Maker Pro
Maker Pro

circuit board testing ?

cwb

Apr 18, 2012
31
Joined
Apr 18, 2012
Messages
31
Pin 3 & 5 = 1580 R =1083

D2 = 547 R nr

D5 = 299 R 299

D7 = 546 R nr

On CZ 1,2.3 buzz, R buzz
 

KJ6EAD

Aug 13, 2011
1,114
Joined
Aug 13, 2011
Messages
1,114
And another optocoupler (Sharp PC817), U6 pins 3 & 4.
 

KJ6EAD

Aug 13, 2011
1,114
Joined
Aug 13, 2011
Messages
1,114
I don't like the reading on D5 but it could be an in circuit effect. Can you unsolder and lift one lead to isolate it and test again?
 
Last edited:

cwb

Apr 18, 2012
31
Joined
Apr 18, 2012
Messages
31
D5 = 556 R nr

Scr 1 & 3 = 206 R = 207

1 & 2 = nr R = nr

2 & 3 = nr R = nr
 
Last edited:

KJ6EAD

Aug 13, 2011
1,114
Joined
Aug 13, 2011
Messages
1,114
I've been reviewing some of our earlier results. Can you unsolder the SCR and test it again out of circuit?
 

cwb

Apr 18, 2012
31
Joined
Apr 18, 2012
Messages
31
Think I edited my post a bit late :)

Scr 1 & 3 = 206 R = 207

1 & 2 = nr R = nr

2 & 3 = nr R = nr
 

KJ6EAD

Aug 13, 2011
1,114
Joined
Aug 13, 2011
Messages
1,114
There are a few more components to check but I can't read the identifiers on the silkscreen so I'll have to download one of your photos and draw circles around them.
 

cwb

Apr 18, 2012
31
Joined
Apr 18, 2012
Messages
31
There are a few more components to check but I can't read the identifiers on the silkscreen so I'll have to download one of your photos and draw circles around them.

Is there a part of the board in particular that I could try and get a clearer photo, or from a different angle.
 

KJ6EAD

Aug 13, 2011
1,114
Joined
Aug 13, 2011
Messages
1,114
Yes. The same area covered in photo six in the first set of ten. It just needs better light and focus at the board level. There's a three-terminal device in a TO-220 package and what look like two bridge rectifiers that I'd like to identify.
 

KJ6EAD

Aug 13, 2011
1,114
Joined
Aug 13, 2011
Messages
1,114
You need to do the same kind of test as before on another large bridge rectifier (BR3), a small round one (BR2) and a voltage regulator (U4).
 

cwb

Apr 18, 2012
31
Joined
Apr 18, 2012
Messages
31
U4
1&2 =574 R =nr
1&3 =544 R =nr
2&3 =nr R = nr

BR2 pins facing down, + as No.1 reading clockwise
1&2 =537 R =nr
1&3 = 570 R=nr
1&4 = 537 R=nr
2&3 = 538 R= nr
2&4 =nr R = nr
3&4 =nr R =537

Will do RB3 next
 

cwb

Apr 18, 2012
31
Joined
Apr 18, 2012
Messages
31
Afraid I've not had much time to look at this but hope to get back to it soon.

I moved house and had loads of work to do on the new place

I've tried to pm you KJ6EAD, not sure if message sent or not.
 
Top