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HE425 Generator Manual - Spectrum Medical X
Contents
1. WHT 7 1 BLK 1 s t 5v lt gt 1 1 D 6 400MA BLU 6 z BRN 2 D 5 300MA GRN SI n Shs RED 3 fo 0 litt e 2 E 6 DSP1 2 9 8 6 DSP1 D D 4200MA ORG 4 4 ORG 4 m Sai SD 3100MA__ REDS TS HI al DIES GRN 5S TS 4 H 4 4 x 4 3 4 4 x OD 2 50MA BRN 2 BS lt x SLs Y slo SR Sa DT MA BK TT IT It II II a II II It II je MA SW SHOWN FULL 2 GND III L LI FT z CCW LOWEST MA gt 23 POS BINARY ST 15 e lle Tele le lle le te Y TIME SEL SWITCH D a D a ABCDEFG P ABCDEFG P 5 VOLTAGE STABILIZING VOLTAGE STABILIZING 17 4 2 11 s 3 1742115 Ja TRANSFORMER 465 101 02 TRANSFORMER 465 101 00 1 H 1 H 60 HZ ONLY 50 HZ ONLY ci Hi ce xi He xe 111111111111 Hi a 1 2 3
2. SCH EMATIC EE HE425 C NTR PAGE 1 REV 1 90 60HZ 1 E yi Vee
3. TIME SEL VCC 1 RI 2 13 16 2 TAN 2 w ve R2 Pi y 2K COMPD KV ADJ 1 00K a u MAB i 2 i 1 vec i 12 2 a 10 MAT 10 0 5V 1 5V a com p Maz KI e Ri 5 2 SR ele MA2 S L Natm324 e 1 3 fe NS Kz TE L out z DZ 40 2K U2 A 1 a Eelko e N bi 1 COMPD KV R91 gt SS ve x US A gt MAJ MIN 2 1 4A e 2 ji x lobo ooo e S Sly VCC na K ili 74HC4051 es E LM324 gt Vee D RS 11 o 3111917 5 3 1 n NA 1 2 aL 2 H2 i NAZ 1 m x c VCC A VVVVVVV LESS _5y 8 YA se SES H1 E os 2 A TO ADJ PANEL A By EZO eS SE vwe RI AAAAAAA 1uF Y 223 4 ZF 2 4 dl 100K R15 prise 4218 E Y K 1 2 S ALT ZCO Z a R4 koh dalaga us VEC Des 1 A 2 SEE NOTE 1 P1 P2VOLTSTO H2 2 amp H2 4 BAZ L 974 LM324 m DOE LUE le ve LP a SS kw N n MAD i 2 lag a Aro MAI KY o Lo on 392K 5 13 2 A AZ pa PAS lt A VSS c39 HS uni frais vec VCC U14 4917 l ll E 49 9K U9 A a E Lut 2 1 1 2 yo B EQUAL c B z 15 v 3 VCC 3 Le E RST X ce C15 SE R37 A VCC 3 4 14 Jeer DI gt C a va A B BS y D2 2 5 IS aki 7 1 l eso E STORE __ D3 gt l E a3 10 4 tur 7 k ai 0047uF 1 11 U9 E H
4. Universal HE425 X Ray Generator Installation Operation amp Service Manual GA CT HN P N 8000 HE425 Revision D November 18 2005 HE425 X Ray Generator Revision D Periodic Maintenance Revision History Revision Date Description A 03 15 2002 Initial release 05 13 2002 Small spot MA station changes schematic value update and part number change B C 10 28 2004 Remove text page 29 D 11 18 2005 Upgraded to UL 60601 specifications and also upgraded schematics In the event of a malfunction that has contributed or could contribute to a patient or operator injury please contact In North America Del Medical Imaging Corporation 50B North Gary Avenue Roselle IL 60172 Tel 847 288 7000 Fax 847 288 7011 2002 Universal 11 18 05 page ii MANUAL IMPROVEMENT RECOMMENDATION We at Del Medical Imaging Corporation are most interested in improving the quality of the Technical Documentation we provide Please identify improvements or corrections and fax them to our Technical Publications Department Name Dealership Manual Part Number Device Name Recommendation or Correction Technical Support 847 288 7000 Fax 847 288 7011 e mail tech_support delmedical com 2002 Universal 11 18 05 page iii TABLE OF CONTENTS RE Bel ele EE il Applicable Standards sise 1 Ale leet NEE 2 INTRODUCTION cu coito ihre 2 Use otthis Malvina ita 2 e EE 2 Maxim
5. TB3 ZAVAC ZAVAC 24VAC RTN 24VAC RTN 24VDC 24VDC 24VDC 24VDC GONSCSSNE 9 CND 18 AWG CABLE SUPPLIED WITH FMTS GRN YEL 1A TB3 10 TABLE B8 11 wALL B8 12 120VAC 13 TABLE B4 Ee COLLIMATOR CABLE SUPPLIED WITH COLLIMATOR COLLIMATOR 15 TABLE B3 16 WALL B3 HEAD 17 TABLE B2 18 WALL B2 19 TABLE BI 20 WALL B1 NOTES WHEN CONNECT BUCKY REMOVE JUMPER BETWEEN TB4 18 AND TB4 19 RT100 TATBLE JUMPER PIN 3 TO 13 ON P106 GRNZYEL GRN YEL 6 C 18 GA TABLE BUCKY CBL 5500 2399 65 65FT 6 C 18 GA WALL BUCKY CBL 5500 2399 65 65ET 6 C 18 GA TABLE BUCKY CBL 5500 2399 65 65FT 120 VAC POWER 6 C 18 GA WALL BUCKY CBL 5500 2399 65 65FT 2 CONDUCTOR CABLE SUPPLIED WITH WALLSTAND POWER CABLE XXXXXX IF NOT USE USE ELECTRICAL TAPE TO SECURE THE WIRES 2 COND SUPPLY 24VDC TO 120 240 VAC POWER GRN YEL 3 CND 16 AWG POWER CORD SUPPLIED WITH FMTS 6 C 18 GA WALL BUCKY CBL 5500 2399 65 65FT DEL ME ICA HE425 FMTS RT100 3546E MC 150 TO MAIN POWER DISCONNECT 034 5076S SHEET 7 REVISION 2 ECN 8003 10 29 07 WALL STAND 3546E 1 2 B1 1 B2 2 B4 N B8 L B6 6 H V TANK H V CABLE K 3375 60 H V CABLE K 3375 60 HE425 GENERATOR ANODE CATHODE FILAMENT CABLE 463 101 00 RO
6. ii 37 Preventative Maintenant irsinin iiaiai eied iaaii eina aiei aeii eaat 37 Cleaning Instruction sise 37 Cleaning instruction iii d rives 35 2002 Universal 11 18 05 page v HE425 X Ray Generator Revision D Introduction Applicable Standards This X ray generator complies with the following regulatory and design standards FDA 21 CFR Subchapter J UL60601 1 CSA C22 2 No 601 1 EN60601 1 IEC 60601 1 IEC 60601 1 2 and IEC 60601 2 7 Degree of protection against harmful ingress of water IPXO Ordinary Type of protection against electric shock Class I Mode of operation 0 5 Duty Cycle Equipment not suitable for use in presence of a flammable anesthetic mixture with air or with oxygen or nitrous oxide a Degree of protection against electric shock is Type B applied part A The function and intended application of this equipment is general radiography for human use Definition of symbols Warning symbol used to indicate a potential hazard to operators service personnel or to the equipment It indicates a requirement to refer to the accompanying documentation for details This symbol states that there is accessible Dangerous Voltage This symbol states that this product is categorized as Type B This symbol identifies the Protective Earth Terminal 2002 Universal 11 18 05 page 1 HE425 X Ray Generator Revision D Introduction Abbreviations mm millimeter cm centimeter Kg kilogra
7. 12A_63 0V SR 2 8 N LE oma not 280 182 sin P SSS e 13A 50 3V DE gt E F3 1A R 2 Oo 1 7 p rior Bo 144 16 2 3123 2 sa 12 6v_ alle F2 8A TS 8 9 16A Z as LET RIGHT 115 230v 18 18v T oak Ser e OCIO SPACE CHG XFMR IS ONLY ACTIVE DURING PREP amp EXP 19A 0 0V 8 gt 8 120A 120V ENE 5 Et WW S 8 Q si 1208 ov T mwe 124 28 8 14 4VAC LEFT PIN L SA pe PLEASE REFER TO THE SCHEMATIC OF THE STATOR DRIVER 128 14 4V 1 ABGI CHASSIS GND CHASSIS GND CIRCUIT PART NUMBER 124 5076S FOR A COMPLETE CIRCUIT 1288 _14 4V 3 ABGZ XL FILAMENT VOLTAGE IN MA AC 120 Q 0v LEFT it cr WO 6 9 1 12 BOOSTED XL FIL VOLTAGE OUT m OP ai a g 4 4 ai 24A 25 1V l 14 4vac RIGHT PIN S a si AIP L dla ee 2aovac HIGH LI ne 2 2 di Il SER BACKUP SCR BLOCK MA Lo ua 11 ue Se S 3 ze iy lt 240VAC LOW LA Zi LEFT PIN E S 2 312VDC YE 120VAC CPO Sl lo 1 AMG 2 lt 8 oti 1 ma 24D ov IS0 3_AMGZ 115 230v 18 18 F alll be y Y SLE MA OVERLOAD MA OVER TOAD 07 FN 2 FI 1 8A 2 AMGI ore SENSE Ke 211 LEA Pres VOLTAGE BOOST FOR e o fo RIGHT RIN LARGE FOCAL SPOT SWITCH OFF MAJN POWER TO RELEASE K3 08 RIN THRU GAP LI ejje SCR2 MAIN SCR BLOCK i IF MA OVERLOAD bas LOCKED OUT Sa 6 5 RL BA 09 START E o 3 LEFT RIGHT AC 088 d a STATOR CAP JI 4 E allo 2AVAC amp DC LOADS pos c2 25 35uFD gt 300V k i gt gt 2 EIS CHASSIS 3 BRI can DU 24V G E ki ANA J3 1 E t 160 5W T j 3 f ollo f TETI e eke Ho speed ofl e a 1
8. 2 Adjust the 300 mA KV Offset pot MA5 until the kVp meter s pre read indication matches the measured kVp output 3 Select 120 kVp Make an x ray exposure and adjust the KV Slope pot MAS until the kVp meter s pre exposure indication matches the measured kVp output Repeat steps 1 2 and 3 until no further adjustments are necessary 4 Check final kVp meter tracking over the entire kVp range Under normal conditions the kVp meter s indication will not deviate from the measured kVp output by more than 5 kVp 400 mA Station large focal spot 1 Select 400 mA and 50 kVp While monitoring the mA and kVp outputs compare the measured kVp to the kVp meter s pre exposure indication 2 Adjust the 400 mA KV Offset pot MA6 until the kVp meter s pre read indication matches the measured kVp output 3 Select 100 kVp Make an x ray exposure and adjust the KV Slope pot MA6 until the kVp meters pre exposure indication matches the 2002 Universal 11 18 05 page 26 HE425 X Ray Generator Revision D Calibration measured kVp output Repeat steps 1 2 and 3 until no further adjustments are necessary 4 Check final kVp meter tracking over the entire KVp range Under normal conditions the kVp meter s indication will not deviate from the measured kVp output by more than 5 kVp 2002 Universal 11 18 05 page 27 HE425 X Ray Generator Revision D Theory of Operation THEORY OF OPERATION Turn ON sequence The incoming line
