6. Maintenance & Check 55
(1) Replacing Main Power Supply Fuse F1
One reason for this fuse blowing is a faulty cable attached to the power supply. Check the cables
before replacing the fuse, then turn the power on. If the fuse blows again, the Power Supply
(CBD-1813) may be faulty. Contact JRC or its agent.
(2) Replacing 24VDC Input Power Fail Alarm Fuse F2
One reason for this fuse blowing is the input of an abnormal voltage. Check the input voltage at J11
pins (3) and (4) of the Interface Block. Check that the voltage is as rated (24VDC) (operating voltage:
21.5 to 31.5VDC) before replacing the fuse. If the fuse blows again, the Interface Block (CGD-2082),
the Power Supply (CBD-1813), the Cables (CFQ-9132, CFQ-9131, CFQ-9130, CFQ-9125), the
Display/the Power Supply (CBD-1810), or the Control Block (CCK-962) may be faulty. Contact JRC
or its agent. (See the list of offices at the end of this manual.)
(3) Replacing Output Printer Fuse F3
One reason for this fuse blowing is an over current in an external device connected to J13 pins (1) and
(2) of the interface block. Temporarily remove the cable to the external device. If the fuse blows
again, the Interface Block (CQD-2082) may be faulty. Contact JRC or its agent. (See the list of
offices at the end of this manual.)
(4) Replacing Display Power Supply Fuse F4
One reason for this fuse blowing is the Cable (CFQ-9130) connected between the Interface and the
Display, the Display (NJA-98), or the Interface block (CQD-2082) may be faulty. Contact JRC or its
agent. (See the list of offices at the end of this manual.)
6.7 Repair Parts
Parts name Type Remarks
Main Unit CDJ-2338-1A
TX/RX Unit
CMN-720B25 200kHz/50kHz-A as standard
CMN-720-25 200kHz/50kHz (Discontinued)
CMN-720-22 200kHz/200kHz as option
CMN-720B55 50kHz-A/50kHz-A as option
CMN-720-55 50kHz/50kHz as option(discontinued)
Power Supply Unit CBD-1810 for NJA-98
Operation Unit CCK-962 for NJA-98
Power Supply Unit CBD-1813 for NQD-2120
I/F Unit CQD-2082 for NQD-2120
LCD Panel ASSY CCN-416
TX/RX cable CFQ-9129
Power cable CFQ-9129
Communication cable CFQ-9133
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