In a KRK ROKIT 5 powered speaker, there is a power supply board. It clearly delivers to another circuit board multiple voltages: +19V, -19V, +5V, GND. The +5V line only show 4.05V when measured, so I think a voltage regulator has failed. I am trying to find a replacement for what I believe to be an 8-pin voltage regulator IC labeled “U2” on the power supply board.
Welcome to the TechForum debrota! I’m having difficulty finding any information available on the web that helps me identify what kind of regulator it is. I’m not entirely sure it’s an LDO or linear type. Without a datasheet, I can’t really find an alternate here. I tried the CL2106 number, but no hits unfortunately.
I wasn’t sure if the number on U2 was CL2106 or CI2106 or C12106. Does DigiKey sell any 8-pin surface mount 5V voltage regulators with pinouts that would make sense to have pins 5 and 6 soldered together, and pins 7 and 8 soldered together, as in the photos?
Can you make out the second line at all? It’s possible that the first line is just date code and lot code info.
With that pin-out (joining 5-6 and 7-8) I’m wondering if it might not be a dual MOSFET or something.
Typical dual MOSFET pinout in 8-SOIC package:
I believe the markings on the 8-pin package are:
CL 2106 OH
0BFB94N or possibly 0BF894N
The overseas sources that indicate they have CL2106OH don’t want to divulge who makes this. Some of them indicate it’s some type of voltage regulator. It’s a 7 pin device, four pins on one side, 3 on the other.
Hi @debrota ,
Usually those 7-pin devices are used for improved clearance and creepage in off-line flyback applications. So the generated output voltage is not measurable at the chip, but at the another side of the fly-back transformer (see ref C16 for rough location). Warning, the circuit around the CL2106 may be connected to mains, thus there may be lethal voltages around.
Here’s one datasheet (Linkchip-tech).
Cheers, heke