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Teradyne Z1800 Series, Руководство оператора

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3-2

OPERATING THE TESTER

Daily Operations

Because Teradyne recommends that you keep the tester power on except for maintenance 
and emergencies, daily operations do not include powering the tester on and off. For 
information about those procedures see the “Power On/Off Sequence” section in Chapter 1 
of this manual.

Verify that diagnostics have been run before you begin board testing. To ensure optimal test 
results:

•

Set up for static safety.

•

Check the printer.

•

Inspect the fixture.

Set Up for Static 
Safety

Antistatic safeguards which protect electronic components on the board-under-test include:

•

Static-dissipative work surfaces and grounding devices.

•

Conductive floor mats which plug into the wrist strap connection on the rear panel(s).

•

Operator’s wrist strap which plugs into the test jack panel.

TEST JACKS

ANALOG

DEBUG

DIGITAL

PULL-UPS

SCOPE

GROUND

NODE 

FINDER

WRIST
STRAP

E

F

G

E

F

G

S

S

S

Test Jack Panel

Antistatic Mat
(customer-supplied)

Wrist Strap

Connect to

wrist strap 

receptacle.

POWER

5A

UNSWITCHED

FILTERED

UNSWITCHED

UNFILTERED

WRIST
STRAP

START

PAD

GND

15A

ON

OFF

COMPUTER INPUT

Lower Rear Panel

Connect antistatic
mat to ground stud.

Wrist strap receptacle.

Z18OO

Содержание Z1800 Series

Страница 1: ...service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE IN...

Страница 2: ...Z1800 Series Teradyne Inc Assembly Test Walnut Creek 2625 Shadelands Drive Walnut Creek CA 94598 2597 Publication Number 1800M009 Copyright Teradyne Inc OPERATOR S GUIDE...

Страница 3: ...ion of Teradyne Inc is prohibited This software system is also an unpublished work protected under the copyright laws of the United States of America If this work becomes published the following notic...

Страница 4: ...system Fourth Edition December 1992 Version D 2 operating system Third Edition February 1992 Version D 1 operating system Preliminary Second Edition November 1991 Version D 0 operating system First Ed...

Страница 5: ......

Страница 6: ...4 Warning Terminology 1 5 Power On Off Sequence 1 5 Power On 1 5 Normal Power Off 1 6 Emergency Power Off 1 9 Emergency Manual Off Switch 1 9 External Hazards 1 9 Electrical 1 9 Mechanical 1 9 Safety...

Страница 7: ...cuum Switches 2 24 Rear Panels 2 26 Rear Panels Z1890 Z1888 Z1880 Z1808 Z1805 Z1803 Plus 2 26 Rear Panel Z1884 Z1860 NB Z1860 Z1840 Z1866 Z1850 2 27 Rear Panels Z1820 Z1800 2 28 Rear Panel Z1860M Z184...

Страница 8: ...Color 2 39 Printer 2 39 Chapter 3 Operating the Tester Daily Operations 3 2 Set Up for Static Safety 3 2 Check the Printer 3 3 Inspect the Fixture 3 3 Board Testing 3 4 Load the Fixture and Board 3 4...

Страница 9: ...IV...

Страница 10: ...aintenance Reference Z1800 Series Programmer s Guidebook and the Z1800 Series options documentation pertinent to your system For detailed information about the documentation set refer to the Getting S...

Страница 11: ...VI...

Страница 12: ...ions If specific questions arise about product safety or local requirements Teradyne is prepared to address these issues with any customer General Safety Information The tester is a Safety Class 1 app...

Страница 13: ...s of the tester Wear protective eyewear and nonflammable clothing Remove or cover conductive items such as rings and watches before using or servicing the tester Exercise electrostatic discharge ESD c...

Страница 14: ...ground straps whenever you are operating the tester Inform yourself about electrostatic charge phenomena discharge damage and methods to prevent problems Eliminate offending insulating materials such...

Страница 15: ...ing information in the manual It appears close to the documented area Alternating current power line The red and black danger label calls attention to a high energy electrical connection or a conceale...

Страница 16: ...r information about powering up the tester after installation or maintenance 1 Turn on the Power Control switch Turn on the switch at least 30 minutes prior to production use to ensure that the analog...

