HIC-1 board redesign and improvement

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By Wierzbowsky

Guardian (3430)

Аватар пользователя Wierzbowsky

31-10-2021, 19:18

Almost all components have arrived. I started to prepare for the new board's testing by putting the original HIC board into a "socket". But that was easier said then done. Desoldering the HIC board was pain in the @ss. It appears that the original pins were not only soldered on both sides of the motherboard, but they were also soldered to both sides of the HIC board. And the ground polygons were very big. So, I had to use the soldering iron to remove the board's ground pins. Better to cut it out and then remove the pins from the board with a soldering iron and tweezers. Here's a pic of the prepared mobo:

By Grauw

Ascended (10604)

Аватар пользователя Grauw

31-10-2021, 19:44

That’s some serious ground plane Smile.

By gdx

Enlighted (5575)

Аватар пользователя gdx

01-11-2021, 01:32

Panasonic FS-A1 motherboard is not double sides so it's not difficult to remove it. It's not necessary to cut the pins if you have a good desoldering pump.

By Wierzbowsky

Guardian (3430)

Аватар пользователя Wierzbowsky

01-11-2021, 02:54

gdx wrote:

Panasonic FS-A1 motherboard is not double sides so it's not difficult to remove it. It's not necessary to cut the pins if you have a good desoldering pump.

I have a good one: ZD-915. Trust me, it didn't do the job all the way. I had to use the soldering iron for pins connected to the ground plane.

By sdsnatcher73

Prophet (3374)

Аватар пользователя sdsnatcher73

01-11-2021, 03:47

That ground plane also seems to act like an EMC shield does it not? Will you add it to your version?

By sdsnatcher73

Prophet (3374)

Аватар пользователя sdsnatcher73

01-11-2021, 03:56

gdx wrote:

Panasonic FS-A1 motherboard is not double sides so it's not difficult to remove it. It's not necessary to cut the pins if you have a good desoldering pump.

This particular machine is an FS-A1F though (still may be single sided not my knowledge area) but the FS-A1 uses what I believe is either a predecessor to the HIC-1 or an alternative version possibly even from a different supplier (but my gut says predecessor).

By gdx

Enlighted (5575)

Аватар пользователя gdx

01-11-2021, 09:38

You are right, FS-A1 doesn't have HIC-1 board. It looks like but it's not the same.

By Wierzbowsky

Guardian (3430)

Аватар пользователя Wierzbowsky

02-11-2021, 15:22

sdsnatcher73 wrote:

That ground plane also seems to act like an EMC shield does it not? Will you add it to your version?

If I see interference while testing the prototype, then yes - I will add the ground plane. Otherwise - no. Ground planes may have positive, as well as negative effects. There's nothing near this board that could cause interference.

By sdsnatcher73

Prophet (3374)

Аватар пользователя sdsnatcher73

03-11-2021, 20:28

Two remarks:

1. The HIC-1 board is above the mainboard and tracks pass underneath it, those tracks emit the electro magnetic signals which can be picked up by tracks on the HIC-1 board.
2. The HIC-1 board is used in many different machines, so even if there is no issue in your FS-A1F it may be completely different in e.g. a Sony HB-F1, e.g if tracks are moving in different directions (up-down vs. left-right).

By Wierzbowsky

Guardian (3430)

Аватар пользователя Wierzbowsky

03-11-2021, 22:05

One millimeter of air is a good enough insulator. Besides, the replacement board will be 5mm above those tracks because of the socket. The interference may only come from neighboring tracks on the same board. But I hope I routed the board correctly.

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