JRC JMR-92 Series Field Service Manual page 636

Step 2 Change the KOPU.
Float the KOPU from the mounting frame. While keeping it afloat, remove the rear cable (W64:
J642). The cable can be removed by pushing the both ends of the connector. Remove the KOPU
from the mounting frame and change it.
After replacing the KOPU, assemble to the original condition by repeating the same procedure
in the reverse order. Please make sure to tighten all the screws and connect all the cables back in
place.
①
Step 3 Check operation.
After the replacement of the KOPU is completed, turn ON the circuit breaker for the power
supply of the display unit and check the operation as follows.
(1) Check that a keyboard open error has not occurred.
(2) By referring to "7.2.3 Checking the Operation of the Operation Unit [Key Test]," check
that all the buttons and knobs of the KOPU respond normally.
(3) By referring to "7.2.5 Testing LED Brightness [Light Test]," check the brightness of the
LEDs.
This completes KOPU replacement.
①
②
W64
4-415
W64:J642
Chapter 4 Replacement procedure