Kenwood TK-863G Service Manual page 16

TK-863G
TX-RX unit B/2
Foil side
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.
16
INSTALLATION
R705
F.RESET
TX-RX unit A/2
Foil side
R142
Fig. 10
TX-RX UNIT (X57-6490-10) (B/2)
Foil side
C629
R570
Q502
Audio Mute signal from
the external device
Fig. 11
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
Audio Mute signal
from the external device
IC508
C551
+
R576
C550 C556
IC509
1 14
I/O1 VDD
R580
2 13
O/I1 C1
3 12
O/I2 C4
4 11
I/O2 I/O4