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M889-00

PCB Information

7.2.3

02/10/95

Ref

Var

IPN

Description

Ref

Var

IPN

Description

001-00011-60

(S) DIODE SR2607 6A/30V

001-10000-70

(S) DIODE SMD BAV70 DUAL SWITCH SOT-23 CO

001-10000-70

(S) DIODE SMD BAV70 DUAL SWITCH SOT-23 CO

D13

001-10000-70

(S) DIODE SMD BAV70 DUAL SWITCH SOT-23 CO

FTC

012-04100-05

CAP F/THRU 1N SUPPR FLTR STUD MTG
(fan circuit; mounted on heatsink)

IC1

002-10003-24

(S) IC SMD 324 QUAD OP AMP SO14

IC2

002-00014-62

(S) IC 317L 100MA REG 3 TERMINAL TO-92

IC3

002-10003-24

(S) IC SMD 324 QUAD OP AMP SO14

IC4

002-00014-62

(S) IC 317L 100MA REG 3 TERMINAL TO-92

IC5

002-10003-58

(S) IC SMD LM358 DUAL OP AMP

051-00626-00

COAX 1/4 WAVE XFMR 35E HELI LEFT HAND

065-10004-20

BEAD FE SMD CBD 4.6/3/3-4S2

051-00005-28

COIL TAIT NO 528 HAIRPIN 17MM T550A

052-08160-55

COIL A/W 5.5T/6.0MM HOR 0.8MM WIRE

065-10004-20

BEAD FE SMD CBD 4.6/3/3-4S2

065-10004-20

BEAD FE SMD CBD 4.6/3/3-4S2

051-00005-60

IND HAIRPIN 10MM TALL T859

L10

052-08160-55

COIL A/W 5.5T/6.0MM HOR 0.8MM WIRE

L12

051-00623-00

COAX 1/4 WAVE XFMR 25E HAIR PIN

L13

051-00619-00

COUPLER WIRELINE 800MHZ (53MM JACKET ST

L14

051-00619-00

COUPLER WIRELINE 800MHZ (53MM JACKET ST

L15

051-00619-00

COUPLER WIRELINE 800MHZ (53MM JACKET ST

L16

051-00629-00

COAX 1/4 WAVE XFMR 35E HOCKEY STICK RIGH

L18

065-10004-20

BEAD FE SMD CBD 4.6/3/3-4S2

L19

051-00005-60

IND HAIRPIN 10MM TALL T859

L20

052-08160-55

COIL A/W 5.5T/6.0MM HOR 0.8MM WIRE

L22

051-00624-00

COAX 1/4 WAVE XFMR 25E HOCKEY STICK LEFT

L26

051-00627-00

COAX 1/4 WAVE XFMR 35E HELI RIGHT HAND

L28

065-10004-20

BEAD FE SMD CBD 4.6/3/3-4S2

L29

051-00005-60

IND HAIRPIN 10MM TALL T859

L30

052-08160-55

COIL A/W 5.5T/6.0MM HOR 0.8MM WIRE

L32

051-00621-00

COAX 1/4 WAVE XFMR 25E HELI LEFT HAND

L33

051-00626-00

COAX 1/4 WAVE XFMR 35E HELI LEFT HAND

L35

065-10004-20

BEAD FE SMD CBD 4.6/3/3-4S2

L36

051-00005-60

IND HAIRPIN 10MM TALL T859

L37

052-08160-55

COIL A/W 5.5T/6.0MM HOR 0.8MM WIRE

L39

051-00622-00

COAX 1/4 WAVE XFMR 25E HELI RIGHT HAND

L40

051-00619-00

COUPLER WIRELINE 800MHZ (53MM JACKET ST

L41

051-00619-00

COUPLER WIRELINE 800MHZ (53MM JACKET ST

L42

051-00619-00

COUPLER WIRELINE 800MHZ (53MM JACKET ST

L43

051-00628-00

COAX 1/4 WAVE XFMR 35E HOCKEY STICK LEFT

L45

065-10004-20

BEAD FE SMD CBD 4.6/3/3-4S2

L46

051-00005-60

IND HAIRPIN 10MM TALL T859

L47

052-08160-55

COIL A/W 5.5T/6.0MM HOR 0.8MM WIRE

L49

051-00625-00

COAX 1/4 WAVE XFMR 25E HOCKEY STICK RIGH

L50

056-00021-04

IND FXD 330NH AXIAL

L51

056-00021-04

IND FXD 330NH AXIAL

L52

056-00021-04

IND FXD 330NH AXIAL

L53

052-08323-20

COIL A/W 2T/2.3MM SMD 0.8MM WIRE

L54

052-08325-20

COIL A/W 2T/2.5MM SMD 0.8MM WIRE

L55

052-08325-20

COIL A/W 2T/2.5MM SMD 0.8MM WIRE

L56

052-08323-20

COIL A/W 2T/2.3MM SMD 0.8MM WIRE

L60

065-10004-20

BEAD FE SMD CBD 4.6/3/3-4S2

L61

065-10004-20

BEAD FE SMD CBD 4.6/3/3-4S2

L63

052-56130-85

COIL A/W 8.5T/3.0MM HOR 0.56MM WIRE

L64

051-00630-00

LINK 15MM 1.4MM2 COPPER STAPLE

L65

051-00630-00

LINK 15MM 1.4MM2 COPPER STAPLE

L66

051-00630-00

LINK 15MM 1.4MM2 COPPER STAPLE

LED

008-00013-32

(S) LED 3MM RED LO CURRENT NO MTG (x2)

