Page 1
2
TKR-850
GENERAL / SYSTEM SET-UP
INTRODUCTION
SCOPE OF THIS MANUAL
This manual is intended for use by experienced techni-
cians familiar with similar types of commercial grade com-
munications equipment. It contains all required service in-
formation for the equipment and is current as of this publica-
tion date. Changes which may occur after publication are
covered by either Service Bulletins or Manual Revisions,
which are issued as required.
ORDERING REPLACEMENT PARTS
When ordering replacement parts or equipment informa-
tion, the full part identification number should be included.
This applies to all parts : components, kits, and chassis. If
the part number is not known, include the chassis or kit
number of which it is a part and a sufficient description of
the required component, for proper identification.
PERSONNEL SAFETY
The following precautions are recommended for person-
nel safety :
- DO NOT transmit until all RF connectors are secure and
any open connectors are properly terminated.
- SHUT OFF this equipment when near electrical blasting
caps or while in an explosive atmosphere.
- This equipment should be serviced by only qualified tech-
nicians.
SERVICE
This radio is designed for easy servicing. Refer to the
schematic diagrams, printed circuit board views, and align-
ment procedures contained in this manual.
Merchandise
received
Choose the type
of transceiver
Installation in the
optional space
Frequency range (MHz)
TX/RX 450~480
TX/RX 480~512
TX/RX 400~430
TX/RX 440~470RF power
40W
40W
40W
40WType
K
K2
K3
E
See page 11.
A personal computer (IBM PC or compatible), programming interface (KPG-46),
and programming software (KPG-66D) are required for programming.
YES
NO DC power
supply or
duplexer?
KES-4 installation YES
NO External speaker?
Repeater
programming & setup
Delivery
SYSTEM SET-UP
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TKR-850
5-6. DSP
The DSP circuit filters transmit/receive audio signal and
encode/decodes signaling (QT, DQT). This circuit consists
of IC618, IC612, IC613, IC614, IC603, IC606, IC608, IC610,
IC616, and IC619.
The receive signal DET is converted from analog to digital
by IC614 with a sampling frequency of 16.128kHz. The digi-
tized audio signal is sent to DSP IC618 to process the signal-
ing signal and audio signal. The processed digital audio sig-
nal is fed to CODEC IC613, converted from digital to analog,
and the analog signal is output from pin 16 (AOUTR). Then,
the audio signal is amplified by IC619 (B/2), passes through
the IC619 (A/2) low-pass filter, and goes to an electronic vol-
ume IC615.
The transmit audio signal coming from IC605 is amplified
by IC610, fed to pin 3 (AINL) of CODEC IC614, and con-
verted from analog to digital at a sampling frequency of
16.128kHz. The digitized transmit audio signal is AGC-pro-
cessed, pre-emphasized and filtered at 300Hz to 3kHz by
DSP IC618, and the resulting signal is fed back to CODEC
IC614, and converted from digital to analog, and the analog
signal is output from pin 15 (AOUTL). The transmit signal
from AOUTL is amplified by IC616 (B/2), passes through the
IC616 (A/2) low-pass filter, and goes to the IC611 (A/2) sum-
ming amplifier.
IC613 is a counter IC and the clock required for the
CODEC and DSP is generated by dividing the 16.515MHz
clock signal produced by DSP IC618.
IC603 and IC606 are interface IC between the CPU oper-
ated at 5.0V and the DSP operated at 3.3V.
5-7. Base-Band Circuit
The base-band circuit switches between the modulation
signal to the transmitter circuit, and remote audio and ad-
justs their levels. This circuit consists of IC605, IC607,
IC611, IC615, and IC617.
Modulation inputs include local microphone input, low-
speed data (LSD), high-speed data (HSD), external audio in-
put (TA), and external data input (TD), and demodulation out-
puts include receive audio output (RA), and receive data out-
put (RD).
The multiplexer (IC605) changes signals, the electronic
volume (IC615) adjusts the level, and the operational ampli-
fier (IC607, IC611, IC617) amplifiers and sums signals.
5-8. RS-232C Circuit
The RS-232C circuit connects the RS-232C serial port of a
personal computer directly to this model to perform FPU
operation. The FPU operation can also be performed by con-
necting a programming cable (KPG-46) to the local micro-
phone on the front panel. But, if the D-sub connector on the
rear panel is used, the programming cable is not required.
