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Author Topic: scud race / nanao ms9-29su missing a color (SOLVED)  (Read 1776 times)

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perjmolsen

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scud race / nanao ms9-29su missing a color (SOLVED)
« on: November 15, 2018, 01:50:42 pm »
Hi

Well  I thought it was an easy fix.. but no  :'(

I have a scud race with an chassis it should be a nanao ms9-29su

I am missing a color, the picture has a lot of red color
I have checked the tree transistors C4001 at the neck board they are all OK.

(I have removed them from the neck board and tested them with my multimeter.)

Hopefully someone (grantspain - the all mighty chassis superman  :applaud:) can give me a hint to the next step...
« Last Edit: January 18, 2019, 05:13:36 am by perjmolsen »

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Re: scud race / nanao ms9-29su missing a color
« Reply #1 on: November 15, 2018, 01:51:41 pm »
The neck  board

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Re: scud race / nanao ms9-29su missing a color
« Reply #2 on: November 15, 2018, 01:52:30 pm »
Chassis

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Re: scud race / nanao ms9-29su missing a color
« Reply #3 on: November 15, 2018, 02:02:32 pm »
Chassis model

grantspain

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Re: scud race / nanao ms9-29su missing a color
« Reply #4 on: November 15, 2018, 06:00:11 pm »
zener

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Re: scud race / nanao ms9-29su missing a color
« Reply #5 on: November 16, 2018, 02:44:25 am »
Super

I will check them :)

Do you know where to find a parts lists? so that i can replace the zener diode with the correct volt

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Re: scud race / nanao ms9-29su missing a color
« Reply #6 on: November 16, 2018, 03:49:48 am »
if you locate the green drive transistor and track back you will find a 15v zener in that circuit, they do not always read bad but break down under load- i can't remember which location that one is but i am sure you can find it
other things that cause this are the two small transistors in that same circuit

there are other things that can cause this but i would look at the zener and transistors first- swap them from one of the other colour circuits if need be

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Re: scud race / nanao ms9-29su missing a color
« Reply #7 on: November 16, 2018, 03:53:37 am »
Super !
You are the chassis superman  ;D
I will check and let you know.
Thanks one more time :)

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Re: scud race / nanao ms9-29su missing a color
« Reply #8 on: November 16, 2018, 10:19:23 am »
Hi

I have now tested the Zener diodes ZD301 Z311 ZD321 in circuit with my multimeder, they all test the same value.
I have also tested the color drive transisters Q302 Q312 Q322 in circuit with my multimeder, they all test the same value.
Also the Resistors R306 R316 R326 they also test OK in circuit.

But I am thinking to swap one transistor first, then test to see if i am missing another color, if not swap a zener diode, or just replace the one at the blue color

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Re: scud race / nanao ms9-29su missing a color
« Reply #9 on: November 16, 2018, 03:23:34 pm »
out of interest locate the green cut off pot on the main chassis and crank that up- see what happens

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Re: scud race / nanao ms9-29su missing a color
« Reply #10 on: November 16, 2018, 04:16:10 pm »
HI

I have now switched one of the transistors, still the same issue - no green.
If I turn up the green cut off nothing happens.
I have tried to momentary touch the green gun with a wire from the chassis ground, and the picture got green - so it is not the monitor.

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Re: scud race / nanao ms9-29su missing a color
« Reply #11 on: November 16, 2018, 06:35:44 pm »
what you can do is swap the red and green wires on the connector to the neck card, this will prove if the neck card or the main chassis have the fault- just to narrow it down
there is also a metal oxide resistor on each colour line on the neck card, acts as safety resistor

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Re: scud race / nanao ms9-29su missing a color
« Reply #12 on: November 17, 2018, 03:48:43 am »
HI

I have messed up...!

Accidentally i swapped the wrong wires... :banghead: :banghead: :banghead:

I swapped the nr 2 and 3 wires at the picture below, a small pop... and when i looked at the screen just black..
Turned them around again.. still noting..

