This device came to my shop with no power, no stand by power, and nothing comes on the screen of this CD player. It was completely dead. When I examined the CD player from the outside, I found a 110/220 switch and the switch was pushed to the 110 side and in our country, the voltage is 220. So what happened was, they have plugged 110 volts CD player into a 220 Volts power line. And the result was a dead CD player.
First thing I did was to push the 110/220 volts switch back to 220 to make sure that the same mistake would not happen again. And the examining of the CD player began.
Upon opening the cover of this CD player, I scanned the component with the naked eye and found that the main fuse was not blown but the fuse near 110/220 switch was blown. I took that blown fuse out and replaced it with a 100 watt light bulb and when I plugged the CD player to the electricity outlet, the light bulb came on very bright which is an indication that there was a nasty short in the machine.
First thing to do was to make sure the power transformer was working. Checked it and fortunately, the transformer was working fine. I traced the main power output to the bridge rectifier and there was no voltage there (I was still using the light bulb). There was something drawing a lot of current and causing the machine not to work. I took the bridge rectifier off board and checked it out and it checked fine. So, there were no volts it means no volts out of the bridge rectifier. I unhooked the cable going to the bridge rectifier and checked the voltage on that cable. There was power reaching the end of the cable but the moment I hooked the cable back in the socket, all the voltages disappear. There were two small tiny disk capacitors which acted like protectors 104Z located in PC5 and PC6, and one of them was blown. This blown capacitor shorted out the main ac power lines. The moment I took that blown capacitor off board, and replaced it with the same specification capacitor, the light bulb went dim and that was great to see. The short was gone and I could see the stand by light and the screen came on.
I replace the light bulb with a 1 amp fuse and turned the machine on and it worked amazingly. I was really happy to see that.