Line Rectifier, Output Filters, Clamp, Output UV | Tektronix 1705A

J6

REAR

PANEL

J5

1

1

2

2

3

3

CAUTION: ALL CIRCUITRY TO THE

LEFT OF THE ISOLATION

4

4

BOUNDARY IS AT POWER LINE

ISOLATION

POTENTIAL AND REQUIRES

BOUNDARY

5

5

AN ISOLATION TRANSFORMER

TO SERVICE

6

6

7

7

8

8

9

9

LINE RECTIFIER

CR10

10

10

11

11

AND FILTER

C62

C63

NOT INSTALLED

NOT INSTALLED

OUTPUT FILTERS

MOUNTING

CLAMP

C56

1MH

R102

4.7UH

L4

L3

.022UF

8

CR11

+15V

C44

RV1

C30

C36

W4

R89

C54

1

T3

10

560UF

560UF

0 OHM

CR23

CR22

.47UF

NOT INSTALLED

330UF

+15A

F1

5

2A

90--- 250V

CR18

9

R93

NOT INSTALLED

150K

J10

R91

R92

2

8

C29

L2

C38

C57

100K

100K

4.7UH

CR12

560UF

560UF

.068UF

R94

--- 15V

150K

14

W3

0 OHM

--- 15A

CR24

CR21

DS4

CR14

R67

13

10.0

+40V

CR17

C32

C33

560UF

10UF

5

12

W2

0 OHM

OUTPUT UV

C49

C42

+40VA

.1UF

560UF

L1

+5VC

SHUTDOWN

PULSE

CR13

6

11

4.7UH

WIDTH

C47

7

+5V

.47UF

R97

CR19

MODULATOR

560UF

560UF

560UF

W1

2.00K

C35

C31

C37

0 OHM

SWITCHER

C55

+5D

MOSFET

SNUBBER

NOT INSTALLED

U5

+5VC

CR25

C50

CR27

5

UC3842

.47UF

+5V

7

1

COMP

REF

8

H

+5V

6

C53

U3B

2

VFB

VCC

7

R81

100PF

VR3

LM393

178

R14

R79

Q9

ISOLATION

3

6

5.1V

10.0

Q11

ISEN

OUT

49.9K

BOUNDARY

J4

4

5

C58

RT/CT

GND

R82

R90

1

<8>

J4--- 1

1

200PF

4.99K

2.4K

CR20

R13

A4

100

<8>

FOCUS

2

2

R87

D5

3

22.1

A4

<8>

ZAXIS

3

NC

4

4

C51

R101

R86

5

.01UF

+100V

5

R96

49.9

.51

U4B

49.9K

+40V

6

6

74HC221A

Q9

NC

6

CX

+15V

7

7

+5V

8

8

R88

C59

NC

7

ERROR

9

2.00K

RX

FEEDBACK

+40V

9

.1UF

9

5

NC

G D S

10

+5VC

AMPLIFIER

C

A

Q

TRANSFORMER

--- 15V

10

10 B L

Q

12

NC

R98

+5V

C52

1

DRIVER

10.00K

.01UF

1

+5VC

+5VC

C41

+5VC

C40

R69

+5V

CR15

R68

CR26

R71

10.00K

.47UF

T2

178

4700PF

221K

1

4

R85

R80

+5VC

U4A

100K

R95

2.00K

C48

C45

R99

4.53K

+5VC

C43

+5VC

200PF

74HC221A

.47UF

C61

CR29

C39

100K

.47UF

14

CX

VCC

16

470PF

2

3

.1UF

VR4

10V

VR1

+5V ADJUST

8

R74

GND

8

R78

4.99K

15

R77

R62

R70

RX

3.74K

3

100

100

10.00K

1

1

13

A

Q

Q8

2

C

U3A

+5VC

2

B

Q

4

NC

LM393

L

R75

C60

4

4.99K

.1UF

3

+5VC

Q7

J2

+5VC

R72

R73

1

+5VC

10.0

10.0

2

R76

C46

R83

3.74K

.01UF

CR16

10.00K

R84

PEAK

SECONDARY GROUND

18.7K

LINE SIDE COMMON

(CHASSIS GROUND)

DETECTOR

TP2

TP1

NOTE:

SEE PARTS LIST FOR EARLIER VALUES

PART OF A1 POWER SUPPLY

AND SERIAL NUMBER RANGES.

USED WITH 1700F10 UPGRADE ONLY

(DC OPER.)

