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TXR 325D, Maintenance Manual

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TXR 325D Maintenance Manual Download Page 8

Standard Frequency Series Generators

Maintenance

iv

M-2008-7-15

 

7.6  Troubleshooting Timing – High Tension – Filament ............................12-13

 

7.7  Troubleshooting High MA ...................................................................14-15

 

7.8  Troubleshooting Gassy X-ray Tube ....................................................16-17

 

7.9  Troubleshooting Low MA .........................................................................18

 

7.10 Troubleshooting No MA ......................................................................18-20

 

8  COLLIMATOR ..................................................................................................21

 

8.0  Theory of Operation .................................................................................21

 

8.1  Mechanical Operation SID Selection .......................................................21

 

8.2  Electronic Operation ................................................................................21

 

8.2.1  Power Supply ...............................................................................21

 

8.2.2  Light – Field Lamp Circuit ............................................................22

 

9  X-RAY CONTROL COMPONENT LOCATION ................................................23

 

9.0  Full View of Console Components ...........................................................23

Summary of Contents for 325D

Page 1: ...MEDICAL SYSTEMS Technical Publication M 2008 7 15 Maintenance Manual For Maintaining and Troubleshooting STANDARD FREQUENCY SERIES GENERATORS Contents Models TXR 325D TXR 325M TXR 425 TXR 525SFQ...

Page 2: ......

Page 3: ...sibility of any persons carelessly unwisely or unknowingly exposing themselves or others to X radiation It is important that everyone working with X radiation be properly trained and take adequate ste...

Page 4: ...ycle of the equipment or system comes to an end becomes dangerous and need to be considered as harmful waste according to the international domestic and local regulations The manufacturer recommends t...

Page 5: ...ng advisory symbols will be used throughout this manual Their application and meaning are described below DANGER ADVISES OF CONDITIONS OR SITUATIONS THAT IF NOT HEEDED OR AVOIDED WILL CAUSE SERIOUS PE...

Page 6: ...g documents Ionizing radiation Type B equipment Dangerous voltage Ground This symbol indicates that the waste of electrical and electronic equipment must not be disposed as unsorted municipal waste an...

Page 7: ...4 4 6 MA Stabilizer 4 5 TROUBLESHOOTING TECHNIQUES 5 5 1 Establishing Troubleshooting Techniques 5 5 1 1 Essentials Required for Producing X ray 5 5 1 2 Three Key Indicators for Effective Troubleshoot...

Page 8: ...7 8 Troubleshooting Gassy X ray Tube 16 17 7 9 Troubleshooting Low MA 18 7 10 Troubleshooting No MA 18 20 8 COLLIMATOR 21 8 0 Theory of Operation 21 8 1 Mechanical Operation SID Selection 21 8 2 Elec...

Page 9: ...2008 7 13 M 2008 7 14 and M 2008 7 15 Schematics are located in manual M 2008 7 13 1 1 TOOLS AND TEST EQUIPMENT REQUIRED FOR SERVICING X RAY SYSTEMS The following hand tools and products are required...

Page 10: ...ements in bold lettering throughout this manual WARNING You are to have proper instrumentation to measure all energies used in and emitted from this equipment At no time are you to expose a person to...

Page 11: ...ched to Bucky ON change the switch to Bucky OFF and retest If exposure meets condition of 5 above trouble is in the bucky circuit 7 If there is still no exposure initiated under condition 6 the proble...

Page 12: ...of the Transformer so it can be stepped up to high voltage and Rectified for use by the X ray Tube 4 3 HIGH VOLTAGE TRANSFORMER High Voltage Transformers do not regulate current or voltage Its sole pu...

Page 13: ...se provides the Keys to establishing effective troubleshooting Techniques The indicators are 1 High MA which can cause light images dark images and kicking circuit breakers 2 Low MA which mainly cause...

Page 14: ...gh voltage secondary Because of loading kVp will decrease at the X Ray tube The bucking voltage selected from the 95 110 VAC supply bucks H1 to H2 Voltage The final Voltage difference is coupled to th...

