Capacitor values in Sony HIC-1 daughterboard

Por inv

Supporter (4)

imagem de inv

29-08-2019, 18:06

I looked at the schematics of HIC-1 available from

http://www.msxarchive.nl/pub/msx/mirrors/hanso/service_manua... (page 11)

but I am unable to see the values of most capacitors --- numbers are clear, but the units (uF and pF) are indistinguishable. The lowercase p and greek mu look too similar, because the scanning resolution is not high enough.

In particular, the values of C1(=C2=C3), C9, C15-17, C18(=C19=C20=C21), C23, C24.
Any help please?

(C1 looks like 180pF in the schematics, but when I detached it from an HIC-1, the value was around 500nF --- so I wonder whether it may be why this HIC-1 is not working well... both rgb and composite video outputs are not clean)

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Por Meits

Scribe (5754)

imagem de Meits

29-08-2019, 21:15

If it's the same one as in the XDJ, check the pics here.
If they're the same as in the XV, I could open up mine as the seller recapped it and used through hole caps for that.

On the XDJ hic (and probably on any hic) the following quote goes:

Omega wrote:

The caps on the HIC board were only serving the rgb to composite circuit, normal rgb was unaffected since it passes through the module, far away from the leaking caps.

Por inv

Supporter (4)

imagem de inv

29-08-2019, 21:49

Yes, pictures show the values of the **electrolytic** caps, which are C10, C14 and C22 in the schematics. It's right that when leakage is the issue, these are concerned.

But I wanted to know the values of the smd ceramic caps, whose values are not shown in the actual parts (the small brown boxes on the pcb in the pictures). So, I still need further help ...

Meits, I really appreciate that you could open yours to figure out the values! But to do that, one has to desolder the smd ceramic caps from the pcb first, and then measure the cap with a good multimeter. So perhaps this is too much to do ...

I think that that caps are only relevant to rgb->composite applies to electrolytic caps only. There are some ceramic caps in the rgb->rgb circuit on HIC.

Por Meits

Scribe (5754)

imagem de Meits

29-08-2019, 22:07

The guy who did that XDJ for me still has it in his possession. I'll ask him to take a look.
For me there is no way I can measure SMD caps.

Por Omega

Master (214)

imagem de Omega

29-08-2019, 22:15

Unfortunately it's not possible to measure the value of the ceramic capacitors without desoldering all of them. I don't want to do that to Meits' XDJ I'm afraid Sad

Por inv

Supporter (4)

imagem de inv

30-08-2019, 06:50

Yes, it would be too painful to check the values by measuring...

Because the numbers are given but only the units (pF, nF, uF) are unclear, I guess it can be figured out without too much difficulty if one understands the HIC-1 circuit... I wish I could do... So, any help would be greatly appreciated!