Icom IC-T7H Service Manual Download

Page: 35 / 37

• 2F UNIT

C400
0.001

R403
56

R407
4.7 k

C109
0.001

C122
0.047

R121
47 k

Q103
2SD2216 S

Q105
UN9115

R120
22 k

R122
220 k

C121
0.01

C113
0.001

R119
100

R118
1 k

R116
470

Q104
2SD2216 S

R114
10 k

C126
0.1

C120
0.01

R117
47 k

R115
330 k

Q102
XP1501 AB

C118
22 P

C111
470 P

C112
470 P

R106
220 k

R103 1 k

C110 0.1

R104
82 k

3 4 5

FI101
CFWM450E

C403
0.001

FI401
FL-244

R414
470

C412
2.5 P

L403
1.8

R410
1 k

Q401
2SC4403 3

Q403
UN9115

L204
12 nH

R205
330

C416
0.001

R415
120 k

C206
0.001

R207
4.7 k

D203
MA2S077

C207
22 P

C202
120 P

L202
18 nH

C203
10 P

R202
150

C204
0.001

R203
220

R204
68 k

R201
33 k

R206
3.3 k

Q400
2SC5107 O

C405
0.001

L400
0.1

R404
27 k

C406
0.001

C407
0.001

R405
82

D403
MA2S077

L401
6.8 nH

D404
MA2A077

R408
4.7 k

R406
120

C402 2 P

C408 15 P

1
3
5
7
9
11
13
15
17
19
21
23
25
27
29

J1 IL-WX-30SB-VF-B

AF
UMOD

VMOD

EXTMIC
SPE

GND

REMOTE

C404
0.001

R401
4.7 k

PLST
PLCK

SHIFT
TXC

AFV
PSET

HVCO
HV

PREF

+3C

DIUD
DICK

TXSEL

BTVCC

C802
0.001

C803
0.001

C800
0.001

C801
0.001

L201
15 nH

C604
0.001

R603
22 k

J3
52365-0690

C201
0.001

800M

GND

URF

D202
MA2S077

R601
4.7 k

D602
MA2S077

C601
0.001

R602
3.3 k

D201
1SV271

D601
MA2S077

Q201
2SC4226 R25

L203
12 nH

L603
15 nH

R604
330

R605
100

L605
10 nH

L604
10 nH

L606
22 nH

C613
0.001

D603
MA2S077

R606
2.2 k

Q601
2SC4228 R45

C205
0.001

FI201
EFCH445MWNP1 [USA-3]
EFCH435MWNP1 [Other]

C607
2 P

C608
2 P

C609
2 P

L607
22 nH

GND

IN 1

OUT

GND

VCC

IC601
UPC2748T

D604
MA2S077

D607
MA2S077

R610
2.2 k

C616
0.001

C618
0.001

Q202
2SC4403 3

R612
4.7 k

D400
MA2S077

D606
MA2S077

L609
47 nH

R402
100 k

C617
7 P

C411
5 P

C413
0.01

C410
0.001

R411
680

C107
10 P

C115
0.001

C103
0.001

C102
0.001

L101
1.8

R102
470

R101
47 k

C101
0.001

Q101
2SC4215 O

OSCIN

OSCOUT

MIXOUT

VCC

IFIN

DEC

FILOUT

FILIN

AFOUT

QUAD

IFOUT

RSSI

N-DET

N-REC

GND

MIXIN

IC101
TA31136FN(D)