(front panel)

008-00013-35

(S) LED 3MM GREEN LO CURRENT NO MTG

LINK1

036-10000-00

RES M/F 0805 CHIP ZERO OHM

LINK2

036-10000-00

RES M/F 0805 CHIP ZERO OHM

240-02100-44

SKT COAX MINI JACK PCB MTG ANGLED

000-00293-30

(S) XSTR 2SC2933 NPN EPITAXIAL PLANAR 900M

000-00141-40

(LS) XSTR SD1414 6LFL UHF 45W

000-00141-40

(LS) XSTR SD1414 6LFL UHF 45W

000-00141-40

(LS) XSTR SD1414 6LFL UHF 45W

000-00141-40

(LS) XSTR SD1414 6LFL UHF 45W

000-00141-40

(LS) XSTR SD1414 6LFL UHF 45W

Q10

000-10017-00

(LS) XSTR SMD MMBF170LT1 FET SOT23

Q11

000-10008-17

(S) XSTR SMD BC817-25 NPN SOT-23 AF LO PW

Q12

000-10017-00

(LS) XSTR SMD MMBF170LT1 FET SOT23

Q13

000-10008-17

(S) XSTR SMD BC817-25 NPN SOT-23 AF LO PW

Q15

000-10008-17

(S) XSTR SMD BC817-25 NPN SOT-23 AF LO PW

Q16

000-00030-95

(S) XSTR 2N6107 PNP TO-220 AF PWR

Q17

000-10008-57

(S) XSTR SMD BCW70/BC857-215 PNP SOT23 AF

Q18

000-00011-70

(S) XSTR BD136 PNP AF PWR TO126

Q19

000-10008-57

(S) XSTR SMD BCW70/BC857-215 PNP SOT23 AF

Q20

000-10008-17

(S) XSTR SMD BC817-25 NPN SOT-23 AF LO PW

Q21

000-10008-17

(S) XSTR SMD BC817-25 NPN SOT-23 AF LO PW

Q22

000-10008-48

(S) XSTR SMD BCW60/BC848B215 NPN SOT23 AF

Q23

000-10008-48

(S) XSTR SMD BCW60/BC848B215 NPN SOT23 AF

Q24

000-10008-57

(S) XSTR SMD BCW70/BC857-215 PNP SOT23 AF

Q25

000-10008-48

(S) XSTR SMD BCW60/BC848B215 NPN SOT23 AF

}

see
note
below

Note:

Fit two new grounding clips (IPN 319-40009-00) when
replacing SD1414 transistors (see Section 3.4.2).

