Hi,
Recently, my Jamo Sub 260 died and refused to turn on. I opened and inspected the amplifier; no burn marks, no suspicious components, and the fuse was not blown. I tested all the transistors and components and all seems to be fine, even the smd ones. However when i checked the voltages, I do not seem to be getting any current into each of the transformers. So as for now, i am suspecting it may be a problem with the power supply region of the amplifier. On the underside of the pcb are 2 smd chips, controlling the driver transistors (2 irf740s) of the main transformer. However, scratch marks are present on the ic packages and I am unable to identify what model number are those. My guess is that the problem lies within these chips(marked U1 and U2 on the pcb) that caused the failure of my sub. Does anyone here have any info of this chips or any relevent info to help me fix this sub?
Thanks!
Recently, my Jamo Sub 260 died and refused to turn on. I opened and inspected the amplifier; no burn marks, no suspicious components, and the fuse was not blown. I tested all the transistors and components and all seems to be fine, even the smd ones. However when i checked the voltages, I do not seem to be getting any current into each of the transformers. So as for now, i am suspecting it may be a problem with the power supply region of the amplifier. On the underside of the pcb are 2 smd chips, controlling the driver transistors (2 irf740s) of the main transformer. However, scratch marks are present on the ic packages and I am unable to identify what model number are those. My guess is that the problem lies within these chips(marked U1 and U2 on the pcb) that caused the failure of my sub. Does anyone here have any info of this chips or any relevent info to help me fix this sub?
Thanks!
