Abell TH-308GB UHF Building instructions

TH-308GB UHF SERVICE MANUAL
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Abell Industries Co., Ltd
TH-308GB UHF SERVICE MANUAL
V1.0
Contents
GENERAL………………………………………………………………………………1
REALIGNMENT ………………………………………………………………………2
DISASSEMBLY FOR REPAIR ………………………………………………………3
CIRCUIT DESCRIPTION ……………………………………………………………4
PARTS LIST……………………………………………………………………………5
EXPLODED VIEW ……………………………………………………………………6
PACKING………………………………………………………………………………7
ADJUSTMENT…………………………………………………………………………8
PC BOARD VIEWS
TX-REX UNIT(X57-6030-XX)…………………………………………………9
SCHEMATIC DIAGRAM……………………………………………………………10
SPECIFICATIONS ………………………………………………………………… 11

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GENERAL
INTRODUCTION
SCOPE OF THIS MANUAL
This manual is intended for use by experienced technicians familiar with similar types of
commercial grade communications equipment. It contains all required service information for
the equipment and is current as of the publication data. Changes which may occur after
publication are covered by either Service Bulletins or Manual Revisions. These are issued as
required.
ORDERING REPLACEMENT PARTS
When ordering replacement parts or equipment information, the full part identification
number should be included. This applies to all parts: components, kits, or 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.
PERSONAL SAFETY
The following precautions are recommended for personal safety:
DO NOT transmit until all RF connectors are verified secure and any open connectors are
properly terminated.
SHUT OFF and DO NOT operate this equipment near electrical blasting caps or in an
explosive atmosphere.
This equipment should be serviced by a qualified technician only.
SERVICE
This radio is designed for easy servicing. Refer to the schematic diagrams, printed circuit
board views, and alignment procedures contained witin.
Destination Number of CH RF power output
DH 16 3W
DL 16 3W

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REALIGNMENT
1 Modes
MODE FUNCTION
User Mode Use this mode for normal operation
PC Mode Use this mode, to make various
settings by means of the FPU
through the RS-232C port.
Manufacture
Mode
Use this mode, to realign the various
settings through the RS-232C port
during manufacture work
2 How to enter each mode
MODE PROCEDURE
User Mode Power ON
PC Mode Connect to the IBM PC compatible
machine and controled by the FPU
3 Setting acquainted
User Mode PC Mode Manufacture Mode

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○
1PTT(Push-To-Talk)switch
Press this switch, then speak into the microphone to call a station. Release the switch to
receive.
○
2Monitor Key
Press and hold to monitor how busy the current channel is and to monitor signals being
received that don’t contain the matched QT code.
○
3Channel selector
Rotate to select channels 1-16.
○
4LED indicator
Lights red while transmitting, green while receiving a signal. Flashes red when the battery
voltage is low while transmitting.
○
5Power switch/Volume control
Turn clockwise to switch the transceiver ON. Turn counterclockwise until a click sounds, to
switch the transceiver OFF. Rotate to adjust the volume level.
PC MODE
Preface
The transceiver is programmed by using a personal computer, programming interface
(provided by ABELL) and programming software. Pic 1 shows how the devices work.
Connection procedure
1.Connect the TH-308G to the personal computer with the interface cable(CNX-02).
2.When data is transmitted from the transceiver the red LED lights.
When data is received by the transceiver the green LED lights.
Notes:
·The data stored in the personal computer must match the Model Name when it is written
into the EEPROM. Run the software and connect the transceiver with the personal computer,
and then turn ON.
·DO NOT press the [PTT] key during data transmission or reception.

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·CNX-02 description
(PC programming interface cable: Option)
The CNX-02 is required to interface the TH-308G with the computer . It has a circuit in its
D-sub connector(9-pin) case that converts the RS-232C logic level to the TTL leverl. The
CNX-02 connects the side panel jacks of the TH-308G to the computer’s RS-232C serial
port.
·Programming software description
By installing a programming software of TH-308G, users are allowed to program the
transceiver with CNX-02.
·Programming with PC
If data is transferred to the transceiver from a personal computer with software provided
by Abell, the destination data (basic radio information) for each set can be modified.
Normally, it is not necessary to modify the destination data because their values are
determined automatically when the frequency range (frequency type) is set.
The values should be modified only if necessary.
Data can be programmed into the EEPROM in RS-232C format via the SP MIC plug.
DISASSEMBLY FOR REPAIR
Seperating the case assembly from the chassis
1.Remove the two knobs①and round nut②.
2.Remove the two screws③.
3.Expand the right and left sides of the bottom of the case assembly, lift the chassis, and
remove it form the case assembly④.