Страница 17: ...itions turn off the Power Control switch first to remove power from the tester See the Emergency Off Procedures section below Power Off Procedure for Vacuum Testers Z1890 Z1888 Z1884 Z1880 Z1860 NB Z1...

Страница 18: ...ture 4 Release the fixture by turning off the Interface Vacuum switch on the operator control panel 5 Remove the vacuum hoses from the fixture 6 Take the fixture off the fixture receiver You may choos...

Страница 19: ...am is producing dangerous voltages or other hazardous test situations due to a problem with the board under test Be aware that power remains on the line conditioner AC power control and unswitched use...

Страница 20: ...e back of the switch secures it in the desired position External Hazards Be aware of the hazards described below which are on the outside of the tester Hazards may be electrical or mechanical Electric...

Страница 21: ...s 2 Fixture receiver Warning Hazardous voltages may be present on fixture receiver during test Do not remove fixture receiver covers while a program is running Power may be applied to the fixture rece...

Страница 22: ...Extendable legs Used to level the tester and may be used to raise or tilt the entire tester Do not extend legs beyond the red mark or the leg may fall off Only qualified maintenance technicians shoul...

Страница 23: ...aker for user outlets 5 A 9 4 CB3 Circuit breaker for switched system outlets 9 5 Ground Used to connect your facility ground to the tester ground system Z1888 Z1888 1 Z1888 2 Z1888 Front Top and Righ...

Страница 24: ...ntrol switch turns power to the tester on and off However when the Power Control switch is off the unswitched outlets are still powered See the Emergency Off Procedures section for detailed informatio...

Страница 25: ...er 8 3 Remote The remote port connects remote control devices such as start pad and contains duplicate of control panel signals 9 AC power distribution assembly 9 1 Outlets 120 VAC outlets Electrical...

Страница 26: ...apparel Observe proper ESD precautions 4 Test jack panel When the analog debug LED is on and the High Voltage option is installed high voltage may be present on the E F and G test points The wrist str...

Страница 27: ...are connecting or disconnecting AC power the main circuit breaker must be in the Off position or the AC control fuse within the controller may blow 7 4 CB1 Mains circuit breaker 25 A 7 5 CB2 Circuit...

Страница 28: ...power is on The red LED indicates a fault 8 Test head bay rear panel 8 1 Computer input The computer input connects the computer I O cable to tester 8 2 Remote The remote port connects remote control...

Страница 29: ...running Power may be applied to the fixture receiver placing you at risk Keep fingers away from fixture receiver pins Remove rings watches bracelets or any loose or conductive apparel you are wearing...

Страница 30: ...r panels 5 1 Computer input The computer input connects the computer I O cable to tester 5 2 Remote On left test head bay rear panel only The remote port connects remote control devices such as start...

Страница 31: ...of the receptacles on the tester and wear it at all times when you are working on the system except when you are working on the AC power control or when you are otherwise instructed 3 Fixture receiver...

Страница 32: ...esent whenever Circuit Breaker 3 and the main AC breaker is on and AC power is connected to the power inlet 6 2 Main AC circuit breaker Do not connect or disconnect the AC power cord while the main AC...

Страница 33: ...pplied to the fixture receiver placing you at risk Keep fingers away from fixture receiver pins Remove rings watches bracelets or any loose or conductive apparel you are wearing Use proper ESD procedu...

Страница 34: ...tion 5 Test head bay rear panel 5 1 Computer input The computer input connects the computer I O cable to tester 5 2 Remote The remote port connects remote control devices such as start pad and contain...

Страница 35: ...pplied to the fixture receiver placing you at risk Keep fingers away from fixture receiver pins Remove rings watches bracelets or any loose or conductive apparel you are wearing Use proper ESD procedu...

Страница 36: ...protection 5 Rear panel 5 1 Computer input The computer input connects the computer I O cable to tester 5 2 Remote The remote port connects remote control devices such as start pad and contains dupli...

Страница 37: ...pplied to the fixture receiver placing you at risk Keep fingers away from fixture receiver pins Remove rings watches bracelets or any loose or conductive apparel you are wearing Use proper ESD procedu...

Страница 38: ...rotection 5 Test head bay rear panel 5 1 Computer input The computer input connects the computer I O cable to tester 5 2 Remote The remote port connects remote control devices such as start pad and co...

