Specifications

Ver SG 9/200 35 Sharp Electronics Corporation
Procedure for repairing an open foil pattern
To protect the electronic circuits, microwave ovens are provided with a fine foil pattern
in the primary circuit that acts as a fuse. If the foil pattern is open, follow the
troubleshooting procedure as outlined below.
Problem: Power ON, Indicator does not light.
Step Occurrence Cause or Correction
1. Only pattern “a” is Insert jumper wire
broken J1 and solder.
(see page 37)
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2. Patterns “a” and “b” Insert coil
are broken RCILF2003YAZZ
between “c” and “d”.
NOTE: At the time of this repair, make a visual inspection of the varistor for burn
damage, and test the transformer with an ohmmeter for the presence of a layer short.