Hi Tibal

Just a small update - I have swaped GAL16V8 (IC4) between the good and the bad driver board, it id not make any diffrence at all. still only the one segment lights up, and after a while it displayes 22.
I also noticed when the steering test run's the wheel goes from left to right and center - then slams hard right and its hard ti turn back to center.

So I am waiting for the is's in my last post then I will change them. Whish me luck
Ill keep you updated.

Kind regards
Per Olsen

Hi Tibal

Thanks for your fast reply 
I will do as you mention, and let you know my results

Hello Tibal

I have found your great repair guide - I have a driveboard in my Scud race twin that need som love.

My issue is that durring boot if the game the wheel tries to turn, but slams to the right and does not center.
The games playes as normal but witout force feed back.

I have swaped the driveboard between the two cabinets, and the problem follows the drive board.

If I look at the driveboard segments, only the two of the four lights up. ?

The two segments that lights up displays 22.

So my plan is to follow your guide and change
1. change the four 74HC373 - and test the board
2. change two 74HC244 - and test the board
3. change the one 74HC139

Do you agree in my plan, or have some great tips (I do not have an IC tester - so I just have orderd some new IC's)

Note For a year ago I repaired the same drive borad it had er02 - then I replaced IC9 and the board played fine)

Here is a video of the driveboard booting https://youtube.com/shorts/tqnB6d_HC44

Thanks that you share your great work!

Kind regards
Per from Denmark

Hi

Oh GREAT to hear that it where the issue 

I hope that you find a motor control board 

Kind regards
Per

Hi

I had the same issue, it where R1 and R2 that where bad.
As I recall I where unable to read the resistor fault with my multimeter, R1 and R2 failed only under load.
When I replaced them I used 1.2ohm 10W resistors (orginal it where 5W)

Hi

Just a small update to the repair log, there is a typo R24 is a 2.2ohm NOT a 220 ohm

https://www.dropbox.com/scl/fi/jdwr58zhg2tofkmensh2q/Nomenclature.ods?dl=0&rlkey=tm49vx0ax3kz10vesr5eg5ngx

Hi

If someone needs the eprom code for the eprom that is located on the motor driver board.
Then I have made a dump of my eprom

https://www.dropbox.com/s/87oitu23utdpemj/Sega-gloc-motor-eprom-tms27c256.zip?dl=0

It need to be burned on a 27C256 eprom.

Kind regards
Per

Hi

Super that the G-loc is back to life
I am glad that my L2 transformers worked. 

Also great with all the fine detail in the restoring process, that might be handy to know someday 

Kind regards
Per

Hi corner-tech

Some new status?   
Are the g loc up and running ?

There is two MK48Z02B15 cmos/batterys who stores informarion.

Expected lifespan 7 years. I have orderd some new here

DKK 176.00 | Free shipping 5pcs/lot MK48Z02B-15 MK48Z02B-12 48Z02B-20 DIP-24 CMOS 2K x 8 XEROPOWER SRAM MK48Z02B15 Goodquality
https://s.click.aliexpress.com/e/uxMSde0

Another thing - after i have reset all the options in the menus i do not longer get the ADSP error at startup?!?!?
https://www.youtube.com/watch?v=uAChM4-dc2s

So definitely I need to fix red color now 

Well some status - it seems that i can test the ADSP board in the test menu, so i have tested it - but impossible to see anything without the red color.


So i think that i need to fix the red now

Hi

Thanks - I hope that i can find out why the ADSP board is not working.

My best guess at this time is to change the caps at the  APU PCB - it gives the main PCB its +15V, -21V.
I do not know if the fault is at main pcb or the ADSP pcb.. but i am thinking that it is the adsp board, because of the missing led's

As I could tell the caps i changed at the three "game boards" where the original ones from 1989 - so It might be a good idea to change all caps on the other boards too

I have some more Documentation here if you can use it

Initervideo chassis manual: https://www.dropbox.com/s/kwo09b1czykv5i1/intervideo_vp_series.pdf?dl=0

Operators manual for the game: https://www.dropbox.com/s/divndktf7qchn6u/Hard%20drivin%20operator%20manual.pdf?dl=0

Hi

I have a Hard Drivin upright that i am trying to restore

I now have managed to get the screen working (Intervideo chassis) - the issue where just some bad solder joints.
I still need to have the Red color fixed, and a new capkit.


Now i can see what the game does at startup, so before i put more energy into the monitor, I want to get the game working

When i power it on it first says that brake pedal is out of adjustment, but I can turn key to continue.

Then I get this message "ADSP timeout error"
A small video https://www.youtube.com/watch?v=XgESNbozNaw


If i look at the diodes at the PCB the most of the lights lights up, but no light in the middle PCB does not light up at all, and that is the ADSP board, if i test the 5V at the 5V test point at the board it is 5.3V

A small video https://www.youtube.com/watch?v=F-KDC2oGU_I

Things i have done
1.I have put in a new 10A power supply for the 5V, and adjusted the volts so that i have 5.3V at the 5V test tabs on the board.
2. Replaced all the caps on all the game PCB's -> my log can be found here https://www.dropbox.com/s/0n1nutecz4...0log.xlsx?dl=0
3. Cleaned all the socketed chips on the boards.

A note regarding the new power supply - according to the documentation i can find, there must be two sense wires (red/stripe and brown/stripe)
All my wires are red or brown with no stripe, so i have connected them all to the new power supply.

Documentation http://www.jmargolin.com/schem/HardDrivinSchem.pdf

If I test the 12V at the testpoint at the multisync pcb I get 11.5V a little low - I do not know if the ADSP board uses 12V? - there is no 12V test points at the ADSP board.

Do you know where to look to get the ADSP board working, get the LED's to light up? - if you do give me a ping

Citation de: corner-tech le Dimanche 03 Mars 2019, 12:09:07 PM

In summary, it seems that the L2 transformers from Per are good 
Thank you again, Per, for getting the transformers made and sending some to me. I can't thank you enough 

The golden rule is to check the filter capacitors, or just replace them if there is any doubt. I found out the hard way, and spent a lot of time looking for a problem which turned out to be quite simple 

It might be worth checking or replacing all of your small electrolytic capacitors (eg. C13, C28, C30, C25, C26, C27, C19, C20, C21, C36, C18), it might solve (or prevent) all sorts of strange problems 

Next step is to put the triac back in, as well as the OP-AMP and 5V regulator for the logic circuits.

Cheers for now.

Hi

Whau - nice job  and I am happy that my L2 transformers are working 

I have just looked in my excel sheet from when I tried to use one of my L2 transformers, an ran into the problem with low 15V.
As i can see I had changed C28 and C30  them to new 47uf... but I need to check visual at my two "spare" power supplys, if I have mounted 4.7UF... I can be... 

Nice work restoring! - also all your super discovery If just I know how to use an Oscilloscope 

Hi

I told them that the 15v where low, but i do not know what they have changed, I also asked them for the datasheet for the new ones but i newer got it.

They wrote that they have changed the number of windings on the 15v side.