J4

CONNECTS

TO J4

<4>

A3

MAIN

BOARD

FRONT

PANEL

POWER

(OPEN = ON)

S1

1

2

1705A SPECTRUM MONITOR

LOW VOLTS POWER SUPPLY <7>

Image 210

Tektronix 1705A Line Rectifier, Output Filters, Clamp, Output UV, Shutdown Pulse, Width, Modulator, Switcher, Error, Peak

Contents

1705A Spectrum Monitor SN B040000 and Above 070-8222-08 Table of Contents Installation Table of ContentsTheory of Operation Checks and Adjustments 1705A Spectrum Monitor Iii Maintenance Options Replaceable Electrical Parts Replaceable Electrical PartsReplaceable Mechanical Parts 10-1 List of Figures Simulation of a 1705A Full SPAN/DIV display Considerations for custom installation of an instrument 1705A Spectrum Monitor Vii List of Tables Viii General Safety Summary General Safety Summary Service Safety Summary Service Safety Summary Xii Installation PrefaceIntroduction Replaceable Mechanical Parts Contacting Tektronix PrefaceUSA Preface Xvi Introduction Page Typical Configurations Section Introduction Introduction AccessoriesOptions #73 Safety Information Optional Accessories Spectrum Display SPAN/DIVFull Power Source Introduction Spectrum DisplayCRT Display Certifications and Compliances Introduction Environmental CharacteristicsPhysical Characteristics EMC Introduction Certifications and Compliances CAT Meters Applications SUN Satellite Earth Using the 1705A for Satellite Communication LOS Angeles Band Input SignalsVancouver BC Seattle Portland Helena Boise SAN Francisco SAN Diego Zeroing in on a Satellite Tek 12.20 GHZ Horizontal Vertical Polarization Frequency and Number Down Link Transponder Looking at Exciters with the 70 MHz Input GHZ Miscellaneous Uses for the 1705A Splitter LNB OUTBand Input Operating Instructions Page Front-panel Controls and Indicators Section Operating Instructions Filter Input Position PowerOperating Instructions Display Variable control that adjusts the display brightness SPAN/DIV Rear- Panel Connectors Position Holder for the instrument’s mains fuse Spectrum Monitor Powering- up 1400 MHZ Measurement Graticule 1705A graticule scale Operating Instructions DB Reference Reading in dB Voltage Ratio Power RatioVoltage Ratio Power Ratio Reading in dB 75Ω 50Ω Operating Instructions DBm to v Conversion Reading in dBm Minimum Maximum Frequency MIDFrequency Scale = 10 Divisions Sweep Length = 12 Divisions Center Frequency Readout 70 MHZMHZ 1400 MHZ Point on Trace That Corresponds to Center Frequency Tuned AT this Point Customizing Frequency Readout Main Menu Readout ModeOffset Adjust Readout Position 12.00 GHZ Basic Operating Procedure Locating Ku- Band Satellites City Satcom K2 G-STAR 1705A Spectrum Monitor Operating Instructions Page Page Installation Page Section Installation Electrical Installation LNB Power Band Input OFF Mechanical InstallationInstallation Cabinet Options 105 250875 130 1700F02 portable cabinet dimensions Cabinetizing Cabinet Securing Screws A WFM7F05 with a blank front panel 1700F06 1700F07 1705A Spectrum Monitor Theory of Operation Page Block Diagram Section Theory of OperationOverview Theory of Operation Front Panel Diagram RF Input Diagram If Amplifier Diagram Resolution Filter and Log Detector Sweep Generator Diagram Start Display Deflection Amplifiers Diagram Vertical Deflection Amplifier Microprocessor Diagram Front Panel Diagram LOW Load Average High Load Low Voltage Power Supply Diagram Pulse Width