PC BOARD
TX-RXUNIT (X57-674X-XX)(A/3)
TX-RXUNIT (X57-674X-XX)(B/3),(C/3)
PB-43N (Ni-MHBATTERY PACK)
PG-4Y(PROGRAMMING INTERFACE CABLE)
■Numeric key PC board (TX-RXunit B/3)
■ PTT PC board (TX-RXunit C/3)
■TX-RXPC board (TX-RXunit A/3)
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1. Gluing to the key top (MIC element section)
Fig
2.Bending the LCD hardware fixture (J21-8456-03)tabs
3. PTT PCB (TX-RXunit C/3) installation procedure
4.Packing (G53-1572-02)TX/BUSY lamp installation procedure
6.Cautions for installing the chassis on the case assembly
5.Packing (G53-1572-02)bottom installation procedure
7.Cautions for installing the key top on the case assembly
Table 1 Basic configuration
■Front End
■First Mixer
Table 2 MCF (L71-0619-05)characteristics (TX-RXunit XF1)
Fig. 2 Receiver section configuration
■IF Circuit
■Squelch and Mute Circuit
■S Meter Circuit
Fig. 3 IF, Squelch, Mute and S meter circuit
■AF Amplifier
■Microphone Amplifier Circuit
Fig. 5 Microphone amplifier circuit
■Modulation Circuit
■Drive and Final Circuit
■Transmission/Reception Switching Circuit
■Temperature Protection Circuit
■PLL Circuit
■VCO Circuit
Fig. 8 PLL and VCO circuit
■Unlock Detection Circuit
■Charging Circuit
■Power Supply Switching Circuit
■Battery Type Recognition Circuit
Fig. 10 Charging and Power supply switching circuit
■Reset and Backup Circuit
■Voltage Detection Circuit
■Battery Save Circuit
■LED Drive Circuit
Fig. 13 LED drive circuit
Fig. 12 Battery save circuit
■Key and Encoder Input Circuit
16 key (K, K2, M, M2 and E3 types)
4 key (E type)
Fig. 14 Key and Encoder input circuit
■CTCSS/DCS
■DTMF
■VOX
■ Weather Alert (K and K2 types only)
Fig. 15 CTCSS/DCS, DTMF, VOX, Weather alert
■Pin function
TX-RXUNIT (X57-674X-XX)
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TH-K2AT/K2E/K2ET (Y50-580X-XX)
TX-RXUNIT (X57-674X-XX)
TH-K2AT/K2E/K2ET
TX-RXUNIT (X54-674X-XX)
0-11 :K, K2 0-21 :M, M2 2-71 :E
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Operation
B. Battery terminal reference voltage (7.5 V [Battery terminal])
D. S-meter(Two segments in S-meterlight, all segments in S-meterlight)
E.RX BPF (Lower limit frequency, center frequency, upper limit frequency)
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L. DCS modulation balance
O. VOX sensitivity (Level 1, level 9)
Item
Condition
Adjustment
Unit
Terminal
Note: If the
Note: In the
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Note: Do not
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Terminal Unit
Adjustment points
TX-RXunit (A/3)
Component side view
TH-K2AT/K2E/K2ET PC BOARD
TH-K2AT/K2E/K2ET
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PC BOARD TH-K2AT/K2E/K2ET
1 TH-K2AT/K2E/K2ET PC BOARD
TH
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PC BOARD TH-K2AT/K2E/K2ET
TH-K2AT/K2E/K2ET SCHEMATIC DIAGRAM
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TH-K2AT/K2E/K2ET SCHEMATIC DIAGRAM
Transmitter Section
Section
Receiver
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Photo is K type
