JRC JMA-5212-4, Service Manual

Page: 130 / 172

6-14
6.2.2. Error Messages for the Display System
Keyboard(Data) Keyboard2(Data)
Description
These messages indicate that communication with the operation unit is faulty. Keyboard(Data)
indicates the communication status of the main operation unit; Keyboard 2(Data) indicates the
communication status of the sub-operation unit.
The operation unit may be faulty, an operation unit cable may be broken, the power terminal
board circuit in the display system may be faulty, or the radar processing circuit may be faulty.
Location of cause
o
Procedure
CCK-979 (English
version) or CCK-980
(Japanese version) in
the operation unit
x
Check the insertion of J6001 on the operation circuit CCK-979/980.
x
Replace the operation circuit CCK-979/980.
x
Replace the operation unit NCE-7699A or NCE-7729A.
Power terminal board
circuit CBD-1702A in
the display system
Keyboard(Data):
x
Check the insertion of J5002 and J5003 on the power terminal
board circuit CBD-1702A.
x
Check the connection of operation unit cable J4.
x
Replace the CBD-1702A.
Keyboard2(Data):
x
Check the insertion of J5002, J5003, and J5007 on the power
terminal board circuit CBD-1702A.
x
Check the connection of operation unit cable J9(AUX).
x
Replace the CBD-1702A.
CDC-1350 in the
display system
x
Check the insertion of J4402 and J4003 on the radar processing
circuit CDC-1350.
x
Replace the CDC-1350.