L102
LS-510

IC102
TC4S66F

R112
470

C116
0.001

R105
1.5 k

R123
1 M

C123
0.22

C125
0.001

C119
0.1

C117
0.047

C501
47 P

C124
4.7

C114
0.01

R113
10 k

R108
15 k

R502
10

R107
22 k

R505
15 k

R506
15 k

R504
20 k

R111 22 k

R110
22 k

800

300

D401
MA132WA

R64 10 k

Q53
UN9115

D605
MA132WK

Q602
XP1115

C621
0.001

C622
0.001

R62
10 k

R63 10 k

C606
0.001

R608
4.7 k

R609
100 k

C615
0.001

C614
0.001

R607
100 k

C605
0.001

C610
8 P

C611 1.5 P

C612
5 P

C620
0.001

R61
10 k

D101
MA2S077

C56
0.001

R51
68 k

D52 MA304

Q51
2SC5226 4

C58
0.001

R52 100 k

C59
0.001

R53
68

L53 LS-518

VRF

C55 0.001

C54
10 P

D55 1SV271

C69
9 P

C57
12 P

R57
33 k

C60
0.001

R56 10 k

R55
330

R54 100

Q52
2SC4403 3

R58
47

C61
0.001

C70
0.001

D103
MA2S077

D102
MA2S077

D54
MA304

R59
100 k

R60
100 k

C66
0.001

C71
9 P

C72
6 P

C64
1 P

C65
1 P

D53
MA304

L54
LS-518

C63
15 P

C67
5 P

C68
0.001

Q404
UN9115

R409
4.7 k

L55
LS-518

UR3

VR3

D402
MA132WA

C415
0.001

C414
0.001

C106
0.1

NOISE

DETO

C155
0.001

R153
4.7 k

C151
220

R151
10

IC151 TA7368F

AFON

R152
150

Q4
XP1501 AB

R5
10 k

C409
0.001

C11
2.2

C12
0.001

R903 22

R904 22

D902
MA133

Q5
2SA1588 GR

C914
0.001

Q901
2SB1132 R

C910
0.001

C913
0.001

D904
SB07-03C

C901
0.001

C916
0.001

C62
0.001

R309
10

R313
10 k

R316
10 k

VTUNE

+3C

R302
20 k

R304 20 k

R311
5.6 k

R303
68 k

R305
47 k

PSET

VCC

1
2
3
4

IC301
TC4W53FU

C302
0.001

R306
470 k

C300
0.001

C301
0.001

R312
47 k

Q306
UN9213

R315
10 k

Q307
XP1114

C303
0.001

R314
47 k

Q309
UN9114

R301
6.8 k

R300
TBPS1R104K475H5Q

D301
MA2S111

D302 MA2S111

Q310
UN9210

Q305
UN9210

Q308 XP1213

R310
10 k

CHG

R906
10 k

R905
100 k

C912
0.001

C900
0.001

R308
47 k

C915
0.001

1
2
3
4

6
5

Q902
HAT1024R

D903
MA2S728

C911
0.001

C902
0.001

C161
0.001

C152
0.047

C154
47 P

Q151
2SB1201 S

C156
47

R159
1 k

R161
5.6 k

Q152
XP1501 AB

R158
10 k

C153
3.3

R162
100 k

C157
4.7

C160
100

R160
5.6 k

R157
10

R156
10

R155
10

800

PDA/UL

UR3
VR3

HVCO
TXC

PLCK

J2 08-6210-030-800

DICK
DIUD

REMOTE

+3C

VCC

DETO

SD
GND

H/L
TXSEL

NOISE

C923
0.001

C921
0.001

C922
0.001

C920
0.001

C919
0.001

C918
0.001

C917
0.001

AFV

SPE

C158
0.001

C159
0.001

C162
0.001

AFO

VCC

MOD

H/L

UMOD

VMOD

TXSEL

BTVCC

300
AF
MOD
EXTMIC
SPE
INTSP
AFON
PLST

LVCO

SHIFT

GND

2
3
4
5

PDA/UL
GND
2NDLO

VCC

INTSP
AFO

VTUNE
LVCO

: COMMON

: VHF TX

: UHF TX

: VHF RX

: UHF RX

VTH

: VHF TX HI-POWER

VTL

: VHF TX LOW-POWER

UTH

: UHF TX HI-POWER

UTL

: UHF TX LOW-POWER

SQLO : SQL OPEN
SQLC : SQL CLOSE

VT: 0
UT: 0
VR: 0.5
UR: 0.5

VT: 0
UT: 0
VR: 2.3
UR: 2.3

VT: 0
UT: 0
VR: 3.1
UR: 3.1

UT: 0
UR: 2.3

UT: 0
UR: 2.4

UT: 0
UR: 0.78

UT: 0
UR: 0.75

VT: 0
UT: 0
VR: 0.7
UR: 0.7

VTH: 9.6
VTL: 9.8
UTH: 9.6
UTL: 9.8
VR: 13.2
UR: 13.2

VT: 0
VR: 0.9

VT: 0
VR: 1.5

VT: 0
VR: 3.1

VT: 0
VR: 2.3

VT: 0
UT: 0
VR: 3.1
UR: 3.1

VT: 0
UT: 0
VR: 0.7
UR: 0.7