9. The Ohmmeter should now measure approximately 15 Ohms if relay K1 is operating properly 2002 Universal 11 18 05 page 34 HE425 X Ray Generator Revision D Diagnostics e Turn power OFF e Check diodes D11 and D12 with the Ohmmeter Shorted or open diodes must be replaced If an SCR is suspected as being bad then order a replacement 2002 Universal 11 18 05 page 35 HE425 X Ray Generator Revision D Renewal Parts Renewal Parts Main Control Board 60HZ 124 5088 Operating Firmware 60 Hz 622 5079G1 Operating Firmware 50 Hz 622 5080G1 KV Adjust Board 470 100 02 Stator Drive Board 124 5076 CV Transformer 60 Hz 465 101 022 Cap for 60 Hz CV Transformer 2 MFD 3407 0205 50 Hz CV Transformer and Capacitor 5602 0094 MA Selection Switch 23 position 161 101 00 Time Selection Switch 470 100 05 kVp Major or Minor Selector Switch 3481 0405 Seven segment display assy for kVp or mAs 470 300 00 PREP or EXPOSE Switch 161 100 01 Bucky Selection Switch 161 100 06 Power ON or OFF Switch 161 100 00 Knob for kVp Major or Minor switch no pointer 632 5028 Knob for Time or mA selector switch with pointer 133 101 02 Cable assy for kVp display 126 5167G1 Cable assy for mAs display 126 5168G1 Cable assy from main control board to kV adjust board 163 101 00 Transformer Filament or Large Filament boost T
10. pe 6 AENA 74HCT14 TZ 74HCT08 CTR RESET SH A Z oc2 asx do 74HCT18 ce 2 1N4804 2 H4 HITAA40T PS SE 28 H Ki 1 se ss D LIT vo VEC vet 3 1 z uF H 349 8S9 i D A Sla 2 1 vec STE p 2 LED4 R58 ox e ess c26 YCC ae KA 1 SCOR FALL 209K ni EXP SIGNAL Rd Es IA o Lie Ze 3 N97 DI Ki oe x vec A B vec 24VAC ONLY Bo 4 vee 1uF 1 3 5 AB ti N a12 C LED3 PETS N HTTAA4OT LEDI U21 A ide 8 leno api 12 ee o 4 3 B A BU ON D sq 2 3 I 12 EPI ha iN lt EXP SW g SET 1 Al 15 EPZ 4 99K Gen va AU alfa 1 A m Youn VEC NS EP3 2 eil 3 a m 3 CLK A3 ZTX692B E z e ES A R gt 5 Tk h 2 U26 o Y 6 NN ST L 4 YH B g gs 8 qo 2 our po 2 POR 10 5 2 256 ob RST A Ne 4 5 los pi Pa a on E a en gt 1027 BL ave as Bnp Dt SE 9 01 Q14 le 2 be Ka 8 EXP LATCH OT 3 A lt B A lt B_ B3 EPZ 6 192 R83 Fa gt MAIN 2 2 L 412V leie 16 EP4 MEP3 5_ 93 l z re OARS Th enD iz ES 74HCTBS EPA 3 Ei 4 pal Ne SCR FAULT 1 NAL ig 1 R82 gt vec zl E Has 1 ZIX6928 e SENSE INE 3 4 AS MEP 13 Y Se 49 9K f ysg our sa Ras MESE 1209 T 2 i a A Nal 4 5 las PEU Pos NEPI 14 Gs aX SAB 16 ec ABS 6 Jae B2 pee 15 oun 8 Ge Ge OT 5 A lt a TB 85 PQZ L Ge g a fi 6 ER VOL ADJ i lie aa 5 Jun 012 11 Jeer N At 128 74HCT85 D SPs 25 U28 a N Ier U15 C A3 hi 4040 Xx Lo z Wi w2 U6 C a 10 9 Pas re E SS 11 ESP 6 5 8 5 Sech BE Pas EE oz le BLK ka E 8 10 9 6 14 U16 E R74 3 MAIN SCR FAIL SEH BCL 10 BIT COMP Fi
11. 11 18 05 page 29 HE425 X Ray Generator Revision D Theory of Operation value of the register inside U14 and then resets it In this manner the voltage is converted into proportionate pulses which are counted and displayed again as voltage kVp This metering system is self compensating for variations in the incoming line which eliminates the need for manual line compensation Exposure Sequence The exposure sequence begins by depressing the PREP switch on the operator s console This provides 120 VAC to the stator drive PCB which closes the K3 relay switching the primary filament voltage from standby to the boost level as selected by the mA switch and providing power to the space charge transformer At the same time relay K1 on the stator drive PCB is also activated which provides the 240 VAC boost voltage to the stator of the x ray tube At the end of a 1 2 to 1 5 second delay which is timed on the stator drive PCB relay K4 closes lighting the ready light behind the PREP switch and enabling the 24 VDC voltage that will be used to initiate the actual exposure on the main control board connector H4 At this time relay K1 opens and K2 closes removing the 240 VAC boost from the stator and applying the 50 VAC run voltage When no Buckys are selected the 24 VDC signal is routed through the exposure switch to connector H4 through the normally closed contacts of the Bucky Enable relay K5 If either Bucky has been selected t
12. 2 3 4 5 617 8 9 halt 1h 2h 3kakstek 71 Mel 112 2 51 5161718 o bl Eli Er ehizako orf E zoo LEFT RIGHT 6 131717 Ee gg snog QI a za aw gou als e ZE Ze wl pe TS Sara bal STATOR DRIVE CIRCUIT PCB 5 gt THIS JUMPER ONLY MUST BE REMOVED 24 vac 24 voc oa dokada dade 225 Q 22 F7 1 8A e E WHEN ANY BUCKY 18 INSTALLED WAC 24 VOC ERER RE BE esas 3 So Beeg B3 LINE CONT Wou JUMPER BYPASSES ALL BUCKY CONTACTS Su file l 2 cea P ni G ON 5 T WHEN NO BUCKY IS INSTALLED 8 o M fiziziziz o BO 5 2 E g 211618 8 8 Z amp S D on 8 8 131181818138 EXTERNAL INTERLOOKS x wi OFE PWR ON SW XRT HOUSING THERMAL SWITCH TS7 1 TO TS7 5 Vi NC o c DOOR INTERLOOK SWITCH TS7 5 TO TS7 6 A 2 THERMAL SW le 7 INTERGRATED IN AUTO Mo o WARNING DANGER SHOCK HAZARD NOTE 5 ISOLATED WIRES IN BUCKY CABLE IS REQUIRED ALL JUMPERS X FUR PWR OFF SW 1 XS AND XC VOLTAGES ARE GROUND REFERENCED IF PRESENT MUST BE REMOVED FROM THE BUCKY TERMINAL STRIP 1 24VAC IS FROM AN ISOLATED WINDING AND IS FLOATING NOT GROUND REFERENCED 7 b 3 ALL OTHER VOLTAGES ARE RELATIVE TO TS2 8 WHICH IS ABOUT 12QVAC ABOVE GROUND Ke 0
13. 4 5 6 7 8 9 0 1 2 3 4 5 6 E S Mi VVVVVVVVVVVVVV V Hi BUCKY SELECTOR ci 50 HZ H12 TT TEE S H2 6 SONE CAUTION 2 S ES MERRE AUX AC NEUT 8 d 88 d BOVAC 300VAC ve H7 H3 22 2 Hi 22223822 1ss l Cle MAJ MIN VOLTAGE BU MAIN 220083 EXP CE gS on H6 EXPOSURE_PB PREP PB HE 5 6 NN NN o o ci A ADA AAAAAAAAAAAAAAAN Spe SCRs ASE avo VIE OT AUX colon e Tine Tse HOH EH LE b elll elella AMAA LAAAAT LAAAAAA AA 4 1 AAAAAAAN on No A 1123 456 cno DE 660V RER 1 lejsjajaj2 AF shlol 0 AN B gt 3 gt ae NOTE FOR 50 HZ E OPERATION REMOVE MAS DISPLAY ki ES es 1 GND CAPACITOR CD LEADS I Ke Ti S FROM 60 HZ HARNESS UNE TER A SELEC OR soit Eoy AND Msat a SWITCH i gt D ACN 3 S AC IN AUTOTRANSEORMER e STATOR DRIVE CIRCUIT PCB 28_18 0V R 5B 126V k d R FIL BOOST D FILAMENT COMM ki 8 Vi STBY ADJ MA ADJ E 8B_7 2V 6 A S GAN BOT NNNNo TOP So lt A H L 108_3 6V i 11B_1 8V 159 OHMS 283 2 S sio 12B_0 0V RB ks 3 X 4 ce 4 a 1A 280 8V 1 1151 Da 4 120VAC HIGH E IE MA SEL SW 3 RAI e d CAMA SS SHOWN FULL CCW MA SW SHOWN C AA 2214 Bech E 0 K6 A 120VAC LOW 5 5A _201 6V BISI n F LOWEST MA R FULL CCW H BUCKY J 6A_181 8V Aki S l K5 A 24VDC Ca 62e 77 6 12 5 25MA D 7 g LOWEST MA BUCKY 2 vac DRIVE BA 142 2V STS KE Saus _D_8 T ENABLE 1 9A 122 4V 9 o 9 OTT 100MA__D 9 1 10A 1026 T lee e gs 11 es 200MA D10 27 ze NA 82 8V ii 11 LEZ S00MA DT 2e t soc TE
14. Adjustment ss 21 InitialimA Calibration airiala iena alii aa alain a E 21 Space Charge Calibration cdi ana Aa E LA aka obi DS AA RE oo a dilatasyon 22 RE lee e WEE 23 SO MA Station small focal spot ol GR OA I ARE Ai 24 75 mA Station small focal spot asaniia nina 24 100 mA Station small focal Spot ss 25 200 mA Station large focal Spot nn bai kaa ske pit AS S LoL 26 300 mA Station large focal Spot comicas kdk n kan ai Ia EE ENEE 26 400 mA Station large focal spot a sia ie Die depo RA aaa n bo INI akse 26 2002 Universal 11 18 05 page iv THEORY OF OPERATION kipa vein koy deba lad eee Gatien nat it aed ove aha init 28 Turn ON sequence nie alari pal kan dega pita de ou ki ee site 28 KV Selec ii e ep AN whine arene 28 MA Selection coria nat 28 Mine Selec etario de 29 Calculation and Display of MAS its agrarie iaia alinea nent 29 KV EE EE 29 Exposure S quence eirese aera EEEE E ee Eor ETE EEE EE rali nali 30 Tube Protections siate lie inline E ky yi E las iaia ein 31 SERVIGE ADJUSTMEN TS vise ile dot ciale a a aaa dalai 32 SCHEMATIGS forli E aa aa 33 DIAGNOSIS ctr a cates Steers De E rin i pat kd a anys Steel een Me ET 34 Troubleshooting SCR Block Gates iii tent nent aria 34 Troubleshooting Main SCR Gate Drive ii 34 Troubleshooting the Backup SCR Gate Drive sise 34 Renewal Parts unici ail eil ail teli 36 PERIODIC MAINTENANCE