Страница 39: ...off When the Power Control switch is off the unswitched outlets are still powered See the Emergency Off Procedures section earlier in this chapter When the analog debug LED is on and the High Voltage...

Страница 40: ...nnects start pad to tester 4 6 AC power input Makes protective ground connection Hazardous voltage and current 4 7 Main AC circuit breaker Only one of the main AC circuit breakers is used The unused c...

Страница 41: ...panel Warning When the analog debug LED is on and the High Voltage option is installed high voltage may be present on the E F and G test points The wrist strap receptacle grounds the antistatic wrist...

Страница 42: ...cle This receptacle grounds the antistatic wrist strap Connect the wrist strap to one of the receptacles on the tester and wear it at all times when you are working on the system except when you are w...

Страница 43: ...ester ground system Z1803 Plus Z1803 1 Z1803 2 Z1803 Plus Front Top and Right Side 1 Emergency Manual Off EMO switch optional Push to activate Turn to deactivate Activating this switch has the same ef...

Страница 44: ...rol panel The Power Control switch turns power to the tester on and off However when the Power Control switch is off the unswitched outlets are still powered See the Emergency Off Procedures section f...

Страница 45: ...3 Remote The remote port connects remote control devices such as start pad and contains duplicate of control panel signals 9 AC power distribution assembly 9 1 Outlets 120 VAC outlets Electrical haza...

Страница 46: ...hen the Power Control switch is off the unswitched outlets are still powered See the Emergency Off Procedures section for more detailed information When the analog debug LED is on and the High Voltage...

Страница 47: ...floor mats You can also connect the antistatic wrist strap to this receptacle 4 5 Start pad foot control connection 4 6 AC power input Makes protective ground connection Hazardous voltage and current...

Страница 48: ...l powered See the Emergency Off Procedures section for more detailed information Pressing the Cancel switch stops test execution and returns to the start of the program See the Emergency Off Procedure...

Страница 49: ...signals 4 3 Wrist strap receptacle The receptacle is provided primarily for grounding the antistatic floor mats You can also connect the antistatic wrist strap to this receptacle 4 4 Ground GND WRIST...

Страница 50: ...red See the Emergency Off Procedures section for more detailed information Pressing the Cancel switch stops test execution and returns to the start of the program See the Emergency Off Procedures sect...

Страница 51: ...Wrist strap receptacle The receptacle is provided primarily for grounding the antistatic floor mats You can also connect the antistatic wrist strap to this receptacle 4 4 Ground 120V 5A 50 60HZ WRIST...

Страница 52: ...red See the Emergency Off Procedures section for more detailed information Pressing the Cancel switch stops test execution and returns to the start of the program See the Emergency Off Procedures sect...

Страница 53: ...signals 4 3 Wrist strap receptacle The receptacle is provided primarily for grounding the antistatic floor mats You can also connect the antistatic wrist strap to this receptacle 4 4 Ground GND WRIST...

Страница 54: ...er system Fixture receiver interface Vacuum system Fixture Computer This chapter describes the Z1800 Series testers and acquaints you with the controls and features you will use in the production envi...

Страница 55: ...Optional Vacuum Port 2 Emergency Manual Off Switch Fixture Receiver Interface Operator Control Panel Vacuum Port 1 Test Jack Panel COMPU TER INPUT REMOT E 120V 5A 50 60H Z I O CB3 I O CB2 POWE R T 16...

Страница 56: ...ar and Left Side View LISTEN WINDOW DIGITAL PULLUPS GS FS ES TEST ENVELOP E WRIST STRAP ANALOG DEBUG G F E DUT 5V POWER NODE FINDER Z1888 Emergency Manual Off Switch Optional Vacuum Port 2 Vacuum Port...

Страница 57: ...t Top and Right Side View Z1884 Rear and Left Side View EMO Tabletop Extension CRT Arm Fixture Receiver Test Jack Panel Operator Control Panel Test Head Bay Separate Power Supply Bay Levelers 120V 5A...

Страница 58: ...uum Port Dual Operator Control Panel Test Jack Panels Fixture Receiver Vacuum Port Test Head Bay Power Supply Bay Door Locks GND WRIST STRAP INPUT POWE R 15A 7 5A FILTER ED UNFILT ERED 5A UNSW ITCHE D...

