JMA-5300MkIIsm
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INDEX > 6.Troubleshooting > 6.2 Scanner Unit error messages<br />
6.2.5 TXRX (Video)<br />
[1] Content<br />
There is a problem with the radar video signal output of the Scanner Unit.<br />
If TXRX (MHV) or TXRX (Heater) appears, address the problem there first.<br />
This message can appear even when the transmitter is not operating. Therefore,<br />
first check the magnetron current in the test menu to check whether the<br />
transmission function is operating properly or not.<br />
If there is a problem with the transmission function, it is possible that there is a<br />
fault in modulation circuit, power supply circuit, or T/R Control Circuit CMC-<br />
1205R.<br />
If the transmission function is operating properly, it is possible there is a problem<br />
with the receiver.<br />
[2] Problem location<br />
[2]-1 Modulation Circuit CPA-264 in Scanner Unit (NKE-2254/1130)<br />
• Check the insertion status of J2102 and J2103 in Modulation Circuit CPA-264.<br />
• Modulation Circuit replacement (CPA-264). (NKE-1130, see section 4.2.7, page 4-11)<br />
• Modulator Circuit replacement (CPA-264). (NKE-2254, see section 4.3.5, page 4-31)<br />
6<br />
[2]-2 Power Supply Circuit CBD-1682A in Scanner Unit (NKE-2254/1130)<br />
• Check the insertion status of J1003 in Power Supply Circuit CBD-1682A.。<br />
• Power Supply Circuit replacement (CBD-1682A). (NKE-1130, see section 4.2.9,<br />
page 4-13)<br />
• Power Supply Circuit replacement (CBD-1682A). (NKE-2254, see section 4.3.7,<br />
page 4-35)<br />
[2]-3 T/R Control Circuit CMC-1205R in Scanner Unit (NKE-2254/1130)<br />
• Check the insertion status of J1111, J1103 in T/R Control Circuit CMC-1205R.<br />
• T/R Control Circuit replacement (CMC-1205R). (NKE-2254, see section 4.2.10, page<br />
4-14)<br />
• T/R Control Circuit replacement (CMC-1205R). (NKE-1130, see section 4.3.8, page<br />
4-36)<br />
[2]-4 Receiver Unit NRG-162A, NRG-229 in Scanner Unit (NKE-2254/1130)<br />
• Check the insertion status of J101 in Receiver Unit NRG-162A and NRG-229.<br />
• Check the insertion status of J1109 and J1110 in CMC-1205R.<br />
• Receiver Unit replacement (NRG-162A). (NKE-1130, see section 4.3.9, page 4-38)<br />
• Receiver Unit Replacement (NRG-229). (NKE-2254, see section 4.2.12, page 4-16)<br />
6-11
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