Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
Right you are! Actually, I measured at the fan connector after the resistors and it does still read 18v going to the fan. So I decided to replace the 12v fan with a Suncom 24v ME50152V1 which draws 2.8w. The unit is much quieter and holds temperature better (less peaks and overuns in temperature listed on the lcd screen). My guess is that the loud whining 12v fan was inconsistent in voltage/amperage draw due to running above spec and was causing instability issues in temperature This is the fan I got: (sh*t...
hdtvman
Member
Last Activity: 04-26-2023, 11:45 AM
Joined: 12-24-2020
Location: Punta Gorda, FL
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
Great idea....Leave a comment:
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
Definitely, I have my suspicious eye on this one... :-)...Leave a comment:
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
I want to give a big shout out to this forum and especially to sam_sam_sam for all the great advice! I am happy to announce that the bad ZD-915 is now fixed. Wound up checking the caps - they were OK then I replaced the CQ1265RT and she came back to life! Doesn't overrun the temperature set and appears to be working well. I have it back on the bench and will give it a work out this week to see how it goes. There was no evidence of cracking or burning on the original CQ1265RT. I guess it just failed internally.Last edited by hdtvman; 01-17-2021, 09:29 PM.Leave a comment:
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
This model number a good choice ?
ME50152V1-000C-A99...Last edited by hdtvman; 01-10-2021, 11:56 AM.Leave a comment:
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
Great tips!
Still waiting for the CQ1265RTs - got about 5 of them just in case they will be needed :-)Leave a comment:
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
Fantastic Tips!
The switching ICs haven't arrived yet but I will follow your bulb procedure to prevent it from going full heat and burning out the element.
The new unit arrived yesterday and indeed it is a complete replacement unit and it does work. I have to say that the company I ordered from on Ebay (I believe was AnestyDirect) were great to deal with. I did open up first to be sure nothing was amiss and it all is good (so far...). I turned it on to the default 160C first and let it...Leave a comment:
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
update: replacement unit has not arrived yet... but the tracking indicates the same weight package as the first unit (7.5 lbs) so it appears to be a complete replacement (keeping fingers crossed).
Ordered some FSCQ1265RT just in case...Last edited by hdtvman; 01-01-2021, 10:44 PM.Leave a comment:
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
wow - that quite a collection of 'em. At least thats a great collection of spare parts. I did read somewhere that these units do not clear properly and that the buildup accumulates on the suction tube internally making the performance worse gradually.
I did hear from the vendor today - just a short message saying they are sending a package and my UPS tracking number is xxxx. (not quite sure what they are sending, maybe a new replacement unit. that would be awesome...). They did not mention RMA or sending defective...Leave a comment:
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
If I remember correctly the trigger on mine does not work until it finishes booting. The board says rev 3. maybe they broke something from the improved version 2 :-)...Leave a comment:
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
Good tip! they did come pretty crappy looking to start with (those were the top pictures) - I'll crank it up and reflow again - cant hurt... They also let a lot of flux on the board which I have now cleaned up for the most part ... unfortunately it didn't help......Last edited by hdtvman; 12-25-2020, 11:37 AM.Leave a comment:
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
Forgot to mention - the CQ1565R T1 is measuring 164v across most of the pins (not sure that is correct - the same voltage that is at the primary transformer side on the bottom of the board. There is no evidence of burning/splitting etc......Leave a comment:
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
better view of circuit board after reflowing. Power supply board is ZD-1565 (V3) but appears very similar to V2...Last edited by hdtvman; 12-25-2020, 11:03 AM.Leave a comment:
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
more pictures as requested :-)
main board has 110vac coming in and 164v dc at transformer primary and also at T1 transistor. Nothing at all coming out of the secondary. did not see an obvious F1 thermal fuse - maybe its internal to the transformer... (edit: just read above post - these don't have any - thanks!) also no voltage going out to secondary boards (LCD and controls) no 5v or 18v at the connectors. Reflowed all the dubious solder joints, no joy....Last edited by hdtvman; 12-25-2020, 11:03 AM.Leave a comment:
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
And a very Merry Christmas and Happy Holidays to all !Leave a comment:
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
I'm a newbie with electronics (I fix Commodore stuff but thats about it) but to me it sounded like a fuse almost and then I read above about these power supplies possibly having a thermal fuse... in the transformer perhaps ? so maybe......Leave a comment:
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
I got it from a vendor on Ebay from Kentucky (clearing house for China AliExpress vendor perhaps...). I dug into a little bit and took it apart yesterday evening but didn't really want to completely dig in until I heard from vendor. But I definitely will try the reflowing solder and other troubleshooting in a day or so and report back. If I have no luck I'll definitely PM :-) I'll post some pictures I took last night but it was more for determining if I could get another power supply etc... - the shots...Last edited by hdtvman; 12-24-2020, 02:29 PM.Leave a comment:
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
I have a brand new ZD-915 (got it forty days ago) and have only used 2 or 3 times for very limited time. Today went to desolder a 40 pin IC and after desoldering the last pin I heard a small pop and now it wont turn on at all. Line fuse is OK. I suspect as mentioned above internal power supply issue. Trying to work out a replacement from the vendor but I may be SOL as its past the 30 days to return and the unit came with no warranty info, so I'm not even sure where to have it serviced. A casual inspection reveals...Leave a comment:
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