U3000

studiopaul

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im trying to repair my U3000

I have got my power supply repaired, and have re connected to the Deflection board.
The results or no result as the case maybe are no neck glow, no picture, no static sound charge from monitor! Dead.

So what ever took out power supply needs to be repaired on the deflection and or neck board. (power supply is new repair and outputting correct voltages)

looking at this trouble shooting guide.
http://pdf.textfiles.com/manuals/ARCADE/S-Z/U3000 Troubleshooting Guide [English].pdf

NO PICTURE/VIDEO

I want to start with the basics and using the Schematic began finding the components to test or replace. (im sure a cap kit will follow once working).

So...

Q102 = cant find??? (assume that this is in psu miss labeled?) is this correct???

T701 = (deflection board) flyback transformer

R802 = (deflection board) to the right of flyback 75K 1%

ZD500 = (P583 neck board) (connected to 22V) 9.1v 5%

C723 = (deflection board) .56 200V capacitor B testpoint? from LIN coil

Q501 = (P583 neck board) 2SC3782

T700 = (deflection board) transformer near test point B

R626 = (deflection board) Resistor .47 1/2W

CRT = found IT.

Do anyone have any other suggestions on where to start this repair? and any knowledge on Q102?

Once completed the first section of trouble shooting guide, I will move onto.....

NO POWER/DEAD

Q101 = (power supply) SSP6N60 334-1
Q108 = ?????????
Q102 = ?????????
Q701 = (deflection board) near test point B 321-1
Q700 = (deflection board) near test point B 177-1
C106 = (power supply) .1
IC U101 = (power supply) CS3842A
D106 =(power supply) D106A? D106B D106C 97-1
U600 = (deflection board) TDA1175

any suggestions from your experience?
 
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Good Job

im trying to repair my U3000

I have got my power supply repaired, and have re connected to the Deflection board.
The results or no result as the case maybe are no neck glow, no picture, no static sound charge from monitor! Dead.

So what ever took out power supply needs to be repaired on the deflection and or neck board. (power supply is new repair and outputting correct voltages)

looking at this trouble shooting guide.
http://pdf.textfiles.com/manuals/ARCADE/S-Z/U3000 Troubleshooting Guide [English].pdf

NO PICTURE/VIDEO

I want to start with the basics and using the Schematic began finding the components to test or replace. (im sure a cap kit will follow once working).

So...

Q102 = cant find??? (assume that this is in psu miss labeled?) is this correct???

T701 = (deflection board) flyback transformer

R802 = (deflection board) to the right of flyback 75K 1%

ZD500 = (P583 neck board) (connected to 22V) 9.1v 5%

C723 = (deflection board) .56 200V capacitor B testpoint? from LIN coil

Q501 = (P583 neck board) 2SC3782

T700 = (deflection board) transformer near test point B

R626 = (deflection board) Resistor .47 1/2W

CRT = found IT.

Do anyone have any other suggestions on where to start this repair? and any knowledge on Q102?

Once completed the first section of trouble shooting guide, I will move onto.....

NO POWER/DEAD

Q101 = (power supply) SSP6N60 334-1
Q108 = ?????????
Q102 = ?????????
Q701 = (deflection board) near test point B 321-1
Q700 = (deflection board) near test point B 177-1
C106 = (power supply) .1
IC U101 = (power supply) CS3842A
D106 =(power supply) D106A? D106B D106C 97-1
U600 = (deflection board) TDA1175

any suggestions from your experience?

By what you have done so far shows you are a thinker
and not expecting others to do everything for you when
its your repair..just by getting the ts chart.
also check older thread's for similar issues.


There are different power board use with the chassis
depending on the size of the tube..
because Q102 is used on another PS board
and maybe not the one you have.
And Q108 should be R108
showing it was written up wrong..

I always printout the list and add my own notes
so i'm ready for the next repair with notes of things
i forgot..or betters detail and corrections.
As you look it over you can do the same

careful with removing the plugs on this chassis to make
sure they are on the right connector when reinstalling them back.
get the correct chassis schematic and check the plug connector pins
are getting the correct voltage to them.
Is your B+ from the powersupply running at 120dc when its connected
to the chassis and is the 22vsdc at different Test point on the chassis
and have you check for any bad connections sometimes tapping on the chassis
will indicate the a bad connection too.
 
u3000

CRT measures 33 inches across diagonal.

Its a Hitachi Type A78LCU30X Serial: A0K000145
I am looking for documents for this tube and component changes to Deflection PCB/neck and psu.
I assume due to larger tube size they have modded with larger, higher rated components to handle the load.
anyone have any documents on this as not to follow the 27 inch version?

thanks
 
BUMP!

still looking for docs on the 33 inch replacement component values.. so i don't under rate circuit.

just checked psu unplugged.

