Icom Ic-F3gt/gs Vhf Fm Transceiver Service Manual

4 - 4
4-5 PORT ALLOCATIONS
4-5-1 CPU (IC8)
Pin
number
1
9
11
12
15
16
17
18
19
21
36–38
44–47
49
50
51
52
53
54
55
56
57
58
59Port
name
VIN
RESET
CSIFT
SCK
DAST
CLIN
CLOUT
PLST
NOIS
BUSY
OPV3–
OPV1
KR3–
KR0
RMUT
MMUT
DUSE
S5C
R5C
T5C
TXC
AFON
LIGT
ESCK
ESDADescription
Input port for battely voltage detection.
Input port for RESET signal.
Outputs reference oscillator for the
CPU control signal.
Outputs clock signal to the PLL IC
(IC1), EEPROM (IC7), etc.
• Outputs strobe signals to the
expander IC (IC10,...

5-1 PREPARATION
When you adjust the contents on page 5-5 or 5-6, SOFTWARE ADJUSTMENT, the optional CS-F3G ADJ ADJUSTMENT SOFTWARE
(Rev. 1.0 or later), OPC-478 CLONING CABLE and a JIG CABLE (see illustration at page 5-2) are required.
nREQUIRED TEST EQUIPMENT
5 - 1
SECTION 5 ADJUSTMENT PROCEDURES
EQUIPMENT
DC power supply
RF power meter
(terminated type)
Frequency counter
FM deviation meter
Digital multimeterGRADE AND RANGE
Output voltage : 7.2 V DC
Current capacity : 5 A or more
Measuring range : 1–10 W...

5 - 2
• JIG CABLE
+
(      CLONE)–
(      GND)+
(      SP)
–
(      SPE)
3-conductor 3.5(d) mm plug
OPC-478JIG cable to IC-F3GT/GS [SP] jack
CS-F3G ADJ Rev.1.0
File
COM 1: OPENOption
Connect
Reload (F5) Disp  para TCXO
[A / D]
VIN : : : 189 BDh 7 . 41V
TEMPS : : : 186 BAh 30 . 35C
LVIN : : :   98 62h 1 . 92V
CH  No.   :    38     (RX  Freq    =   160.500,    TX  Freq   =   

5 - 3
to an RS-232C portPersonal
computer
to [MIC]
to [SP]
JIG cableDB9 female plug
(incl. level converter circuit)
• CONNECTION
to the antenna connector
RF power meter
0.1–10 W/50 ½
Frequency
counter
Attenuator
40 dB or 50 dBFM
deviation meter
Standard signal generator
0.1 µV to 32 mV
(–127 dBm to –17 dBm)
CAUTION:
DO NOT transmit while
SSG is connected to the
antenna connector.
SINAD meterSpeaker (8 ½)
Audio generator
OPC-478
DC POWER
SUPPLY • DC POWER CABLE CONNECTIONS
SOFTWARE ADJUSTMENT PLL...

5 - 4
5-2 PLL ADJUSTMENT
PLL LOCK
VOLTAGE1
2• Operating frequency: 146.000 MHz
• Receiving
• TransmittingMAIN Connect a digital multi
meter to check point
LV.2.0 V
1.5–2.5 V MAIN L11
Verify ADJUSTMENT ADJUSTMENT CONDITIONS
UNIT LOCATIONVALUE
UNIT ADJUST MEASUREMENT ADJUSTMENT
L11
PLL lock voltage
adjustment
LV
PLL lock voltage
check point
• MAIN unit
Bottom view
RF power meter 

5 - 5
1
2
1
2
1
1• Operating frequency: 146.000 MHz
• High/Low switch : Low
• Connect the RF power meter or 50 ½
dummy load to the antenna connector.
• Transmitting
• Transmitting
• Operating frequency: 146.000 MHz
• High/Low switch : Low
• Transmitting
• High/Low switch : High
• Transmitting
• Operating frequency: 146.000 MHz
• High/Low switch : Low
• Connect the audio generator to the
[MIC] jack and set as: 
1.0 kHz/150 mVrms
• Set the FM deviation meter as:
HPF : OFF
LPF : 20 kHz
De-emphasis : OFF...

5 - 6
Minimum distortion
level
12 dB SINAD
At the point where
the audio signals
just appears. 1 • Operating frequency: 146.000 MHz
• Connect a standard signal generator to
the antenna connector and set as:
Frequency : 146.000 MHz
Level :
3.2 µV* (–97 dBm)
Modulation : 1 kHz
Deviation : ±3.5 kHz (W-type)
±1.75 kHz (N-type)
• Receiving
• Operating frequency: 146.000 MHz
• Connect a standard signal generator to
the antenna connector and set as:
Frequency : 146.000 MHz
Level : OFF
Modulation : 1 kHz...

6 - 1S.=Surface mount
IC1 1130007610 S.IC µPD3140GS-E1 (DS8) 
IC2 1110003490 S.IC TA31136FN (D,EL) 
IC3 1110003780 S.IC NJM2902V-TE1
IC4 1130008090 S.IC BU4066BCFV-E1
IC5 1110001810 S.IC TA7368F (TP1) 
IC6 1180001740 S.IC TK11250BMCL
IC7 1130009680 S.IC HN58X2432TI
IC8 1140003750 S.IC HD6473877H (Z-TAT) 
IC10 1190000350 S.IC M62363FP-650C
IC11 1130009110 S.IC S-80942ANMP-DD6-T2
IC12 1110003800 S.IC NJM2904V-TE1
Q1 1560001050 S.FET 2SK2974
Q2 1560001020 S.FET 2SK2973 (MTS101P) 
Q3 1530003230 S.TRANSISTOR...

6 - 2S.=Surface mount
R58 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 k½) 
R59 7030003400 S.RESISTOR ERJ3GEYJ 471 V (470 ½) 
R61 7030003280 S.RESISTOR ERJ3GEYJ 470 V (47 ½) 
R62 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 k½) 
R63 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 k½) 
R64 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 k½) 
R65 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 k½) 
R66 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 k½) 
R67 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 k½) 
R68 7030003520 S.RESISTOR...

6 - 3S.=Surface mount
R241 7030003800 S.RESISTOR ERJ3GEYJ 105 V (1 M½) 
R242 7030003800 S.RESISTOR ERJ3GEYJ 105 V (1 M½) 
R243 7030003800 S.RESISTOR ERJ3GEYJ 105 V (1 M½) 
R244 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 k½) 
R245 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 k½) 
R246 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 k½) 
R249 7030003640 S.RESISTOR ERJ3GEYJ 473 V (47 k½) 
R251 7030003740 S.RESISTOR ERJ3GEYJ 334 V (330 k½) 
R252 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 k½) 
R253 7030003400 S.RESISTOR...