036-02100-03

L) RES 1218 PWR CHIP 10E 20% 1W

036-02100-03

L) RES 1218 PWR CHIP 10E 20% 1W

036-02100-02

RES 10E 1206 CHIP 200V 250MW RC01

036-02100-03

L) RES 1218 PWR CHIP 10E 20% 1W

036-02100-03

L) RES 1218 PWR CHIP 10E 20% 1W

036-02100-02

RES 10E 1206 CHIP 200V 250MW RC01

039-01650-00

RES DUMP LOAD 50E 16W TO-220

039-05025-00

RES DUMP LOAD 25E 50W TO-220

039-01650-00

RES DUMP LOAD 50E 16W TO-220

R10

036-02100-03

L) RES 1218 PWR CHIP 10E 20% 1W

R11

036-02100-03

L) RES 1218 PWR CHIP 10E 20% 1W

R12

036-02100-03

L) RES 1218 PWR CHIP 10E 20% 1W

R13

036-02100-03

L) RES 1218 PWR CHIP 10E 20% 1W

R14

036-02100-03

L) RES 1218 PWR CHIP 10E 20% 1W

R15

036-02100-03

L) RES 1218 PWR CHIP 10E 20% 1W

R16

039-05025-00

RES DUMP LOAD 25E 50W TO-220

R17

039-05025-00

RES DUMP LOAD 25E 50W TO-220

R17A

039-05025-00

RES DUMP LOAD 25E 50W TO-220

R18

039-05025-00

RES DUMP LOAD 25E 50W TO-220

R19

036-02100-03

L) RES 1218 PWR CHIP 10E 20% 1W

R20

036-02100-03

L) RES 1218 PWR CHIP 10E 20% 1W

R21

036-02100-02

RES 10E 1206 CHIP 200V 250MW RC01

R22

030-53100-20

RES FILM AI 100E 5% 0.4W 4X1.6MM

R23

030-53100-20

RES FILM AI 100E 5% 0.4W 4X1.6MM

R24

036-02100-02

RES 10E 1206 CHIP 200V 250MW RC01

R29

036-02100-02

RES 10E 1206 CHIP 200V 250MW RC01

R36

036-13680-00

RES M/F 0805 CHIP 680E 5%

R37

036-14100-00

RES M/F 0805 CHIP 1K 5%

R37A

036-14100-00

RES M/F 0805 CHIP 1K 5%

R38

036-17100-00

RES M/F 0805 CHIP 1M 5%

R42

036-15100-00

RES M/F 0805 CHIP 10K 5%

RV43

042-05470-09

RES PRESET 50K CERMET 9.5MM SQ FLAT

R44

036-14470-00

RES M/F 0805 CHIP 4K7 5%

R47

036-16100-00

RES M/F 0805 CHIP 100K 5%

RV48

042-04500-08

RES PRESET 5K CERMET 9.5MM SQ FLAT

R49

036-13680-00

RES M/F 0805 CHIP 680E 5%

R50

036-13680-00

RES M/F 0805 CHIP 680E 5%

RV52

042-04500-08

RES PRESET 5K CERMET 9.5MM SQ FLAT

R55

036-17100-00

RES M/F 0805 CHIP 1M 5%

R56

036-15100-00

RES M/F 0805 CHIP 10K 5%

RV57

042-05470-09

RES PRESET 50K CERMET 9.5MM SQ FLAT

R57

036-03820-03

L) RES 1218 PWR CHIP 820E 20% 1W

R57A

036-03820-03

L) RES 1218 PWR CHIP 820E 20% 1W

R58

036-14470-00

RES M/F 0805 CHIP 4K7 5%

R59

036-01560-03

L) RES 1218 PWR CHIP 5E6 20% 1W

R59A

036-01560-03

L) RES 1218 PWR CHIP 5E6 20% 1W

R60

036-03820-03

L) RES 1218 PWR CHIP 820E 20% 1W

R60A

036-03820-03

L) RES 1218 PWR CHIP 820E 20% 1W

R61

036-13220-00

RES M/F 0805 CHIP 220E 5%

R62

036-14100-00

RES M/F 0805 CHIP 1K 5%

#RV63

044-04200-03

RES PRESET MULTITURN 2K 10T PNL MTG

R64

036-14470-00

RES M/F 0805 CHIP 4K7 5%

R65

036-16100-00

RES M/F 0805 CHIP 100K 5%

R66

036-16100-00

RES M/F 0805 CHIP 100K 5%

R67

036-15100-00

RES M/F 0805 CHIP 10K 5%

R68

036-14470-00

RES M/F 0805 CHIP 4K7 5%

RV69

042-04220-02

RES PRESET 2K CERMET 9.5MM SQ FLAT TOP A

R69

036-12100-00

RES M/F 0805 CHIP 10E 5%

R70

036-13220-00

RES M/F 0805 CHIP 220E 5%

R72

045-04470-01

RES NTC 4K7 5% 5MM DISC

R73

036-16220-00

RES M/F 0805 CHIP 220K 5%

RV74

042-06500-08

RES PRESET 500K CERMET 9.5MM SQ FLAT

R75

036-15100-00

RES M/F 0805 CHIP 10K 5%

R76

036-14470-00

RES M/F 0805 CHIP 4K7 5%

R77

036-14220-00

RES M/F 0805 CHIP 2K2 5%

R78

036-14100-00

RES M/F 0805 CHIP 1K 5%

R79

036-16100-00

RES M/F 0805 CHIP 100K 5%

R80

036-13100-00

RES M/F 0805 CHIP 100E 5%

R81

036-14100-00

RES M/F 0805 CHIP 1K 5%

R82

036-14220-00

RES M/F 0805 CHIP 2K2 5%

R83

036-14100-00

RES M/F 0805 CHIP 1K 5%

R84

036-14220-00

RES M/F 0805 CHIP 2K2 5%

R85

036-14100-00

RES M/F 0805 CHIP 1K 5%

R86

036-14100-00

RES M/F 0805 CHIP 1K 5%

R87

036-15100-00

RES M/F 0805 CHIP 10K 5%

R88

036-15100-00

RES M/F 0805 CHIP 10K 5%

R89

036-13100-00

RES M/F 0805 CHIP 100E 5%

R90

036-03100-02

RES 100E 1206 CHIP 200V 250MW RC01

R91

036-03330-03

L) RES 1218 PWR CHIP 330E 20% 1W

R92

036-03330-03

L) RES 1218 PWR CHIP 330E 20% 1W

R95

036-14100-00

RES M/F 0805 CHIP 1K 5%

R96

036-14470-00

RES M/F 0805 CHIP 4K7 5%

R97

036-14100-00

RES M/F 0805 CHIP 1K 5%