VT: 0
UT: 0
VR: 3.6
UR: 3.6

C: 13.2

SQRO: 5.7
SQLO: 0

VTH: 10.5
VTL: 10.8
UTH: 10.6
UTL: 10.9
VR: 13.1
UR: 13.1

VTH: 12.1
VTL: 12.4
UTH: 0
UTL: 0
VR: 12.5
UR: 0

VTH: 0
VTL: 13.0
UTH: 0
UTL: 12.9
VR: 0
UR: 0

UTH: 12.4
UTL: 12.9
UR: 13.2

VTH: 12.2
VTL: 12.6
VR: 13.2

11 - 3

Summary of Contents for IC-T7H

Page 1: ...SERVICE MANUAL DUAL BAND FM TRANSCEIVIER...

Page 2: ...IC T7H 1F UNIT 5pieces 8810008750 Screw PH BO 2 x 15 ZK IC T7H Chassis 10pieces Addresses are provided on the inside back cover for your convenience 1 Make sure a problem is internal before disassemb...

Page 3: ...CIRCUITS 4 4 4 5 OTHER CIRCUITS 4 4 4 6 PORT ALLOCATIONS 4 5 SECTION 5 ADJUSTMENT PROCEDURES 5 1 PLL AND TRANSMITTER ADJUSTMENT 5 1 5 2 RECEIVER ADJUSTMENT 5 3 SECTION 6 PARTS LIST SECTION 7 MECHANICA...

Page 4: ...174 MHz 1 136 MHz 174 MHz 1 400 MHz 470 MHz 3 F3 F2 5 ppm 5 10 12 5 15 20 25 30 or 50 kHz BNC 50 4 5 to 16 V DC 1 6 A typical 1 6 A typical 0 6 A typical 0 7 A typical 180 mA typical 190 mA typical 16...

Page 5: ...UHF band pass filter FI201 EFCH445MWN UHF RF amplifier Q201 2SC4226 Located under side of these points AF power amplifier IC151 2SC5226 VHF RF amplifier Q51 2SC5226 1st IF filter FI401 FL244 2nd IF f...

Page 6: ...n below REMOVING 2F UNIT 1 Unscrew 1 screw E from the 2F unit 2 Unsolder the point F then remove the 2F unit with the contact base Disconnect J1 on reverse side of the 2F unit to remove Rear panel C F...

Page 7: ...imit ter D201 and are then amplified at the the RF amplifier Q201 The amplified signals are passed through the band pass filter FI201 and are then applied to another RF ampli fier Q202 The amplified s...

Page 8: ...etects the signal level from the number of the pulses and outputs an MM RM signal from IC1 pin 44 on LOGIC unit This signal controls the AF mute switch LOGIC unit Q10 to cut the AF signal line 4 2 TRA...

Page 9: ...2 and Q204 are turned ON The signal passes through the low pass L7 L9 C9 C15 and high pass L1 L3 C1 C5 filters and is then applied to the antenna connector The high pass filter sup presses low harmoni...

Page 10: ...ltage is supplied to the 3C R3 and T4 regulator circuits etc Common 3 V converted from the VCC line by the 3C regulator circuit LOGIC unit Q4 Q5 Q40 and D3 using the 3CPU regulator LOGIC unit IC2 3 V...

Page 11: ...ow POWER switch is pushed Outputs LCD contrast control signals Input port for key matrix Input port for the PTT control circuit HIGH When transmitting Input port for reset circuit LOGIC unit IC3 pin 1...

Page 12: ...as HPF OFF LPF 20 kHz De emphasis OFF Detector P P 2 Output power High Transmitting Displayed frequency 445 000 MHz USA 3 435 000 MHz Other Output power High Transmitting Displayed frequency 445 000...

Page 13: ...QUENCY COUNTER 100 MHz 500 MHz 1F UNIT 2F UNIT RF POWER METER 10 W 50 FREQUENCY COUNTER 100 MHz 500 MHz R302 R304 VHF output power adjustment High UHF output power adjustment High ATTENUATOR 40 or 50...

