Question about Televison & Video
First, check your power source. Unplug a light or other working electric (120v) item and plug the AG-1980 directly into that exact plug. Once your power source is confirmed (120 V AC, 50-60hz, appx 33 watts) your VCR should come on. If you know you have power and it is not working, it will need service by a professional. DO NOT ATTEMPT to open and work on the VCR yourself. The entire manual for this AG-1980 VCR can be downloaded for free at the following site....
Posted on Apr 19, 2009
Power supply problems are a good possibility in this case. 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.
If you dont have much electrical repair experience - professional help should be saught. There are potentially deadly voltages stored in capacitors that must be discharged properly to avoid injury.
If you have such experience - i will continue....
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.... however the age of the VCR makes it highly unlikely to be found.
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.
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.
I generally do not spend time locating faulty Electrolytics!! Change all Electrolytic Capacitors at one shot. It is cheap (about $4USD for all of them) and it will eliminate checking all of them, and prevent future failure.
Thanks for using FixYa!!
Posted on Apr 16, 2009
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Posted on Jan 02, 2017
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