858D hot air station hidden menu ? - Page 1
Forum section: electronics / general

author: Dannyx
author_rank: Regular Contributor
timestamp: March 01, 2022, 09:15:36 pm
content: Good day folks. Today something happened with my 858D hot air station I use on a regular basis at work. I'm sure the "brand" is irrelevant in this case, since they're all the same under the hood, hence why I can't even remember it - I think it's Yihua or something like that.What happened is I think I accidentally entered some sort of calibration mode/hidden menu/"service mode" of sorts: I turned on the power switch at the front, but because I was in a hurry and didn't feel like waiting a little for the 3 dashes to show up on the display, I immediately hit the up/down buttons to try and adjust the temperature, so instead of the temperature showing up and the fan running when I picked up the handle from the cradle, the display came up with a digit, or perhaps a letter followed by a digit - can't remember exactly what it was. Either way, it was NOT what it normally displays. What I DO remember is that the fan was not running even though I had the handle off the cradle and pressing the up/down buttons increased/decreased the values of whatever the display was showing at that time.I didn't want to mess around too much here, so all I could do was turn the power off and back on, which brought it back to its regular state, but this got me thinking if anyone else has stumbled upon this and if it's of any interest whatsoever if it gives access to any possible "goodies" one may tweak. I'm also concerned that I altered whatever that parameter was set to and by turning the power off it got "saved" like that, because I didn't take note of what it originally was to set it back when I eventually noticed I was not actually adjusting the temperate, but instead flipping through these numbers, so if cycling the power counts as "saving" the changes, then I'm afraid whatever I modified may cause issues, though I didn't notice anything so far...I couldn't find any info on this and all attempts at doing so only returned results about modding the station by changing the microcontroller with custom firmware, which is not something I'm willing to put time, effort and money into - not worth it for my purposes. I'm curious if there's any modding that can be done on the 858D as is, or at least if anyone has any idea what those values are or if they're even supposed to be there, or it was a fluke and me pressing a button so quickly after power on simply crashed the microcontroller causing it to spit out random nonsense on the LED display, fooling me into thinking it means something...I'll try replicating it and posting some pics.Thanks.

author: thm_w
author_rank: Super Contributor
timestamp: March 02, 2022, 12:21:07 am
content: If it said SE or HE, sensor error, heater error:https://usermanual.wiki/m/c17352810b7b1601fffa4fe3f67c39341b1af19426d594232a2786390eeffd78.pdfIf its a model without a calibration pot, then calibration is done with the buttons:"Calibration is done by holding both UP & DOWN button for 3 secs. "

author: Dannyx
author_rank: Regular Contributor
timestamp: March 02, 2022, 05:21:59 am
content: No, I doubt it said HE or SE because pressing the buttons changed some values. It may be the second suggestion, though I didn't hit them BOTH at the same time, so maybe there are slight variations between models in how you enter calibration mode and this one enters it when you hold one of the buttons at startup...

author: Dannyx
author_rank: Regular Contributor
timestamp: March 22, 2022, 07:45:57 am
content: Ok, I tried it again today and sure enough: holding the UP button while turning the power on displays 00 with a decimal dot moving between each digit. Pressing up/down adjusts this display in increments of 1, so -2, -1, 0, +1, +2 etc, so this is most definitely some sort of calibration. I just left it at 00 and turned the power off which hopefully saved it