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4.Taking care not to cut the speaker lead⑤, open the chassis and case assembly.
Seperating the chassis from the unit
1.Remove the eleven screws⑥.
2.Remove the solder from the antenna terminal using a soldering iron then lift the unit off⑦.
3.Remove the two screws⑧and remove the antenna connector.
Note: When fixing the unit in the chassis, be sure to solder the antenna terminal.

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CIRCUIT DESCRIPTION
1.Frequency configuration
The receiver utilizes double conversion. The first IF is 21.70MHz and the second IF is
450KHz. The first local oscillator signal is supplied from the PLL circuit.

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The PLL circuit in the transmitter generates the necessary frequencies.
2.Receiver
The receiver is double conversion superheterodyne, designed to operate in the frequency
range of 450-470MHz, 400-420MHz, 350-370MHz, 370-390MHz.
1)Front-end RF amplifier
An incoming signal from the antenna is applied to an RF amplifier (Q4) after passing
through a transmit/receive switch circuit (D19 off) and a band pass LC filter. After the signal
is amplified by RF amplifier (Q4), the signal is filtered through a band pass filter to eliminate
unwanted signals before it is passed to the first mixer.
The voltage of these diodes are controlled by to track the CPU(IC2) center frequency of the
band pass filter.
2)First Mixer
The signal from the RF amplifier is heterodyned with the first local oscillator signal
from the PLL frequency synthesizer circuit at the first mixer (Q24) to create a 21.70MHz first
intermediate frequency (1st IF) signal. The first If signal is then fed through two monolithic
crystal filters(XF1 and 2) to further remove spurious signals.
3)IF amplifier
The first IF signal is amplified by Q48, and then enters IC10 (FM prcessing IC). The signal
is heterodyned again with a second local oscillator signal witin IC200 to create a 450KHz
second IF signal. The second IF signal is then fed through a 450KHz ceramic filter (CF2) to
further eliminate unwanted signals before it is amplified and FM detected in IC200.
4)AF amplifier
The recovered AF signal obtained from IC200 is amplified by IC300C, filtered by the
high-pass filter IC300B and low-pass filter Q14. And de-emphasized by R43 and C31. The
processed AF signal passes through an AF volume control and is amplified to a sufficient
level to drive a loud speaker by an AF power amplifier(IC11).
5)Squelch
Part of the AF signal from IC17 enters IC17 again, and the noise component is amplified
and rectified by a filter and an amplifier to produce a DC voltage corresponding to the noise
level.
The DC signal from the FM IC goes to the analog port of the microprocessor(IC2). IC2
determines whether to output sounds from the speaker by checking whether the input
voltage is higher or lower than the preset value.
To output sounds from the speaker, IC2 sends a high signal to the AFCC lines and turns IC4
on through Q33, Q39, Q6 and Q5.

