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6.2.2.4 KEYBOARD UNIT (MODEL DF8203921 )
(1) Removal
(a) Check that AC input power is not supplied [the
SOURCE indication lamp (green ) of the power unit
is off], then pull out the cable connected to CNA of
model JANCD-FC905.
(b)
Pull out the CNB cable connected to model JANCD-
(c) Loosen the mounting screws and remove the
keyboard from the control panel.
(2) Installation
Check the model and REV number of the replacement
(a)
module for consistency.
(b) Install the keyboard on the control panel.
(c) Insert all the cables into the original positions.
(3)
Checking Functions After Replacement
(a) Check that +5V, +12V, and +24V outputs are not
shorted due to overloading.
(b) Apply the first power and second power again and
check that no alarm occurs.
(c) Check that keys on the control panel can be
operated and the buzzer sounds.
(d)
Check that CRT OFF indication lamp is turned on
and off by operating the CRT OFF key.
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Troubleshooting