Page 14: ...dBm Modulation 1 kHz Deviation 3 5 kHz Pre set the R504 to maxmum CW Receiving Displayed frequency 443 000 MHz USA 3 433 000 MHz Other Connect an SSG to the antenna connector and set as Level 0 5 V 1...

Page 15: ...R SSG 100 500 MHz 127 to 17 dBm 0 1 V to 32 mV CAUTION DO NOT transmit while the signal generator is connected L102 CP1 UHF sensitivity adjustment UHF sensitivity check point L53 L54 L55 VHF sensitivi...

Page 16: ...F15NK L702 6200005830 S COIL NLH252018T 012J 12N L703 6200004380 S COIL LL1608 F18NK L723 6200008080 S COIL LQN21A R22J04 L724 6200008080 S COIL LQN21A R22J04 L725 6200008080 S COIL LQN21A R22J04 L801...

Page 17: ...S CERAMIC C1005 JB 1E 102K T A C358 4030009810 S CERAMIC C1005 JB 1E 102K T A C359 4030009810 S CERAMIC C1005 JB 1E 102K T A C360 4030011600 S CERAMIC C1608 JB 1C 104KT N C361 4030009810 S CERAMIC C10...

Page 18: ...009780 S CERAMIC C1005 CH 1E 270J T A C302 4030010080 S CERAMIC C1005 CH 1E 240J T A C303 4030011670 S CERAMIC C1005 CH 1E 2R5B T A C304 4030011670 S CERAMIC C1005 CH 1E 2R5B T A C305 4030009810 S CER...

Page 19: ...17 7030005240 S RESISTOR ERJ2GEJ 473 X 47 k R118 7030005120 S RESISTOR ERJ2GEJ 102 X 1 k R119 7030004980 S RESISTOR ERJ2GEJ 101 X 100 R120 7030005220 S RESISTOR ERJ2GEJ 223 X 22 k R121 7030005240 S RE...

Page 20: ...30009810 S CERAMIC C1005 JB 1E 102K T A C406 4030009810 S CERAMIC C1005 JB 1E 102K T A C407 4030009810 S CERAMIC C1005 JB 1E 102K T A C408 4030009760 S CERAMIC C1005 CH 1E 150J T A C409 4030009810 S C...

Page 21: ...RJ3GEYJ 104 V 100 k R219 7030003840 S RESISTOR ERJ3GEYJ 225 V 2 2 M R220 7030003560 S RESISTOR ERJ3GEYJ 103 V 10 k R221 7030005520 S RESISTOR RR0816R 334 D 330 k R222 7030005970 S RESISTOR RR0816R 683...

Page 22: ...1005 JB 1E 102K T A C208 4030009810 S CERAMIC C1005 JB 1E 102K T A C209 4030009810 S CERAMIC C1005 JB 1E 102K T A C210 4030009810 S CERAMIC C1005 JB 1E 102K T A C211 4030009810 S CERAMIC C1005 JB 1E 1...

Page 23: ...PARTS REF NO ODER NO DESCRIPTION QTY J901 6450000130 Connector HSJ1102 01 540 MIC 1 J902 6450001060 Connector HSJ1493 01 010 SP 1 J903 6450000870 Connector HEC2711 01 020 DC13 5V 1 S1 7600000190 Encod...

Page 24: ...MP1 C MP8 C MP9 C MP21 C MP13 C MP13 C MP13 C MP12 C MP29 C MP1 1F MP2 1F J902 1F S1 1F J903 1F MP301 D J901 1F MP19 C MP24 C MC1 L W1 L J1 C J1 C LOGIC UNIT MP11 L SP1 L MP12 L MP13 L MP15 C MP401 P...

Page 25: ...mbol R25 2SC4228 R45 Symbol R45 2SC4403 3 Symbol LY3 2SB1132 R Symbol BARB 2SB1201 S Symbol B1201 2SB1462 R Symbol BR 2SC3356 R25 Symbol R25 TRANSISTOR AND FET S S D G B E C B E C B1 E B2 C1 C2 E1 E2...