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6)Receive signaling
QT/DQT
300Hz and higher audio frequencies of the output signal from IF IC are cut by IC300A and
IC300D. The resulting signal enters the microprocessor (IC2). IC2 determines whether the
QT matches the preset value, and controls the AFCC and the speaker output sounds
according to the squelch results.
3.PLL frequency synthesizer
The PLL circuit generates the first local oscillator signal for reception and the RF signal for
transmission.
1)PLL
The frequency step of the PLL circuit is 5 or 6.25kHz. A 12.8mhz reference oscillator
signal is divided at IC3 by a fixed counter to produce the 5 or 6.25kHz reference frequency.
The voltage controlled oscillator (VCO) output signal is buffer amplified by Q47, then devided
in IC3 by a dual-module programmable counter. The devided signal is compared in phase
with the 5 or 6.25kHz reference signal in the phase comparator in IC3. The output signal
from the phase comparator is filtered through a low-pass filter and control the oscillator
frequency through VCO.
2)VOC
The operating frequency is generated by the oscillator with Q3. The control voltage is
applied to the varactor diodes D27 and D28 to rectify the oscillator frequency. The RX pin is
set low in transmit mode, Q30 and Q20 are turned off to adjust current frequency to transmit
frequency.
3)UNLOCKED DETECOR
If a pulse signal appears at the LD pin of IC3, an unlocked condition occurs,and the DC
voltage obtained form D7, R1 and C291 causes the voltage applied to the LOCK pin of the
microprocessor to go low. When the microprocessor detects this condition, the transmitter is
disabled and the error indicating alarm occurs, ignoring the push-to-talk switch input signal.
4.Transmitter
1)Transmit audio
The modulation signal from the microphone is amplified by IC5A, passes through a
preemphasis circuit, and amplified by the other IC5B to perform IDC operation. The signal
then passes through a low-pass filter (splatter filter)(Q13 and Q9) and cuts 3kHz and higher
frequencies. The resulting signal goes to the VCO through the VCO mudulation terminal for
direct FM modulation.
2)QT/DQT encoder

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A necessary signal for QT/DQT encoding is generated by IC2 and FM-modulated to the
PLL reference signal. Since the reference OSC does not mudulate the loop characteristic
frequency or higher, modulation is performed at the VCO side by adjusting the balance.
3)VCO and RF amplifier
The transmit signal obtained from the VCO buffer amplifier Q45, is amplified by QY1. This
amplified signal is passed to the power amplifier, QY4 and Q29, which consists of a 2 stage
FET amplifier and is capable of producing up to 3W of RF power.
4) ANT switch and LPF
The RF amplifier output signal is passed through a low-pass filter network and a
transmit/receive switching circuit before it is passed to the antenna terminal. The
transmit/receive switching circuit is comprised of D17, D19. D1 and D19 turned on
(conductive) in transmit mode and off (isolated) in receive mode.
5) Terminal protection circuit
When the thermistor(TH2) reaches about 80°C, the protection circuit turns on Q50 to
protect transmitting final amplifier (Q29) from the over heating.
5.Power supply
A 5V reference power supply [5V] for the control circuit is derived from an internal battery.
This reference is used to provide a 5V supply in transmit mode [TXC], a 5V supply in receive
mode [RXC], and a 5V supply common in both modes [PLC] based on the control signal sent
from the microprocessor.
6.Control system
The IC2 CPU operates at 7.37 MHz. This oscillator has a circuit that shifts the frequency
according to the EEPROM data.

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TH308GB(D02)
Spare parts list-Side A
Item Specification Package Description QTY Part Number
Chip resistor
1 0R 0603 ±5% 5 R3 R42 R62 R64 R110
2 10R 0603 ±5% 3 R18 R113 R281
3 270R 0402 ±5% 2 R53 R54
4 100R 0603 ±5% 2 R61 R167
5 470R 0603 ±5% 1 R268
6 680R 0603 ±5% 2 R014 R015
7 1K 0402 ±5% 1 R72
8 1K 0603 ±5% 12 R04 R15 R26 R28 R59 R69 R83 R86 R116
R117 R260 R272
9 1.5K 0603 ±5% 1 R136
10 1.8K 0603 ±5% 3 R56 R75 R254
11 2.2K 0603 ±5% 2 R03 R242
12 3K 0603 ±5% 1 R143
13 3.3K 0603 ±5% 1 R277
14 4.7K 0603 ±5% 4 R01 R12 R139 R016
15 5.6K 0402 ±5% 3 C45 C46 R73
16 5.6K 0603 ±5% 2 R24 R43
17 6.8K 0603 ±5% 1 R77
18 8.2K 0603 ±5% 1 R126
19 10K 0603 ±5% 11 R10 R19 R67 R78 R79 R118 R134 R138
R158 R165 R263
20 20K 0603 ±5% 2 R36 R87
21 22K 0603 ±5% 2 R41 R135
22 33K 0603 ±5% 2 R47 R50
23 47K 0603 ±5% 3 R63 R98 R132
23 56K 0603 ±5% 1 R22
24 68K 0603 ±5% 1 R70
25 91K 0603 ±5% 1 R27
26 100K 0603 ±5% 6 R17 R52 R68 R71 R94 R227
27 120K 0603 ±5% 2 R25 R49
28 150K 0603 ±5% 2 R74 R95
29 180K 0603 ±5% 1 R85
30 220K 0603 ±5% 1 R40
31 270K 0603 ±5% 1 R44
32 390K 0603 ±5% 1 R32

