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PDF TK-7102H Data sheet ( Hoja de datos )

Número de pieza TK-7102H
Descripción VHF FM TRANSCEIVER SERVICE MANUAL
Fabricantes Kenwood 
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VHF FM TRANSCEIVER
TK-7102H
SERVICE MANUAL
© 2001-11 PRINTED IN JAPAN
B51-8610-00 (N) 1051
Chassis
(A10-4048-11)
Cabinet
(A01-2181-01)
Front glass
(B10-2668-03)
Panel assy
(A62-0942-03)
Modular jack
(E08-0877-05)
Key top
(K29-9065-01)
CONTENTS
GENERAL .................................................. 2
OPERATING FEATURES .......................... 3
REALIGNMENT ......................................... 7
DISASSEMBLY FOR REPAIR ................... 9
CIRCUIT DESCRIPTION .......................... 10
SEMICONDUCTOR DATA ...................... 15
DESCRIPTION OF COMPONENTS ........ 17
PARTS LIST ............................................. 19
EXPLODED VIEW .................................... 25
PACKING ................................................. 26
ADJUSTMENT ........................................ 27
TERMINAL FUNCTION ........................... 32
PC BOARD VIEWS
DISPLAY UNIT (X54-3340-20) ............ 33
TX-RX UNIT (X57-6380-20) ................ 35
SCHEMATIC DIAGRAM .......................... 41
BLOCK DIAGRAM ................................... 45
LEVEL DIAGRAM .................................... 47
SPECIFICATIONS .................................... 49

1 page




TK-7102H pdf
OPERATING FEATURES
TK-7102H
Key lock
Pressing this key causes the transceiver to accept entry
of only the [Vol Up/Down]*, [Key lock], Microphone [PTT],
[Monitor], [Emergency], and [Power] keys.
* Programmable
Monitor
Used to release signalling (press once) or squelch (press
and hold for approximately two seconds) when operating as
a conventional. It is also used to reset option signalling.
Scan ON/OFF
Press this key starts scanning. Pressing this key stops
scanning.
Talk around
Press this key, the transceiver uses the receive fre-
quency and the tone for transmission.
The operator can call the other party directly (without re-
peater). Press this key again, the talk around function goes
off.
Temporary delete
The “Add” channel contained in the scan sequence, and
“Delete” channel is not contained. In the scan mode, this
key switches the channel delete temporarily (Press and hold
for approximately one second).
When the transceiver is turned off, the transceiver exits
the scan or switches the scan function off.
None
Sounds error operation beep, and no action will occur.
Use this function when the transceiver is required to be
more simple operated.
4. Scan Operating
s SCAN start condition
Two or more channels must be added to all channels that
can be scanned. The transceiver must be in normal receive
mode (PTT off).
When you activate the key programmed to the scan ON/
OFF function, the scan starts. The indicator next to the pro-
grammed key LED blinks.
s Scan stop condition
The scan stops temporarily if the following conditions are
satisfied.
1) A carrier is detected, then QT/DQT matches on channels
for which receive the QT/DQT is set by the programming
software.
2) A carrier is detected on the channels for which receiving
QT/DQT is not set by the programming software or when
the monitor (signalling cancel) function is activated.
s Revert channel
The revert channel is used to transmit during scanning
and set by the programming software (KPG-70D).
1) Selected channel
The transceiver reverts to the channel before scanning or
the channel that you changed during scan.
2) Selected with talkback
The transceiver reverts to the selected channel prior to
scan initiation.
However, if a call is received on a channel other then the
selected channel and PTT is pressed before scanning re-
sume, the transceiver “talks back” on the current receive
channel.
s Scan end
When you press the key programmed to the scan func-
tion during scan mode, the scan ends.
The indicator next to the programmed key LED turns off.
s Temporary delete
It is possible to delete channel temporary during scan.
When scan stops on unnecessary channel for example by
interference of the other party, activate the delete function
(for example press and hold the key for approximately one
second), then that channel is deleted temporarily and scan
re-start immediately.
The temporary deleted channels return to pre-set delete/
add channels, when the transceiver is turned off or the scan
function is switched off.
5. Details of Features
s Time-out timer
The time-out timer can be programmed in 30 seconds
increments from 30 seconds to five minutes and off. If the
transmitter is transmitted continuously for longer than the
programmed time, the transmitter is disabled and a warning
tone sounds while the PTT button is held down. The warn-
ing tone stops when the PTT button is released.
s PTT ID
PTT ID provides a DTMF ANI to be sent with every time
PTT (beginning of transmission, end of transmission, or
both).
You can program PTT ID “on” or “off” for each channel.
The contents of ID are programmed each Radio.
The timing that the transceiver sends ID is program-
mable.
BOT : DTMF ID (Beginning of TX) is sent on beginning of
transmission.
EOT : DTMF ID (End of TX) is sent on end of transmis-
sion.
Both : DTMF ID (Beginning of TX) is sent on beginning of
transmission and DTMF ID (End of TX) is sent on end of
transmission.
5

5 Page





TK-7102H arduino
CIRCUIT DESCRIPTION
TK-7102H
CF1 (Wide)
ANT
D801
D804
ANT
SW
L36,38
D25,26
BPF
TV
IC3
D/A
CPU
L30,32
Q26 D21,22 Q21
RF AMP BPF MIX
XF1 Q19
MCF IF AMP
IC23
1/2 divider
1st local
OSC (VCO/PLL)
X1
TCXO
CF2 (Narrow)
IC5
IF system
Q6
X3 multiply
IC3
D/A CONVERTER
DEO
Fig. 2 Receiver system
s Wide/Narrow Changeover Circuit
The Wide port (pin 92) and Narrow port (pin 91) of the
CPU is used to switch between ceramic filters. When the
Wide port is high, the ceramic filter SW diodes (D13, D15)
cause CF1 to turn on to receive a Wide signal.
When the Narrow port is high, the ceramic filter SW diodes
(D13, D15) cause CF2 to turn on to receive a Narrow signal.
IF_IN
CF1
(Wide)
MIX_O
IC5
IF System
R73
Wide
IC6 92pin
R77
CF2
D13 (Narrow) D15
Narrow
IC6 91pin
Fig. 3 Wide/Narrow changeover circuit
s AF Signal System
The detection signal from IF IC (IC5) goes to D/A con-
verter (IC3) to adjust the gain and is output to AF filter (IC10)
for characterizing the signal. The AF signal output from IC10
and the DTMF signal, BEEP signal are summed and the re-
sulting signal goes to the D/A converter (IC3). The AFO out-
put level is adjusted by the D/A converter. The signal output
from the D/A converter is input to the audio power amplifier
(IC101). The AF signal from IC101 switches between the
internal speaker and speaker jack (J1) output.
IC5
IF IC
IC3 IC10
D/A DEO AF
CONV.
Filter
IC3
D/A
CONV.
IC101
AF PA
SP
Fig. 4 AF signal system
s Squelch Circuit
The detection output from the FM IF IC (IC5) passes
through a noise amplifier (Q18) to detect noise. A voltage is
applied to the CPU (IC6). The CPU controls squelch accord-
ing to the voltage (SQIN) level. The signal from the RSSI pin
of IC5 is monitored. The electric field strength of the re-
ceive signal can be known before the SQIN voltage is input
to the CPU, and the scan stop speed is improved.
IC5
AF
IF
SYSTEM RSSI
Q18
NOISE AMP D18
DET
IC6
SQIN
CPU
RSSI
Fig. 5 Squelch circuit
11

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