Toshiba HX-10 no power

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Por BignellaMSX

Resident (42)

imagem de BignellaMSX

02-05-2021, 18:07

Por Jipe

Paragon (1502)

imagem de Jipe

02-05-2021, 18:36

i have download the manual
push the range button for diseable auto selection and retry
are you sure the contact with the probe is correct ?

Por BignellaMSX

Resident (42)

imagem de BignellaMSX

02-05-2021, 19:05

I've tried all the manual ranges and still nothing.

It looks like the probes are making good contact.
https://mega.nz/file/qREyUB7Z#YOthnu27D3SDKEHwtUDp63XggjjVEW...

And in the cart slot they definitely are... and I've got the switch held down as if a cart was in there.
I assume the cart slot would be DC though?

Por Pentarou

Champion (394)

imagem de Pentarou

02-05-2021, 19:57

Can you check with a KNOWN working AC voltage if your multimeter is working?
All good multimeters have a fuse inside, I can see "500ma Fused" in the photo you posted above.

Por Jipe

Paragon (1502)

imagem de Jipe

03-05-2021, 10:02

it is not useful to press the switch of the slot
when there is no cartridge the msx works under basic
and tensions are present on the slot
you can still check the correct work of the switch at the ohmeter

Por BignellaMSX

Resident (42)

imagem de BignellaMSX

03-05-2021, 12:29

Checked the tape player lead and get a 241 v reading so the multimeter is good.

https://mega.nz/file/nccwVR6b#K0IYnNpEWp-WxPK0GsRxd9e0_P1HtP...

So can I check, the cartridge slot should be AC or DC?

Por Jipe

Paragon (1502)

imagem de Jipe

03-05-2021, 13:34

for testing on the cartridge slot you should be on DC position

Por Wild_Penguin

Hero (641)

imagem de Wild_Penguin

03-05-2021, 15:17

I think it would be very surprising to get a reading from the slot (or any DC voltages) in case you cannot get the AC voltages from the transformer.

As you've measured the inductances from the transformer (and they are same as Jipe's HX-10) and you've measured another AC voltage (so the multimeter is working), there must be some very obvious (a "DOH!" -inducing) error somewhere you've missed in your troubleshooting. This would be so much easier if you had another person with you to troubleshoot and spot any errors! Smile

I.e. there must be a discontinuity (intermittent?) at the power cord, switch or the transformer. Another reason could be there was a short circuit, but in that case there would be a blown fuse at your apartment / house electric box.

Re-measure the voltages after the transformer. Measure the mains voltage before the transformer at the MSX. I.e. double check for discontinuities this way.

Por BignellaMSX

Resident (42)

imagem de BignellaMSX

03-05-2021, 15:53

I think the fuse was blown originally as it was tarnished looking on one side.
As the plug was very brittle and partially broken I replaced it.

I've been watching Pimp My Eight where he completely refurbed a Phillips VG8020 so I've got more of an idea what I should be looking at now. https://youtu.be/HIzgHmlkOcw

I'm assuming that as the transformer is supposed to give out 16v and 8.5v that there's further transformation and conversion to DC on the PCB itself?

If I wanted to replace the transformed with a new switching power supply I presume I would need to have the same voltages, rather than the final 12v, -12v and 5v.

Also, the part I said looked like it had bad solder I'm assuming is the voltage regulator as it has the heatsink attached?

Now I have more of an idea I will start over and re-test everything.

Por BignellaMSX

Resident (42)

imagem de BignellaMSX

03-05-2021, 16:35

I checked and the new fuse was blown, not sure if it was a dud or it blew after I put in.

So I've put a new fuse in and I'm definitely getting 240v before the transformer.
The continuity on the switch is good when in on position.

https://mega.nz/file/qMMAgJqZ#flMFZSJi15vpcOksr1gIiD8eEMmggP...

So to check the transformer output:
Common (black probe) in the blue wired terminal
Red in the others should have voltage.

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