15. Al ess S s S 1000UF 25V 10uF 25V u 7 5 5 14 D2 ZND4 RP1 B ki 1 A RI 2 Zu to o 7 1N4001 1N4001 10k a 6 47K e ki S l C4 OPTION TRNSFMR VPP16 5 U2B TO Our di n Al eA LM339 e e e AL ies TS SOVAC TI C3 AR Tut gt 10uF 25V ls X K3 12VDC gt a a A RPI F 10k 12VDC S S 1 35 Sa 240VAC J2 e CS sa RP1 G 10k D9 EXP REL d 7 0 RIS 2 4k Boost ab 1 x Fe ai 2 104 T U3 ULN2004 fam Ls RE 24k K1 SSR J9 2 15 K1 3 Ki 2 31 12 02 hz Boost 7 BB 2 14 04 3 l 2 15 os He K1 4 _ KI 6 11 gt K4 771 16 06 ip 17 07 8 e 9 D 734 8 amv 1 5 ES lo 12VDC KG TS L sa A 12 0 luF l a q H H mo e 5 a a 6 12 Ye D D11 tap V L 1N4001 J10 A 12vDC 12VDC Lo 2 2 OUER 37 ROTOR US 4 09 12VDC RIO 100 x 3 08 A 3 1 D e e 2 07 F3 2AT 8 1 CAP AN A 2VDC a i J8 K5 Si RIG 1 v 30 5 J3 EXP HLD 8 RP1 H VREF ela R12 R13 R14 7 Gi 1 10k Un LM339 A R18 68 1 10W gt 1 10W 1 10W 5 1 t e SA 11 J6 OVAC 2 12 k L 13 il q q 1 8 0 e e 0 Us RI1 100 c8 3 1 10uF 25V S j 2 I RI7 68 y4D La ZE 12 H2VDC VCC A A E W E M L D en 3j A A R8 100k TET SCHEMATIC ROTOR CONTROL PCB 124 5076S REVISION 2 ECN 110801 11 24 08 HE425 X Ray Generator Revision D Diagnostics DIAGNOSTICS Warning Turn power OFF at main disconnect switch wall breaker before performing any of these procedures unless other
16. C 18 GA TABLE BUCKY CBL_126 5050G3_65FT 6 C 18 GA TABLE BUCKY CBL 126 5050G3 65FT 120 VAC POWER 2 CONDUCTOR CABLE SUPPLIED WITH WALLSTAND DEL MEDICAL HE425 EV650 K860 3546E MC150 034 5076S SHT 11 REVISION 1 ECN 8003 10 29 07 POWER CABLE XXXXXX TO MAIN POWER DISCONNECT
17. LREG OFF D4 sw E ZC E VS E 6 k lis VI 8 U12 A SETRAD OFF Ed a 14 5 pa CLK Q6 3 d DMA a UP DN B gt ARE Q1UF 13 F gt c A 12 ico N as 11 7 74HCT14 74HCT14 ENT p E 7AHCT11 BCDI F S O E BCD2 G gt 9 Pa e BCD4 r gt BCD8 ZERO gt D CNT VCC GND ICM7217IJI FREEZE KV DSP lt A li vec vec C18 e L LE a SFS 1 E o o mi BO vig 4 10F Go cor NEE res y B d AS ao jas B d ga 12 ue e E 1ur 3 o VPP 2 reset 021 ME k i SE TT MIB U20 we 9 U12 B N ec Lite 836 3 H S F SP SP ii 1 v 11 vec we e al 4 6 So 12 Mi 3 fo 16 Z Aa To co oe a 13 NCG Q6 4 5 J 2 RESET Q2 11 L 4 2D 20 5 Al R100 Il 9 N a 2 T 6 Az e 0 7 1 RIO2 1K Zeg H100 EI 1 as SD ER A3 EPROM ENABLED D Tomm oo GTS Eo da o gt U100 a It F 7 4024 13 ARE 14 82 SOS HICA S AND NCG Q6 6D 6Q le R103 1K N 3 LL u 17 e 16 Hs D 07 AQ A8 AGOB 70670 19 8 8 A k om AE S 8D y 80 1 40 vec kid FO mu 2 OC ke MCLR Vpp RB7 PGD sg ZTX792A o 2 gt N 74HC373 08 2 RAO ANO RB6 PGC ES Ke L oo 3 lt a TO a PAVANI RBS AN13 CCP3 7 R101 N ola n ER El E een H ST HS g U27 on RA4 RB2 ANS n 7 LEDIOO 7 a 8 RAS AN4 RB1 AN10 33 8 109 LO 2701024 ti gt Reo RBO INT AN12 w ges os lt 5 RS1 39 Y16 D va REI RD7 PSP7 1w gt gt 7 S zi Romi 19 PQQ S Se 2 RE2 RD6 PSP6 z MISD des 5 T 22 va e Do 18 PQ n oie 14 OSCURA RDS PSP5 27 um laico 12 a 4 23 17 PQ2 OSC2 RA6 RD4 PSP4 1
18. and inhibit any further exposures The generator can be reset by pressing the power off button and waiting for at least ten seconds before pressing the power on button 8 Release the PREP and EXPOSE buttons 9 Push the OFF button to turn the unit off 2002 Universal 11 18 05 page 9 HE425 X Ray Generator Revision D Pre Installation PRE INSTALLATION Space Requirements REN ben IN 58 4 CM S p IN 49 5CM gt oo CS r O 17 IN 43 2CM 48 5 IN 123 2 CM pi a 15 IN 38CM pa IN 46 4CM 9 IN 22 9CM F 125 IN 31 8CM Specifications Maximum Ratings Maximum output 400 MA 100 kVp 300 mA 125 kVp Line current at max rating 60Hz 153 amps momentary on a 240 VAC line 100 kVp 400 mA Line current at max rating 50 Hz 168 amps momentary on a 230 VAC line 100 kVp 400 mA Duty Cycle 0 5 Standby Current 3 Amps External Heat Generation 2320BTU Output P w 0 707V kvp I mA Input Power Requirements Line Voltage For Model HE425 Nominal 240 VAC 194 277 VAC 60 HZ Single Phase specified at time of purchase For Model HE425 50HZ Nominal 230 VAC 194 277 VAC 50 HZ Single Phase specified at time of purchase Environment and Conditions for Transport Storage 2002 Universal 11 18 05 page 10 HE425 X Ray Generator Revision D Pre Installation Transit Storage Temperature 40degC to 70degC Operating Temperature 10degC to 35deg
19. i ee EXP STOP 74HCT14 74HCT32 Gees ta TO 18 BT COMP TP 74HCT10 FAHCTIA 4 99K SRE ZTX692B le BEEP lt U21 B 15 ra m ASE 5 VRI VR2 US D 13 Gare 7812 12V 7805 5y 12 The go 17 VDC 4 3 1 3 p LM324 IZ Jeer 2 tea Te Ta le Ta B1 a Ao e V 4027 BRIDGE2Q0 2X2 pox f Bo woth an 2 ue SX UNUSED GATES S yt Li W e see H12 RES GTS BTS es 3 TR S o pi 12V 42A 4 1 BS B X WI NN 12BVAC 2 120vac Wl get ES oe E n CS A a 2 120VAC H hi 2 ofS 1 gt 1 a zres t OR ZA EE a8 A 74HCTB86 a Li 14V CT 12V 42A YO x AN Drs 223 9 Lu mil 2S5 5V CT STE avec 2 yae TIRE Esso Tra as BS B 74HCT32 13410 4ANCTBE DO NOT CONNECT ANY LAICA LE roads b SV 1 Ly uer duet EXT LOAD TO 3 4 5 6 4 17 VDG ve T Z 12 15 11 MRS VSS THs 13 7905 way gt TRETE 74HCT86 Il RES U13A 2 TAP A E 4 74HCT14 74HCT14 E KN DEL MEDICAL 8 8 13 12 T SCHEMATIC MAIN CONTROL BOARD 74HCT14 74HCT14 ees 124 50905 SHT 2 OF 2 ET REV 1 7 10 08 ADJ WHILE AT LOW KV SETTING ADJ WHILE AT HIGH KV SETTING CW INCREASES KV DISPLAY g
20. will not allow the Prep cycle to be initiated To clear the error you need to reset the technique kVp Digital Readout Provides a pre exposure indication of the kVp selected The display is self compensated for minor variations in the input line voltage Operating Procedure 1 Push the ON button to energize the unit If the unit does not turn on verify that the shut off switch on the wall and the main circuit breaker is on The generator and x ray tube should always be allowed to warm up for at least twenty minutes prior to its planned use to allow for proper temperature stabilization which will ensure accurate performance and prolong the life of the tube Select the desired mA station Ensure that mA is selected prior to adjusting the kVp to its final value Changing mA stations will affect the kVp indication Select the required time station and verify that the indicated mAs is equal to the product that you desire If not readjust mA and Time accordingly Select the desired kVp Depress and hold the PREP button 2002 Universal 11 18 05 page 8 HE425 X Ray Generator Revision D Operation 6 When the PREP button illuminates and you are ready to initiate an exposure depress and hold the EXPOSE button until you hear the audible beep and see the light in the EXPOSE button extinguish 7 If a mA overload condition is encountered during the exposure an internal detection circuit will immediately terminate the exposure
21. x ray room to verify compliance with specifications for the following e Incoming Line e Mains Switch e Space Requirements Unpacking Upon receipt of the equipment inspect all shipping containers for signs of damage If damage is found notify the carrier or his agent immediately When the equipment is unpacked inspect all pieces for visible damage If any damaged parts are detected repair or order replacements without delay to prevent unnecessary delay in installation Before beginning the installation verify the following All hardware is secure All internal wiring is secure Configuration is correct All items on the customer order are included in the system 2002 Universal 11 18 05 page 14 HE425 X Ray Generator Revision D Calibration H V Transformer Locate the HV transformer in its final location Open the inspection port and ensure that the dielectric oil level of the unit is approximately 1 2 from the top of the unit If necessary add Shell Diala AX oil as required Shell Diala AX does not contain any PCB s Control Locate the control close to its final location leaving some room behind it to facilitate installing necessary cabling Access to Inside of Control Remove the two screws at the bottom of the front access panel and pull the bottom forward To gain access to the top portion of the control remove the two screw alignment pin assemblies at the sides of the chassis that hold the top port
