Sharp MZ-80B Owner's Manual page 138

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• Power switch operation
Once the power switch is turned off, wait at least 10 seconds before turning it on again. This ensures correct opera-
tion of the microprocessor. Never insert the power plug into an AC outlet with the power switch set to ON.
• Cassette deck maintenance
Dirty cassette deck recording and reproducing heads may result in incorrect data recording the reproduction. Be
sure to clean the heads every month. Commercially available cleaning tape is convenient.
• Discoloration of CRT screen
If a certain spot of the CRT screen is lit an external period of time the spot may become discolored . (If it is neces-
sary for certain spot to be lit for an extended time, turn down the brightness control on the display control unit.)