I am trying to find two smd datasheets for an Apevia 1000w prestige power supply ATX-PR1000W the SMD's are ST9S313 which is a SMPS supervisory chip and a EST 915HP or XP48024 not sure which or both is the chp prod number and the schematic
-
This relic from a technology path that came to a dead end (but still has historical interest) was brought in with a dead SMPS, which is based around a MK1210 device. I got it going after a battle. It seems to have a strange design - if it's not getting feedback that the secondary is OK it cause the big FET to go into full conduction and overloads resulting in a blown fuse at best or something worse! I'm using a Dim Bulb Tester (70W/230V) which thankfully has saved the day a number of times whilst repairing.
Now, it loads a CD OK. The motor voltage output (which is built onto the SMPS... -
I have this Huntkey HK340-72FP PC SMPS where I am facing a strange problem where the SMPS shuts down when the load on any of its 12v output rails goes above 2 amps while the rating of each 12v rail is above 10amps capable.
I have checked the following:
1. All output caps are OK, and all output rails read correct voltages at no load
2. All output diodes are OK
3. NTC is ok
4. Hi voltage cap on input correctly reads 150uF on LCR meter per the spec, also the bridge rectifier is OK
5. No short in main switching MOSFET
6. All other components... -
Hello,
I'm troubleshooting a PA speaker Mackie Th15 (schematics attached).
It is basically a smps with amp and some dsp.
The issue is that on the secondary side I read +/- ~23V instead of the expected +/- 38V. Indeed all secondary side and feedback/aux rails are like 1/2-3/5 of the expected values.
Q2, Q3, C35, C40, C33, C36, C41 and C42 were tested out of circuit with a component tester and read fine. Most of the other components on the primary were tested in circuit and seem to be fine. +HV to -HV on primary is ~330V.
By the way, the ferrite core of L10 is broken,... -
Hi everyone,
There actually was a time when early SMPS and late bakelite housed electrolytic caps coexisted in high end industrial gear. A friend of mine just got himself a CNC milling machine form that time with its first set of now 41 year old caps still installed in the PSU... and it's malfunctioning.
Two of the caps have already leaked slightly onto the board. I have not desoldered or measured any so far but they should qualify for replacement.
Now I'm wondering what to put in there as a replacement. First idea was state of the art low-ESR Nippon KY,... -
Power supply used in an Onkyo laser disc player, circa 1995?
Came into the Repair Cafe after another tech had a go and gave up. Only evidence I could see of a repair was C22 (2200uF) cap had been changed and D25 was missing. The power plug had been left disconnected so I figured I wasn't going to apply power until I'd checked everything out. I replaced the usual suspects: the SMPS chip ML1210, all the electros except the main charge caps, the 33V zener, replaced the missing high-frequency rectifying diode. I meticulously checked over remaining components with my meter and all seem...
Comment