The 232C driver IC (IC620) changes the TTL-232C level. The
firmware can only be rewritten with the local microphone on
the front panel.
5-9. Power Supply Circuit
The power supply circuit generates power to operate the
CPU, DSP, flash ROM, bi-directional buffer, and base-band
circuit. This circuit consists of IC624, IC625, IC626, IC627,
IC628, and IC630.
6. DC Power Supply Circuit
6-1. DC Source Switching Relay Circuit
1. The final unit contains a relay (K1) for switching between
the Main DC and Backup Battery.
If an external power source is connected to the Main DC
terminal, the Backup terminal is isolated by the relay. If
the Main DC turns OFF due to power failure, it is
switched to the Backup terminal by the relay.
The CPU monitors which is used, Main DC or Backup
Battery.
2. Trickle charge circuit
If both Main DC and Backup Battery are connected,
trickle charging of 0.5 A max. can be performed from the
Main DC power supply to the Battery.
(The default is OFF. See the Modification section for in-
formation on the modification method.)
The battery is charged from the Main DC with D8, D9 and
R61. If it exceeds 0.5 A, the charging circuit is turned
OFF by D9.
6-2. SB Switching Relay Circuit
1. SB (Switched +B) is supplied through the relay (K1) in the
TX-RX unit A/2.
When S507 (DC source switch) in the display unit is
turned ON, the relay (K1) is turned ON to output SB.
2. If +B exceeds 18V, the relay is forcibly turned OFF by
D12 and Q25 to interrupt the power and protect the main
unit.
D8
D9
R61
Land
Main
DC
Backup
battery
120mA+B K1
(Relay)
Final unit (A/2)
TX-RX unit (A/2)
TX-RX unit (B/2)R54
IC604
CPUBUP16
Q601
+B
R165 R166
D12
K1
Q24 Q25
SB
Land
(PSW)
Display unit
(Front panel) S507
Fig. 9 DC source switching relay circuit
Fig. 10 SB switching relay circuit
CIRCUIT DESCRIPTION
Page 35
TKR-850
PARTS LIST
36
Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description New Desti- parts nation New Desti- parts nation
R788 RK73GB1J473J CHIP R 47K J 1/16W
R789 RK73GB1J102J CHIP R 1.0K J 1/16W
R790 RK73GB1J473J CHIP R 47K J 1/16W
R791 RK73GB1J102J CHIP R 1.0K J 1/16W
R792 RK73GB1J473J CHIP R 47K J 1/16W
R793 RK73GB1J102J CHIP R 1.0K J 1/16W
R794 RK73GB1J473J CHIP R 47K J 1/16W
R795 RK73GB1J102J CHIP R 1.0K J 1/16W
R796 RK73GB1J473J CHIP R 47K J 1/16W
R797 RK73GB1J102J CHIP R 1.0K J 1/16W
R798 RK73GB1J473J CHIP R 47K J 1/16W
R799 RK73GB1J102J CHIP R 1.0K J 1/16W
R800 RK73GB1J473J CHIP R 47K J 1/16W
R801 RK73GB1J102J CHIP R 1.0K J 1/16W
R802 RK73FB2A2R2J CHIP R 2.2 J 1/10W
R803 RK73GB1J473J CHIP R 47K J 1/16W
R804 RK73GB1J102J CHIP R 1.0K J 1/16W
R805 RK73GB1J473J CHIP R 47K J 1/16W
R806 RK73GB1J102J CHIP R 1.0K J 1/16W
