TC-268/368 Service Manual
7
6. Manual
Adjusting
Mode:
Press PTT and MONI simultaneously to turn on the radio
,
enter manual Adjusting mode 3
seconds later. Choose the settings by turning the channel selector knob CH1-12, use PTT
(upward) or MONI (downward) to adjust (Notice: MIC jack shouldn’t be connected with external
cable while adjusting), CH 1~12 are defined as follows:
(1) Frequency stability
(2) RF power
(3) Low battery alert
(4) Receiver sensitivity (adjust at medium frequency)
(5) Receiver sensitivity (adjust at low frequency)
(6) Receiver sensitivity (adjust at high frequency)
(7) Squelch (level 9)
(8) Squelch (level 3)
(9) CTCSS deviation (Wide)
(10) CTCSS deviation (Narrow)
(11) CDCSS deviation (Wide)
(12) CDCSS deviation (Narrow)
CH 13~16 are for adjusting transmitter and receiver. Press PTT to transmit; Press MONI
to choose Wide/Narrow, one Beep sound is Narrow, two Beep sound is Wide. CH 13~16
are defined as follows:
(13) Medium frequency (discrepancy between transmission and receive frequency is
0.1MHz).
(14) Lowest frequency (discrepancy between transmission and receive frequency is 0.1MHz).
(15) Highest frequency discrepancy between transmission and receive frequency is
-0.075MHz).
(16) Medium frequency: transmit with 250.3Hz CTCSS signals (discrepancy between
transmission and receive frequency is 0.1MHz).
Note :
To enable or disable manual adjusting mode: Short circuit the two SELF points, turn on the radio,
to enter the Mode Setting mode, and the manual adjusting function is enabled; press [PTT],
manual adjusting function is disabled. Once the manual adjusting function is disabled, the
manual adjusting mode can’t be accessed. This manual adjusting mode is suggested to be
disabled when adjustment finished.
III. CPU:
CPU control M38034M4
Pin No.
Port
name
I/O Function
1 TI I
CTCSS/CDCSS
Input
2
BUSY
I
Input busy signal
3
BATT
I
Detect battery voltage
4 NC I
NC
5 TO
O
CTCSS/CDCSS
Output
6 BEEP
O
Beep
output
7 2TNI I
2-Tone
input
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