22. 0 mA KV Offset pot MA3 until the kVp meter s pre read indication matches the measured kVp output 3 Select 120 kVp Make an x ray exposure and adjust the KV Slope pot MA3 until the kVp meter s pre exposure indication matches the measured kVp output Repeat steps 1 2 and 3 until no further adjustments are necessary 4 Check final kVp meter tracking over the entire kVp range Under normal conditions the kVp meter s indication will not deviate from the measured kVp output by more than 5 kVp 2002 Universal 11 18 05 page 25 HE425 X Ray Generator Revision D Calibration 200 mA Station large focal spot 1 Select 200 mA and 50 kVp While monitoring the mA and kVp outputs compare the measured kVp to the kVp meter s pre exposure indication 2 Adjust the 200 mA KV Offset pot MA4 until the kVp meter s pre read indication matches the measured kVp output 3 Select 120 kVp Make an x ray exposure and adjust the KV Slope pot MA4 until the kVp meter s pre exposure indication matches the measured kVp output Repeat steps 1 2 and 3 until no further adjustments are necessary 4 Check final kVp meter tracking over the entire kVp range Under normal conditions the kVp meter s indication will not deviate from the measured kVp output by more than 5 kVp 300 mA Station large focal spot 1 Select 300 mA and 50 kVp While monitoring the mA and kVp outputs compare the measured kVp to the kVp meter s pre exposure indication
23. 02 Universal 11 18 05 page 2 HE425 X Ray Generator Revision D Introduction However in general all of the states adhere strictly to the established recommendations of the NCRP It is not practical to list all the relevant recommendations in this manual Therefore prior to operation be sure that all personnel who are authorized to operate the x ray system are familiar with the established regulations of the authorities named above Also they should be monitored to assure that they conform to the recommendations Current sources of information include e National Council on Radiation Protection Report No 33 Medical X ray and Gamma Ray Protection for Energies up to 1 0 MEV Equipment Design and Use National Bureau of Standards Handbook no 76 Medical X Ray Protection up to Three Million Volts Refer to NCRP Report No 33 e Current recommendations of the International Committee on Radiation Protection Although x ray radiation is hazardous x ray equipment does not pose any danger when it is properly used Be certain that all service and operating personnel be properly informed on the hazards of radiation Also those responsible for the system must understand the safety requirements for x ray operation Study this manual and the manuals for each component in the system to become aware of all the safety and operational requirements Maximum Permissible Dose MPD Various studies of the effects of x ray radiation have provide
24. 1st MA bi SCHEMATIC MAIN CONTROL BOARD H11 7 TO H11 2 2nd MA H11 7 TO H11 3 3rd MA 124 50905 SHT 1 OF 2 H11 7 TO H11 4 4th MA REV 1 7 10 08 H11 7 TO H11 5 5th MA H11 7 TO H11 6 6th MA COMPD KV ALT ZCO ALT ZCO VEC WC 11 e MA 2 43 eie EES Te 249K A 12V 2 2 e 15 vec 5 vec
25. 3 3 24 Va Be 16 PQS z U15 B 74HCT14 XRTT 35 012 i 5 RCO RC7 RX DT 2 1 INI oun s 27 4 2 25 Jan pa 18 PAW i U16 B XRT2 36 A13 D13 A PO na RCS TX CK IN2 our 15 1 26 14 PE YO TA R62 EPROM ENABLED At4 D14 LIMIT se 24 3 16 m 6 MF Es AS D5 d 3 4 1 2 37 ai a Re RCSISDO rs TN ours Tas D 5 ME 16 W 5 KM TA A ais D15 gt rasa RC4 SDI SDA M om Lo e 7 WW 4 H E 20 1 RDO PSPO RD3 PSP3 INS OUTS a a8 74HCT32 74HCT14 C31 A CE VPP 20 souen org LZ 6 we ours H2 D 2 O 30 11 7 12 15 2 MB 47uF p ED END 1 00 gy N SUI Ce 16 1 MA 5 MA m 8 E IN ours S DISPLAY yy d 2 v re OS 10 147 amp X RT L M TS PIC16F777 a ce T x ULN2803 D JP1 VCC XRTO 1 2 as KI k le kY k LI KQ e A xR 312 Sag pos SI Sal 8 9 ras 1 1 XRI2 5 17 Se f pos 1 5 o 4 os 5 E le lt 1 posg o 5 D D T El gt 3 x EXP TIMER S Lo Ss Lo Ss Pons amp XRT SEL JMP a ja Ja a jala fle Y 8 Y S A220 VALUES vr tf Y A Le YS H101 an BIN NS Toshiba E7239 182mm pos 0 TD o b o RX D alelslala l l D a 2Toshiba E7242 6 amp 1 5mm pos 1 ee RAD 13 1 amp 2mm pos 2 chi VVVVVVVI un RAD 8 1 amp 2mm pos 76 1 6 Hz or 50Hz rating contained in EPROMs U25 U27 Exchange in 6 Hz or 5 Hz pairs only U25 U27 may be interchanged TO 10 BIT COMP gt MA SEL SWITCH TO H11 header NOTES DEL MEDICAL NO MA SELECTION E EXP HOLD o H11 7 TO H11 1
26. 3 T4 165 101 00 Line contactor 3PDT 30A 161 100 08 SCR Block SCR 1 or SCR2 173 101 01 Capacitor 20 30 MFD 300 V for stator 3481 0417 Adjustable resistor 50 Ohms 175 W RXL 3481 0195 Adjustable resistor 100 Ohms 175 W RXS 3481 0197 Adjustable resistor 25 Ohms 175 W RSC 3481 0194 Adjustable resistor 150 Ohms RB 469 101 03 Relay 12 VDC MA Overload Sense 645 5017 Relay 120 VAC MA overload Lockout 645 5018 Relay 120 VAC Bucky enable K5 645 5018 Relay 24 VDC Bucky drive K6 645 5019 Relay 24 VAC Prep K7 645 5016 Bridger Rectifier BR1 or BR2 173 101 00 Cap Switch ON or OFF Black 161 100 02 Cap Switch lens PREP Green 161 100 04 Cap Switch Lens Expose Red 161 100 05 Cable Assy Time Select Switch 126 5169G1 Cable Assy MA Switch 126 5270G1 Assy Autotransformer 636 5026 HT Transformer Assy 402 501 01 2002 Universal 11 18 05 page 36 HE425 X Ray Generator Revision D Periodic Maintenance PERIODIC MAINTENANCE Preventative Maintenance Preventive maintenance inspections should be performed on a semi annual basis and should include the following e Inspect all electrical wires and cables for abrasions cuts or cracks e Inspect all control buttons and knobs to ensure that they are secured properly and accurately e Inspect all labels and indicators on the operator s control panel to ensure legibility and accurate alignment e Confirm mA kVp and timer accuracy and adjust as ne
27. Anode Bottom View K A A External Gas Filled K K Cathode Spark Arrester li 90 Volts Nominal Bottom View ci MI 9 Small FS XFMR XS 1 0Vrms to 13 Vrms nominal load Ratio Large FS XFMR 1 0Vrms to 13 Vrms nominal load Ratio SCHEMATIC HT TRANSFORMER ASSY 3560 482 501 015 REV 2 10 7 04 12VDC 12VDC VREF HPVDC A A DI PI Re 12VDC A 100 12VDC A ane DI DI FI aa e R3 470K 62mA T di R20 e R19 A T 1N4001 1N4001 LM7812C T0220 47K 47K D6 6 12 1 3 1N4001 ji a ue e IN OUT HH Ge A al po a n R4 100K 12VDC VREF a _ 1N4001 12VDC RPI D RPI E KI A A 120VAC amp o ZN A 10k 10k S 4 o o 10 a al VREF e ake Rel uec GND E li CI ai 5 RP1 C A n a 4 l 47K LM339 ki a GE gi e a 10K
28. C Relative Humidity 10 100 Atmospheric pressure 500hPa to1060hPa Apparent Resistance of Supply Mains 0 09 Ohm Line Regulation The 240 VAC power line typically a 100 amp service must have a regulation of lt 5 when operated at a momentary load of 140 amps Required Wire Size The following Table lists the wire size for various distances from the power disconnect near the control to the main distribution panel LINE VOLTAGE WIRE SIZE FOR THE FOLLOWING DISTANCES 0 50 50 100 100 200 240 VAC Single Phase 2 00 250 mcm 208 VAC Single Phase 2 00 250 mcm Circuit Protection Mains National and local electrical codes require installation of a disconnecting switch or circuit breaker rated for at least 50 of the input current required for the maximum momentary rating of the unit which must be placed in a location readily accessible from the x ray control A common disconnect switch box is a 100 amp surface mounted safety disconnect switch It is required that UL listed current limiting current 50A 250V time delayed fuses or double pole circuit breaker be provided for both lines of Generator power Accuracy Statements The following statements assume kVp is measured with an invasive bleeder tank such as a Dynalyzer with an oscilloscope to view the actual kv peaks time is measured with a similar device as kVp to allow the counting of the actual pulses and that mA is mea
