Repairing my HB-F1XD

By conceitedjerk

Supporter (9)

conceitedjerk's picture

07-12-2018, 01:17

Hi folks. My friend is repairing my Sony HB-F1XD and he asked me to find him the following information:

"Found 2 issues with your msx. Seems at least one capacitor on the HIC1 has popped and taken out a transistor marked F4. I believe it's a BJT BC857 but so far cannot verify. Any chance the forums you're in can verify the transistor type? I've checked the (Japanese) service manual myself but the diagrams aren't that clear"

My electronics knowledge is zero, can anyone here answer? I can pass along any followup questions to him if need be...

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By RetroTechie

Paragon (1461)

RetroTechie's picture

07-12-2018, 02:59

You mean the one marked Q4, type F...something, that serves to mute the output sound?

Judging from how that's used, probably any common NPN transistor like a BC546 should do. Or whatever surface mount equivalent you can find. Just make sure the correct transistor terminals (emitter, base, collector) are connected to the correct points in the circuit (read: same way original transistor was connected). So if that Q4 was a surface mount part, would be useful to find replacement with same pinout. Wink

By Meits

Scribe (5208)

Meits's picture

07-12-2018, 03:04

All smd capacitors on the hic must be replaced. If you're unlucky, the hic has to be cleaned and/or fixed as well.
Here's an old service manual.
There are some experienced "Sony hic computer fixing users" here who can help you further.

hic, notorious suicide board :(

By conceitedjerk

Supporter (9)

conceitedjerk's picture

07-12-2018, 04:19

Thank you, I'll pass this info along to my friend, may have further questions.

By PAC

Guardian (4894)

PAC's picture

07-12-2018, 12:14

More information here. And don't forget to check this great tutorial about its brother :) , I'm sure it will help.

By conceitedjerk

Supporter (9)

conceitedjerk's picture

07-12-2018, 13:31

PERFECT! I'll forward these links to him, thank you!

By conceitedjerk

Supporter (9)

conceitedjerk's picture

10-12-2018, 04:45

My friend just texted me a few minutes ago saying my MSX2 is fixed and seems to work fine. Thank you for your help, can't wait to have it back!

By Meits

Scribe (5208)

Meits's picture

10-12-2018, 11:25

That is so nice to read. Have joy with it.

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