R98

036-15100-00

RES M/F 0805 CHIP 10K 5%

R99

036-14390-00

RES M/F 0805 CHIP 3K9 5%

R100

036-14100-00

RES M/F 0805 CHIP 1K 5%

R101

036-12100-00

RES M/F 0805 CHIP 10E 5%

R102

036-16220-00

RES M/F 0805 CHIP 220K 5%

R103

036-15330-00

RES M/F 0805 CHIP 33K 5%

R104

036-15150-00

RES M/F 0805 CHIP 15K 5%

R105

036-16470-00

RES M/F 0805 CHIP 470K 5%

R106

036-15150-00

RES M/F 0805 CHIP 15K 5%

R107

036-14390-00

RES M/F 0805 CHIP 3K9 5%

R108

036-15100-00

RES M/F 0805 CHIP 10K 5%

R109

036-14330-00

RES M/F 0805 CHIP 3K3 5%

R110

036-16100-00

RES M/F 0805 CHIP 100K 5%

R111

036-16220-00

RES M/F 0805 CHIP 220K 5%

R112

036-16220-00

RES M/F 0805 CHIP 220K 5%

Содержание T889

Страница 1: ...M889 00 1 Copyright TEL 02 10 95 T889 Power Amplifier UHF FM 800 870MHz Issue 100 October 1995 M889 00 100 ...

Страница 2: ...rie 92 316 Sèvres Cedex France Phone 33 1 41 14 05 50 Fax 33 1 41 14 05 55 Germany Tait Mobilfunk GmbH Willstätterstraße 50 D 90449 Nürnberg 60 Germany Phone 49 911 96 746 0 Fax 49 911 96 746 79 New Zealand Tait Communications Ltd Unit 4 75 Blenheim Road P O Box 1185 Christchurch Phone 64 3 348 3301 Fax 64 3 343 0558 Singapore Tait Electronics Far East Pte Ltd 4 Leng Kee Road SIS Building 05 11A S...

Страница 3: ...d in an updata ble ring binder format and do not apply to this manual PCB Information PCB information is provided for all current issue PCBs as well as all previous issue PCBs manufactured in production quanti ties and is grouped according to PCB Thus you will find the parts list grid reference index if necessary PCB layouts and circuit diagram s for each individual PCB grouped together Errors If ...

Страница 4: ...ed stored or reduced to any electronic medium or machine readable form without prior written permission from Tait Electronics Ltd Ordering Tait Service Manuals Service Manuals should be ordered from your nearest Tait Branch or approved Dealer When ordering quote the Tait Internal Part Number IPN and where applicable the version Date Of Issue IPN M889 00 100 T889 Power Amplifier Service Manual Issu...

Страница 5: ...vided into seven Sections as listed below There is a detailed table of contents at the start of each Section Section Title 1 General Information 2 Circuit Operation 3 Introduction To Servicing 4 Initial Tuning Adjustment 5 Fault Finding 6 Installation 7 PCB Information ...

Страница 6: ...95 3 5 02 10 95 3 6 02 10 95 3 7 02 10 95 3 8 02 10 95 3 9 02 10 95 3 10 02 10 95 4 1 02 10 95 4 2 blank 4 3 02 10 95 4 4 02 10 95 5 1 02 10 95 5 2 blank 5 3 02 10 95 5 4 02 10 95 5 5 blank fold out 5 6 02 10 95 fold out 5 7 02 10 95 5 8 02 10 95 5 9 02 10 95 5 10 blank 6 1 02 10 95 6 2 blank 6 3 02 10 95 6 4 02 10 95 6 5 02 10 95 6 6 blank 7 1 1 02 10 95 7 1 2 blank 7 1 3 02 10 95 7 1 4 02 10 95 ...

Страница 7: ...tion provides a brief description of the T889 PA along with detailed specifica tions and a list of variants available The following topics are covered in this section Section Title Page 1 1 Introduction 1 3 1 2 1 2 1 1 2 2 Specifications Introduction General 1 4 1 4 1 4 1 3 Versions 1 6 ...

Страница 8: ...1 2 General Information M889 00 02 10 95 Copyright TEL ...

Страница 9: ...mitter can still produce half its rated power VSWR and thermal protection is incorporated into the basic design while monitoring and alarm signals are available for both forward and reverse power The output power is adjustable from the front panel The main PCB is mounted directly on a die cast chassis heatsink For long term relia bility four high quality low loss Teflon PCBs are sweated to the mai...

Страница 10: ... test methods and the conditions which apply for Type Approval testing in all countries can be obtained from Tait Electronics Ltd 1 2 2 General Power Output Rated Power 90W Range Of Adjustment 20 to 100W typical Duty Cycle Rating 90W continuous to 60 C Intermodulation 70dBc or 40dBi1 with 25dB isolation PA with output isolator interfering signal of 30dBc Mismatch Capability Ruggedness infinite VSW...