29. OTs acs sex C52 B So r a e B too gt a i Yo loza lt Jup ve SY c7 E 1 e a iacha RSS gt D sy USA Sis D EE z1x792 MAIN SCR GATE DRIVE SS a Me m i cui S AE R32 ag R31 10 0 es H3 Nelo e i MAIN SCRs FROM PCB PWR XFMR T2 Q4 c 37 Qs le 7 J4HCT10 L il 7 E 1 2 B C 1 2 a met RSS 2 Bf 8 B U32 C 3 Bb ok 4 99K 638 ZTX692B R34 10 0 s2 2 1S SCR2B if ke y L k Us i U32 D 2k api A VR E 415 scr2c 4 99K A x ac 74HCTO8 5 1 Pi A Ju 4 Jeer li C9 47uF 53 415 scr2o ol ue mao E SAB E D gt B Piga 32 ODE 278928 5 ZTX692B 249K RR 4027 Ok s4 des ho Zoch SE E ACT Soa AMENA JUMP JP6 TO JP5 FOR 12VDC 412V L o Le E ZTX692B OR L i JUMP JP6 TO JP4 FOR 5VDC 1 SEE AUX DEVICE REQUIREMENTS Ed E Wo SC YCC 499k ae Gg 9 DE VCC 12V H6 Zon A 1 HeH os 2 015 499K 7rx7g2 l GE CLK _ PNP H gt soi ee EH Wo ATUF L pt 4 99K B Bati COMPD SE it Bay ros LED2 RST EXP DUR SI AUX A7UF T De EXP REL o 4027 ZTX692B e ALT ZCO ots B PWR ON DELAY CA 1 RA NEN p AE A Li RE TA 499k USF R47 Ej 13 Be 1 24 ps S 49 9K gt lt FREEZE KV DSP 74HCT14 Tr BU SCR GATE DRIVE si 4 gt H16 1 gt EPROM ENABLED D p R51 D11 D L K1 B KIA a 2 ok A H7 BU SCRs vec POD ken 13 DN BU K 1 1 STO T U6 B A VEC no a 1N4004 tava a ees 2 HA 4 kid EXP 4 213 SH 6 ae Le 25 S EAP REL H z SERIE x e haa dit Be 5 p So Bi Bo 12V D12 BU AK 4 445 scrip
30. TOR CABLE SUPPLIED WITH X RAY TUBE ROTOR CONTROL BOARD K860 FLOOR CEILING MOUNTED TUBESTAND A0 HSID I2 HSID WALL STAND 3546E TS7 2 THERMSW 1 THERMSW 24VDC POWER SUPPLY CABLE SUPPLIED WITH K860 14 X 17 GRID CABINET TB3 ZAVAC ZAVAC 24VAC RTN 24VAC RTN 24VDC 24VDC 24VDC 24VDC CONSOLE GRN YEL GRN YEL TB3 10 TABLE B8 11 wALL B8 12 120VAC 13 TABLE B4 14 WALL_B4 15 TABLE B3 16 WALL B3 17 TABLE B2 18 WALL B2 19 TABLE BI 20 WALL B1 COLLIMATOR HEAD COLLIMATOR CABLE SUPPLIED WITH COLLIMATOR NOTES WHEN CONNECT BUCKY REMOVE JUMPER BETWEEN TB4 18 AND TB4 19 ELEVATING TABLE EST UL EV 650 LX Sala va suo Pell SEE isles TER NANA Proc Bucer OPTIONAL DERE COLLIM DIFF TUBECRANE SID POT DIF SID POT D 122 507661 122 504261 z zl zen L a See Sos Ga 3 le 3 3 o ala Szia e a Ze 3 3 EE YA ela san kai Z LITISIL SEE sak MERE Eee PA N NZ NZ IY VV oi one SA Selel i Vy PKR PINS SESE lol SEZI NA BRN RED WHT BLU GRN YEL GRN YEL BRN BLU 6
31. a jumper in place to allow operation without a Bucky If a Bucky is to be used remove the jumper between TS3 18 and TS3 19 and connect the Bucky as follows BUCKY CONNECTIONS HE425 Control Progeny Midwest Liebel Bucky Function Table Wall Bucky Sie older models Bucky Exp 3 i Contacts 2 7 BI 1 B1 24 VAC Bucky Exp 3 Contacts cp ere B2 2 B2 24 VAC GE TS3 15 TS3 16 a BS 115 VAC TB3 WB3 Bucky Drive TS3 13 TS3 14 Return TB3 WB4 Ba aa 115 VAC Bucky TS3 10 TS3 11 Home B8 L B8 115 VAC TB8 WB8 2002 Universal 11 18 05 page 16 HE425 X Ray Generator Revision D Calibration Incoming Line Cable Connection WARNING Ensure that the main power safety disconnect is OFF prior to connecting or disconnecting the line cable Measure the incoming line voltage at the disconnect switch wall panel before connecting the power cable part 3480 0141 that will go to the console Connect the wires from the incoming line cable marked L1 and L2 to terminals 1 and 2 of TS5 Connect the GROUND lead from the same cable to the CHASSIS GROUND lug located on the bottom panel of the control console near TS5 Line Voltage Adjustments Terminals on TS1 and TS2 are provided for coarse and fine adjustments of the incoming line voltage Measure the line voltage at the disconnect switch and relocate wires marked ALVF and ALVC according t
32. acturer its agents and representatives do not accept any responsibility for over exposure of patients or personnel to x ray radiation Furthermore the manufacturer does not accept any responsibility for overexposure of patients or personnel to x ray radiation generated by this equipment which is a result of poor operating techniques or procedures Also no responsibility will be assumed for any machine that has not been serviced and maintained in accordance with the system technical manual or which has been modified or tampered with in any way Radiation Protection Because exposure to x ray radiation may be damaging to health use great care to provide protection against exposure to the primary beam Some of the effects of x ray radiation are cumulative and may extend over a period of months or years The best safety rule for x ray operators is Avoid exposure to the primary beam at all times Any object in the path of the primary beam produces secondary scattered radiation The intensity of the secondary radiation is dependent upon the energy and intensity of the primary beam and on the atomic number for the for the objector material struck by the primary beam Secondary radiation may be of greater intensity than that of the radiation reaching the film Take protective measures to safeguard against it An effective protective measure is the use of lead shielding To minimize dangerous exposure use such items as movable lead screens l
33. at low kVp levels for the corresponding mA station This is commonly referred to as space charge compensation Normal tracking of mA over the entire range of kVp will result in mA values slightly higher than selected near 80 kVp and mA values slightly lower than selected levels at the high and low ends of the kVp range 125 and 50 See chart below ZERO COMPENSATION POINT SHOULD SLIGHTLY EXCEED DESIRED MA lt a LJ a Dei a LJ A 80 KV TYPICAL 1 Select the 50 mA station 80 kVp and 0 1 second 2 Select 50 kVp and note the mA produced 2002 Universal 11 18 05 page 22 HE425 X Ray Generator Revision D Calibration 3 Select 120 kVp and note the mA produced 4 If the mA produced at 120 kVp is higher than the mA produced at 50kVp move the respective band of RSC to the right If lower move the band to the left 5 Repeat steps 1 through 4 until no further adjustments are necessary 6 Check mA tracking from 50 to 120 kVp and fine tune as required The unit must track within 10 of the selected MA value 7 Repeat steps 1 through 6 for the remaining mA stations kVp Calibration The control has an adjustable kVp Meter Compensation Circuit that adjusts the displayed value of the kVp meter to compensate for the loading effects of different mA selections This circuit consists of two separate offset and slope potentiometer adjustments for each mA station for a total of twe
34. ce charge compensation voltage At this time the value of the indicated kVp is not important e Set the kVp Major and Minor switches fully counter clockwise e Rotate the kVp Major switch six audible clicks clockwise e You may now calibrate each of the mA stations for its indicated value 50 75 100 200 300 and 400 mA at this kVp setting by adjusting the respective bands on resistors RXL and RLS The leads connected to the 2002 Universal 11 18 05 page 21 HE425 X Ray Generator Revision D Calibration bands of these resistors are marked with numbers which correspond to the mA stations Moving any one of these bands to the right increases the mA for the corresponding mA station e Select atime setting of 0 1 second If you are using an mA meter select a longer time such as 1 second to allow the meter reading to stabilize properly e Make a series of exposures at each of the available mA stations and adjust resistor RXL or RXS as necessary to obtain the desired mA e When all of the mA stations have been calibrated for their proper base value you may continue with the space charge calibration procedure Space Charge Calibration Space charge compensation for all mA stations is adjusted with resistor RSC The leads connected to the bands of RSC are also marked with numbers which correspond to the same mA stations Moving any one of these bands to the right causes a decrease of mA at high kVp levels and an increase of mA
