Question about Panasonic AG-1980 S-VHS VCR

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No Power The display began "sputtering" out. Now there is no power whatsoever. If I unplug the unit, then plug it back in, the power indicator comes on briefly, then goes off and the unit will not power up. I took the cover off to see if there were any fuses - it appeared there were two on the power supply, but both looked good. Any ideas? Perhaps a bad power supply? Thanks in advance!

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Good suggestions by Dodgecharger. I generally do not spend time locating faulty Electrolytics!! Blindly change all Electrolytic Capacitors at one shot. In India, the cost for all the 10-12 Electrolytic Capacitors in a VCR Power supply would not go beyond Rs. 150 (Approx. US$4)and the job is over in half an hour. Works 9 times out of ten for the symptoms mentioned by GoBotDotCOM

Posted on May 22, 2007

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Power supply problems are a good possibility. If you have a DC voltmeter, you could check the outputs. In standby mode, you should see at least a +5 volt supply. This standby line is necessary to power the logic circuitry, particularly the microprocessor. In the full on mode (VCR power on), other voltages should be present in addition to the +5. You should see a +12-14 volt, (powers the capstan, video drum, & other motors if present, & possibly a supply for the LCD display of somewhere around -35 volts. A common cause for a non-working power supply in early VCRS ('80s & early '90s), such as Panasonic manufactured rigs, is defective electrolytic capacitors used to filter the above noted supplies, especially the in the +5 & +12 volt lines. Sometimes a capacitor in the primary side of the supply will go bad, causing the dead symptom. Obviously, a schematic is beneficial especially if you are a novice. If by chance bad electrolytics are the cause, and you wish to repair it, I'd suggest using capacitors designed for these switching power supplies, such as the Panasonic FC series available from Digi-Key and other suppliers. If by chance you do have one of these early rigs, these were excellent units. Most early VCRs were made like tanks, very unlike the "made to break" junkers of the last 10+ years.

Posted on May 21, 2007

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