Hot Air Station - Air Pump Failing

[stj]

Re: Hot Air Station - Air Pump Failing

maybe there is a blockage - like where the wire joins the air and leaves the unit - that area used to kink a lot on mine.

[caphair]

Re: Hot Air Station - Air Pump Failing

You could measure rms ACV at the air pump and see if it's going up to full mains voltage or not. Or use the 40W light bulb.

The trimpot only sets the lowest pump speed, it would not affect full speed.

If the pot goes to near zero ohms, and the triac is still not full on, I would change the cap from 0.1uF to 0.047uF (47nF) for 120VAC operation.
The air pump speed control design is el-cheapo and missing a RC snubber, so I'm not sure how much voltage stress the triac sees, or how much current the main potentiometer sees.

I drew this schematic of the YH 852D+ V2 pump controller, based on your pictures but I cannot see all the parts. It's a typical light dimmer circuit. Part values are all over the place depending on make (Kada, Yihua, Saike etc).

Seems to smoothly change voltage from 45vac (lowest air) up to 118vac highest setting. I tweaked the trim pot to get lowest air speed to 50vac as it seemed a little too non-existent at that setting.

I thought maybe this hose was to blame so I squeezed it open but there was no change over all. Maybe it's the pump not putting out same air as when it was new?

[redwire]

Re: Hot Air Station - Air Pump Failing

You could measure rms ACV at the air pump and see if it's going up to full mains voltage or not. Or use the 40W light bulb.

The trimpot only sets the lowest pump speed, it would not affect full speed.

If the pot goes to near zero ohms, and the triac is still not full on, I would change the cap from 0.1uF to 0.047uF (47nF) for 120VAC operation.
The air pump speed control design is el-cheapo and missing a RC snubber, so I'm not sure how much voltage stress the triac sees, or how much current the main potentiometer sees.

I drew this schematic of the YH 852D+ V2 pump controller, based on your pictures but I cannot see all the parts. It's a typical light dimmer circuit. Part values are all over the place depending on make (Kada, Yihua, Saike etc).

[caphair]

Re: Hot Air Station - Air Pump Failing

check it with a meter

Check the potentiometer? It has a smooth range.

Could I adjust the trim pot to increase air?

[stj]

Re: Hot Air Station - Air Pump Failing

check it with a meter

[caphair]

Re: Hot Air Station - Air Pump Failing

Oddly the air control seems weaker. I have full range again but just seems weaker than before even at max air. Is it possible for a new pot to cause this or?

[stj]

Re: Hot Air Station - Air Pump Failing

the cloud look is caused by the flux boiling off when it was soldered, look below it - some pins have hairline rings

on the bright side, lead-free solder is much stronger so cracked joints are less common.

[caphair]

Re: Hot Air Station - Air Pump Failing

Well new pot is in. Had to solder the ends of the old leads onto the new one so they’d reach the PCB.

Oddly the air control seems weaker. I have full range again but just seems weaker than before. Is it possible for a new pot to cause this or?

[sam_sam_sam]

Re: Hot Air Station - Air Pump Failing

Yes and even the ones that are not shine

It probably would not hurt reheat all the other solder joints as well

[caphair]

Re: Hot Air Station - Air Pump Failing

you may want to resolder the connector pins - some have ghost-rings in your picture.

Are ghost rings the greyish cloud looking things in solder joints? I see that a lot in various pcbs. What caused them? I always thought they were normal from lead-free solder

[stj]

Re: Hot Air Station - Air Pump Failing

the 3.96mm molex connectors

[caphair]

Re: Hot Air Station - Air Pump Failing

you may want to resolder the connector pins - some have ghost-rings in your picture.

Which pins?

[stj]

Re: Hot Air Station - Air Pump Failing

you may want to resolder the connector pins - some have ghost-rings in your picture.

[caphair]

Re: Hot Air Station - Air Pump Failing

It's for audio and guitar use, but not necessarily audio taper. Note the vendor sells A250k, A500k as well.

BUT the threaded shaft looks too long (it's for guitar use through thick wood).
Short shaft is 15mm, long shaft 18mm. I think yours is the short one.

Little longer shaft shouldn't be an issue. I ended up buying them just because I'm a prime member and get free two day shipping. Need this station up and running ASAP

[redwire]

Re: Hot Air Station - Air Pump Failing

It's for audio and guitar use, but not necessarily audio taper. Note the vendor sells A250k, A500k as well.

BUT the threaded shaft looks too long (it's for guitar use through thick wood).
Short shaft is 15mm, long shaft 18mm. I think yours is the short one.

[caphair]

Re: Hot Air Station - Air Pump Failing

OK the pots are Alpha so a "B500k"
"A" is audio (logarithmic) taper.
"B" is linear taper.
"C" is reverse audio (antilog) taper.

It's been many years since I listened to audio gear with a decent log pot lol

So these would work fine even though the description says it's for audio yet they're labeled B500k? Confusing

5 B500k Guitar OHM Potentiometer Split Taper Audio POTS Gold 18mm Shaft Base Dia 16.5mm https://www.amazon.com/dp/B0191AGY68..._0uvMCb92QMEZ1

[redwire]

Re: Hot Air Station - Air Pump Failing

OK the pots are Alpha so a "B500k"
"A" is audio (logarithmic) taper.
"B" is linear taper.
"C" is reverse audio (antilog) taper.

It's been many years since I listened to audio gear with a decent log pot lol

[stj]

Re: Hot Air Station - Air Pump Failing

no idea,
but audio is supposed to be log, every other use should be linear.
i doubt audio makers care anymore though.
they probably dont even understand the difference.

[caphair]

Re: Hot Air Station - Air Pump Failing

50c pots for 5$ with some gold vapor deposition?
actually they may not work.
audio pots are supposed to be logarithmic, and you need a linear track.

Doesn't the B in B500k indicate it's a linear pot? Every 500K I found says it's for guitar use but labeled B500k?

[stj]

Re: Hot Air Station - Air Pump Failing

50c pots for 5$ with some gold vapor deposition?
actually they may not work.
audio pots are supposed to be logarithmic, and you need a linear track.