35. cessary Cleaning Instruction Cleaning of the HE425 Generator must be done with a non abrasive hospital grade cleaner 2002 Universal 11 18 05 page 37
36. d a foundation for establishing the maximum permissible does MPD of x ray radiation The results of these studies have been used by the NCRP and the ICEP to develop recommendations for MPD ICRP recommends that the MPD to the most critical organs heart lungs liver kidney brain etc accumulated at any age shall not exceed five rems multiplied by the number of years beyond 18 MPD 5 X N 18 rems where N age in years However in no case shall the exposure exceed three 3 rems in any period of 13 consecutive weeks For hands forearms feet and ankles the recommended MPD is 75 rems in any one year Manufacturer s Responsibility Although this equipment incorporates protection against x ray radiation other than the useful beam practical design cannot provide complete protection Equipment design does not compel the operator or his assistants to take adequate precautions Nor does it prevent the possibility of improper use which 2002 Universal 11 18 05 page 3 HE425 X Ray Generator Revision D Introduction may result in authorized or unauthorized persons carelessly unwisely or unknowingly exposing themselves or others to direct or secondary radiation Allow only authorized properly trained personnel to operate this equipment Be certain that all personnel authorized to use the equipment are aware of the danger of excessive exposure to x ray radiation This equipment is sold with the understanding that the manuf
37. ding Information The figure below shows a typical interconnected x ray system It is comprised of 1 2 6 7 Tube Stand Collimator X Ray Tube Float Top Table Wall Grand X Ray Generator Collimator Power Supply All of these components are grounded to a common bus according to national and local electrical codes Also all of the components should comply with UL 60601 Standards Buss Ground 2002 Universal 11 18 05 page 6 HE425 X Ray Generator Revision D Operation OPERATION Control Panel Controls amp Functions 1 ON Button Pushing this button will turn the unit ON 2 OFF Button Pushing this button will turn the unit OFF 3 BUCKY Switch Selecting Table or Wall will allow the respective optional Bucky to energize when an exposure is initiated Selecting Off will inhibit either Bucky from energizing when an exposure is initiated 4 Minor kVp This rotary switch selects kVp in 1 2 kVp increments and is used in conjunction with the Major kVp switch to select the desired kVp 5 Major kVp This rotary switch selects kVp in approximately 10 kVp increments and is used in conjunction with the Minor kVp switch to select the desired kVp 6 mA Selector This rotary switch selects the desired mA level with the corresponding small or large focal spot S after the number indicates small focal spot and L indicates large focal spot 7 Time Selector This rotary s
38. ead impregnated gloves and lead impregnated aprons While servicing or operating x ray equipment do not expose hands wrists arms or other parts of the body to the primary beam Monitoring of Personnel Monitoring of personnel to determine the amount of radiation to which they have been exposed provides a valuable cross check to determine whether or not safety measures are adequate lt may reveal inadequate or improper radiation protection practices and potentially serious radiation exposure situations 2002 Universal 11 18 05 page 4 HE425 X Ray Generator Revision D Introduction The most effective method of determining whether or not the existing protective measures are adequate is the use of instruments to measure the exposure in RADS This measurement should be taken at all locations where the operator or any portion of his body may be during exposure Exposure must never exceed the accepted tolerable dose A common method of determining whether personnel have been exposed to excessive radiation is the use of film badges These are x ray sensitive film enclosed in a badge which incorporates metal filters of varying degrees of transparency to x ray radiation Even though this device only measures the radiation which reaches the area of the body on which it is worn it does furnish an indication of the amount of radiation received 2002 Universal 11 18 05 page 5 HE425 X Ray Generator Revision D Introduction Groun
39. et pot MA1 until the kVp meter s pre read indication matches the measured kVp output 3 Select 120 kVp Make an x ray exposure and adjust the KV Slope pot MA1 until the kVp meter s pre exposure indication matches the measured kVp output Repeat steps 1 2 and 3 until no further adjustments are necessary 4 Check final kVp meter tracking over the entire kVp range Under normal conditions the kVp meter s indication will not deviate from the measured kVp output by more than 5 kVp 75 mA Station small focal spot 1 Select 75 mA and 50 kVp While monitoring the mA and kVp outputs compare the measured kVp to the kVp meter s pre exposure indication 2 Adjust the 75 mA KV Offset pot MA2 until the kVp meter s pre read indication matches the measured kVp output 3 Select 120 kVp Make an x ray exposure and adjust the KV Slope pot MA2 until the kVp meters pre exposure indication matches the measured kVp output Repeat steps 1 2 and 3 until no further adjustments are necessary 2002 Universal 11 18 05 page 24 HE425 X Ray Generator Revision D Calibration 4 Check final kVp meter tracking over the entire kVp range Under normal conditions the kVp meter s indication will not deviate from the measured kVp output by more than 5 kVp 100 mA Station small focal spot 1 Select 100 mA and 50 kVp While monitoring mA and kVp output compare the measured kVp to the kVp meter s pre exposure indication 2 Adjust the 10
40. his voltage activates the Bucky drive relay which energizes the appropriate Bucky and the 24 VDC signal is then sent through the B1 and B2 contact closures of that Bucky to connector H4 On the main control board the 24 VDC signal activates opto coupler OC2 which sends a signal through several gates of U32 setting the exposure latch of U21 to the active state and passing the exposure release signal along through U7 B This signal activates command to freeze the kVp display during the exposure as well as enabling the 120 Hz pulse train at U8 A which is divided to 60 Hz at U8 A and used to clock U28 a binary counter that feeds its outputs to a set of binary comparators U24 26 and 30 which compare the desired time against the elapsed time of the exposure and terminate the exposure by resetting the exposure latch The same pulse train from U8 A also provides pulses through a network of transistors Q1 2 3 which provide pulses to the gates of the main SCR block The exposure release signal also activates the audible alert and the BU SCR gate drive relay K1 B which arms the BU SCR for the exposure When counter U28 reaches the desired number of counts the binary comparators are satisfied and a signal is released to terminate the exposure by resetting the exposure latch The generator is capable of beginning another 2002 Universal 11 18 05 page 30 HE425 X Ray Generator Revision D Theory of Operation exposure by releas
41. ing and pressing the exposure switch again after an exposure has timed out properly as long as the PREP switch has not been released Additionally there is a voltage detection circuit opto coupler OC1 on the main control board which senses the presence of line voltage across the BU SCR which would indicate a failure of the main SCR This circuit will produce a signal which can also hold the reset of the exposure latch disabling the initiation of any exposures and lighting LED 4 the SCR FAIL LED Tube Protection EPROM U25 is also used to implement the tube protection profile of the selected x ray tube by looking up the profile from a series of addressable lookup tables in its memory Address information for time mAs and kVp are fed into this EPROM along with address information from the jumpers at JP1 which are used to identify the tube type in use If the selected technique is beyond the range of the tube protection profile the LIMIT bit from pin 3 of U25 will be activated which will inhibit any exposures until a proper technique has been selected Additionally this EPROM will generate the error message E which will be displayed in the mAs display until the technique is within the appropriate limits for the tube 2002 Universal 11 18 05 page 31 HE425 X Ray Generator Revision D Service Adjustments SERVICE ADJUSTMENTS The field service engineer is responsible for the preventative maintenance of the unit U