Страница 11: ...10 95 Spurious Emissions Conducted Transmit 36dBm to 1GHz 30dBm to 4GHz Standby 57dBm to 1GHz 47dBm to 4GHz Radiated Transmit 36dBm to 1GHz 30dBm to 4GHz Standby 57dBm to 1GHz 47dBm to 4GHz Dimensions Height 191mm Width 120mm Length 340mm Weight 3 5kg ...

Страница 12: ...1 6 General Information M889 00 02 10 95 Copyright TEL 1 3 Versions Description Version 10 800 870MHz ...

Страница 13: ...ion Title Page 2 1 Introduction 2 3 2 2 RF Circuitry 2 3 2 3 2 3 1 2 3 2 2 3 3 2 3 4 2 3 5 2 3 6 Control Circuitry Power Control Driver Power Level Thermal Protection Forward And Reverse Power Alarms Forward And Reverse Power Metering Fan Control Circuitry 2 4 2 5 2 5 2 5 2 5 2 6 2 6 Figure Title Page 2 1 2 2 2 3 High Level Block Diagram Control Circuitry Block Diagram Fan Control Logic Diagram 2 ...

Страница 14: ...2 2 Circuit Operation M889 00 02 10 95 Copyright TEL ...

Страница 15: ...hich delivers a minimum of 40W This signal is split via three 3dB couplers L13 L14 L15 and used to drive the four final amplifiers Q3 Q4 Q5 Q6 These outputs are recom bined by L40 L41 L42 and passed to the antenna socket via the directional coupler and low pass filter The directional coupler senses forward and reflected power which is rectified D1 D2 and passed to the control circuitry for meterin...

Страница 16: ...2 4 Circuit Operation M889 00 02 10 95 Copyright TEL 2 3 Control Circuitry Figure 2 2 Control Circuitry Block Diagram REF ...

Страница 17: ...adjust will be 20 to 50W 2 3 3 Thermal Protection At excessively high temperatures the output power will automatically reduce to a pre set level set by RV74 thus preventing the PA from overheating A thermistor controlled voltage divider R68 R72 applies a voltage to a comparator with hysteresis IC1 pins 12 13 14 The output current from the comparator is summed into the power control network via RV7...

Страница 18: ...eater than 10 C A logic AND function is applied to the comparator outputs by Q20 and Q21 thereby turning on the fan unconditionally via Q17 and Q18 if the heatsink temperature exceeds 70 C A logic OR function is applied to comparator IC3 pins 8 9 10 and Tx KEY signals thereby turning on the fan when the transmitter is keyed and the temperature is between 10 C and 70 C If the temperature drops belo...

Страница 19: ... Head Screws UNC Thread Screws Screw Torques Disassembly Reassembly 3 5 3 5 3 5 3 5 3 5 3 3 3 3 1 3 3 1 1 3 3 1 2 3 3 2 Component Replacement Leaded Components Desoldering Iron Method Component Cutting Method Surface Mount Devices 3 6 3 6 3 6 3 6 3 7 3 4 3 4 1 3 4 1 1 3 4 1 2 3 4 2 To Replace PA Transistors Capacitor Transistor Spacing Q1 2SC2933 Pre Driver Q2 Q3 Q4 Q5 Q6 SD1414 Replacement Proced...

Страница 20: ...3 2 Introduction To Servicing M889 00 02 10 95 Copyright TEL ...

Страница 21: ...andling proce dures refer to the manufacturers data books e g Philips data books covering CMOS devices or Motorola CMOS data books Section 5 Handling etc Figure 3 1 Typical Anti static Bench Set up An anti static bench kit refer to Figure 3 1 is available from Tait Electronics Ltd under the usual consumable goods ordering system The kit is held in stock under IPN 937 00000 34 and contains 1 conduc...

Страница 22: ...n current use all contain some beryllium oxide This sub stance while perfectly harmless in its normal solid form can become a severe health hazard when it has been reduced to dust For this reason the RF power transistors should not be broken open mutilated filed machined or physically damaged in any way that can produce dust particles ...

Страница 23: ...ll black finish Pozidriv screws used in the T889 are 4 40 UNC thread and cannot be interchanged with M3 screws Note that different lengths are used in different applica tions 3 2 3 Screw Torques It is important to tighten the cover and power transistor securing screws to the correct torque to ensure that the T889 maintains its specified performance We recommend the following torque settings cover ...

Страница 24: ...3 or 4 circles have been com pleted Remove the tip while continuing suction to ensure that all solder is removed from the joint then stop the suction Before pulling the lead out ensure it is not stuck to the plating If the lead is still not free resolder the joint and try again Note The desoldering iron does not usually have enough heat to desolder leads from the ground plane Additional heat may b...

