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11-2 RF UNIT

11 - 2

T: 0
R: 0.72

T: 0
R: 1.83

T:  0
R:  2.60

T: 0
R: 1.72

T: 0
R: 2.94

T: 0
R: 0.77

T: 0
R: 2.28

T: 0
R: 0.27

T: 0
R: 2.19

C: 2.82

T: 0
R: 0.97

T: 0
R: 1.84

T: 0
R: 1.85

C: 4.5

C: 3.02

C: 2.99

C: 3.06

C: 0.75

C: 0.70

T: 2.24
R: 0

T: 0.85
R: 0

T: 2.85
R: 0.01

C: 1.89

C: 1.22

T: 0
R: 0.75

T: 0.85
R: 0

T: 1.67
R: 0

T: 1.45
R: 0.40

T: 0
R: 1.14

T: 0.46
R: 0.84

T: 2.95
R: 0

T: 2.37
R: 0

T: 1.78
R: 0

T:  3.64
R:  0

T:  0
R:  2.94

C: 2.47

T:  0
R:  0.98

CHASSIS

EP1

C73
0.1

C74
470 P

C75
470 P

R51
560 k

1

2

3

4

5

FI3
CFWM450G

R52
1.5 k

R53
150 k

2nd-Lo (21.25 MHz)

R1
820

C1
0.001

Q1
2SC4215 O

FI2
FL-297

C2
0.047

C79
10

R3
1 k

C47
22 P

R2
82 k

C101
1 P

EP2   MMZ1608D121B

C28
470 P

R6
4.7 k

C35
0.001

C3
0.047

R303
47 k

R304
270

C212
0.001

R310
330 k

L209
0.1 

µ

H

R19
330

L1
2.2 

µ

H

C46
12 P

R4
560

C36
8 P

C219
5 P

C13
47 P

L211
27 nH

Q2
3SK284

R7
47

C5
470 P

C6
470 P

C65
470 P

R25
33 k

L4
12 nH

1

2

FI1
NSVS647

D102
MA2S077

L3
18 nH

C32
6P

R16
33

Q3
2SC4226 R25

C7
22 P

R+3

1st LO

C8
6 P

C12
8 P

C11
0.75 P

C9
1.5 P

C10
10 P

L206
18 nH

L6
17 nH

L5
17 nH

D101
MA2S077

C209
6P

C210
7 P

C30
7 P

C44
27 P

L10
22 nH

D7
MA2S077

C31
7 P

RF TEST PORT

1

2

J1

C72
470 P

L205
68 nH

L23
15 nH

R209
220

R+3

C202
22 P

C207
8 P

C208
9 P

L204
8.2 nH

C206
0.001

R207
1 k

C205
0.001

Q202
XRF9482

R205
10 k

R206
10 k

L203
39 nH

R301
8.2 k

C21
470 P

C26
470 P

C201
470 P

Q8
2SC4228 R44

L202
33 nH

L201
22 nH

W202

Q201
2SC3356 R24

W201

C203
22 P

R213
220

R86
68

L21
22 nH

C204
6 P

T+3

C23
7 P

R202
22 k

D2
MA77

C70
470 P

D1
MA77

R12
1 k

R208
1 k

R37
22 k

C102
2 P

C88
10

C16
470 P

R305
3.9 k

C62
0.033

R45
8.2 k

C68
0.68

R306
8.2 k

R10
8.2 k

C17
0.033

C61
5 P

R88
4.7 k

R313
10

R302
10 k

VCC1

1

IN1

2

ENB

3

CLK

4

DATA

5

T1

6

LOK

7

CP1

8

FI1

9

FO1

10

FO2

11

FI2

12

CP2

13

GND2

14

XO

15

XI

16

XB

17

VCC2

18

IN2

19

GND1

20

IC1

µ

PD3140GS

R27
100 k

R55
15 k

R56
15 k

R59
15 K

C76
440 P

IC2
TA31136FN

C77
22 P

C78
68 P

R58
4.7 k

R54
10 k

X2
CDBCA450CX24

C81
0.047

C83
1

R61
10 k

C67
0.1

R57
2.2 k

C82
0.1

R60
100 k

C80
0.22

C48
22 P

R50
47 k

C20
470 P

C64
0.22

R30
33 k

C85
4.7

R29
47

C42
10 P

C63
10 P

Q12
2SC5006

X1
CR-669

C43
18 P

C215
470 P

R31
33 k

Q7
2SC5108 Y

C53
1.5 P

R33
8.2 k

L12
10 

µ

H

C55
470 P

L11
10 

µ

H

D5
1SV284

D4
1SV284

C56
0.5 P

L14
33 nH

C51
12 P

C50
12 P

L13
27 nH

R35
47 k

R36
220

C54
3.5 P

R34
680

C52
2 P

C57
2 P

Q6
2SC5108 Y

L15
82 nH

D103
MA2S728

L208
10 

µ

H

C216
1.5 P

C69
0.001

L210
33 nH

W5

C218
470 P

R312
82 k

Q203
2SC5108 Y

R311
470

C217
6 P

R62
18

Q14
2SA1586 GR

R93
10

C84
470 P

C60
22

D8
1SS355

D9
1SS355

R64
56

Q13
2SC4081 S

1

2

3

4

5

6

7

8

9

10

11

12

13

14

to MAIN unit J4

J2

C95
470 P

R83
10 k

L25
4.7 

µ

H

MOD

T+3

PSC

R+3

BATT

VOL

C91
0.047

R75
10 k

Q16
2SC4081 S

C96
470 P

C92