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33 470K 0603 ±5% 2 R4 R66
34 750K 0603 ±5% 1 R137
35 1M 0603 ±5% 1 R97
36 1.8M 0603 ±5% 1 R48
37 NC 0603 2 R02 R267
38 NC 0402 1 R114
Resistor
network
39 1k*4 4×0603 YC164-JR-071K 1 CP1
thermistor
40
NCP18WB473J03R
B(NEW)
NTH5G16P40B473
J07TH
0603 NTC Thermistor 1 TH2
Adjustable
Resistor
41 47K Φ2 EVM2WSX80BQ4 2 VR1 VR5
42 220K Φ2 EVM2WSX80BE5 2 VR3 VR2
Chip
capacitance
43 5PF 0402 COG,±0.1PF,16V 1 C166
44 10PF 0402 COG,±0.5PF,16V 3 C85 C317 C318
45 56PF 0402 C0G,±5%,16V 1 C59
46 100PF 0402 C0G,±5%,16V 1 C261
47 220PF 0402 X5R,±10%,16V 3 C268 C329 C331
48 470PF 0402 X5R,±10%,16V 6 C11 C32 C116 C241 C245 C337
49 680PF 0402 X5R,±10%,16V 1 C56
50 1000PF 0402 X5R,±10%,16V 5 C60 C70 C86 C008 C009
51 3300PF 0402 X5R,±10%,16V 1 C55
52 3900PF 0402 X5R,±10%,16V 5 C79 C80 C81 C82 C95
53 5600PF 0402 X5R,±10%,16V 2 C44 C47
54 0.01UF 0402 X5R,±10%,16V 5 C14 C98 C109 C250 C342
55 0.018UF 0603 X5R,±10%,16V 1 R29
56 0.022UF 0402 X5R,±10%,16V 2 C110 C113
57 0.027UF 0402 X5R,±10%,16V 4 C25 C31 C73 C74
58 0.033UF 0402 X5R,±10%,16V 2 C58 C354
59 0.047UF 0402 X5R,±10%,16V 3 C53 C54 C209
60 0.1UF 0603 X5R,±10%,16V 19
C01 C5 C12 C13 C24 C50 C51 C62 C64
C71 C72 C92 C93 C97 C101 C202 C205
C210 C211
61 1UF 0603 Y5V,+80%-
20%,25V 2 C63 C99

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62 1UF 0805 Y5V,+80%-
20%,25V 1 C270
63 NC 0402 5 R38 C17 C6 C365 R115
Tan
capacitance
64 4.7UF A Type ±20%,6.3V 1 C112
65 6.8UF A Type ±20%,10V 1 C310
66 10UF A Type ±20%,6.3V 3 C61 C75 C328
Inductance
67 BLM11A601S
BLM18AG601SN1D 0603 Bead 600R 5 L11 L12 L13 L14 L43
68 LQH32MN1R0M23 1210 Air-core Coil,
Ferrite 1 R6
Diode
69 1N4148 D0603 NC D8
70 LED-02-0603-QG
C 0603 Green LED 1 LED2
71 LED-02-0603-QR
C 0603 Red LED 1 LED1
72 ISR154-400 SOD-106 DIODE 1 D24
Triode
73 2SA1362-GR SOT-23 TRANSISTOR 1 Q39
74 2SC4617 SOT-416 TRANSISTOR 2 Q13 Q14
75 2SK1824 SOT-416 FET 2 Q15 Q002
76 DTA114YE SOT-416 TRANSISTOR 1 Q2
77 DTA114EE SOT-416 TRANSISTOR 1 Q02
78 DTC114EE SOT-416 TRANSISTOR 5 Q01 Q8 Q10 Q31 Q33
79 DTC114TE SOT-416 TRANSISTOR 1 Q50
80
FMMT717 SOT-23 TRANSISTOR 1 Q001
Fuse
81 3.0A 1206 R429003-3A-32V 1 FU2
Crystal
82 7.3728MHz 8×4.5mm NX8045GB 1 X6
IC
83 AT24C08(SI27) SOP8EEPROM 1 IC13
84 NJM2902V SSOP14 AUDIO AMP 1 IC300
85 SN8P2707AQ044 QFP44 CPU(after
writing) 1 IC2
86 TA7368F SOP10 AUDIO POWER AMP 1 IC11
87 MC4558 SOP8AUDIO AMP 1 IC5

