Service manual

TH-K4AT/K4E
42
Adjustment points
TX-RX unit (A/3)
Component side view
J2
DC IN
J3
MIC
J4
SP
VR1
VR5
VR6
LV
B
LCD
ANT
BTEMP
GND
SET
TX-RX UNIT (A/3)
Component side view
10.VOX
Operation
Check
11.DTMF
DEV
Check
12.1750Hz
Tone DEV
Check
(E type only)
13.Protection
Check
(DC IN
terminal: 13.8V)
To exit from the Adjustment
Mode, turn the transceiver
power OFF and then ON.
1)Frequency:435.000MHz
VOX Gain: 4
AG: OFF
2)AG: 1kHz/100mV
Detector: P-P/2
HPF: OFF
LPF: 15kHz
De-emphasis: OFF
TX power: Low
1)Frequency:435.000MHz
Send DTMF code “D”
Detector: P-P/2
HPF: OFF
LPF: 15kHz
De-emphasis: OFF
TX power: Low
1)Frequency:435.000MHz
Send 1750Hz Tone
TX power: High
1)Frequency: 435.000MHz
ANT: OPEN
PTT: ON
AG
Linear detector
Am meter
Check
Check
Check
Check
Does not
transmit.
Transmits.
2.0kHz - 4.2kHz
2.5kHz - 4.5kHz
2.4A or less
Item Condition
Measurement Adjustment
Specifications/
Test equipment Unit Terminal Unit Parts Method
Remarks
MIC
ANT
TX-RX
(A/3)
ADJUSTMENT
Note: For details of sending DTMF code “D”,
refer to the “Single Tone Mode” on page 27.
VR1 : TX frequency
VR5 : MAX DEV
VR6 : DCS modulation valance
LV : VCO lock voltage terminal