JRC JMR-92 Series Field Service Manual page 618

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Step 5 Check operation.
After the replacement of the TOPU is completed, turn ON the circuit breaker for the power
supply of the display unit and check the operation as follows.
(1) By referring to "7.2.3 Checking the Operation of the Operation Unit [Key Test]," check
that all the buttons and knobs of the TOPU respond normally.
(2) By referring to "7.2.4 Checking Alert Sound [Sound Test]," check the alert sound volume.
(3) By referring to "7.2.5 Testing LED Brightness [Light Test]," check the brightness of the
LEDs.
(4) By referring to "7.2.6 Testing the Motor [Motor Test]," check the operation of the motor.
This completes the replacement of the TOPU.
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Chapter 4 Replacement procedure