I have a video Panasonic AG-1980. Defect: When I am assisting a cassette and the key this TBC in off the image is normal and the color also. I slide the control soft-sharp and the silent image according to...
these decks are notorious for bad surface mount capacitors in the video and servo circuits. there will be quite a few that will need to be replaced. if you cant do it yourself, it will probably cost too much to repair. you will need access to an esr meter (pasive capacitor checker that checks the capacitor in circuit and the part does not have to be removed), a good soldering iron with a small tip, flux, thin solder, hemostats,solderwick blue and patients. the capacitors in question are the little round silver capacitors soldered directly to the boards. test all caps and locate caps with bad readings and mark them as bad but dont cover up the value marked on the top.the voltage is listed as a letter followed by the series of cap.(eg: 16 jhb would be a 16 mfd, j voltage rating, hb series cap) you can buy these caps cheap from digikey online. you need to be very careful when replacing the caps as if you do it wrong you will pull a trace and have to do major jumper wire work to replace the broken trace. the key to removing the bad cap is to grab them with the hemostats and squeeze, once the hemostats have a good grip of the cap start spinning the cap, dont pull just spin.you are trying to break the leads. once they break take your hot iron and wipe off what is left of the cap leads, let it cool and go back and remove remaining solder with the solderwick. clean the spot on board where cap was with anhydrous alcohol to clean any fluid that leaked out of the cap and made it bad. gently grab replacement cap with hemostats so you can hold it and apply flux to bottom of leads, place cap in its place watching polarity( black line on cap is negative and lines up with solid white side of silksceen on board or opposite the little plus on the board, if there is not a line on the cap or if there is a small "n" on the board it is a non polarized cap and direction does not matter)put a small(SMALL)amount of solder on your iron and touch it to the remaining exposed lead. if you fluxed enough and you used the correct amount of solder it should jump to the lead and leave a small shiny round solder joint. practice makes perfect and this will fix your problem. you may have to replace 40 to 50 caps maybe more, depends on how many are bad. good luck with your repair, 1980's were good decks!
Aug 20, 2011 |
Panasonic AG-1980 S-VHS VCR