Kenwood TKR-851 Service Manual page 6

TKR-851
TX-RX unit (B/2)
Control section
Component side
R653
1
PTO
14
TXO (MIC signal output)
TXI (MIC signal input)
RXO (RX audio signal output)
AC (Audio control signal output)
BC1 (Scramble code output 1)
BC2 (Scramble code output 2)
BC3 (Scramble code output 3)
BC4 (Scramble code output 4)
PTI (PTT signal input)
CLRC (Clear code for scrambler)
RXI (RX audio signal input)
PTO (PTT signal output)
6
INSTALLATION
SB
8C
SB
CN603
CN604
CN606
CN605
Fig. 1
CN601 Voice
scrambler
1
Display
unit
NC
8C
GND
14
Fig. 2
PTO
Fig. 3
3. External Speaker (KES-4 or KES-5)
The TKR-851 has a internal built-in speaker (5W/8Ω), and
the external speaker output from the TEST/SPKR connector
(15-pin) on the rear of the radio is 4W/4Ω. Use external
speaker KES-4 or KES-5.
3-1. Connection for the KES-4 or KES-5 With the TKR-851
■ When taking the AF output from the TEST/
SPKR connector (15-pin) on the rear of the radio
The following tools are required for changing the connec-
tor.
• Extracting tool
The following extracting tool is recommended :
Molex Inc. Order No. : J5800-002 (W05-0878-00)
1. Remove the connector with jumper from the external
speaker connector on the rear panel of the radio. (Fig. 4-1)
Note : Save the jumper, which is required when the radio
is used without the external speaker.
2. Remove the terminals with the jumper from the connec-
tor housing holes number 9 and 12 using the extracting
tool.
Removing the jumper lead (Fig. 4-2)
1) Insert the extracting tool (J5800-002) into the connec-
tor while pushing the jumper lead in the direction of
(a).
2) Push the extracting tool into collapse the barbs of the
crimp terminal.
3) Pull out the lead while continuing to push the extracting
tool in the direction (b).
3. Reinsert the terminal with the black and white stripe lead
into hole number 12, and the terminal with the black lead
into hole number 6. (Fig. 4-3)
4. Attach the connector to the external speaker connector on
the radio.
Display unit (A/2)
Foil side