Red cable = 25.8vdc
orange = 138.5vdc

I have removed deflection board and are tracing through schematics.
 
Wells doesn't even list a 33" U3000 on their site.

I've only ever seen 19" and 27" myself but who knows.

are you sure it's a U3000? cause the K8000 looks very similar
 
Got me scratching my head too..ive seen service manual for "Large Screen" ???
Heres pic of the boards..
the schematic looks like it fits the components on board placement...so assume it is the correct docs for u3000
 

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  • NECK BOARD.jpg
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looked at U3000 manual. sure enough, the headers match up. you got yourself a U3000.

not the first time Wells completely ignored models though. I know for fact they made a 27" U5000 cause I bought it off cadillacman.. but it's not listed.
 
He repaired my power supply!
i made the mistake of not sending him everything at once.

I do however, want to learn a bit more and trace the circuit some more before sending it out.
yes i like to torture myself
 
I have a u3000 33 inch monitor in my California speed deluxe cabinet. Its medium res. Had issues with it and sent it to chad. My issues were with power pcb mainly
 
I found very little and was so disgusted with it i sent it away. I think the only manual i found was the one from wells website.
 
Caps

Got me scratching my head too..ive seen service manual for "Large Screen" ???
Heres pic of the boards..
the schematic looks like it fits the components on board placement...so assume it is the correct docs for u3000


Under rate what? you havent found any defective parts yet..

P805 DEFLECTION BOARD

33K3301

every chassis gets the caps replaced first!!
do you need a schematic to find the caps on the board??
i found that 75% of the caps check bad on my last repair.
just replace the caps.
 
Well I cant see rating on the diodes on board too small.figured I should replace all caps..dont want to replace anything under rated for a larger 33 inch screen.
or you think the values on schematic for 27 inch screen will be ok?
meaning Voltage rating and current handling.

bob Robberts doesnt have kit for 33 inch u3000
 
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just caps

Well I cant see rating on the diodes on board too small.figured I should replace all caps..dont want to replace anything under rated for a larger 33 inch screen.
or you think the values on schematic for 27 inch screen will be ok?
meaning Voltage rating and current handling.

bob Robberts doesnt have kit for 33 inch u3000

Your over thinking now..

I would be using the 27 inch schematic

the big change would be some difference in the

yoke or HV retrace caps or different fly number

between the different chassis model which are written

on the deflection board.. P789 or P805

make sure you don't break the pins on the pin amp

transistor mounted on the metal frame or you'll need one

of them too.
 
Ok completed cap kit from Bob Roberts. (thank you Bob)

I followed all instruction and removed one cap at a time, replacing while taking note of the
polarity.
I see that some of his caps were rated with higher voltage ratings..but correct uf/mf ratings.

my power supply has been rebuilt and tested arcadecrt....

still no neck glow..dead monitor.
where would be the tell tell points to test..if the power supply has correct voltages?
probable faults to check..I.C or voltage regulators..transistors.

I have a trouble shooting guide..but no flow chart.
 
Q102, T701, R802, ZD500, C723, Q501, T700, R626, CRT

first on list!!



Ok measure the voltages on plug P150 from the Power supply board
???

Next measure the Plug P500 the plug by the flyback and record the voltages

so we can see whats missing?

odds are the voltages will be missing on the P500 because they come from

the flyback or a scan derived voltage..Measure the voltage on C808 a neg voltage

it should be missing if no High voltage from the fly...

Measure the voltages on the neck board..

the 3 large resistors should have about 120vs on them they are for the 3 cathode

of the crt and in this chassis the filament or hearter voltages come from the flyback

so odds are you have no high voltage..

Check the voltage at R626 both sides..

ZD500 is on the neck board not a suspect.

T700 maybe but i doubt it..

T701 maybe we will see?

Crt? for open heater i doubt it..

crack in neck board maybe but you should have HV working..

R802 not with no high volatge not a suspect but you can lift one end and

measure the ohms..

Not Q102 unless you have no B+ voltages..

Q501 a video amp trans not a suspect..

Q701 the horiz-drive trans could be a suspect..

measure the voltage on it?

you can leave the pin amp transistor off while TS the chassis

the transistor mounted to the heat sink its only for pincushion

not deflection and not needed if no HV while you are trouble shooting the

the chassis for HV..

make sure your yoke is hooked up and remote board.

I see you got these parts form the TS chart which is more like

a suspect chart not a TS chart..Let us know what you find..
 
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