Icom Ic4008a/Mk2 Uhf Fm Tranciever Service Manual

5 - 1
SECTION 5 ADJUSTMENT PROCEDURES
5-1 PREPARATION
REQUIRED TEST EQUIPMENT
EQUIPMENT
DC power supply
RF power meter
(terminated type)
Frequency counter
FM deviation meter
DC voltmeter
GRADE AND RANGE
Output voltage : 4.5 V DC
Current capacity : 1 A or more
Measuring range : 1 mW–1 W
Frequency range : 300–600 MHz
Impedance : 50 ½
SWR : Less than 1.2 : 1
Frequency range : 0.1–600 MHz
Frequency accuracy : ±1 ppm or better
Sensitivity : 100 mV or better
Frequency range : 30–600 MHz
Measuring range : 0 to...

5 - 2
5-2 ADJUSTMENT
REFERENCE
FREQUENCY
OUTPUT
POWER
FM
DEVIATION
SQUELCH
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITIONMEASUREMENT
VALUEPOINT
UNIT LOCATION UNIT ADJUST
433.925000 MHz
9 mW [ITA/–1]
470 mW [CSA/–1]
±4.8 kHz
10 mV ±3 dB
Audio signal
disappears. 1
1
1
2
1
2• Operating channel : Ch 35
• Transmitting
• Operating channel : Ch 35
• Transmitting
• Operating channel : Ch 01
• Connect an audio generator to the
[MIC] jack and set as:
1 kHz/100 mV rms
• Set an FM deviation meter as:
HPF : OFF
LPF : 20...

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RF
GNDJ1
RF test por
R50
FM deviati Reference frequency
adjustmentR206Output power
adjustment
TEST
C63
ENTERING THE ADJUSTMENT MODE

q Turn the transceiver power OFF.
w While connecting the TEST to GND, 
     then turn power ON.  

SECTION 6 PARTS LIST
6 - 1
IC1 1140006881 S.IC µPD753036GK-524-BE9
IC2 1110002820 S.IC NJM2100M-T1
IC3 1140004450 S.IC X24C01AS-3.0T6
IC5 1110004710 S.IC S-80928ANMP-DDR-T2
IC6 1180001150 S.IC S-81230SG-QB-T1
IC9 1110002810 S.IC NJM2070M-T1
Q1 1590000720 S.TRANSISTOR DTA144EUA T106
Q2 1590001860 S.TRANSISTOR UN9215 (TX) 
Q3 1590000800 S.TRANSISTOR UN5119 (TX) 
Q5 1510000580 S.TRANSISTOR 2SA1362-GR (TE85R) 
Q6 1560000840 S.FET 2SK1829 (TE85R) 
Q7 1530002280 S.TRANSISTOR 2SC4081 T107 S
Q10 1530002280...

6 - 2
C8 4510004630 S.ELECTROLYTIC ECEV1CA100SR
C9 4030006850 S.CERAMIC C1608 JB 1H 471K-T-A
C10 4030006850 S.CERAMIC C1608 JB 1H 471K-T-A
C11 4030006850 S.CERAMIC C1608 JB 1H 471K-T-A
C15 4030011600 S.CERAMIC C1608 JB 1C 104KT-N
C17 4550006880 S.TANTALUM TEMSVD2 0J 157M-12R
C18 4510004630 S.ELECTROLYTIC ECEV1CA100SR
C20 4030011600 S.CERAMIC C1608 JB 1C 104KT-N
C21 4030011600 S.CERAMIC C1608 JB 1C 104KT-N
C24 4030008900 S.CERAMIC C1608 JB 1C 333K-T-A
C25 4030006850 S.CERAMIC C1608 JB 1H 471K-T-A
C26...

