Sega G-loc deluxe motor power supply

[perjmolsen]

Hi

Just an update of repairing my 2nd PCB -

I have all the required voltages - but no movement at all when it is mounted in Gloc.
Therefore the problem must be in the control logic part, and having no oscilloscope and do know how to use it - then i have tried to find another way to diagnose the no movement issue.

I have tried to measure  the PC910's on the PCB,  by measuring ohm,s between the annode (leg2) and cathode (leg3)


The following PC910,s i am unable to measure any ohms between PC2,PC3,PC4



So i have ordered some new from this seller
https://www.aliexpress.com/item/10PCS-PC910-DIP8/32407984936.html?spm=2114.01010208.3.1.qwq8KF&ws_ab_test=searchweb0_0,searchweb201602_3_10065_10068_433_434_10136_10137_10138_10060_10062_10056_10055_10054_302_122_10059_10099_10103_10102_10096_10052_10053_10050_10107_10051_10106_10084_10083_10080_10082_10081_10110_10111_10112_10113_10114_10037_10078_10079_10077_10073_10070_10122_10123_10126_6000000_10124-10037_10077,searchweb201603_7,afswitch_1,ppcSwitch_5,single_sort_0_default&btsid=a1db6fc0-cae5-44ab-ab65-dfbdef414702&algo_expid=ae35951f-36ee-4d26-8c44-48cd8fa1062e-0&algo_pvid=ae35951f-36ee-4d26-8c44-48cd8fa1062e

I hope that brings me closer to movement

Do i have overlooked something else? (what says GC339?)    

[perjmolsen]

Hmm... I wonder if GC339 has left the planet 

I do not hope that my questions has scared him 

I need his expert advice 

Kind regards
Per

[perjmolsen]

Hi

A small update

Second powersupply(the one where all the volts are OK):

I have changed the three PC910 optocuplers and still bo movement when i mount it in the g-loc. (so i do not think that the old ones where defective at all)

If i make a motor test then there is some static on the screen and a small humm but no movement at all.
I have also changed the two caps at C36 and C18

Does anybody have expirenced the same when they had restored a powersupply?

First powersupply (the one where I burned the L2 transformer):
I have made a deal at a chineese company at alibaba.com, I have send the defective L2 transformer, PC2019 to china and they have made 10 new L2 transformers and shiped them yesterday, only 17 dollars, so hopefully when they arive i can get to work on that powersupply also.

[perjmolsen]

Hi

Whuu  A GIANT step for me!

I finally got some movement, I have changed ZD6 and ZD7 with some new 16V zener diode (the old ones where shorted)

Now i have movement, but it stays in upright position in that side where i have mounted my repaired powersupply. The other side does self test ok up and then down.

I have checked that the switches are OK - also if i switch the powersupplys the problem moves to the other side.

So there must be something that controls down movement in the powersupply... but where 

[perjmolsen]

YES! AT LAST!!! 

ZD11 where the reason for the missing down movement! -> It where shorted!
I changed that to a new one, and FINALLY after nearly 3 years without movement IT MOOVES!! ITS ALIVE!!! 

Check it out here: https://www.dropbox.com/s/xo8k730kgn03095/Gloc_working_2017mp4.mp4?dl=0

The funny thing is that the power supply that i have rebuild is faster in movement than the other one, but you do not notice it when the game plays, only in test mode.

--
Then i just wait for the Chinese to send me some new L2 transformers.. then i might also be able to rebuild the first power supply where i fried the L2 transformer.. then if i am so lucky i have a repaired spare 

[Vieille_Loutre]

great job ! it's really beautiful to see a such amazing cab comming back to life... and your cab looks great! show us more! :p

[perjmolsen]

Hi

Thanks for the nice words, i will find some pictures of the restoration process,and post them.
If someone also need to replace the L2 transformer on the PCB, then here is the specification for it.

I am waiting for 10 L2 transformers to arrive from china, then i will attack the two last power supplys that i have, hopefuly i can restore them also, now i have a better understanding of that electronics ( I hope)  or just pure luck

The spec document can be downloaded here https://www.dropbox.com/s/nhiun74mj9whwna/K352%2BPQ20169Y17%20Mingyuda.pdf?dl=0

[Little_Rabbit]

Hi,

Thanks for sharing with us your success and your joy !

It's really great to see such a kind of simulator working again  !

Thanks also for your offer about the extra inductors L2 !

[perjmolsen]

Thanks - but....

yesterday when i where playing.. suddenly a burning smell




It seems that it is due to a bad connection



But i have no 5V at IC2, leg 8 - I have changed the L7805 at IC1. And there is 7V at D3
All the other volts are present, I have to dig into it...

UPDATE: I think that i have traced it to that the "upper" connection on IC1 at the middle leg is not connected - this is the input from D3... so therefore no 5V output.
Ill keep you updated when i get it fixed

[perjmolsen]

HI

An update - it where just some bad connections, now 5V are present - and i have re tested all the other volts one more time. Tested in the Gloc and everything works 

Hopefully it stays that this time

[perjmolsen]

Whuu..

Just an update

I just had recived the 10 L2 transformers from china




Now i can get to work restoring my last two powersupplys so if all goes well i have two spares