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SECTION 10

BLOCK DIAGRAM

10 - 1

D51: MA2S077
D52: MA2S077

PA BOARD

VT4
CTRL

Q705: 2SA1588

VT4

D703: MA2S111

Q202: 
2SA1588

T4
REG

+3C

VCC

BAND
SEL

TXSEL

Q203: UN9210

T4

Q304: 2SC5108
Q305: 2SC5108

DUAL VCO BOARD

Q702: 2SB1132
Q703: 2SD2216
D702: MA133

VHF
SHIFT
SW

Q354: UN9210

SHIFT

Q353:
UN9115

LVCO

+3C

Q357:
UN9115

LVCO
CTRL

Q853:
UN9115

VCO
CTRL

D354:
MA132WA

HVCO
CTRL

HVCO

Q854:
UN9210

UHF
SHIFT
SW

V VCO

U VCO

Q301: 2SC5006
Q302: 2SC5006

D302: MA2S077

D301: HVU350

Q306: 
2SC5108

Q351: 2SC5107

T4
CTRL

TXC

Q704:
UN9211

D353: MA2S077

Q852: 2SC4403

UT4
CTRL

D352: MA2S077

D351: MA2S077

Q701:
2SC3356

Q201:
2SC3356

BAND
SW

VCC1

VGG1

VGG2

D201: MA2S077

Q401: 2SK3074

Q402: 2SK3075

VOUT

UOUT

VCC2

D551: MA2S077

Q204: UN921L

 

D722: 1SV271

TX

RX

VERSION

VERSION

144~146
430~440

EUR

APC
SENS

Q201:
2SC4226

FI201: EFCH445MWN [USA-3]

EFCH435MWN [other]

R250: 0.15 1W

APC
SET

VCC

IC301: TC4W53FU
Q305: UN9210
Q306: UN9213
Q307: XP1114
Q308: XP1213
Q309: UN9114
Q310: UN9210

D301: MA2S111
D302: MA2S111

Q250: 2SC4081
Q253: DTC114TU
D250: MA8030

VCC

APC

Q255: 2SB1462
D251: MA8043

VCC

Q202: 2SC4403

IC250: NJM2904M

Q400:
2SC5107 

FI101: 
CFWM450E

PLL IC

IC851: 
UPD3140GS

X851: CR-515

Q352: 
2SC5107

REF

15.2MHz

TUNE
CTRL

Q355:
2SK880

Q356: 2SC4081

15.2MHz

Q4: XP1501
Q5: 2SA1588
D402: MA132WA

IF IC

45.6MHz

IC101:
TA31136FN

2NDLO

DC
SW

CHG

HV

FI401:
FL-244

Q101:
2SC4215

Q901: 2SB1132
D902: MA133
D904: SB07-03C

IF: 45.15 MHz

D903: MA2S728
Q902: HAT1024R

Q401:
2SC4403

D54: MA304

Q51: 2SC5226

D53: MA304

Q52: 2SC4403

ITA

SEA

136~174
400~470

140~150
430~440

USA-3

EUR

ITA

SEA

USA-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:
EM-123TH

S2: JPM1990-2013R

SP1:
CS028014-12

TX
SENS

+3CPU
REG

VCC

IC2: S-81335HG-KI

RESET

+3C
REG

VCC

+3C

Q4: XP1501
Q5: 2SB1132
Q40: UN9213
D3: MA2S111

D19: MA2S111

Q42: UN9211

IC3: S-80730SL-AT

LED
DRIVER

LED
DRIVER

VCC

VCC

5.039MHz

X1: CR-534

Q34: UN9215

Q36: UN9215
Q44: UN9215

Q1: UN9210
D1: MA2S111

LIGHT

NOISE

DS2: LNJ310M6URA

DS1: LNJ310M6URA

DS3:
LT1EPS3A

AF
REG

VCC

AFON

Q151: 2SB1201
Q152: XP1501

VOL

1F UNIT

TP96D96E20-15F10KA

SENS

INITIAL
MATRIX

KEY

CPU

EEPROM

IC1

M38267M8L-219GP [USA-3] only
M38267M8L-155GP [Other]

DS4: LD-BU4323J

CTCOUT

DTMF

Q32:
2SB1462

LOGIC UNIT

LCD

IC15: 
X25080SI-2.7

D303: MA304
D304: MA2S077

BUFF

LOOP
FIL

LOOP
FIL

BUFF

x3

LPF

MIC

PRO
TECT

D4:
MA8051

MIC
REG

Q30:
UN9115

-3C

LPF

LPF

CTC
REG

BPF

DRIVE
AMP

AF
MUTE

DET
SW

IF
AMP

XTAL
BPF

LO
AMP

BPF

RX LO
FREQUENCY

LO
AMP

LO
AMP

TX
SW

RX
SW

BUFF

BUFF

AF 
AMP

Q35: UN9215

BPF

BPF

BPF

RF
AMP

RF
AMP

RF
AMP

D52: MA304

APC
CTRL

DRIVE
AMP

PWR
AMP

LPF

HPF

D701: MA2S077

LPF

LPF

HPF

TX
SW

ANT
SW

ANT
SW

D724: 1SV308

D723: 1SV308

D552: MA2S077

LIMIT
TER

LIMIT
TER

CLONE
SW

VR3V
REG

UR3V
REG

Q404: UN9115
D400: MA2S077

D202: MA2S077

Q403: UN9115

D203: MA2S077

R3.5

VR3

VR3V

R3.5

UR3

UR3V

Q45:
UN9115

IC102: TC4S66F

COMMON

RX

DATA BUS

TX

144~148
430~450

144~146
430~440

136~174
400~470

118~174
430~440

118~174
400~470

FREQUENCY

RX LO
FREQUENCY

189.15~191.15
384.85~394.85

181.15~219.15
354.85~424.85

163.15~219.15
354.85~424.85

163.15~219.15
384.85~394.85

D202: MA2S077

VT4

D725: 1SV271

D201: 1SV271

D55: 1SV271

REMOTE

T4

D6: MA2S111
D7: MA2S111
D8: MA2S111

ANT

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...

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