[sebhc] H89 strange problems....

[Paul A. Pennington]

    Robin;

    Those are hum bars in your video, and your troubleshooting is in the 
right area -- the power supply.  One weak point in these units is the bridge 
rectifier.  It's the large one in a metal case with four push-on terminals. 
Replace it with one rated for higher current.

    While you're at it, replace the connectors with soldered connections to 
both ends of the wiring to the bridge.  The molex connector would frequently 
fail from overheating due to the current it carried.  Soldering the wires to 
the bridge and the circuit board will remove this as a future problem.

    After fixing many of these back in the day, I sent it in to Heath/Zenith 
and they published it as a service note.

    Paul Pennington
    Augusta, Georgia 

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