JRC JSS-296 -, Service Manual

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NAH check 2:
NAH check 2 is the check of the PA. In this check, RF output is connected to the dummy load into the
NFC. In the above-mentioned state, 1.6MHz RF signal is inputted into NAH Power Amplifier and check
the RF input/output level, and the VSWR of the NAH.
Judgment conditions:
OK : SWR <3.0 and RF input level >= 0.1W and RF output level >=20W.
NG : SWR >=3.0 or RF input level <0.1 or RF output level < 20W.
DUMMY
AMP
JSB-196GM
Matching
circuit
NAH-692/695/698 NFC-296/896
Check the RF input level
Check the SWR
Check RF output level
NFC check 1:
NFC check 1 is the check of the NFC matching circuit. In this check, RF output is connected to the
dummy load and the check the matching on 6 frequencies.
Judgment conditions:
OK : The frequency of SWR<3 is 5 or more.
NG : The frequency of SWR>=3 is 2 or more.
DUMMY
AMP
JSB-196GM
Matching
circuit
NAH-692/695/698 NFC-296/896
Check the Matching SWR
NFC check 2:
NFC check 2 is the check of the NFC short circuit. In this check, RF output is connected to the antenna
dummy load. In the above-mentioned state, 1.6MHz RF signal is inputted into the antenna tuner and
check the VSWR of NFC sensor circuit and antenna dummy.
Judgment conditions:
OK : SWR <=2.0 and RF level >= 5W.
NG : SWR >2.0 or RF level <5W.
DUMMY
AMP
JSB-196GM
Matching
circuit
NAH-692/695/698 NFC-296/896
Check the SWR & RF input level
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