0.01

R73
680 k

C93
0.01

AF

STB

DATA

CK

SENS

SQL

SHIFT

C90
0.01

R68
390 k

R71
10 k

Q15
2SC4081 S

R69
3.9 k

C89
0.0068

R66
12 k

R67
680 k

R74
390 k

R76
3.9 k

R70
27 k

R72
8.2 k

C86
0.22

R65
3.3 k

C87
0.1

FILIN

FILOUT

BIAS

IFIN

VDD

MIXOUT

OSCOUT

OSCIN

AFOUT

Q

U

ADIN

IFOUT

SOUT

NDET

NOUT

VSS

MIXIN

9

10

11

12

13

14

15

16

8

7

6

5

4

3

2

1

3

4 5 6 7 8

T: TX
R: RX
C: COMMON

Summary of Contents for PMR446

Page 1: ...SERVICE MANUAL PMR446 FM TRANSCEIVER...

Page 2: ...M2x6 ZK IC 446S Chassis 10 pieces Addresses are provided on the inside back cover for your convenience 1 Make sure a problem is internal before disassembling the transceiver 2 DO NOT open the transce...

Page 3: ...SUPPLY CIRCUITS 4 3 4 5 PORT ALLOCATIONS 4 3 SECTION 5 ADJUSTMENT PROCEDURES 5 1 PREPARATION 5 1 5 2 PLL AND TRANSMITTER ADJUSTMENTS 5 2 5 3 RECEIVER ADJUSTMENT 5 3 SECTION 6 PARTS LIST SECTION 7 MECH...

Page 4: ...iving system Double conversion superheterodyne Intermediate frequency 1st 21 7 MHz 2nd 450 kHz Sensitivity 12 dB SINAD Less than 0 25 V 12 dB V Adjcent chnnel selectivity 55 dB Spurious response 65 dB...

Page 5: ...amplifier IC9 NJM2070M EEPROM IC3 AT24C02N CPU IC1 PD753036GK 3 Regurator IC6 S 81230SG TOP VIEW BOTTOM VIEW 1st mixer Q2 3SK284 Reference oscilletor X1 CR 669 21 25MHz PLL IC IC1 PD3140GS TOP VIEW BO...

Page 6: ...L 1 Unscrew 1 screw A and 4 screws B 2 Remove the rear panel in the direction of the arrow REMOVING THE RF UNIT 1 Remove 1 knob C and unscrew 1 nut D 2 Then remove the RF unit REMOVING THE MAIN UNIT 1...

Page 7: ...applied to the 2nd mixer circuit 4 1 4 2ND MIXER AND DEMODULATOR CIRCUITS RF UNIT The 2nd mixer circuit converts the 1st IF signal into a 2nd IF signal A double conversion superheterodyne system whic...

Page 8: ...cuit modulates the VCO oscillating signal RF signal using the microphone AF signals The filtered audio signals from the MAIN unit are passed through the deviation adjustment pot R50 and are then appli...

Page 9: ...EPROM IC3 Outputs data signals to the EEPROM IC3 Output port for power save function applied to VCO regurator circuit RF unit Q13 Q14 D8 D9 Outputs the R 3 regulator control sig nal Q25 D4 Outputs the...

Page 10: ...C millivoltmeter External speaker Attenuator GRADE AND RANGE Frequency range 300 3000 Hz Measuring range 1 500 mV Frequency range 0 1 600 MHz Output level 0 1 V 32 mV 127 to 17 dBm Frequency range DC...

Page 11: ...or to the MIC jack and set as 1 kHz 100 mV rms Set an FM deviation meter as HPF OFF LPF 20 kHz or 15 kHz De emphasis OFF Detector P P 2 Transmitting Set group No OFF Set an audio generator output leve...

Page 12: ...UNIT LOCATION Audio signal disappears 1 2 Operating channel Ch 04 Connect an SSG to J1 on the RF unit and set as Frequency 446 04375 MHz Level 0 14 V 124 dBm Modulation OFF Receiving Set an SSG as Le...

Page 13: ...RJ3GEYJ 104 V 100 k R63 7030003530 S RESISTOR ERJ3GEYJ 562 V 5 6 k R64 7030003590 S RESISTOR ERJ3GEYJ 183 V 18 k R65 7030003590 S RESISTOR ERJ3GEYJ 183 V 18 k R66 7030003590 S RESISTOR ERJ3GEYJ 183 V...