Page 15: ...readings are from the X ray Timer s software 6 3 MA METER The MA meter is a simple Digital resistor diode Display that indicates MA stations selected This meter cannot be adjusted 6 4 TESTING HIGH VO...

Page 16: ...across major to minor line strap Should read 200 278 VAC Control Energizes but LED s are not lit Open fuse or loose fuse holder A1 or A2 With Line to Auto Strapped properly and with the Circuit Breake...

Page 17: ...sert Check continuity of tube stator You should find continuity between any pair of the three 3 terminals Gently shake Tube Head or look into port to see if X ray Tube is BROKEN If the tube is broken...

Page 18: ...posure is now possible Replace the EXPOSURE SWITCH TIMER SECTION 4 During Timer Standby continuous 120 VAC is required on Timer Pins J1 2 and J1 4 Place volt meter between those pins and confirm volta...

Page 19: ...ed to the Bucky Motor Circuit B3 to B4 The Bucky Motor begins to drive and move the x ray filter grid across the front of the receptor for as long as the switch is depressed At some point the x ray fi...

Page 20: ...en VISUAL INSPECTION Remove Collimator Select large and then small X ray filaments See if each filament lights up during PREP If both filaments light up properly the problem is in another area Disrega...

Page 21: ...se EXPECTED VOLTAGE MEASUREMENTS WHEN A SHORT CIRCUIT EXISTS 2 Measure voltage from XC to XS or XC to XL With Prep Switch depressed voltage should be 100 200 VAC If it is remove the collimator and obs...

Page 22: ...t is or is not operating properly SIMULATED LOAD TEST 1 Remove P1 P2 power cord from the Primary of the High Voltage Transformer 2 Place a Volt Meter between H1 and H2 terminals on the X Ray Control M...

Page 23: ...ion of High Tension AC Current The Full Wave Bridge rectifies this current to DC DC current measurements dc milliamperes and are taken from and terminals on the Motherboard After the rectifier AC conn...

Page 24: ...the tube is exposed above 50 kVp at 50 MA Tubes may conduct properly when cold but become unstable when they warm up There is no one set way to measure how gassy a tube has become If a tube is only s...

Page 25: ...ake an exposure If MA is present you must replace High Voltage Rectifier Board You must establish the reason the Rectifiers shorted Normally a High Voltage Cable shorted or the X ray Tube became gassy...

Page 26: ...dropped To test the High Voltage Rectifier Board and wiring remove the transformer from the tank and inspect all wiring and connections using a OHM Meter Open Space Charge Primary Transformer Open sp...

Page 27: ...and the other on the S or L pin depending on which focus is selected Depress PREP and measure voltage If 15 16 VAC is present filament transformer is OK If voltage is not present check input voltage X...

Page 28: ...move fuse 4 and measure resistance across the 2500 ohm resistor If the resistor is OPEN replace it NOTE If the 2500 ohm resistor heats up or opens you may have a short from MT 1 to MT 2 to a winding o...

Page 29: ...are positioned manually with these knobs Back illuminated SID scales indicate all conventional film sizes for both 100 cm and 180 cm SID s as well as 40 inches and 72 inches in SIDs All Eureka Linear...

Page 30: ...F3 on the power supply board and then to collimator receptical connections C and D 8 2 2 LIGHT FIELD LAMP CIRCUIT Refer to Schematic 70 08372 and Assembly Drawing 70 08371 This drawing is provided in...

Page 31: ...tor Exposure Switch Prep Switch Earth Ground Earth Ground L1 L2 Connection Bucky Switch Timer Board 50 100 MA Adjustments 150 500 MA Adjustments SCR X Ray Tube Rotor Connections 07 08 09 Backup Contac...

Page 32: ...se for planning or training BMET s MANUAL COST PER COPY Pre Installation Manual M 2008 7 12 20 00 Installation Manual M 2008 7 13 35 00 Operation Manual M 2008 7 14 25 00 Maintenance Manual M 2008 7 1...

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