Page 26: ...SECTION 9 BOARD LAYOUTS 9 1 DS1 DS4 MC1 DS3 DS2 C91 C92 C93 S1 C81 C80 C83 C82 9 1 LOGIC UNIT TOP VIEW...

Page 27: ...C157 D19 C207 R207 Q4 C141 Q12 Q10 Q40 C208 R12 C19 C15 C169 C170 C180 Q45 C172 C178 R216 R240 R215 R213 R214 R242 R187 C179 C181 C154 R181 R186 C206 R241 R211 C171 D3 IC13 IC12 HD17 D13 D16 D7 D14 C1...

Page 28: ...Q305 R306 MOD S B5216A C414 C415 C922 FI101 800 300 AF MOD EXTMIC SPE INTSP AFON PLST PLCK PDA UL REMOTE DICK DIUD AM UR3 VR3 LVCO 3C HVCO TXC SHIFT VCC H L TXSEL DETO NOISE SD GND GND 30 1 TO LOGIC U...

Page 29: ...117 R116 R118 R119 R122 C121 C12 Q104 Q102 C124 C923 Q103 Q105 C106 D402 D401 C11 Q4 Q5 C123 C126 R5 C122 C413 C406 C406 C405 R408 R406 C402 C400 R612 R402 C416 C67 C65 R59 C63 C61 R101 R102 R110 R112...

Page 30: ...C380 R374 C376 C377 C379 C378 L355 Q356 L353 C554 C553 R210 D552 D201 D51 D351 D52 VRF GND GND 800M GND URF C101 Q253 C910 C102 S1 J904 J904 L900 1 C861 R362 R363 R863 R862 J903 C865 UOUT GND VOUT GN...

Page 31: ...C7 IC250 C371 C370 C904 C906 R365 C8 D1 C551 C15 C13 C14 C552 D551 C5 C4 C2 C3 C9 L2 L7 L8 L9 L724 L723 L551 L3 C10 C12 R728 R721 C724 C728 R726 R727 C911 C730 C727 R724 R262 R267 C214 R704 R708 R278...

Page 32: ...3 IC151 TA7368F 2F UNIT TO BATT VCC Q10 2SJ364 Q12 XP6501 CTCIN R3 5 IC13 NJM2904M IC12 BA4510F VCC R3 REG 3C 3C VCC MIC AMP MUTE SW IC12 BA4510F Q31 UN9211 D901 RB060L 40 HV REVERS VOLT PROTECT MC1 E...

Page 33: ...C201 0 001 C202 0 001 C216 0 001 C217 0 001 R216 1 M R211 470 k R215 82 k R214 82 k R213 82 k 1 5 6 7 8 IC13 NJM2904M R241 100 k C181 0 01 C180 0 1 C172 0 1 R219 2 2 M C173 0 0022 C169 0 0015 C170 0 1...

Page 34: ...R250 0 15 D250 MA8030H C235 0 001 C2360 001 C234 0 001 R251 68 k R252 47 k 1 2 3 4 6 5 7 8 IC250 NJM2904M R265 4 7 k R261 1 M R264 2 2 k C254 0 001 R267 15 k R263 10 k Q255 2SB1462 R C231 0 001 C232...

Page 35: ...1 MA2S077 C56 0 001 R51 68 k D52 MA304 Q51 2SC5226 4 C58 0 001 R52 100 k C59 0 001 R53 68 L53 LS 518 VRF C55 0 001 C54 10 P D55 1SV271 C69 9 P C57 12 P R57 33 k C60 0 001 R56 10 k R55 330 R54 100 Q52...

Page 36: ...Australia Phone 03 9387 0666 Fax 03 9387 0022 Unit 9 Sea St Herne Bay Kent CT6 8LD U K Phone 01227 741741 Fax 01227 741742 URL http www icomuk co uk Zac de la Plaine Rue Brindejonc des Moulinais BP 58...

Page 37: ...6 9 16 Kamihigashi Hirano ku Osaka 547 0002 Japan A 5551I S Printed in Japan 1998 by Icom Inc...

Search results

Summary of Contents for IC-T7H

Reviews:

Related manuals for IC-T7H

Brands by name

Popular brands

Icom IC-T7H, Service Manual

Search results

Summary of Contents for IC-T7H

Reviews:

Related manuals for IC-T7H

Brands by name

Popular brands