6 - 3
L206 6200005690 S.COIL ELJRE 18NG-F
L207 6200005690 S.COIL ELJRE 18NG-F
L208 6200003640 S.COIL MLF1608K 100K-T
R1 7030003430 S.RESISTOR ERJ3GEYJ 821 V (820 ½) 
R2 7030003670 S.RESISTOR ERJ3GEYJ 823 V (82 k½) 
R3 7030003470 S.RESISTOR ERJ3GEYJ 182 V (1.8 k½) 
R4 7030003450 S.RESISTOR ERJ3GEYJ 122 V (1.2 k½) 
R5 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 k½) 
R6 7030003520 S.RESISTOR ERJ3GEYJ 472 V (4.7 k½) 
R7 7030003280 S.RESISTOR ERJ3GEYJ 470 V (47 ½) 
R10 7030003550 S.RESISTOR ERJ3GEYJ 822 V (8.2...

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C211 4030006860 S.CERAMIC C1608 JB 1H 102K-T-A
J1 6910007660 CONNECTOR IMSA-9210B-1-02T
J2 6510018170 S.CONNECTOR 4-175643-4
W4 7030003860 S.JUMPER ERJ3GE JPW V
W5 7030003860 S.JUMPER ERJ3GE JPW V
W6 7030003860 S.JUMPER ERJ3GE JPW V
W8 7030003860 S.JUMPER ERJ3GE JPW V
W201 7030003860 S.JUMPER ERJ3GE JPW V
W202 7030003860 S.JUMPER ERJ3GE JPW V
EP1 0910050351 PCB B 5162A [ITA], [ITA-1]
0910050781 PCB B 5162A [CSA], [CSA-1]
REF ORDER
DESCRIPTION
NO. NO.
[RF UNIT]
S.=Surface mount 

SECTION 7 MECHANICAL PARTS AND DISASSEMBLY
7 - 1
Screw abbreviationsA, B0, BT:  Self-tapping
PH: Pan head
FH: Flat head
BiH: Bind head
NI: Nickel
SUS: Stainless
ZK: Black
SP1 2510000960 Speaker K036NA500-26A27 1
EP1 3310002090 Antenna 2045ANT 1
MP1 8210015181 Panel 2045 Front Panel-1  [ITA], [CSA] 1
8210016101 Panel 2045 Front Panel (A)-1 1
[ITA-1], [CSA-1]  
MP2 8210015191 Panel 2045 Rear Panel-1 [ITA], [CSA] 1
8210016111 Panel 2045 Rear Panel (A)-1 1
[ITA-1], [CSA-1]
MP3 8110006400 Cover 2045 Rear...

7 - 2
UNIT abbreviation(C): CHASSIS PARTS, (RF): RF UNIT, (M): MAIN UNIT
MP1 (C)
SP1 (C) MP10 (C)
MP12 (C) EP1 (M) DS2 (M)MP7 (C)
MP5 (C)MAIN unit MP20 (C)
MP25 (C)MP14 (C) MP23 (C) MP11 (C)
MP13 (C)
MP4 (C)MP2 (C) MP25 (C)MP9 (C)MP8 (C)
RF unit
MP24 (C) MP30 (C) MP24 (C) MP22 (C)EP1 (C)
MP3  (C) MP1  (RF) 

SECTION 8 SEMI-CONDUCTOR INFORMATION
8 - 1
• DIODES • TRANSISTOR AND FET’S2SA1362 GR
(Symbol: AEG)
2SC4213 B
(Symbol: AB)2SC5108 Y
(Symbol: MC)
DTA114 EU
(Symbol: 16)
UN5119
(Symbol: 6K)
UN9215
(Symbol: 8E)DTC114 EU
(Symbol: 14)MRF9745
(Symbol: M745)UMZ1N
(Symbol: Z1)UMZ2N
(Symbol: Z2) 2SC5194
(Symbol: T88)2SJ144 Y
(Symbol: VX)2SK1829
(Symbol: K1) 2SC4215 O
(Symbol: QO)2SC4226 R25
(Symbol: R25)2SC4228 R44
(Symbol: R44) 2SA1586 GR
(Symbol: SG)2SB798 DK
(Symbol: DK)2SC3356  R24
(Symbol: R24)2SC4081 S...