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TH308GB(D02) Parts list-Side B
Item Specification Package Description QTY Part Number
Chip resistor
1 0R 0603 ±5% 4 R21 R37 R216 R217
2 0R 0805 ±5% 1 R60
3 10R 0402 ±5% 1 CY5
4 10R 0603 ±5% 3 R247 R248 RY4
5 47R 0603 ±5% 3 R229 RY92 R212
6 51R 0603 ±5% 1 R2
7 100R 0603 ±5% 7 R82 R89 R91 R92 R121 R124 R213
8 150R 0603 ±5% 2 R11 R253
9 220R 0603 ±5% 2 R195 RY1
10 560R 0603 ±5% 2 R194 R239
11 820R 0603 ±5% 1 R284
12 1K 0603 ±5% 7 R20 R23 R35 R46 R125 R249 R214
13 1.2K 0603 ±5% 1 R240
14 1.8K 0603 ±5% 1 R238
15 2.2K 0603 ±5% 1 R241
16 2.7K 0603 ±5% 1 R245
17 3K 0603 ±5% 1 R58
18 3.3K 0603 ±5% 7 R13 R104 R170 R172 R176 R235
R278
19 3.9K 0603 ±5% 1 R237
20 4.7K 0603 ±5% 3 R9 R230 R231
21 5.6K 0603 ±5% 1 R169
22 6.8K 0603 ±5% 1 R33
23 8.2K 0603 ±5% 3 R55 R171 RY3
24 10K 0603 ±5% 5 R8 R31 R93 R185 R266
25 12K 0603 ±5% 1 RY2
26 15K 0603 ±5% 1 R140
27 18K 0603 ±5% 1 R210
28 33K 0603 ±5% 3 R7 R105 R133
29 47K 0603 ±5% 9 R1 R16 R182 R183 R186 R180 R228
RY69* RY70
30 56K 0603 ±5% 1 R5
31 100K 0603 ±5% 5 R119 R219 R220 R221 R236
32 120K 0603 ±5% 1 R251
33 220K 0603 ±5% 1 R206
34 390K 0603 ±5% 1 R207
35 680K 0603 ±5% 1 R246

