Sharp R-8320E Service Manual page 95

Convection microwave oven
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BUZZER DOES
6.
NOT SOUND
Is normal
waveform (2.5KHz)
applied across pin No. 1 and 5
of relay unit connector
No
Is normal
waveform (2.5KHzI
applied across pin No. 42 (D, 1 of
LSI (l-2) and "GND"?
Yes
Defective 050
l
R51, R52 & R53
Poor soldering
l
Yes
Replace
Buzzer (St'1 1

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