Electronics > Repair
Yihua 948 suction upgrade
<< < (3/3)
Poroit:
G'day All,

All the replies to the OP's post relate to the electronics.

Have you taken into account O-Rings, Seals etc in the Gun and Pump that can degrade over time?

jpanhalt:
You are correct, these comments have focused on initial performance and quality.  That was their purpose, just as it seems to be for most product reviews.

As the initial product includes several spare parts, I suspect they are wear items.  Amazon currently lists many of them individually.  The gun is about $30.  Who knows what availability will be in a few years?  I wouldn't count on much.  It was a bit of a surprise even to see replacement parts available today.
Poroit:
G'day All,

Attached is what I would like to see a teardown of.

There should be a diaphragm and valves inside that will affect the suction as parts degrade.

Is there a brand or model on the top of the pump?

Are there any internal filters in the Suction Hose?
jpanhalt:
So far as I can tell, everything having to do with gas flow control and filtering is in the gun.  The instruction sheet shows what's user serviceable.  The main unit has an air pump that is clearly visible in the pictures posted before my original post (light blue cylindrical thing with inlet and outlet).  There's a large transformer and wires from the 12-V winding go to the main board.  That voltage is rectified and switched to control the pump.  Apparently, there is some voltage control that the 8-bit MCU may have a part in.  That last assumption is based on my measure of the OCV on two different units.  Yihua has mentioned "improved" units, a part of which may just be upgrades of the firmware as virtually every review of the earlier units mentions poor suction.

I considered reversing the hose connections to the pump and making it a pressure rather than suction gun.  Generally speaking when cleaning, I use vacuum.  However, pressure works at a greater distance and is more effective at removing dust and drying stuff. 
Navigation
Message Index
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod