power suply bob4
Replies: 15
Views: 10309

Re: power suply bob4

Hy I desoldered, cleaned, and looket at conections terminals and parts via magnifeing glass. I didnt fount nothing strange i dont now. I solder it again and the same thing. Board is dead. I mesured voltage on bob4 junktion (in) is 4.90 but on bob 4 junktion (out) is only 0.30 v. so somthing isnt ok ...
by stromar
Sat May 19, 2018 6:28 pm
Forum: DSO 068
Topic: power suply bob4
Replies: 15
Views: 10309

Re: power suply bob4

Hy i closed jp2 lcd is working presing buton saunds the beep Vbus 4.55 JP1 4.20 JP2 4.2 VS+ 4.20 +5V 5.02 JP4 5.02 JP7 5.00 JP9 0 BOB3 in 4.20 BOB3 out 4.20 BOB4 in 4.20 BOB4 out 5.0 So then is problem in BOB3, shoud i resolder it and solder it back again. Or i order spere part from your companywait...
by stromar
Mon May 14, 2018 2:38 pm
Forum: DSO 068
Topic: power suply bob4
Replies: 15
Views: 10309

Re: power suply bob4

jp1 4,91
jp2 one side 4.81
other side 0.22

jp4 0.55
jp 7 0.55


ok this are voltages at teh junktion,..

Can sombody tell me what is wrong,.. becose inthe manual writes taht is somthing wrong with bobo 3 and bobo 4 i didnt tuch them ,..


Thank you.
by stromar
Mon May 14, 2018 2:31 pm
Forum: DSO 068
Topic: power suply bob4
Replies: 15
Views: 10309

Re: power suply bob4

BOB3
in 4.91
out 0.22

BOB4
in 0.22
out 0.55

This is voltagemesured from bobo 3 and bob 4 to reference point

So eny sugestions,...
by stromar
Mon May 14, 2018 2:24 pm
Forum: DSO 068
Topic: power suply bob4
Replies: 15
Views: 10309

Re: power suply bob4

I finisched power step 2 and went to power step 3, then i cnaged capacitors c5 and c8. Now i went to check NO POWER usb powered ok 5.08 VBUS ok? ok 4.9 V+ ok? ok VS+ok? nok 0.22 +5V ok nok 0.58 BOB 3 and bob 4 is instaled jp1 is closed jp2 is open jp3 open jo7 closed jp9 closed sw12 dont blink lcd d...