42. ion of the access panel in place Swing the upper portion of the control upwards H V Transformer Connections The two control transformer cables for the H V primary and the auxiliary transformer are pre wired to the control at the factory Connect the cables to the H V transformer according to the respective markings of each wire Caution The terminal pins on the high voltage connectors are extremely delicate and can easily be damaged Ensure that they are straight and that the split ends of the pins are slightly open Use a thin metal blade to open them slightly if necessary Clean the HV terminals carefully using a clean lint free cloth and a light solvent such as alcohol before applying the vapor proofing compound Use a clean non conducting applicator to coat each cable plug with vapor proofing compound Apply a one half inch high cone of the compound to the end of each insulator before inserting it into the high voltage socket You may also apply a small amount of the compound to the threads of the connector socket of the strain relief flange to facilitate easier threading of the hardware Collimator Power For 24 VAC collimator power connect the collimator power cable to TS3 1 and TS3 3 2002 Universal 11 18 05 page 15 HE425 X Ray Generator Revision D Calibration Magnetic Lock Power For 24 VDC lock power connect lock supply cable to TS3 5 and TS3 7 Bucky Connections The control is shipped with
43. lve pots on the board These adjustment pots are located on the KV Adjust PCB which is mounted above the Main Control PCB in the top section of the control beneath the control panel lid The first group of potentiometers on the left side of the board are the Offset adjustments and the second group of potentiometers on the right side are the Slope adjustments The pots are labeled MA1 thru MA6 on both sides of the board which correspond to 50 mA 75 mA 100 mA 200 mA 300mA and 400 MA respectively The Offset adjustment raises or lowers the reading of the kVp meter the same amount at all points of the kVp range for the selected mA station See illustration below The Slope adjustment changes the reading of the kVp meter a greater amount at the higher kVp settings than at the lower kVp settings for the same respective mA station See illustration below 2002 Universal 11 18 05 page 23 HE425 X Ray Generator Revision D Calibration KV DISPLAY KV DISPLAY PRIMARY VOLTS N L PRIMARY VOLTS N L NOTE In order to accurately compare the actual measured kVp of an exposure to the indicated kVp on the display the tube current must first be accurately calibrated Failure to do so will result in inaccurate kVp 50 mA Station small focal spot 1 Select 50 mA and 50 kVp While monitoring the mA and kVp outputs compare the measured kVp to the kVp meter s pre exposure indication 2 Adjust the 50 mA KV Offs
44. m Lbs pounds R degree Fahrenheit 9 degree Celsius percent hPa Hecto Pascal UL Underwriters Laboratories CE Communaut s Europ ennes INTRODUCTION Use of this Manual Throughout the manual there are Note Caution and Warning statements which contain information to assist the user of this manual The information may direct the user in the performance of a task or it may inform the user of a potentially hazardous situation Each alert word is always used with only one specific type of information The types of information contained in the statements are as follows NOTE Information which assists the user of the manual in the performance of a task lt may provide the user with better methods of conducting the task or it may point out conditions which could cause the system to fail to operate properly CAUTION Information which alerts the user of the manual to situations that could result in damage to the equipment WARNING Information which alerts the user of the manual to situations which could be hazardous to the health of the patient the operator the maintenance person or others Safety It is vitally important that everyone associated with x ray work is familiar with the recommendations of the Department of Health National Bureau of Standards and the National Council on Radiation Protection The control of diagnostic medical x ray equipment varies in detail from state to state 20
45. n RAD 8 1 X 2 mm Installed Verify that jumper J8 on rotor control board are set for the type of X ray tube you are using according to Table and Figure on below X Ray Housing Type Position of jumper J8 Varian RAD 8 1 X 2 mm Middle and lower 2 in Figure below Varian RAD 13 1 X 2 mm Middle and lower 2 in Figure below Toshiba E7239 1 X 2 mm Upper and middle 1 in Figure below Toshiba E7242 0 6 X 1 5 mm Upper and middle 1 in Figure below 2002 Universal 11 18 05 page 19 HE425 X Ray Generator Revision D Calibration Rotor Cable Connections The wires of the rotor cable are labeled T5 T6 MAIN PHASE amp COM Connect them as shown below MAIN PHASE com T5 T6 CALIBRATION To ensure accuracy always allow the generator to warm up for at least twenty minutes prior to performing these calibration procedures If the unit is turned off and allowed to cool at any point in the process of calibration it must be warmed up again before proceeding WARNING Exercise extreme caution with regard to the temperature of the x ray tube during the calibration procedures You must allow sufficient time for the anode of the tube to cool between exposures in order to prevent permanent damage to the x ray tube Refer to the cooling charts for the anode and tube housing in the documentation that accompanied your x ray tube The installer should read and understand
46. nder normal circumstances these procedures will have already been covered in the Calibration and Periodic Maintenance chapters of this manual Additional information for the theory of operation and troubleshooting of this generator may be found in the Theory and Diagnostics chapters of this manual Information related to the identification of replacement parts for this generator may be found in the Renewal Parts chapter of this manual 2002 Universal 11 18 05 page 32 HE425 X Ray Generator Revision D Schematics SCHEMATICS Drawing number Description Sheets Current Rev 034 5076 Interconnect diagrams for HE425 2 See Config generator and various Tube Wallstands table below 120 5022 Overall Control Wiring Diagram 1 1 124 5090 Schematic Main Control PCB 2 1 482 101 06S Schematic KV Adjust PCB 1 2 482 501 01S Schematic HT Transformer Assy 3560 1 2 124 5076S Schematic Rotor Control PCB 1 2 Configuration Schematic Match Table Tubestand Collimator Wallstand Refer to Current Model Model Table Model Drawing Rev FMTS Tubestand MC Series RT100 3546E 034 5076S7 2 K860 Floor Ceiling MC Series 3546E 034 5076S11 1 Mounted Tubestand 2002 Universal 11 18 05 page 33 H V TANK H V CABLE K 3375 60 H V CABLE K 3375 60 HE425 GENERATOR ANODE CATHODE FILAMENT CABLE 463 101 00 ROTOR CABLE SUPPLIED WITH X RAY TUBE ROTOR CONTROL BOARD TS7 2 THERMSW 1 THERMSW
