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Test points
Names
TP1
GND
TP2
ESIG
TP3
SIG (AC)
TP4
GND
TP5
VG
TP6
TSMT
TP7
CARRIER
Adjusters
Names
R17
GAIN
R35
MAX-G
R38
STC
Jumpers
Remarks
JP1
Selects either signals 1.2 MHz or 1.4 MHz; 1.2 MHz for 75 kHz and 1.4 MHz for 175 kHz
1.2 MHz: Connects "CC" to "CA"
1.4 MHz: Connects "CC" to "CB"
JP2
Selects outputs of divider in accordance with transmission frequency
JP3
75 kHz
JP4
175 kHz
JP5
Selects carrier signals in accordance with transmission frequency
75 kHz: put resister R44 between "AA" and "AA"
175 kHz: put resister R44 between "BB" and "BB"
TRS B (01P5743)
Remarks
Echo signal (DC) inputted to A/D converter
Echo signal (AC)
TVG voltage
Transmission trigger pulse
Carrier signal for mixer circuit; 530 kHz for 75 kHz, 630 kHz for 175 kHz
Remarks
Adjusts gain of IF amplifier
Adjusts maximum gain
Adjust gain at short distance; 0 to 2 m
JP2
JP3
DA - DB
EA - EB
EA - DB
FA - EB
Fig.5.11 TRS.B board; 01P5743
JP4
FA - FB
GA - FB
5-9
K1
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