Panasonic FS-A1WX MSX2+ Help - Wont power on!!!!! :(

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By CU_AMiGA

Resident (63)

CU_AMiGA's picture

10-11-2009, 19:42

Hi

Recently got a Panasonic FS-A1WX MSX2+ but for some reason the system doesnt seem to power on. Is there supposed to be an LED that lights up when i switch on? If i plug the AV cable in the MSX half way i do get some sort of signal when i turn the system on (the screen becomes a little bit more misty). but no response. i am using the following transformer:

http://www.maplin.co.uk/Module.aspx?ModuleNo=19413

has anyone got any suggestions? HELP! :'(

regards

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By jltursan

Prophet (2538)

jltursan's picture

10-11-2009, 20:00

Crappy luck!. I'm sorry to hear that... Sad

- The transformer looks fine to me, 45W it's enough.
- Several leds light right after a power on. If you leave the ren-sha turbo slider (the most left bigger slider) in its right position, the adjacent led will be permanently on. The center led always is lit, and the FDD one always lights when the FDD is initially accessed, after that it's off.

So, you see some activity from the computer, ¿leds, FDD access?. If there's no activity maybe it's a internal PSU failure. If you have powered the computer for hours with the Maplin transformer the internal PSU heats and finally fails (of course if it's already weak)...

By CU_AMiGA

Resident (63)

CU_AMiGA's picture

10-11-2009, 20:55

nope. no fdd access or any LEDs on at all! just that slightly misty screen on the screen! do you think its the transformer? i hear no buzzing sound from it or any evidence that its actually on properly! lol

By jltursan

Prophet (2538)

jltursan's picture

10-11-2009, 21:38

If there're no signs of real activity, I suposse that something power-related has happened.

When you switch on the machine, what exactly happens with the TV screen?, do you initially see the common grainy screen and then it changes to something?, with misty do you mean blurry solid gray or any other pattern but the grainy screen?
If it changes, could mean that some power arrives to the video and it's enough to generate some image.

First of all if you have a multimeter you can easily measure the voltaged at the internal PSU outputs while powered. Be careful touching things!.
No idea of the voltages; but they must be the usual +5, +12 and -12 or -5. Look at Hans Otten MSX pages to find a WSX/WX service manual or schematics, I'm sure that he has something about it...

By CU_AMiGA

Resident (63)

CU_AMiGA's picture

10-11-2009, 22:14

the only evidence that the machine is on is that the screen goes to a lighter black clolour but only slightly. is it solid colour, no patterns at all.

By CU_AMiGA

Resident (63)

CU_AMiGA's picture

11-11-2009, 12:31

anybody?

By NYYRIKKI

Enlighted (5873)

NYYRIKKI's picture

11-11-2009, 12:39

Go with the jtursan suggestions...

Transformer of my A1WX has failed once as well...

By Leo

Paragon (1236)

Leo's picture

11-11-2009, 12:51

do you hear sound , like when you put a gae cartridge.

You can try put sound to max on tv , you can "hear" Z80 cpu activity .

but if the power led it self does not light on ....
what about caps key , no light on ?

you may test +5V an other voltage from cartridge slot instead of openin g th whole thing , the rear one
is quite easy to access. eware not to shunt +5v with other signal like ground !

if you have other 110v compatible device ( electric shaver ) u can test the converter ...

By Jipe

Paragon (1502)

Jipe's picture

11-11-2009, 14:43

if you have a multimeter put on resistor value , DON'T PLUG THE MSX , check your primary transformer ( a few ohms ) and you power switch ( 0 ohms if switching )

By CU_AMiGA

Resident (63)

CU_AMiGA's picture

13-11-2009, 03:34

i have no multimeter to do the test with. i ll try turning on the msx again later on and do volume/picture tests. one question. are transformers meant to make a quiet humming/buzzing sound when plugged in/on? my one is silent!

By Jipe

Paragon (1502)

Jipe's picture

13-11-2009, 11:43

take a 4.5v baterry and a bulb lamp , connect to primary trasformer , if lamp shine the primary transformer is good
check secondary with the same thing
Remind don't plug the power for this operation !!

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