Main Restorations Software Audio/Jukebox/MP3 Everything Else Buy/Sell/Trade
Project Announcements Monitor/Video GroovyMAME Merit/JVL Touchscreen Meet Up Retail Vendors
Driving & Racing Woodworking Software Support Forums Consoles Project Arcade Reviews
Automated Projects Artwork Frontend Support Forums Pinball Forum Discussion Old Boards
Raspberry Pi & Dev Board controls.dat Linux Miscellaneous Arcade Wiki Discussion Old Archives
Lightguns Arcade1Up --- Bug Reports --- Site News

Unread posts | New Replies | Recent posts | Rules | Chatroom | Wiki | File Repository | RSS | Submit news

  

Author Topic: Hantarex polo 25-28 No brightness control (SOLVED)  (Read 520 times)

0 Members and 1 Guest are viewing this topic.

perjmolsen

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 428
  • Last login:June 29, 2020, 06:51:09 am
  • I want to learn, and try.. I NEWER give up :)
    • My gameroom
Hantarex polo 25-28 No brightness control (SOLVED)
« on: January 26, 2020, 04:50:50 pm »
Hi  :cheers:

Again a Hantarex Polo trying-to-fix

My Hantarex Polo has no Brightness control, nothing happens at all when I turn the brightness pot.
Also when the picture changes between black and white, the picture gets nearly all white, and then normal "black" again.

R240 a 180K resistor where OL, changed it to a new 180K but still no brightness control, I checked the resistor afterwards and it is still OK.
D401 is OK

What am I missing?  :notworthy:
« Last Edit: January 27, 2020, 06:35:34 pm by perjmolsen »

princess prin prin

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 215
  • Last login:Today at 01:13:53 pm
  • intrinsically safe
Re: Hantarex polo 25-28 No brightness control
« Reply #1 on: January 27, 2020, 05:55:39 am »
Check the other parts in the beam current limiting circuit starting from pin 7 of the flyback: R232, C176, D150, C180 and R233, R239, R240.

perjmolsen

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 428
  • Last login:June 29, 2020, 06:51:09 am
  • I want to learn, and try.. I NEWER give up :)
    • My gameroom
Re: Hantarex polo 25-28 No brightness control
« Reply #2 on: January 27, 2020, 05:55:56 pm »
HI  :notworthy:

I have checked them all out of circuit including R238, all tested as in spec  :dizzy:

The only components that where a bit off where the two caps
C176   100nf 250v replaced with a new 104J 250V poly cap
C180   10n 630v replaced wit a new 103J 400V poly cap

Still no change in brightness when I turn the pot on the remote board.

I have made a small video of the brightness issue when the picture changes



« Last Edit: January 27, 2020, 06:33:34 pm by perjmolsen »

perjmolsen

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 428
  • Last login:June 29, 2020, 06:51:09 am
  • I want to learn, and try.. I NEWER give up :)
    • My gameroom
Re: Hantarex polo 25-28 No brightness control
« Reply #3 on: January 27, 2020, 06:35:17 pm »
Well....  :o

Now it is fixed........  :banghead: :banghead:

The only thing that I not did test where the pot it self.... sure that where the issue....!

So funny how things work if a new one is put in....  :laugh2:



Now time to  :cheers:
« Last Edit: January 27, 2020, 07:39:16 pm by perjmolsen »

MKFan4Life

  • Trade Count: (+2)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 268
  • Last login:August 27, 2020, 12:15:51 am
  • My arcade machines...
Re: Hantarex polo 25-28 No brightness control (SOLVED)
« Reply #4 on: March 22, 2020, 03:12:17 am »
Congrats on the fix. As I was reading I was like, is he going to check the pot itself? Lol! Glad you fixed it up!