Catwalker

So I joined the frey at the EEVBLOG and bought a hot air rework station, of which members have been buying a couple of different models:

Yuoyue 858D
Atten 858D
Yihua 858D
WEP 858D

I have the WEP unit, all of them have subtle differences, but one of the biggest things they have in common is the mis-wiring of the AC power plug, almost always the Hot and the Neutral are swapped, with the neutral being fused and switched instead of the hot lead, a small and easy fix. The bigger issues include temperature overshoot and fan control. If you check out this thread: Reverse engineering and New Firmware at the EEVBlog, you will see some of the work which has gone on. My unit, like the others, is different so here are the schematics I have come up with, in  case anyone else needs them.

Hopefully; someone will find this useful. This is for the Rev 8 board, which doesn't look much different from the Rev 6 board I have seen photos of.

The micro substitution board will not work exactly as produced, as there are differences in the orientation between the Zilog processor used in this unit and ATmel and Motorola processors in other units, though I suspect with a bit of reworking; it could be made to work. The firmware would probably also require tweaking.

 

If you check out the schematics here: Youyue 858D - you will see that my WEP unit has no negative rail, it also has an LM358 op-amp instead of an OP07, as the LM358 does not require a negative supply.

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