ZD-915 Desoldering Station when on the blink

[sam_sam_sam]

About a week I went to turn the De-soldering Station and it did not come so I took it apart to see why
and found a 5 pin IC chip so I look it up to see what it was and here is what I found---------->

It has one of these regulator in the power supply FSCQ1565RTYDTU Power Switch ICs - Power Distribution 15A/650V QRC Power Switch

https://cdn.badcaps-static.com/pdfs/...3d31708caa.pdf

So let order two of them and see what happen

I put one in and what do you know it came back to life

So I look at old regulator with a magnifying glass and I see a crake from one side of the chip to the other side in the front of it



https://www.badcaps.net/forum/showth...sam#post335581

[sam_sam_sam]

Re: ZD-915 Desoldering Station when on the blink

I had use my old ZD-915 which the vacuum pump is failing

I still use it with a pencil soldering iron that I use the plug off of a bad De-soldering gun to make it work

I am so glad that I was able to fix the newer ZD-915 power board

It was very hard to get that 5 pin regulator IC chip off the board with a weak vacuum pump

Dose any one have a ZD-916

The problem with this one is that when you turn it on about 2 to 3 minute later the LCD display goes blank and then about a minute later the LED light for the display goes dark

If you turn it off for about 10 seconds it work again and the same thing happen again

This soldering station has never really work from day one

[stj]

Re: ZD-915 Desoldering Station when on the blink

check the state of the soldering on all those ZD units.
and maybe recap them.

[Agent24]

Re: ZD-915 Desoldering Station when on the blink

I have a Duratech (rebranded ZhongDi ZD-912) with iron and hot air (not desoldering) but it is the older version with a linear power supply

[sam_sam_sam]

Re: ZD-915 Desoldering Station when on the blink

check the state of the soldering on all those ZD units.
and maybe recap them.

I had recap the power board on the newer ZD-915 when I first bought it
https://www.badcaps.net/forum/showth...sam#post335581

The ZD-916 dose not have a switching power supply in it

If I am not mistaken it only has two cap on the power board

[stj]

Re: ZD-915 Desoldering Station when on the blink

if it's the soldering station in the foto,
i'v had one of those with a bad thermal fuse in the transformer.
put a meter on the transformer output and see if it drops when the unit dies.

[sam_sam_sam]

Re: ZD-915 Desoldering Station when on the blink

Thanks for the info

[sam_sam_sam]

Re: ZD-915 Desoldering Station when on the blink

vacuum pump

Dose any one have a ZD-916

The problem with this one is that when you turn it on about 2 to 3 minute later the LCD display goes blank and then about a minute later the LED light for the display goes dark

If you turn it off for about 10 seconds it work again and the same thing happen again

This soldering station has never really work from day one also I could not understand why the back light for the display was so much brighter than the back light on the ZD-915 ones now I know why -------->

I found what the problem is with the ZD-916 control board is that there was a really very small SMD chip that was a cap that was very discolored so I checked with my blue ESR meter and the reading 14 ohms

I did no know what the value was but it is on one of the power rails right next to a diode so I put something that I had on hand now the back light is about the same brightness as the ZD-915

I also recapped the power board and the control board

It has been on for over an hour now and has not gone off once

[sam_sam_sam]

Re: ZD-915 Desoldering Station when on the blink

Well the ZD-915 was sick again
The switcher went out again

Here is what happen I went turn it on and it came on and went right back off in about one two seconds

Can anyone shed some light to why this switcher keeps going bad
I put a new one in and it started working again

[ReeceyBurger123]

Re: ZD-915 Desoldering Station when on the blink

Ohh no I have one thats been heavily used for around 6 months, wander when it will fail :L

[stj]

Re: ZD-915 Desoldering Station when on the blink

got a foto of the psu board?
it may have a bad or under-rated snubber cap or something.

[sam_sam_sam]

Re: ZD-915 Desoldering Station when on the blink

got a foto of the psu board?
it may have a bad or under-rated snubber cap or something.

It will a few days before I can get it apart again
Snubber caps are the blue colored caps right

[sam_sam_sam]

Re: ZD-915 Desoldering Station when on the blink

Ohh no I have one thats been heavily used for around 6 months, wander when it will fail :L

I had mine for about a year before I had trouble with it but I recaped it before I started using it

[stj]

Re: ZD-915 Desoldering Station when on the blink

hey, i just saw the other thread you bumped.

18v output.
25v caps - hell no.
for smoothing 18v you want 35v caps.

old rule, a smoothing cap should be atleast 1.5x running voltage to handle the spikes.

18+9=27
that's far too close!
also, if it pulses the element with DC does it have a reverse protection diode?

[Agent24]

Re: ZD-915 Desoldering Station when on the blink

Snubber caps are the blue colored caps right

It is true that blue-coloured high voltage ceramic capacitors are often used in a circuit for that purpose, but it does not mean that every time you see a blue capacitor it is a snubber capacitor, or that if a capacitor is not blue, that it isn't a snubber capacitor.

You have to look at the schematic or trace out the diagram and figure out which capacitor is the snubber capacitor.

It is usually part of a resistor, capacitor and diode snubber network which is in parallel to the transformer winding that the MOSFET drives, in a flyback style switching supply. See picture for a typical circuit.

If the capacitor has failed, they probably didn't use one with high enough voltage rating.

[stj]

Re: ZD-915 Desoldering Station when on the blink

they can be blue or yellow or orange, colour is irelevent.
what we are talking about is resin-coated high-voltage ceramics. usually 1-3Kv rated.
you can use them for lots of stuff.
but snubber circuits see short but hgh spikes so high voltage caps are a must.

[sam_sam_sam]

Re: ZD-915 Desoldering Station when on the blink

Ohh no

18v output.
25v caps - hell no.
for smoothing 18v you want 35v caps.

old rule, a smoothing cap should be atleast 1.5x running voltage to handle the spikes.

18+9=27
that's far too close!

By the way that what the voltage value that was in there


also, if it pulses the element with DC does it have a reverse protection diode?

Do these two 2200uf caps ---------> are uf value high enough for 13 amps or do I need 2500 or higher

[stj]

Re: ZD-915 Desoldering Station when on the blink

you lost me - what 2200uf caps?
ripple current is in the datasheets btw.

[Agent24]

Re: ZD-915 Desoldering Station when on the blink

We need photos, we have no idea what your power supply looks like.

[sam_sam_sam]

Re: ZD-915 Desoldering Station when on the blink

UpDate

Here are some photos of the switching power supply for this unit