Modulator Theory of Operation High Voltage Power Supply Diagram Axis Amplifier CRT The pinout for the CRT is shown in Figure Pinout of the CRT Socket 1705A Spectrum Monitor Theory of Operation Checks and Adjustments Page Section Checks And Adjustments Recommended Equipment ListElectrical Instruments Auxiliary Equipment Short-Form Procedure Checks and Adjustments SMA Male-to-bnc Female AdapterPerformance Check 1705A Spectrum Monitor Long Form Procedure Checks and Adjustments Preliminary Control Settings Page Marker Here Marker is +/-- 1 Minor Division from Here Checks and Adjustments 1705A Spectrum Monitor Page Variable Autotransformer L-BAND Input Disregard Marker Here Graticule Line UHF Sine Wave Generator Page End of the Performance Check Procedure Adjustment Procedure Short- Form Procedure Preliminary Setup Video SPAN/DIV Full Center Frequency A3 Main BD FrontA1 PWR Sply BD Tek Remove the shorting strap 1705A Spectrum Monitor ShortingStrap 1705A Spectrum Monitor Page 1705A Spectrum Monitor Page 1705A Spectrum Monitor End of Adjustment Procedure Checks and Adjustments Maintenance Page Section Maintenance Cleaning Cmos Schottky SignalLOW Power Schott ECL Troubleshooting Diagnostic Routines Nonvolatile 2444 RAM Test Reading Data Stored AT 60H to 7F in Processor Error Cannot Read or Write Press Input KEY to Exit Troubleshooting Aids Circuit board assembly locations Major Assembly Interconnection ROW B ROW a PIN Power Supply Troubleshooting Procedure Power Supply Fault Symptoms Maintenance Power Supply Fault Symptoms Low Volts Supply Maintenance Rectifier/Switcher Check High Volts Supply Axis Amplifier Check Maintenance High Volts Supply Fault SymptomsFocus Amplifier Check Grid Drive Check High Voltage Oscillator Check CRT Voltage Check Corrective Maintenance Obtaining Replacement Parts Mechanical Disassembly/Assembly Maintenance Test Selectable ComponentsBezel Removal Graticule Light Removal and Replacement Removal of the CRT Replacing the CRT Removal of Front- Panel Assembly Removal of the Rear Panel Removing the L- Band Tuner Removal Replacement of the Main Board Removal Replacement of the Power Supply Board Removing the LNB Power Supply Board Front Repackaging 1705A Spectrum Monitor Options Page Power Cord Options Description of power cord Field Upgrade KitsPower Cord Options Section Options Ordering Replaceable Electrical Parts Page Using the Replaceable Electrical Parts List Section Replaceable Electrical PartsParts Ordering Information Column Column DescriptionsTektronix Part No Column 3 AMP INC Fulling Mill Harrisburg PA Spectrum Control INC Weight STCross Index MFR. Code Number to Manufacturer MSD INC Orange ST DARLINGTON, SC Chrome Shibaura Tokyo Japan 2ND Floor NEW Kyoei MINATO-KU Zman & AssociatesSobudai Zawa Kanagawa 228 Japan Wilhelm Westerman Circuit BD Assyfront Panel Circuit BD Assypower SUPPLY, 1705ACircuit BD ASSY18V Power Supply Circuit BD Assymain Board ASSY,1705A IN,BULK IAL,MICAP,FXD,PLSTC100PF,5%,1600VDC/500VAC CAP,FXD,CER DI470PF,20%,100V TUBULAR,MI A1DS2 LAMP,GLOW135V MAX,1.9MA,C2A-T,WIRE LeadA1DS1 A1DS3 RES,FXD,CMPSN1.5M OHM,5%,1W SQ,TOP AdjustbulkSQ,SIDE ADJUSTT&R RES,FXD,CMPSN2.2M OHM,5%,0.5W REELED,SMALL Body RES,FXD,FILM5K OHM,0.1%,0.2W,TC=T9IAL,T&R,SMALL Body RES,FXDMETAL FILM,100K OHM,1%,0.2W,TC=100 RES,THERMAL5 OHM,10%,7A/DEG C SQ,TOP ADJUST,T&RWIRED,1705A RES,FXD,CMPSN2.4K OHM,5%,2W CA ASSY,SP,ELEC34,26 