Страница 25: ...handling removal and replacement techniques This equipment should be serv iced only by an approved Tait Dealer or Service Centre equipped with the necessary facilities Repairs attempted with incorrect equipment or by untrained personnel may result in permanent damage If in doubt contact Tait Electronics Ltd or your nearest Tait Branch or Subsidiary ...

Страница 26: ...ced in exactly the same position Note Be sure to measure between the transistor body and the tabs not the body of the capacitors Position the capacitors labelled b hard up against the transistor body 3 4 1 2 Q2 Q3 Q4 Q5 Q6 SD1414 Position all capacitors labelled b hard up against the transistor body 3 4 2 Replacement Procedure Desolder the tabs and grounding clips if an SD1414 by heating with a so...

Страница 27: ...M889 00 Introduction To Servicing 3 9 Copyright TEL 02 10 95 Figure 3 2 Typical Transistor Capacitor Spacing Q1 Q2 Shown Grounding Clips b b b b b c c b measurement a Q1 Q2 ...

Страница 28: ...the heatsink casting and desoldering it from the PCB Disconnect the input 50 ohm coaxial cable by unplugging it at the PCB Disconnect the battery positive and negative feed wires from the PCB Disconnect the alarm and metering wires from the PCB Lift the PCB gently from the heatsink to gain access to the underside of the PCB Caution Do not operate the PA with the PCB detached as the heatsink is use...

Страница 29: ...arm adjust ment and power meter calibration The following topics are covered in this section Section Title Page 4 1 Initial Connections 4 3 4 2 RF Alignment 4 3 4 3 High Temperature Shutdown Power Level 4 3 4 4 Low Forward Power Alarm 4 3 4 5 High Reverse Power Alarm 4 4 4 6 Remote Forward Power Meter Calibration 4 4 4 7 Remote Reverse Power Meter Calibration 4 4 ...

Страница 30: ...4 2 Initial Tuning Adjustment M889 00 02 10 95 Copyright TEL ...

Страница 31: ...n the drive source the power output should exceed 100W Adjust RV69 driver power level until the output power drops to 100W Adjust RV63 to reduce the power output to the required level e g 90W 4 3 High Temperature Shutdown Power Level Set RV63 power control to the required output power Earth pin 12 of IC1 the pad at NTC R72 is convenient Adjust RV74 shutdown power level for an output power of 20W R...

Страница 32: ...ing an unterminated 150W 3dB pad to the PA output This will result in a return loss of 6dB Note Remote indication is available at D range pin 4 4 6 Remote Forward Power Meter Calibration If a remote meter is connected adjust RV43 forward power meter for the remote reading to agree with the RF power meter reading 4 7 Remote Reverse Power Meter Calibration If a remote meter is connected connect a 50...

Страница 33: ...r contact your nearest authorised Tait Dealer or Service Centre Further assistance may be obtained from the Customer Support Group Radio Infrastructure Division Tait Elec tronics Ltd Christchurch New Zealand The following topics are covered in this section Section Title Page 5 1 Visual Checks 5 3 5 2 Component Checks 5 3 5 3 DC Checks 5 3 5 4 RF Checks 5 4 5 5 5 5 1 5 5 2 5 5 3 Fault Finding Chart...

Страница 34: ...5 2 Fault Finding M889 00 02 10 95 Copyright TEL ...

Страница 35: ...ium or low resistance ranges The collector current drawn by multi junction transistors is a further guide to their per formance If an IC is suspect the most reliable check is to measure the DC operating voltages Due to the catastrophic nature of most IC failures the pin voltages will usually be markedly different from the recommended values in the presence of a fault The recommended values can be ...

Страница 36: ... transistors Q1 Q6 Note 1 Always test individual PA stages at the 50Ω test points located at the ends of the semi rigid transmission lines furthest away from the RF transistors Note 2 Always test Q1 and Q2 as a pair Note 3 Use 50Ω semi rigid coax for the flying test leads For problems with the power control circuitry refer to the Power Control Fault Finding Chart Section 5 5 2 Transistor Input Tra...

Страница 37: ...M889 00 Fault Finding 5 5 Copyright TEL 02 10 95 replace A4 pages 5 5 5 6 with A3 pages 5 5 5 6 file name 88900_5a 100 ...

Страница 38: ...5 6 Fault Finding M889 00 02 10 95 Copyright TEL replace A4 pages 5 5 5 6 with A3 pages 5 5 5 6 file name 88900_5a 100 ...

Страница 39: ...rid Check components in LPF Check output N type connector for short or wear Replace parts as necessary N N N Y Y Y Y N N Y Y N Y N N Y Y Is Q2 output 40W see Figure 5 1 A B N Check the condition of splitter hybrids L13 L14 L15 Are there any shorts between the splitter wires or broken wires Q3 Q4 Q5 Q6 outputs each 30W test each individually as per Figure 5 1 C D Check the condition of combiner hyb...

