nanao sanwa schematics

[Franck 78]

Hi,

Schematics available are not easy to read. Poor repro often but also spaghetti style

I have redrawn the Sanwa PM1745 from a board and one barely usable schematic. My drawing probably have some errors in it and need review.

It is KiCad 5.1 style and is available on github

I did the same for NANAO MS8-29 , only from the board this time. So this one really need some double checking.

I see there is a MS9-29 schematic in four part, acceptable. I think I will do it too.

But the real thing someone ask me to do is the MS2930. No any schematic, lot of components, this one is difficult and I would like some help.
I would like to have the component list done before drawing anything.
I don't have a board to dismantle, and with SMT , a lot of cap will be removed for measuring them.
Volunteers ?


https://github.com/Franck78/SANWA-PM1745
https://github.com/Franck78/NANAO-MS8_29

 

[trashedcabs]

This is incredible work. I have an MS8-29 I'm working on right now and it's already helped me fix a protection fault. Now it has a strange jittery SPC/H Size fault I am trying to hunt down.

I did find these differences on the MS8-29 schematic:

R465 on my board is a 390ohm
VR434 on my board is labeled "34". I assume 30k as it measures 25k.
R442 on my board is a 1.2k
C550 and C551 are 2700nF, not 270nF
C533 on my board is not populated, nor is Q531, R535, Q535, R545, R537
R541 is 27ohm, not 2.7k
C554 on mine is 270nF

 

[Franck 78]

Hi,
happy this helped you.

R465 so low makes no sense with the 30k pot. Recheck ?

vr434 yes 30K
R442 I have 2K2, need other inputs .....

C533 and others: the purpose of this is adding or not some nanofarad to C532. Strange you don't have that, or C533 is higher ? Or you don't have 15/24 switching?

my C554 is 390n not 330n as I said. But not 270n !

Other values are miss-readings, fixed !

 

[trashedcabs]

Hi,
happy this helped you.

R465 so low makes no sense with the 30k pot. Recheck ?

vr434 yes 30K
R442 I have 2K2, need other inputs .....

C533 and others: the purpose of this is adding or not some nanofarad to C532. Strange you don't have that, or C533 is higher ? Or you don't have 15/24 switching?

my C554 is 390n not 330n as I said. But not 270n !

Other values are miss-readings, fixed !

R465 is orange white brown and measures 390 out of circuit.

My chassis does switch 15/24 by moving the jumper. C532 is 8.2nF same as listed. Not sure why this whole circuit is missing on mine but seems to be connected to H Phase which is working fine.

Oh yes, also. C446 on the schematic is listed as 4.7uF NP. On my chassis and on all the other cap lists online, it is 33uF NP.
C447 also should be 47uF

 

[Samurai_j]

Thank you for the Pm1745 schematics . Got 4 of these fuckers, almost gave up on the repairs.

 

[twon]

If your attampting to redraw the schematic for a ms 2930, Please let me know what you need as i would love to help out anyway i can. This would be a great piece of info to finally have so that these chassis could be alot easier to repair.

Tony