I might have blown som-ting up  :banghead:

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Re: scud race / nanao ms9-29su missing a color
« Reply #13 on: November 17, 2018, 05:09:04 am »
Hi

Just trying to find what i have f.. up when i turned the wrong wires at the neck board. Thinking working my way back from the connecor where the way to go

If I test the transistor Q503 a A1020 PNP transistor in circuit i get the following

B->E = OL
B->C = OL
E->B = 0,6
C->B = 0,6
C->E = 0,124 must be OL right

So can i assume that the A1020 is dead?  I do not have any A1020 transistors in my parts
But if i look at the datasheet https://www.onsemi.com/pub/Collateral/2SA1020-D.PDF

It is a 50V at collector and 5V at base i have some A733 https://www.voti.nl/docs/A733.pdf
Can that be a replacment ? or is it best to get some A1020


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Re: scud race / nanao ms9-29su missing a color
« Reply #14 on: November 17, 2018, 05:13:31 am »
it looks ok to swap, btw that the heater and 200v connector- the colours are the other connector so no wonder it went pop

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Re: scud race / nanao ms9-29su missing a color
« Reply #15 on: November 17, 2018, 05:17:29 am »
OK super

I will pay MORE attention next time.. why i did it. i do not know.. a minute os not thinking... :banghead:
Yesterday i measured at the other connector, so why the heck i swapped the wrong wires today...

I will change the transistor and double check and tripple check from now on  :)
Let us pray that i not did f.. anything up beside that transistor
« Last Edit: November 17, 2018, 05:34:37 am by perjmolsen »

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Re: scud race / nanao ms9-29su missing a color
« Reply #16 on: November 17, 2018, 05:45:55 am »
I do not think that it where the A1020 that had gone bad.

When i have removed it from the chassis.
the C->E test OL and not as short.


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Re: scud race / nanao ms9-29su missing a color
« Reply #17 on: November 17, 2018, 05:52:42 am »
i would expect an open circuit resistor, these chassis had lots of protection resistors

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Re: scud race / nanao ms9-29su missing a color
« Reply #18 on: November 17, 2018, 06:05:32 am »
if i track down the print path from the connector (pin 3 at my picture)
I can track it down to the diode in location D955 it gives some strange readings in circuit, so i will try de remove it and test that also.
If not the issue, I will lok for open resistors

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Re: scud race / nanao ms9-29su missing a color
« Reply #19 on: November 17, 2018, 06:15:18 am »
By swapping the wires that you marked as 2 and 3 you shorted the heater voltage line to ground. That has nothing to do with that transistor you're checking. It's a DC voltage from the power supply with a fusible resistor in series, R532 behind the flyback. It's a fusible resistor that is now probably blown so check it out and see if you have voltage (6-7Vdc) on one leg and not on the other.

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Re: scud race / nanao ms9-29su missing a color
« Reply #20 on: November 17, 2018, 06:51:48 am »
Just tried it :)

At one end i got 0.005 V at the other end 07.88V
So its dead ..

Having trouble read the colors...

Brown - black - gold - gold?

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Re: scud race / nanao ms9-29su missing a color
« Reply #21 on: November 17, 2018, 07:00:38 am »
1 ohm but i have marked as 1.5 ohm in the manual, 1 ohm would do perfectly though- it must be a fuse type/ metal oxide

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« Last Edit: November 17, 2018, 07:56:47 am by perjmolsen »

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Re: scud race / nanao ms9-29su missing a color
« Reply #23 on: November 17, 2018, 08:00:37 am »
you could use 1r2 as they are more widely available, you can get them on ebay

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Re: scud race / nanao ms9-29su missing a color
« Reply #24 on: November 17, 2018, 08:10:25 am »
I have found this bag of resistors in my parts

Its a metal resistor, on the bag it says 1.5R
But if i test it in my meter i got 2.3 ohm

The colors I read as
Brown
Green
Black
Gold
Brown

Then it is a 15 ohm..
« Last Edit: November 17, 2018, 08:13:18 am by perjmolsen »