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36 1.8M 0603 ±5% 1 R103
37 NC 0603 2 R30 R34
Resistor network
38 1k*4 4×0603 YC164-JR-071K 1 CP2
Chip capacitance
39 0.5PF 0402 C0G,±0.1pF,16V 4 C23 C302 C304 C305
40 0.75PF 0603 C0G,±0.1pF,16V 2 R14 C348
41 1PF 0402 C0G,±0.1pF,16V 3 C35 C38 C307
42 1.5PF 0402 C0G,±0.1pF,16V 1 C22
43 2PF 0402 C0G,±0.1pF,16V 4 C18 C20* C21 C41
44 3PF 0402 C0G,±0.1pF,16V 4 C78 C143 C295 C306
45 3.6PF 0402 C0G,±0.1pF,16V 1 C308
46 4PF 0402 C0G,±0.1pF,16V 2 C111 C309
47 5PF 0402 C0G,±0.1pF,16V 3 C147 C164 C298
48 6PF 0402 C0G,±0.1pF,16V 1 C297
49 7PF 0402 C0G,±0.1pF,16V 1 C299
50 8PF 0402 C0G,±0.1pF,16V 3 C2 C286 C350
51 9PF 0402 C0G,±0.1pF,16V 2 C347 C296
52 10PF 0402 C0G,±0.5pF,16V 3 C7 C37 C303
53 12PF 0402 C0G,±5%,16V 2 C36 C285*
54 18PF 0402 C0G,±5%,16V 1 C69
55 20PF 0402 C0G,±5%,16V 1 C368
56 22PF 0402 C0G,±5%,16V 1 C316
57 33PF 0603 C0G,±5%,16V 1 C352*
58 33PF 0402 C0G,±5%,16V 2 C9 C29
59 30PF 0402 C0G,±5%,16V 2 C313 CY23
60 56PF 0402 C0G,±5%,16V 1 C314
61 82PF 0402 C0G,±5%,16V 1 C369
62 100PF 0402 C0G,±5%,16V 5 C287 C288 C289 C290 CY4*
63 100PF 0603 C0G,±5%,16V 1 RY93
64 220PF 0402 X5R,±10%,16V 1 C330
65 220PF 0603 X5R,±10%,16V 2 C228 C229
66 470PF 0402 X5R,±10%,16V 22
C10 C221 C222 C223 C226 C227 C230
C232 C233 C234 C242 C243 C244
C246 C247 C254 C255 C256 CY1 CY21
CY22 CY24
67 1000PF 0402 X5R,±10%,16V 11
C30 C39 C224 C231 C258 C260 C274
C315 CY2
CY3 CY19
68 3300PF 0402 X5R,±10%,16V 1 C107
69 4700PF 0402 X5R,±10%,16V 1 C52

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70 0.01UF 0402 X5R,±10%,16V 16
C16 C26 C33 C34 C87 C271 C272 C273
C275 C276 C277 C278 C279 C280
C281 C366
71 0.047UF 0402 X5R,±10%,16V 1 C108
72 0.1UF 0402 X5R,±10%,16V 1 C1
73 0.1UF 0603 X5R,±10%,16V 18
C3 C4 C27 C28 C114 C170 C184 C186
C187 C192 C193 C195 C196 C197
C198 C204 C291 C339
74 0.47UF 0402 X5R,±10%,16V 1 C15
75 1UF 0603 X5R,±10%,16V 2 C266 C267
76 NC 0402 5 C19 C42 C40 C225 C294
Adjustable
resistor
77 10PF Φ2 TZVY2Z100A001R00 3 TC2 TC3 TC4
Tan capacitance
78 0.1UF Atype ±20%,35V 1 C320
79 1UF Atype ±20%,16V 1 C269
80 2.2UF Atype ±20%,16V 3 C115 C321 C322
81 4.7UF Atype ±20%,6.3V 3 C8 C324 C325
82 10UF Atype ±20%,6.3V 4 C327 C332 C335 C359
83 100UF Ctype ±20%,6.3V 1 C334
Inductance
84 BLM11A601S
BLM18AG601SN1D 0603 Bead 600R 5 L4 L40 L41 L44 L45
85 BLM21PG300SN1D 0805 Bead 3 L35 L42 LU7
86 LQG11A2N7S
LQG18HN2N7SJ00 0603
High frequency
Multilaminated
Induction
1 LY18
87 LQG11A3N3S
LQG18HN3N3S 0603
High frequency
Multilaminated
Induction
1 RY90
88 MLK1005S18NJT00
LQG15HN18NJ02D 0402
High frequency
Multilaminated
Induction
1 L3
89 MLK1005S22NJT00
LQG15HN22NJ02D 0402
High frequency
Multilaminated
Induction
2 L52 L53
90 MLK1005S27NJT00
LQG15HN27NJ02D 0402
High frequency
Multilaminated
Induction
4 L5 L10 L58 LY1
91 MLK1005S39NJT00
LQG15HN39NJ02D 0402
High frequency
Multilaminated
Induction
1 L9