Страница 59: ...Left Side View Stabilizing Feet Optional Vacuum Port Operator Control Panel Fixture Receiver Test Jack Panel Vacuum Port Test Head Bay Power Supply Bay DUT Test Head Power Supply Test Head Bay Power S...

Страница 60: ...n Z1860 Front Top and Right Side View Z1860 Rear and Left Side View Z1860 Table Top Extension Stabilizing Feet Optional Vacuum Port Operator Control Panel Test Jack Panel Fixture Receiver Vacuum Port...

Страница 61: ...r and Left Side View Z1850 Table Top Extension Stabilizing Feet Optional Vacuum Port Operator Control Panel Test Jack Panel Fixture Receiver Vacuum Port Door Locks Stabilizing Feet Vacuum Inlet AC Pow...

Страница 62: ...40 Front Top and Right Side View Z1840 Rear and Left Side View Stabilizing Feet Optional Vacuum Port Operator Control Panel Test Jack Panel Fixture Receiver Test Head Bay Power Supply Bay Door Locks V...

Страница 63: ...20 Rear and Left Side View OFF ON TEST HEAD POW ER OFF ON DUT POW ER POW ER COM DUT 5V 5V 8V 18V 18V 120V 120V OPTIO N DUT 5V ADJU ST T H 5V ADJU ST Z1820 Vacuum Port Operator Control Panel Test Jack...

Страница 64: ...iew CRT Arm Optional Vacuum Port 2 Emergency Manual Off Switch Fixture Receiver Interface Operator Control Panel Vacuum Port 1 Test Jack Panel COMP UTER INPUT REMO TE 120V 5A 50 60H Z I O CB3 I O CB2...

Страница 65: ...terface Z1803 Plus Front Top Right Side Z1803 Plus Rear and Left Side View CRT Arm Optional Vacuum Port 2 Emergency Manual Off Switch Fixture Receiver Interface Operator Control Panel Vacuum Port 1 Te...

Страница 66: ...s are housed in one console Z1800 Front Top and Right Side View Z1800 Rear and Left Side View Z1800 Operator Control Panel Test Jack Panel Fixture Receiver Vacuum Port Stabilizing Feet Door Locks Vacu...

Страница 67: ...equirements Z1860M Front Top and Right Side View Z1860M Rear and Left Side View Operator Control Pod Driver Receiver Cables Test Jack Panel Door Locks Power Supply Bay Stabilizing Feet Test Head Bay G...

Страница 68: ...t Top and Right Side View Z1850M Rear and Left Side View Stabilizing Feet Operator Control Pod Test Jack Panel 120V 5A 50 60HZ WRIST STRAP CB1 INPUT PWR CB2 15A I O I O T 16A 25V 120V 5A 50 60HZ COMPU...

Страница 69: ...requirements Z1840M Front Top and Right Side View Z1840M Rear and Left Side View Stabilizing Feet Door Lock Driver Receiver Cables Test Jack Panel Test Head Bay Operator Control Pod Power Supply Bay G...

Страница 70: ...trol Interface Vacuum Start and Cancel switches are illuminated when test head power is on Operator Control Panel Z1890 Z1888 Z1884 Z1880 Z1860 NB Z1860 Z1850 Z1840 Z1808 Z1805 Z1803 Plus Operator Con...

Страница 71: ...ver 2 Power Control Turns on power to tester 3 Fixture Vacuum 2 Enables optional left hand vacuum settings are Manual vacuum always on Off vacuum never on and Auto vacuum controlled by test program 4...

Страница 72: ...and Fix 2 fixture 2 The Start and Cancel switches are always illuminated when test head power is on The fixture switches are also illuminated when on Item Switches Function 1 Start Initiates or contin...

Страница 73: ...h to activate it Activating the EMO has the same effect as pressing the Power Control switch on the operator control panel with one exception once activated the tester cannot power up again until it i...

Страница 74: ...lights up when built in termination resistors are in use 4 E F G Poles Tip jacks E Es Esense F Fs Fsense G and Gs Gsense monitor signals during program development The E F and G analog drive and sens...

Страница 75: ...rnal resistor 2 Node Probe Black banana jack Connects Node Probe to tester ground 3 DUT 5V Power Green LED indicates when DUT 5V power supply is on 4 9 E F G Poles Tip jacks E Es E sense F Fs F sense...

