Lumina - Blown Power supply

[stompstu]

Hi all
A friend has blown his lumina power supply.
(I think he connected the transformer wrong ;o(, putting 2400 volts into it insted of 24 )

I have checked it and changing the main fuse. but no success, looks as if there is a major problem.

I swapped the power supply with one from my star wars and the cell powerd up, so at least the damage has gone no further than the power supply.

Does anyone have a schematic to aid in me getting parts for a repair.
any help will be gladly apreciated in identifying the power rectifiers and transistors/components within the unit.

Regards
Stu

[Youngjedi]

It may be easier just to put in a new transformer... Slot Machines-Pachinko Machine Sales, Parts and Service

[stompstu]

The transformer is working fine,
The fault is on the power distribution card with the switch and internal fuses,
this ths the one to the bottom left of the lumina frame.

[compirate]

so are all the fuses ok?

[musky]

I believe there are red led's above the fuses to indicate that the fuse is ok

[stompstu]

yes all the output fuses are ok

The main input fuse keeps blowing even if all outputs are disconnected (CN2 & CN3)

There is a component on the board marked VRD1 was causing a short circuit, I removed this and tried again, all output LED lit up fine then something started to give a burning smell so I switched it off.

I guess there could be a fauty regulator or diode.

anyone know what the 5 legged transistor/diode are?

[musky]

Usually there is a varistor and /or diode that protect from over voltage/ reverse voltage faults. Most likely these are shot. I have a spare board lying around, I'll look and report back

[daverob]

I did sketch out a schematic for the PSU board a while ago, but I can't seem to find it at the moment.

VRD1 is a crowbar protection device, it is designed to permanently go short circuit if the input voltage is too high, this causes the fuse to blow faster and hopefully protect anything downstream from mistakes like this.

There are two other crowbar protection devices on the board (VRD2 and VRD3), these are on the output of the two switchmode regulator ICs for the +5v and +12v outputs, these are designed to protect the other circuit boards in the machine, and appear to have done their jobs this time ;-)

Next step is to check the bridge rectifiers on the heatsink, there are two of them one for the unregulated 28v supply for the lamps (B2) which leaves the PSU board via F5. The second one (B1) feeds the two switch mode regulators (an SI-8050S for the +5v rail and an NJM2367 for the +12v rail) and a second 28v DC supply for the motors and soleniods. Both switch mode regulators are laid out pretty much the same as the example circuits from the datasheets, so shouldn't be too difficult to understand.

Also check the PSU output voltages on CN2 and/or on the output fuses.

CN2 pinouts are as follows...

1 - GND
2 - 24vAC (direct from transformer) PSU supply to card reader/dongle
3 - 24vAC (direct from transformer) PSU supply to card reader/dongle
4 - GND
5 - VSL (28v DC unregulated) PSU supply for solenoids and motors
6 - VDD (12v DC regulated)
7 - VCC (5v DC regulated)
8 - GND

The output fuses/LEDs are as follows...

F1/LD1 - VCC (+5v) to Payout Control Board
F2/LD2 - VDD (+12v) to Payout Control Board
F3/LD3 - VSL (+28v Unregulated) to Payout Control Board
F4/LD4 - VSL (+28v Unregulated) to A/V Control Board (Via Main Control Board)
F5/LD5 - VLP (+28v Lamp Supply) to A/V Control Board (Via Main Control Board)
F6/LD6 - VDD (+12v) to A/V Control Board (Via Main Control Board)
F7/LD7 - VCC (+5v) to A/V Control Board (Via Main Control Board)
F8/LD8 - VCC (+5v) to Main Control Board
F9/LD9 - VDD (+12v) to Main Control Board
F10/LD10 - VSL (+28v Unregulated) to Main Control Board

Output fuses for the VCC (+5v) rail are T3.15A, all the rest are T5A.

[stompstu]

Thanks Daverob

[stompstu]

I found the folowing data sheets from Daverobs post.

[stompstu]

ok, got half the board back up and working.
looks as if the NJM2367 Power converter is faulty.
Just checked Maplin and Rs components and they dont have any.
Anyone know where I can source one from.

[hanabi]

I would have suggested Maplins...

I tried googling and could only find this company with the product listed on their page

DIAL: Semiconductor Stockist

It seems you need to fill in an enquiry form for a quote though, although it does state no minimum order for stocked parts

So it might be worth considering if you can't get sorted elsewhere

Or maybe someone here has a parts / donor machine that you could purchase the part from??

Good Luck

[stompstu]

Hi all
Still working on the power supply, had a break over christmas.
cant have the kitchen looking like a worksop all the time...;o)

the VRD1 component is labeled Z20474AZ (accross the 24v AC)
and the VRD3 component is labeled Z20154AR (across the 12v DC)

thanks to Daverob pointing out thy are crowbar protection components.
they are both blown and I need to replace them with an equivient component.
I would like to get ones close to the original values.

would anyone know what equivilent components can be used or
what values I should look for?
i.e should the VRD1 be 47 volts and VRD3 15 volts?

regards for all your help.
Stuart

[new in town]

Can you post a Pic of the two components in Question?

[new in town]

the VRD1 component is labeled Z20474AZ (accross the 24v AC) :

Z2047 datasheet Z2047çš„å�‚æ•° 规æ*¼ä¹¦ 技术资料 ë�°ì�´í„°ì‹œíŠ¸ データ・シート application notes

the VRD3 component is labeled Z20154AR (across the 12v DC) :

Z2015 datasheet Z2015çš„å�‚æ•° 规æ*¼ä¹¦ 技术资料 ë�°ì�´í„°ì‹œíŠ¸ データ・シート application notes


Scroll down a bit to see the Pdf. data files.

The main page for the Site. :

Electronic Component- Search, Parts Data Sheets, Cross Reference, Catalogs

[stompstu]

Thanks to Everyone,
The power supply is back up and running.
;o)