AWG,5.0 L LED ASSYDIR1Part of A2DS313 RES,VAR,PNLCP,20K OHM,20%,0.5W,LINEAR,W SHIELD,ELECCIRCUIT Board BUS,CNDCTPLATE,ELEC Shldcircuit Board SHIELD,ELEC1705A,BRS CAP,VAR,CER DI9-45PF,200V CAP,FXD,ELCTLT33UF,+50-20%,35WVDCUVX1H330MAA CAP,VAR,PLSTC1-3.5PF,500V A3CR2 CAP,FXD,MICA DI98PF,5%,500VA3CR1 DIO,SIGFAST RCVRY70V,200MA,100NS,COM A3FL2 A3FL1FLTR,BANDPASS A3FL3 COIL,RFFIXED,64UH COIL,RFFIXED,45NHCOIL,RFFIXED,15NH COIL,RFFIXED,505NH ADJUSTT&R GF06UT 2KRES NTWK,FXD,FI10K OHM,20%,9RES GF06UT 5K RES,FXD,FILM115K OHM,1%,0.2W,TC=T0 RES,FXD,FILM237K OHM,1%,0.2W,TC=T0RES,FXD,FILM3.4K OHM,1%,0.2W,TC=T0 RES,FXD,FILM7.5K OHM,1%,0.2W,TC=T0 RES,VAR,NONWWTRMR,250 OHM,20%,0.5W LIN CRB20FXE1K62 RES,FXD,FILM1M OHM.1%,0.2W,TC=T0Percent CRB20FXE9K35 RES,FXD,WW6.3K OHM,1%,3W RES,FXD,FILM2.1K OHM,1%,0.2W,TC=T0RES,VAR,NONWWTRMR,100 OHM,20%,0.5W LIN CRB20FXE210E GF06UT 1K IC,CONVCMOS,A/D8-BIT,32US,SAR,DIFF IN,SER RES,FXD,FILM187K OHM,1%,0.2W,TC=T0Loss 10DB,PKG 7.2MM SQ,6.8MM HI MICROCKT,DGTLMICROCOMPUTER,8 BIT IC,DGTLTTL,BFR/DRVRHEX INV, OC, HI IC,MISCCMOS,ANALOG Swquad SPST,100IC,LINBIPOLAR,AMPLRF AMP,20DB MIXER,FREQ1-500MHZ TAIL,30 GLD CONN,BOXSHUNT/SHORTINGFEM,STR,1 X 2,0.1CTR,0.385 H,30 GLD,BLK,JUMPER IAL,MI,T&R Order by Desc RES,FXD,FILM267K OHM,1%,0.2W,TC=T0RES,FXD,WW1 OHM,5%,2W RES,FXD,CMPSN1K OHM,5%,0.50W CORE,EMTOROID,FERRITE CONN,HDRPCB/WIREWRAP,MALE,STR,1 X 7,0.15CONN,HDRPCB/WIREWRAP,MALE,STR,1 X 4,0.150 COIL,RFFIXED,150NH CONN,RF Plug A10SKT1Controlled 0LUA3 CA ASSY,SP Replaceable Electrical Parts Diagrams/Circuit Board Illustrations Page Assembly Numbers Diagrams/Circuit Board IllustrationsSymbols Component ValuesPage 1705A Spectrum Monitor With cross-references to schematic diagrams 1, 2, 3, 4, A3 Main Board Component Locator A3 Main Board A5 70 MHz Tuner Board Schematic Diagram 1 Component Locator Chart Local Oscillator 1705A Spectrum Monitor RF Input Schematic Diagram 2 Component Locator Chart Resolution Filter & LOG Detector 1705A Spectrum Monitor If Amplifier Schematic Diagram 3 Component Locator Chart Marker Band LinearityRamp Generator Generator Schematic Diagram 4 Component Locator Chart Filter DeflectionAmplifier Buffers Schematic Diagram 5 Component Locator Chart Microprocessor 1705A Spectrum MonitorMicroprocessor Trace Schematic Diagram 6 Component Locator Chart 1705A Spectrum Monitor Front Panel & 18V Supply A2 Front Panel Board A1 Power Supply Board A1 Power Supply Board Component LocatorSee Parts List for Effective Serial Number Ranges Line Rectifier SwitcherError Output Filters Schematic Diagram 8 Component Locator Chart A10 CRT Socket Board Front of Board HV OSC Error AMP1705A Spectrum Monitor High Volts Power Supply Grid DrivePage Replaceable Mechanical Parts Page Using the Replaceable Mechanical Parts List Section Replaceable Mechanical Parts This indicates the quantity of mechanical parts used Qty ColumnReplaceable Mechanical Parts Indicates actual manufacturer’s part number CHICAGO, IL Panduit Corp RidgelandRichco Nelson Name Plate CO Casitas FRAME,CRTBEZEL Circuit BD Assypower Supply See A1 Repl Mounting PartsCOVER,HOUSINGALUMINUM SCREW,MACHINE6-32 X 0.875,PNH,SST SCREW,MACHINE6-32 X 0.188,PNH,STL HOUSING,CKT BdaluminumFRAME,CHASSISSAFETY Controlled IN/OUT See A6 Repl Mounting Parts Standard only Optional Accessories Standard AccessoriesCLAMP,LOOP0.375 ID,PLASTIC,SAFETY CON Trolled CA ASSY,CRTDISCRETE,ANODE LEAD,CRT,1,22 A10