Страница 76: ...analog debugging The same six jacks are connected to the six digital response buses during digital debugging 7 Listen window Tip jack Identifies the measurement interval 8 Test envelope Tip jack Ident...

Страница 77: ...ch Z1820 The Interface Vacuum switch located in a well adjacent to the fixture receiver interface controls the application of vacuum to the fixture In the On position it pulls the fixture onto the tes...

Страница 78: ...h located in a well adjacent to the fixture receiver interface controls the application of vacuum to the fixture In the On position it pulls the fixture onto the tester s fixture interface The Interfa...

Страница 79: ...in cooling the tester s interior It has either quarter turn screws or three turn screws to lock it in place The rear panel is recessed It can be removed for maintenance The rear panel has a computer i...

Страница 80: ...ap receptacle and ground The panel for System B has a computer input a wrist strap receptacle and ground The rear panel of the Z1850 tester contains the computer input the remote port the wrist strap...

Страница 81: ...o tester 2 15A Circuit Breaker 15A circuit breaker 3 Circuit Breaker Cover Circuit breaker cover prevents access to the circuit breaker not in use 4 Main AC input Input for AC power cord 5 Start Pad C...

Страница 82: ...green power LED lights when power is applied to the AC mains inlet and the AC main circuit is on The red Fault LED lights when an out of range voltage or an emergency off signal is detected Either an...

Страница 83: ...12 Z1888 Addition of 12 Item Name Function 1 Fuse T 16A 125V Line monitor board protection 2 Fault light Red LED indicates detection of out of range voltage or an emergency OFF signal 3 Power Green L...

Страница 84: ...r detects faults it cuts power to these outlets 3 Power Input Connects AC power 4 CB1 25 A AC Mains circuit breaker to switch AC power on off 5 CB2 5 A user outlets circuit breaker for four user unswi...

Страница 85: ...r on off 3 User Outlets Breaker 5 A circuit breaker for user unswitched outlets 4 Wrist Strap Connects wrist strap or antistatic mats 5 Ground Connects to ground 6 Switched System Outlets Eight 120 VA...

Страница 86: ...ters have 1024 prewired pins Additional interface pins are provided for DUT power supplies user relay array connections grounds and other auxiliary features Item Name Function 1 Guide Pins Align fixtu...

Страница 87: ...re provided for DUT power supplies relay array connections grounds and other auxiliary features Item Name Function 1 Guide Pins Align fixture on fixture receiver interface 2 Receiver Vacuum Port Enabl...

Страница 88: ...ional interface pins are provided for DUT power supplies relay array connections grounds and other auxiliary features Item Name Function 1 Guide Pins Align fixture on fixture receiver interface 2 Rear...

Страница 89: ...ace pins are provided for DUT power supplies relay array connections grounds and other auxiliary features Item Name Function 1 Guide Pins Align fixture on fixture receiver interface 2 Receiver Vacuum...

Страница 90: ...ds and other auxiliary features Fixture Receiver Interface Z1860M Z1850M Z1840M Z1860M Z1850M and Z1840M tester interface to the driver receiver boards is via ground plane ribbon cables permitting fle...

Страница 91: ...iary features Item Name Function 1 Guide Pins Align fixture on fixture receiver interface 2 Receiver Vacuum Port Enables fixture to be pulled down on interface 3 Rear Well Switch Senses when a double...

Страница 92: ...a radio frequency stimulus technique to deliver high fault coverage over a range of device types and fault classes Important The second vacuum valve is standard for the Z1890 Z1884 and Z1866 but it is...

Страница 93: ...2 40 TESTER DESCRIPTION...

Страница 94: ...in the two sections Daily Operations and Board Testing The section titled Testing Digital Connectivity describes a tool used for testing the connectivity of digital components The section titled Anal...

Страница 95: ...r Static Safety Antistatic safeguards which protect electronic components on the board under test include Static dissipative work surfaces and grounding devices Conductive floor mats which plug into t...

Страница 96: ...against making copies of pages for use around testers photocopies may carry electrostatic charges Check the Printer Check that the diagnostic printer is working properly and that it has enough paper I...

