
16
TK-863G
F.RESET
R705
TX-RX unit B/2
Foil side
R142
TX-RX unit A/2
Foil side
Fig. 10
INSTALLATION
6. Audio Mute
When the transceiver is connected to external devices,
you can control the receiving audio signal using the Audio
mute signal of the external device. If you mute the receiving
audio signal using this modification, the transceiver does not
mute the “Audible User Feedback Tones”.
6-1. Transceiver Modification Procedure
Solder the lead of a silicon diode to the base of Q502 on
the TX-RX unit (B/2). If you connect this line to the Audio
Mute signal of the external device using this diode, the au-
dio signal of the receiver can be controlled.
7. Fitting the Control Panel Upside Down
The TK-863G control panel can be fitted upside down, so
the transceiver can be mounted with its internal speaker (in
the upper half of the case) facing down in your car.
1. Remove the control panel and the TX-RX unit (B/2) con-
trol section. (Fig. 12)
Fig. 12
Fig. 11
TX-RX UNIT (X57-6490-10) (B/2)
Foil side
Audio Mute signal
from the external device
C557
C558
C555
C554
C544
C545
C548
C549
C546
C553
R577
R571
R574
R578
R573
11
10
9
8
7
6
5
4
3
2
RXFO
RXGS
RXIN
MSKGS
MSKIN
TXOUT
IDCGS
IDCIN
TXFO
AGND
CST
1
+
C551
C550
C556
C629
R576
R580
R570
1
14
13
12
11
2
3
4
I/O1
I/O4
I/O2
C1
C4
O/I1
O/I2
VDD
IC509
Q502
Audio Mute signal from
the external device
IC508
Содержание TK-863G
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