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92 LQN1A27NJ
LQW31HN27NJ03L 1206
High frequency
Multilaminated
Induction
1 L50
93 MLK1005S47NJT00
LQG15HN47NJ02D 0402
High frequency
Multilaminated
Induction
2 L51 LY2
94 MLK1005SR12JT00
LQG15HNR12J02D 0402
High frequency
Multilaminated
Induction
1 L1
95 NLV25T-1R0J-PF 2520
High frequency
Multilaminated
Induction
1 LY20
96 NLV25T-R22J-PF 2520
High frequency
Multilaminated
Induction
1 L57
97 NLV25T-2R2J-PF 2520
High frequency
Multilaminated
Induction
1 L49
98 MLF1608A3R3K 0603
Low frequency
Multilaminated
Induction
5 L2 L8 L48 L65 L66
99 MLF1608E100K 0603
Low frequency
Multilaminated
Induction
1 L15
100 0.4×φ1.6×3TR P type AIR-CORE COIL pin
"E" 7 L6 L18 L20 L33 L34 L59 L60
101 0.4×φ1.6×4TR P type AIR-CORE COIL pin
"E" 3 L7 L61 L62
102 0.4×φ1.8×4TR P type AIR-CORE COIL pin
"E" 1 L63
103 0.4×φ1.6×7TR P type AIR-CORE COIL pin
"E" 1 L56
104 NC 0402 1 LY3
Diode
105 HSC277 SOD-523 DIODE 4 D19 D20 D21 D23
106 HVU131 SOD-323-A DIODE 1 D17
107 ISS372 SOT-323 DIODE 1 D12
108 ISV270 SOD-323-A Variable Capacitance
Diode 3 D27 D28 D29
109 MA2S111 SOD-523 DIODE 3 D1 D7 D26
Triode
110 2SA1362-GR SOT-23 TRANSISTOR 2 Q38 Q41
111 2SC1623 SOT-23 TRANSISTOR 1 Q42

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112 2SC2714 SOT-23 TRANSISTOR 1 Q48
113 2SC4226 SOT-323 TRANSISTOR 4 Q45 Q46 Q47 QY1
114 2SC4617 SOT-416 TRANSISTOR 2 Q9 Q11
115 2SK3078 SOT-89-3L FET 1 QY4(Remark 1)
116 2SK508NV SOT-23 FET 1 Q3
117 BF998R SOT-143R FET 2 Q4 Q24
118 AO3400 SOT-23 FET 1 Q5
119 PD54008L FET 1 Q29(Remark 1)
120 DTA114EE SOT-416 TRANSISTOR 1 Q7
121 DTA114YE SOT-416 TRANSISTOR 1 Q40
122 DTC114EE SOT-416 TRANSISTOR 4 Q1 Q6 Q30 Q36
IC
123 XC6201P502PR SOT-89-3L IC(5V) 1 IC4
124 TA31136FN TSOP16 IF SYSTEM 1 IC17
125 GP460S1/GP214D TSOP16 PLL IC 1 IC3
Crystal
126 12.8MHz 3.2×5mm NT5032SC 1 X1
127 PCB(TH308GB) PSM5.0 0501
072101 V30 X58 1
Remark:
1 Rectification on QY4 for RD01MUS1 and Q29 for RD07MVS1, updated on 2007-1-12
Pre-rectification After-rectification
Part
Numb
er
Specification Package Description Specification Package Description
QY4 2SK3078 SOT-89-3L FET RD01MUS1 SOT-89-3L FET
Q29 PD54008L FET RD07MVS1 FET
C352 33PF 0603 COG,±5%,16V 30PF 0603 COG,± 5%,16V
C285 12PF 0402
COG,±5%,16V 10PF 0402
COG,± 5%,16V
RY69 47K 0603 ±5% 10K 0603 ±5%
CY4 100PF 0402
COG,±5%,16V 8PF 0402
COG,±0.1PF,16V
C20 2PF 0402
COG,±0.1PF,16V 1PF 0402
COG,±0.1PF,16V