Страница 97: ...n align the fixture to the fixture receiver pins and the vacuum seal 2 Turn on the Vacuum Interface switch to pull the fixture on to the fixture receiver interface For the Z1890 Z1884 Z1880 Z1860 NB M...

Страница 98: ...user manual for the unit you are using Log In After you have loaded the fixture and board make sure you follow all safety precautions regarding power and setup before you apply power to the board Saf...

Страница 99: ...rator permissions are Program Select File Manipulation Program Execute Node Probe Tools and GFI Execute Test Boards Testing Interface The testing interface consists of Menu bar at the top of the testi...

Страница 100: ...buttons are Stop on Fail SOF Hold HLD Repeat RPT and CRT which displays test step messages on the screen as the program runs These Test Control buttons give you control over test execution ICT or FST...

Страница 101: ...mouse or press the Enter key To continue program execution select No When you activate the SOF editor the worksheet for the failed component will appear on the screen enabling you to make necessary c...

Страница 102: ...ne at the bottom of the screen shows the measured values node pin and whether that test step passed or failed Running the Test Program Running the test program requires you to select the test program...

Страница 103: ...operator control panel The Main menu remains on the screen while the program is running The program runs until you Press the Escape key Press the tabletop Cancel button on the operator control panel P...

Страница 104: ...fied in the program For information on enabling Digital Tracer in the software see the Digital Tracer section in Chapter 9 Test and Debug Tools in the Z1800 Series Programmer s Guidebook Important Dig...

Страница 105: ...t be represented on a single video image rows of pins are represented as line segments which change color as you probe the pins Multiple pins can be represented by a single pin graphic for large digit...

Страница 106: ...as you face the front of the tester pin1 moves the pin graphic indicating pin 1 counterclockwise around the device moves the pin graphic indicating pin 1 clockwise around the device top and affects on...

Страница 107: ...board when the board is mounted on the tester from your perspective as you face the front of the tester Tracer Pin Check Utility Please orient device ID NAME C TPD TSTTRCR ICT Files Edit Run Pgen Set...

Страница 108: ...the screen The options are described below Package Press P to toggle between Dip or Quad Choose DIP if you have pins on two sides Choose Quad if you have pins on four sides Orient Press O to specify t...

Страница 109: ...he Start button a message like the one below appears at the bottom of the screen prompting you to probe the component pins Tracer Pin Check Utility Please probe all device leads on ID NAME Brush the p...

Страница 110: ...g Printout of Test Results The test program can be set up to send test results to the printer Typically the printout states the date and test time The printout can list the node numbers of open connec...

Страница 111: ...ector NODE 210 PIN 3 STATES 2 5 7 NODE 212 PIN 5 STATES 2 6 8 NODE 214 PIN 7 STATES 2 11 13 NODE 217 PIN 9 STATES 2 22 NODE 220 PIN 12 STATES 2 5 7 NODE 222 PIN 14 STATES 2 3 NODE 227 PIN 18 STATES 2...

Страница 112: ...Power Node 18 Digital Bus 23 Stuck LOW CRC 0000 NODE 200 PIN 1 CRC 0000 NODE 201 PIN 2 CRC 0000 NODE 202 PIN 3 Mixed mode test for DAC0802 Test terminated Interconnect problem Test terminated Analog p...

Страница 113: ...then connect the power cord to the tester Check that the main AC breaker is on after the tester is connected to the AC power source Inconsistent Board Failures Problem Inconsistent board failures occ...

Страница 114: ...present Solution Plug in and turn on the vacuum Press the Pump Start switch if you use a local pump Check that the vacuum control switches are on Insufficient Vacuum Problem There is less than 20 inch...

Страница 115: ...3 22 OPERATING THE TESTER...

Страница 116: ...lectrostatic discharge 1 3 Emergency Manual Off switch 1 9 2 20 emergency off procedure 1 9 EMO see Emergency Manual Off switch ESD see electrostatic discharge F failure messages 3 17 3 18 3 19 fixtur...

Страница 117: ...anel 2 17 2 18 2 19 operator control pod 2 20 Power Control 1 5 1 8 symbols safety 1 4 T temperature range for safe operation 1 1 Teradyne Product Safety Standards 1 1 test controls Cathode Ray Tube C...

Страница 118: ...service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE IN...

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