JMA-5300MkIIsm

INDEX > 4.Replacement Procedure > 4.3 Scanner Unit NKE-2254 (JMA-5322-7/9/6HS)
3) Remove the cables connected to the
modulator circuit board, then remove the
screws (five M4 screws) holding the
modulator circuit board in place and the
spacer (one 7 mm (nominal) spacer), and
replace the modulator circuit board.
Remove the
spacer.
Remove the
five screws.
4) After replacing the Modulator circuit
board, assemble the unit in the reverse
order of the disassembly procedure.
Do not forget to tighten the bolts and screws,
and do not forget to reconnect the cables.
Remove the
five cables.
[Check points]
1) Turn on the radar power supply. After the countdown is completed, start emission and
check that the radar image appears without error.
Transmit radar signals on a long range (48NM) and with the test menu open, also make sure
the magnetron current is shown between the 6th and 9th calibration markings (see Section
6.1.1, page 6-1).
4.3.6 Modulator Unit replacement (NMA-550-1)
[Required tools]
• A Phillips screwdriver for 4 mm screws
• A Phillips screwdriver for 5 mm screws
• Single-ended wrench (width across flats 7 mm for
M4 bolts)
• Tools for removing the cover from the scanner unit
(see Section 4.3.1, page 4-24)
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