Страница 40: ...e adjusting RV74 until PA output power is set to 35W Does high reverse power alarm LED light when PA operated into a mismatch of 3 1 or worse To test connect an unterminated 3dB pad to the PA output thereby setting up a 3 1 mismatch High Reverse Power Alarm Check Does the output power reduce to 35W at high operating temperatures To test heat R72 with the tip of a soldering iron Over Temperature Sh...

Страница 41: ...stop the fan Spray freeze on R116 OR short R113 Check IC3 pin 14 11V Check Q21 Q20 N N Y Y Check Q20 Q21 collector voltages Check Q17 Q18 Check IC3 pin 14 1V Check Q19 Check Tx key is low at ground Do not key transmitter Does high temperature control circuit activate fan Heat R72 with tip of soldering iron Check IC3 pin 8 11V Check Q21 Q20 Fan control OK Heat R72 to 70 C with tip of soldering iron...

Страница 42: ...5 10 Fault Finding M889 00 02 10 95 Copyright TEL ...

Страница 43: ...M889 00 Fault Finding 5 5 Copyright TEL 02 10 95 ...

Страница 44: ... its pad 2 Solder the test lead outer core to the earth plane remove the resist first 3 Solder the inner cores of L1 and the test lead together off the PCB main PCB L1 input test lead 50Ω test point Output Test Lead Q3 Q6 Q4 Shown Refer to drawing B above 1 Desolder the appropriate DC blocking capacitor and resolder on edge 2 Remove the wireline clamping plate and solder the test lead outer core t...

Страница 45: ...tion of the basic rack mounting and wiring procedures The following topics are covered in this section Section Title Page 6 1 Rack Mounting 6 3 6 2 Rack Wiring 6 5 6 3 Power Supply 6 5 Figure Title Page 6 1 Guide Rails 6 3 6 2 Chassis Connectors 6 3 6 3 Latched Position 6 4 6 4 D Range Wiring Rear View 6 5 ...

Страница 46: ...6 2 Installation M889 00 02 10 95 Copyright TEL ...

Страница 47: ... guide rail is located with just one screw The PA is secured into the guide with two front panel mounting screws The RF input via the rear panel BNC connector should be connected to an adjacent T881 transmitter The RF output is via the rear N type connector whilst all DC audio and control connections are via the D range connector The guide rails will allow the PA to be latched in the extended posi...

Страница 48: ...6 4 Installation M889 00 02 10 95 Copyright TEL Figure 6 3 Latched Position Stop RF Output Top Rail RF Input D Range Bottom Rail ...

Страница 49: ...f access to the rear of the rack frame is restricted the cables should be long enough to permit full withdrawal of the chassis from the guide Figure 6 4 D Range Wiring Rear View 6 3 Power Supply If a power supply other than an appropriate Tait model is used ensure that it is capable of providing enough current to drive the T800 system and is also free from excessive ripple or noise Reverse Power M...

Страница 50: ...6 6 Installation M889 00 02 10 95 Copyright TEL ...

Страница 51: ... 7 PCB Information This section provides parts lists a grid reference index PCB layouts and circuit diagrams for the T889 PA This section contains the following information Section Title IPN Page 7 1 Introduction 7 1 3 7 2 T889 PA PCB 220 01326 01 7 2 1 ...

Страница 52: ...7 1 2 PCB Information M889 00 02 10 95 Copyright TEL ...

Страница 53: ...nd description A number in the variant column indicates that this component is fitted only to that variant The miscellaneous and mechanical section lists the variant and common parts in IPN order Grid Reference Index To assist in locating components and labelled pads on the PCB layouts and circuit diagrams a com ponent grid reference index has been provided This index lists the components and pads...

Страница 54: ...o the sheet number printed on the bottom right hand corner of the CAD diagram and the last two characters refer to the location on that sheet of the continuation of the circuit e g 1 D4 If more than one line is represented indicated by a double thickness line a dot with a reference label will follow the route each individual line represents ...

Страница 55: ...tion contains the following information IPN Section Page 220 01326 01 Parts List Mechanical Miscellaneous Parts Grid Reference Index PCB Layout Bottom Side PCB Layout Top Side RF Section Circuit Diagram Control Section Circuit Diagram 7 2 2 7 2 5 7 2 7 7 2 9 7 2 10 7 2 11 7 2 12 ...

Страница 56: ...ER 0805 CHIP 4N7 10 X7R 50V C53 029 01270 02 CAP MICA 5MM CASE 2P7 0 25P C54 029 01560 01 CAP MICA 10MM CASE 5P6 0 25P C55 029 01680 01 CAP MICA 10MM CASE 6P8 5 C56 029 01560 01 CAP MICA 10MM CASE 5P6 0 25P C57 029 01270 02 CAP MICA 5MM CASE 2P7 0 25P C58 015 06100 08 CAP CER 1206 CHIP 100N 10 X7R 50V C59 014 07470 03 L CAP TANT CHIP 4U7 25V 20 6X3 2X2 5M C60 015 24470 08 CAP CER 0805 CHIP 4N7 10 ...