Page 14: ...ESISTOR ERJ3GEYJ 333 V 33 k RF UNIT MAIN UNIT S Surface mount C34 4030006880 S CERAMIC C1608 JB 1H 472K T A C35 4030011600 S CERAMIC C1608 JB 1C 104KT N C36 4030006860 S CERAMIC C1608 JB 1H 102K T A C...

Page 15: ...006980 S CERAMIC C1608 CH 1H 070D T A C31 4030006980 S CERAMIC C1608 CH 1H 070D T A C32 4030006970 S CERAMIC C1608 CH 1H 060D T A C35 4030006860 S CERAMIC C1608 JB 1H 102K T A C36 4030006990 S CERAMIC...

Page 16: ...30045220 2045 BATT seal 1 MP14 8930046280 2045 ANT termainal 1 MP15 8930045350 2045 A terminal 1 MP16 8930045360 2045 B terminal 1 MP17 8930045370 2045 C terminal 2 MP19 8930045740 2045 sheet 1 MP20 8...

Page 17: ...RF RF UNIT MP1 C SP1 C MP10 C MP12 C EP1 M DS2 M MP7 C MP5 C MAIN unit MP20 C MP25 C MP4 RF MP14 C MP17 C MP2 RF MP16 C MP23 C MP5 RF MP11 C MP13 C MP4 C MP2 C MP15 C MP25 C MP9 C MP8 C RF unit MP24...

Page 18: ...ol K1 3SK284 Symbol U1 2SC4215 O Symbol QO 2SC4226 T2 R25 Symbol R25 2SC4228 T2 R44 Symbol R44 2SC5006 T1 Symbol 24 2SA1586 GR Symbol SG 2SB798 T2 DK Symbol DK 2SC3356 R24 T2B Symbol R24 2SC4081 T107S...

Page 19: ...C74 R49 R200 R201 R114 R115 R119 R204 W3 R98 C53 C60 C81 R74 R76 C63 R23 R80 R78 C88 W7 C90 C62 R102 R12 C35 C34 R10 C25 C3 R9 R31 R202 R118 R110 R45 R36 C36 C31 R42 R41 C32 R38 R46 C7 R13 C4 C79 R50...

Page 20: ...C85 C99 R2 R30 C1 R39 C73 R40 R64 W2 R5 R53 C24 C98 C93 R52 R51 C83 Q2 Q12 Q1 Q29 R32 R35 C28 C91 C10 R14 C51 R62 R103 R101 R117 R105 R203 R108 R100 R96 R57 C26 R34 C40 R95 C11 R33 C27 R7 R6 C29 C6 I...

Page 21: ...D8 C86 C48 C61 C69 R10 W5 L15 R45 C16 C26 C23 R27 R64 R302 R215 R205 D103 C206 R209 R202 C202 W202 L205 C207 C208 L201 W201 C201 C203 C204 L202 R213 R305 L208 R313 R306 C67 R12 C70 R65 R93 R62 C87 R1...

Page 22: ...0 R206 Q12 C84 Q7 C56 Q6 C51 D4 D5 L13 L12 C32 R70 J1 FI3 FI2 B5421B R72 C6 L3 R7 R75 R76 Q16 R74 C93 C92 C91 D102 D101 C210 C209 R207 C205 R301 L206 R83 C5 C95 R73 R16 R25 C7 L4 R30 R29 C20 L11 C53 C...

Page 23: ...4EU LPF IDC 3V IC2A NJM2100M Q6 2SK1829 MIC MUTE IC2B NJM2100M Q23 2SJ144 R58 AF VOL VOL MUTE MC1 KUC3523 PTT SENSE MIC SW MIC R 3 CURRENT AMP R 3 T 3 3V CURRENT AMP Q25 UMZ2N D4 1SS355 3V to LOGIC 3...

Page 24: ...COM0 COM1 COM2 COM0 COM1 COM2 DS2 LD BU10503J R65 18 k R66 18 k R64 18 k 3 V SHIFT VOL CK DATA STB AF SENS SQL MOD PSC R 3 T 3 BATT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 J4 8 IC2a NJM2100M R30 15 k C73 0...

Page 25: ...4 6 P T 3 C23 7 P R202 22 k D2 MA77 C70 470 P D1 MA77 R12 1 k R208 1 k R37 22 k C102 2 P C88 10 C16 470 P R305 3 9 k C62 0 033 R45 8 2 k C68 0 68 R306 8 2 k R10 8 2 k C17 0 033 C61 5 P R88 4 7 k R313...

Page 26: ...om france com Crta de Gracia a Manresa Km 14 750 08190 Sant Cugat del Valles Barcelona SPAIN Phone 93 590 26 70 Fax 93 589 04 46 URL http www icomspain com Corporate Headquarters 2380 116th Avenue N E...

Page 27: ...COVER 99 12 18 8 39 AM Page 1...

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