Refuses to recognise CDs and told by repairer that the main chip is faulty. Replacement could be expensive because apparently there are a number of versions of this chip. My contact 'Snakehead' suggested 'shocking' this chip. Is this something i could do for myself?
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Dust can get inside the unit and land on the lens making certain the disc can't be read. Also a small rubber belt opens the door. That can break and fall off. Both are easily corrected by cleaning the lens, but you will have to go inside first find the belt that opens the draw and replace it. Or you can take it to the nearest repair shop. Belt replacement is not expensive nor is cleaning.
In most cases when the CD does not play it is possible that the optical head is a suspect. Sometimes it might pick up ordinary audio CD but will not play other formats. This indicates that the optical head is weak and so there is no detection or scanning of the CD . If the optical is working the tracks will be read immediately but with no scanning the laser head can be defective.
The main motor will not work in some cases as unless the tracks are read the drive motor will not work with signal from the processor. Also in some cases the central motor base can shift and so the distance to the disc can be more resulting in low detection. You can pull up the spindle to come closer. Sometimes certain cleaner disks will not be tracked to run for cleaning as it will not be read and so will reject. Hence it is ideal to manually clean the laser head eye using a cleaning swap /cotton bud with gentle pressure on the lens eye. If there is no result then watch if the CD spins or tries to spin. If so the board seems to work unless a test is taken on the main board but the possibility of a defective optical head can be the suspected fault. If any of the above seems otherwise we must recheck with possibilities of a malfunction of the main processor board
it must be due to a bad connection if the cables are fine it may be the connectors or where they solder on to the amp or radio board if the amp with out the radio cables attached still will only select tuner its the amp fault, even worse i could be a faulty integrated circuit eg faulty micro chip good luck with finding a replacement
Hi, F61 is an error code that shows amplifier output chip is defective and need to be replaced in Panasonic SC-AK640 unit. Amplifier output chip replacement requires soldering work and local repair shop will do this job as it is not user level repair. Hope these info will help you. Let me know if you have additional question. Thanks.
Do you have a Home Theater Surge connected to it? If so, Turn the Surge unit off then back on, and your equipment should power back up. The surge will regain Main power but not enough to reset 110v just enough to keep your presets and settings. Hope that's the problem. If you don't have a surge, look on the front of the receiver for a secondary power switch that would be labeled "Main" etc. usually located below the standby or normal power switch. If it's not that, when you press the power button, does the unit "click" once, then two or three seconds later "click" again? That would be a chip, transformer, or IC chip and need to be serviced. If not that, post a reply with the model number and I can dig up some more info for you. Hope this helps
Hi R428 is on the under side of the main pcb near the control jack sockets. It is a small chip resistor but this can be replaced with a 1/4 watt or smaller resistor.If you send me your e mail address I will send you a copy of the pcb layout, the file is to large to attach to this reply Dave
I UNDER STAN YOUR PROBLEAM VERY WELL,
PL CHECK FOLLOWING POINT'S
CHECK MUTE SIGNAL PATH WITH YOUR MAIN AMPLIFIER
CHECK MAIN AMPLIFIER STK BY REPLACING IT
CHECK MAIN SPEAKER'S.
CHECK BIASING CIRCUIT WITH STK INPUT
CHECK HEAD PHONE CONNECTOR BECAUSE IT GIVES OUT PUT TO MAIN AMP.