Страница 57: ...10008 48 S XSTR SMD BCW60 BC848B215 NPN SOT23 AF see note below Note Fit two new grounding clips IPN 319 40009 00 when replacing SD1414 transistors see Section 3 4 2 R1 036 02100 03 L RES 1218 PWR CHIP 10E 20 1W R2 036 02100 03 L RES 1218 PWR CHIP 10E 20 1W R3 036 02100 02 RES 10E 1206 CHIP 200V 250MW RC01 R4 036 02100 03 L RES 1218 PWR CHIP 10E 20 1W R5 036 02100 03 L RES 1218 PWR CHIP 10E 20 1W ...

Страница 58: ... 5 R120 036 14680 00 RES M F 0805 CHIP 6K8 5 R121 036 14100 00 RES M F 0805 CHIP 1K 5 R122 036 14100 00 RES M F 0805 CHIP 1K 5 R123 036 13470 00 RES M F 0805 CHIP 470E 5 R124 036 13220 00 RES M F 0805 CHIP 220E 5 R125 036 16100 00 RES M F 0805 CHIP 100K 5 R126 036 16150 00 RES M F 0805 CHIP 150K 5 R127 036 15100 00 RES M F 0805 CHIP 10K 5 R128 036 16100 00 RES M F 0805 CHIP 100K 5 R129 036 15220 0...

Страница 59: ...11182 01 HEATSINK T889 COMPLETE D CAST MECH DRILLED 303 23117 00 COVER COMPL A2M2223 2 A2M2223 1 SIDE 303 50005 00 CONTACT A4M2311 SPRING EARTH T858 306 01010 00 FERRULE A4M948 HANDLE FXD EQUIP 308 01007 00 HANDLE A4M949 FXD EQUIP 316 06515 00 PNL FRT T889 SCRND COMPLETE 318 01011 00 RAIL A2M1872 BOTTOM T377 PA 318 01012 00 RAIL A3M1873 TOP T377 PA 319 01152 00 SHIELD A3M2250 F THRU MTG T857 ASSEM...

Страница 60: ...7 2 6 PCB Information M889 00 02 10 95 Copyright TEL ...

Страница 61: ... P0 C95 1 T7 2 P0 C96 1 V5 2 K0 C97 1 M9 1 U9 C98 1 N9 1 V9 C99 1 V6 2 L0 C102 1 U8 2 Q2 C103 1 T8 2 Q2 C104 1 U7 2 Q3 C105 1 T8 2 R3 C106 1 T8 2 R2 C107 1 U9 2 Q1 C108 1 U3 2 J8 C109 1 U4 2 H4 C114 1 V10 2 A8 C115 1 V9 2 A4 C116 1 U5 2 R7 C117 1 W7 2 P9 C118 1 W7 2 P8 C119 1 W8 2 P7 C120 1 W8 2 P6 C121 1 V3 2 P5 C122 1 V3 2 P4 C123 1 U5 2 Q7 C124 1 U5 2 Q7 C125 1 U5 2 R8 C126 1 U3 2 N6 C127 1 U3 ...

Страница 62: ...0A 1 R4 1 B3 R61 1 V8 2 C0 R62 1 V8 2 C0 RV63 1 U6 2 M3 RV63A 1 V7 2 M2 R64 1 U8 2 N3 R65 1 U7 2 P1 R66 1 U9 2 P2 R67 1 V6 2 K1 R68 1 V6 2 K2 RV69 1 V2 2 E0 R69 1 U6 2 F0 R70 1 U7 2 F0 R72 1 M9 1 T9 R73 1 V5 2 L0 RV74 1 V2 2 M1 R75 1 V6 2 M0 R76 1 V6 2 M0 R77 1 U8 2 Q3 R78 1 U8 2 Q2 R79 1 U7 2 N1 R80 1 T8 2 R3 R81 1 U6 2 D7 R82 1 U6 2 D8 R83 1 V9 2 C4 R84 1 V6 2 C4 R85 1 S2 2 E3 R86 1 U4 2 G7 R87 ...

Страница 63: ...M889 00 PCB Information 7 2 9 Copyright TEL 02 10 95 T889 PCB Layout Bottom Side 220 01326 01 ...

Страница 64: ...7 2 10 PCB Information M889 00 02 10 95 Copyright TEL T889 PCB Layout Top Side 220 01326 01 L46 C97 C98 L19 L29 L96 C59 L22 L16 L32 L26 L1 L49 L43 L12 L39 L33 C45 C38 C15 C32 C25 ...

Страница 65: ...M889 00 PCB Information 7 2 11 Copyright TEL 02 10 95 T889 RF Section 220 01326 01 ...

Страница 66: ...7 2 12 PCB Information M889 00 02 10 95 Copyright TEL T889 Control Section 220 01326 01 ...

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