R807 RK73GB1J473J CHIP R 47K J 1/16W
R808 RK73GB1J102J CHIP R 1.0K J 1/16W
R809 RK73GB1J473J CHIP R 47K J 1/16W
R810 RK73GB1J102J CHIP R 1.0K J 1/16W
R811 RK73GB1J473J CHIP R 47K J 1/16W
R812 RK73GB1J223J CHIP R 22K J 1/16W
R813,814 RK73GB1J473J CHIP R 47K J 1/16W
R815 RK73GB1J104J CHIP R 100K J 1/16W
K1 S76-0401-05 RELAY
D1-4 DAN235K DIODE
D5 MA742 DIODE
D7 1SS355 DIODE
D8 DAN235K DIODE
D9 HSM88AS DIODE
D11 02DZ5.1(Y) ZENER DIODE
D12 02DZ18(X,Y) ZENER DIODE
D13 MA742 DIODE K3
D600 DA204U DIODE
D601 MA2S111 DIODE
D606-625 DA204U DIODE
D626 MINISMDE190 VARISTOR
D627,628 1SS355 DIODE
D629 DA204U DIODE
IC1,2 NJM4558E MOS IC
IC3 NJM78L05UA BI-POLAR IC
IC4 NJM7808FA BI-POLAR IC
IC5 AN8009M MOS IC
IC6 M62354GP MOS IC
IC7 BU4094BCF MOS IC
IC9-œ½TK14489V BI-POLAR IC
IC10 TA7808F ANALOG IC
IC11 NJM78L05UA BI-POLAR IC
IC600 AT2408N10SI2.5 ROM IC
IC601 RH5VL42C MOS IC
IC602 BU4094BCFV MOS IC
IC603 TC74LVX4245FS MOS IC
IC604-œ½30622M4-113GP MPU
IC605 BU4053BCF MOS IC
IC606 TC74LVX4245FS MOS ICIC607 NJM4558E MOS IC
IC608 TA75S01F MOS IC
IC609 AT29C020-90TI ROM IC
IC610 TA75S01F MOS IC
IC611 NJM4558E MOS IC
IC612 TC7S04FU MOS IC
IC613 TC74VHC4040FT MOS IC
IC614 AK4550VT MOS IC
IC615 M62364FP MOS IC
IC616,617 NJM4558E MOS IC
IC618 320VC5402PGE MPU
IC619 TC75W51FU MOS IC
IC620-œ½ADM202EARN MOS IC
IC621 TC7S00FU MOS IC
IC622 TC7S66FU MOS IC
IC623 BU4094BCFV MOS IC
IC624 XC62FP1802P MOS IC
IC625,626 XC62FP3302P MOS IC
IC627,628 TA78L05F MOS IC
IC629 3B LA4422 BI-POLAR IC
IC630 TA78L05F MOS IC
Q1,2 2SC3357 TRANSISTOR
Q3 2SC3356(R24) TRANSISTOR
Q4 DTC144EUA DIGITAL TRANSISTOR
Q5 DTA144EUA DIGITAL TRANSISTOR
Q6 DTC144EUA DIGITAL TRANSISTOR
Q7 2SC4617(S) TRANSISTOR
Q8,9 2SC3356 TRANSISTOR
Q10 2SC3357 TRANSISTOR
Q11 2SC3356(R24) TRANSISTOR
Q12-15 2SC4116(GR) TRANSISTOR
Q16 2SB1132(Q,R) TRANSISTOR
Q17 DTC114EUA DIGITAL TRANSISTOR
Q18 2SB1386(R) TRANSISTOR
Q19,20 DTC114EUA DIGITAL TRANSISTOR
Q23 DTC114EUA DIGITAL TRANSISTOR
Q24 DTD114EK DIGITAL TRANSISTOR
Q25 DTC114EUA DIGITAL TRANSISTOR K,K2,E
Q25,26 DTC114EUA DIGITAL TRANSISTOR K3
Q600 2SK1824 FET
Q601 DTC114EUA DIGITAL TRANSISTOR
Q602 2SK1824 FET
Q603 DTC114EUA DIGITAL TRANSISTOR
Q604 2SK1824 FET
Q605 DTC114EUA DIGITAL TRANSISTOR
Q606 DTC363EK DIGITAL TRANSISTOR
Q609 DTC114EUA DIGITAL TRANSISTOR
Q610 2SJ506(S) FET
Q611 DTC114EUA DIGITAL TRANSISTOR
TH1 157-503-53006 THERMISTOR
A1 W02-1939-05 DBM
C304,305 CK73GB1H102K CHIP C 1000PF K
C306 CK73GB1H103K CHIP C 0.010UF K
C307 CK73GB1H471K CHIP C 470PF K
C308-310 CK73FB1E104K CHIP C 0.10UF K
C311 C92-0001-05 CHIP C 0.1UF 35WV
RX PLL/VCO (X58-4800-XX) -10 : K,E -11 : K2 -12 : K3
TX-RX UNIT (X57-6270-XX)
RX PLL/VCO (X58-4800-XX)