TH-308GB UHF SERVICE MANUAL
- 18 -
TH308GB(D57) Part List Side A
Item Specification Package Description QTY Part Number
Chip resistor
1 0R 0603 ±5% 6 R3 R36 R42 R62 R64 R110
2 10R 0603 ±5% 2 R18 R281
3 270R 0402 ±5% 2 R53 R54
4 100R 0603 ±5% 2 R61 R167
5 470R 0603 ±5% 1 R268
6 560R 0603 ±5% 1 R260
7 680R 0603 ±5% 2 R014 R015
8 1K0402 ±5% 1 R72
9 1K 0603 ±5% 11 R04 R15 R26 R28 R59 R69 R83 R86
R116 R117 R272
10 1.5K 0603 ±5% 1 R136
11 1.8K 0603 ±5% 3 R56 R75 R254
12 2.2K 0603 ±5% 2 R03 R242
13 3K 0603 ±5% 1 R143
14 3.3K 0603 ±5% 1 R277
15 4.7K 0603 ±5% 4 R01 R12 R139 R016
16 5.6K 0402 ±5% 2 C45 C46
17 5.6K 0603 ±5% 2 R24 R43
18 6.8K 0603 ±5% 1 R77
19 8.2K 0603 ±5% 1 R126
20 10K 0603 ±5% 11 R10 R19 R67 R78 R79 R118 R134
R138 R158 R165 R263
21 18K 0402 ±5% 1 R73
22 20K 0603 ±5% 1 R87
23 22K 0603 ±5% 2 R41 R135
24 33K 0603 ±5% 2 R47 R50
25 47K 0603 ±5% 3 R63 R98 R132
26 68K 0603 ±5% 1 R70
27 91K 0603 ±5% 1 R27
28 100K 0603 ±5% 6 R17 R52 R68 R71 R94 R227
29 120K 0603 ±5% 2 R25 R49
30 150K 0603 ±5% 2 R74 R95
31 180K 0603 ±5% 1 R85
32 220K 0603 ±5% 1 R40
33 270K 0603 ±5% 1 R44
34 390K 0603 ±5% 1 R32
35 470K 0603 ±5% 2 R4 R66

TH-308GB UHF SERVICE MANUAL
- 19 -
36 750K 0603 ±5% 1 R137
37 1M 0603 ±5% 1 R97
38 1.8M 0603 ±5% 1 R48
39 NC 0402 2 R114 R115
40 NC 0603 3 R02 R113 R267
Resistor
Network
41 1k*4 4×0603 YC164-JR-071K 1 CP1
Adjustable
resistor
42 47K Φ2 EVM2WSX80BQ4 2 VR1 VR5
43 220K Φ2 EVM2WSX80BE5 2 VR3 VR2
Thermistor
44
NCP18WB473J03RB
(New type)
NTH5G16P40B473J
07TH
0603 NTC Thermistor 1 TH2
Chip
Capacitance
45 5PF 0402 COG,±0.1PF,16V 1 C166
46 10PF 0402 COG,±0.5PF,16V 3 C85 C317 C318
47 56PF 0402 C0G,±5%,16V 1 C59
48 100PF 0402 C0G,±5%,16V 1 C261
49 220PF 0402 X5R,±10%,16V 2 C268 C329
50 470PF 0402 X5R,±10%,16V 6 C11 C32 C116 C241 C245 C337
51 680PF 0402 X5R,±10%,16V 1 C56
52 1000PF 0402 X5R,±10%,16V 5 C60 C70 C86 C008 C009
53 3300PF 0402 X5R,±10%,16V 1 C55
54 3900PF 0402 X5R,±10%,16V 5 C79 C80 C81 C82 C95
55 5600PF 0402 X5R,±10%,16V 2 C44 C47
56 0.01UF 0402 X5R,±10%,16V 5 C14 C98 C109 C250 C342
57 0.018UF 0603 X5R,±10%,16V 1 R29
58 0.022UF 0402 X5R,±10%,16V 2 C110 C113
59 0.027UF 0402 X5R,±10%,16V 4 C25 C31 C73 C74
60 0.033UF 0402 X5R,±10%,16V 2 C58 C354
61 0.047UF 0402 X5R,±10%,16V 2 C53 C54
62 0.1UF 0402 X5R,±10%,16V 1 C6
63 0.1UF 0603 X5R,±10%,16V 19
C01 C5 C12 C13 C24 C50 C51 C62 C64
C71 C72 C92 C93 C97 C101 C202 C205
C210 C211
64 1UF 0603 Y5V,+80%-
20%,25V 2 C63 C99
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