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Re: scud race / nanao ms9-29su missing a color
« Reply #25 on: November 17, 2018, 08:19:39 am »
looks like 4th bar is silver to me which makes it 1.5 ohm

try and see what happens, just make sure you have those wires correct

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Re: scud race / nanao ms9-29su missing a color
« Reply #26 on: November 17, 2018, 08:28:27 am »
Yes now i also measure it to 1.5 ohm - used another connector, i think that the high reading where the wires.
Yes the wires i turend the wrong way i have already changed back :)

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Re: scud race / nanao ms9-29su missing a color
« Reply #27 on: November 17, 2018, 08:29:53 am »
The MS9 manual available online (in a Sega driving cab manual) is of a version that has a Matsushita tube M68JUA068X. Other versions have a Toshiba or Hitachi tubes. The heater resistor depends on the tube type. If you have 1 ohm, better replace with the same value. Type is also important, i.e. don't use a carbon film resistor. The chassis has an optional solder pad for bigger resistors so you can use a 1W one like this:

https://www.tme.eu/gb/details/nfr1w-1r/fusible-resistors/royal-ohm/frn01wk010ja10/

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Re: scud race / nanao ms9-29su missing a color
« Reply #28 on: November 17, 2018, 08:58:08 am »
With the new resistor in place i got picture .. but only this :(
White one with lines across.... :cry:

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Re: scud race / nanao ms9-29su missing a color
« Reply #29 on: November 17, 2018, 09:23:57 am »
read resistor R519 4r7

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Re: scud race / nanao ms9-29su missing a color
« Reply #30 on: November 17, 2018, 10:02:00 am »
Whau... you are right again  8)

I have removed the resistor tested it and it shows OL

Now i have to dig in my parts to se if i can find a 4.7 ohm metal resistor.. Ill be back  :)

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Re: scud race / nanao ms9-29su missing a color
« Reply #31 on: November 17, 2018, 10:29:00 am »
Replaced the R519  resistor with this one, also a 4.7 metal resistor / but not as big in physical size.
Still the same white picture with lines on  :cry:


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Re: scud race / nanao ms9-29su missing a color
« Reply #32 on: November 17, 2018, 11:13:57 am »
not 4.7k, has to be 4.7r and also should be metal oxide
« Last Edit: November 17, 2018, 11:49:41 am by grantspain »

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Re: scud race / nanao ms9-29su missing a color
« Reply #33 on: November 17, 2018, 11:49:41 am »
Oh...

I have now changed the resistor to an 4.7R metal resistor

Nothing on screen now when i power it on / just black and the normal crackle sound...
It seems shorty after power up i can hear a faint click... only one
I have measured the volt at R532 there are still 7.88 V

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Re: scud race / nanao ms9-29su missing a color
« Reply #34 on: November 17, 2018, 11:50:43 am »
now try turning up the screen volts on the flyback

can you see any tube heaters?

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Re: scud race / nanao ms9-29su missing a color
« Reply #35 on: November 17, 2018, 11:58:23 am »
Hi

No neck glow.
Also tried to turn up the screen at flyback nothing on screen. :cry:
« Last Edit: November 17, 2018, 12:04:47 pm by perjmolsen »

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Re: scud race / nanao ms9-29su missing a color
« Reply #36 on: November 18, 2018, 03:01:30 am »
Do you think that i need to look after another chassis?
Strange with the correct resistor that i got nothing on screen.
The small clik after power up, can it be some sort of protection that it is kicking in?

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Re: scud race / nanao ms9-29su missing a color
« Reply #37 on: November 18, 2018, 03:57:07 am »
i would check the tube first with your working chassis

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Re: scud race / nanao ms9-29su missing a color
« Reply #38 on: November 18, 2018, 05:45:23 am »
Ok

I have tested with i china 25-29 chassis.  All connected but the rgb input. Turned up the screen on flyback.
Nothing on screen and no neck glow. So it seems that i have wrecked my monitor. Its an hitachi a68ksa30x. I might be able to get a monitor and chassis from a batte gear4 for free. Do you know if that will work?

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Re: scud race / nanao ms9-29su missing a color
« Reply #39 on: November 18, 2018, 06:05:14 am »
Well it should work but i need to know the exact make/model- it should be a toshiba digital

  
 

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