47. nto a common bus to a seven segment display driver U22 Each of these latches holds one of the three digits that will be sent to the mAs display and they are enabled sequentially in time with the selection of the individual numbers on the front panel of the display kVp Display The voltage that has been selected using the kV Major and Minor switches is fused in the lower portion of the cabinet and then sent to the main control board at connector H2 Caution This sample voltage may range between 80 to 300 VAC depending upon the value of kVp that has been selected Although this voltage has been fused for safety the field service engineer should be aware of the potential hazards for shock and component damage Use appropriate care when inspecting this portion of the board while the unit is energized This voltage is stepped down at T3 and then it is scaled and rectified at U2 before being sent to the KV Adjust board where it is compensated for the selected mA using selected potentiometers to attenuate the signal and provide the desired amount of DC offset to compensate for voltage drop under load The compensated kV signal is then fed to a voltage to frequency converter U4 which converts the analog voltage to a pulse train which varies between approximately 3 to 5 KHz depending on the selected kV This pulse train is fed to U14 which is clocked at 6 Hz by U9 This clocking action reads out the stored 2002 Universal
48. o the following chart Line ALVC ALVF Voltage 194 TS1 5 TS2 6 198 TS1 5 TS2 7 202 TS1 5 TS2 8 207 TS1 4 TS2 4 211 TS1 4 TS2 5 214 TS1 4 TS2 6 218 TS1 4 TS2 7 221 TS1 4 TS2 8 223 TS1 3 TS2 3 227 TS1 3 TS2 4 230 TS1 3 TS2 5 234 TS1 3 TS2 6 238 TS1 3 TS2 7 241 TS1 3 TS2 8 243 TS1 2 TS2 3 247 TS1 2 TS2 4 250 TS1 2 TS2 5 277 TS1 1 TS2 7 Refer to schematic 120 5022 for additional details regarding voltage configuration of the autoformer 2002 Universal 11 18 05 page 17 HE425 X Ray Generator Revision D Calibration Ensure that the incoming line voltage adjustment for the autotransformer is correct and that all connections are tightly secured before connecting the incoming line cable to the safety disconnect switch on the wall All of the components used with the generator X ray tube collimator genrator etc must comply with UL 60601 Standards 2002 Universal 11 18 05 page 18 HE425 X Ray Generator Revision D Calibration Tube Selection The HE425 generator is compatible with 4 different x ray tubes To ensure that the proper tube protection profile for your tube has been selected refer to the chart below and install jumpers in JP1 on the main control board as indicated X RAY TUBE Position Position Position 2 0 1 Toshiba E7239 1 X 2 mm installed Toshiba E7242 0 6 X 1 5 mm installed Varian RAD 13 1 X 2 mm Installed Varia
49. routed to the space charge transformer T3 The outputs from KV Minor tape switch is sent to the main control board where it is scaled and rectified and used to provide the raw drive for the kVp display after being processed through the kV adjust board and the main control board mA Selection A three deck six position switch on the operator s console is used to manually select the tapped voltages from the space charge resistor and resistors RXL and RXS to provide voltage for the primary of the filament drive transformers in the high tension tank The third deck of this switch is used to provide selection data to the main control board through connector H11 This data is used to select 2002 Universal 11 18 05 page 28 HE425 X Ray Generator Revision D Theory of Operation offset and slope compensation from pots on the kV Adjust Board and as addressing information for mAs calculations Time Selection 23 available time stations may be selected using the Time Selector switch on the front panel of the operator s control The output from this switch is a five bit binary encoded word which is used to provide addressing information to U27 to decode the actual exposure time and to U25 to be used for mAs calculations Calculation and Display of mAs Address data from the time selection and mA switches is used by U25 to lookup values of mAs which are then output to a group of selectable latches U23 A B and U29 A which feed i
50. sured by an invasive average sensing mA meter placed in the center leg of the high voltage secondary kVp kVp Range 40 to 125 kVp Resolution 1 to 2 kV in steps Accuracy 10 of indicated value 2002 Universal 11 18 05 page 11 HE425 X Ray Generator Revision D Pre Installation mA Selections Small Spot 50 75 100 mA Large Spot 200 300 400 mA Accuracy 15 Time Selections 23 selections between 1 120 second to 6 Seconds Accuracy 1 120th second through 1 2 second and 1 60 second above 1 2 second Compatibility This 402 100 00 control is only compatible with the 402 501 00 high voltage generator This unit is compatible with the following x ray tubes Toshiba E7239 1X2mm Toshiba E7242 0 6X1 5mm Varian RAD 8 1X2mm Varian RAD 13 1X2mm Bucky Compatibility Maximum Number of Buckys 2 Control Type 120 VAC Aux Power Output Locks 24 VDC fused at 2 Amps Collimator 24 VAC fused at 8 Amps 2002 Universal 11 18 05 page 12 HE425 X Ray Generator Revision D Installation 2002 Universal 11 18 05 page 13 HE425 X Ray Generator Revision D Calibration INSTALLATION Warning The instructions in this manual are intended for qualified personnel only Test Equipment e Digital VOM e Dynalyzer with trigger level set at 90 or HV voltage divider tank e Storage Oscilloscope e mAs Meter Preliminary Site Inspection Before beginning installation inspect the
51. t CW INCREASES KV DISPLAY SS 2 1 00K R24 1 00K R23 P 1 A Ein REV i ea A ARR 1 500K P12 2 A 5 1 20K R20 1 00K R19 10 0 26 2 y PS 3 2180 RS AD AAA A ANANA BA INM INM a aaa D 500KT PIQ H1 2 100k R16 1 00K R15 10 0 R10 2K PS 10 0 Go A 2 11 ee e a2 2 111 3 2 1 A E FIN y a ta 3 4 l gt i 500K P8 KEE 2 R12 1 00K R11 7 8 me RIZ A 4 ne 11 Fe 2 9 a 10 A R14 1 2 3 AN AN A Z Va MIL a 11 d h A SE 500K P6 13 14 2 pk RB 120K R7 10 8 R18 2K y P9 10 0 R17 A 2 wvm ie190 2x7_ ANA 5 500KT P4 2 1 00K R4 1 00K RZ 10 0 R22 2k E 10 0 R21 A TISANA 1 2 1 3 2 1 A 6 5 K 7 P2 DU KV DSP U VOLTS N L THE INFORMATION CONTAINED HEREIN IS CONFIDENTIAL AND PROPRIETARY INFORMATION OF DEL GLOBAL TECHNOLOGIES CORP ITS SUBSIDIARIES AND AFFILIATES DEL AND IS A TRADE SECRET OF DEL WHICH SHALL NOT BE DISCLOSED TO ANY THIRD PARTY OR COPIED WITHOUT THE EXPRESS PRIOR WRITTEN CONSENT OF DEL THIS CONFIDENTIAL AND PROPRIETARY INFORMATION IS TO BE USED ONLY FOR THE SOLE PURPOSE AGREED TO BY DEL ALL CONFIDENTIAL AND PROPRIETARY INFORMATION MUST BE RETURNED TO DEL PROMPTLY UPON DEL S REQUEST SCESO KV DSP U RI VOLTS N L SCH EMATIC 132 101 065 EN 2 KV ADJUST PC HT XFMR 1 0Vrms to 0 57KVpeak no load Ratio p2 E E GND lt a
52. the information provided with the x ray tube prior to making any x ray exposures 2002 Universal 11 18 05 page 20 HE425 X Ray Generator Revision D Calibration It is recommended that the measuring equipment connected to the x ray system should be used to monitor mA and kVp throughout the entire calibration procedure to reduce the chances of misleading test results mA Calibration Connect a Dynalyzer or a mA meter to perform the following procedure If no Dynalyzer is available mA may also be measured by removing the jumper between the MA and MA terminals 5 and 6 of TS4 and connecting a DC mA meter between those terminals Caution Be sure to replace this jumper after removing the mA meter when calibration has been completed Standby Filament Current Adjustment Measure the filament secondary current during standby with a Dynalyzer and verify that the filament secondary current is in the range of 3 0 3 2 amps RMS If required adjust the slider band on resistor RB If no Dynalyzer is available the field engineer may adjust the filament by eye adjusting resistor RB so that a dull glow just begins to show on the selected filament Initial mA Calibration You must first set the kV Major and Minor switches in a position that produces no voltage across the space charge transformer This will allow the engineer to calibrate the base value all of the individual mA settings with no additional effect from the spa
53. um Permissible Dose MP 3 Manufacturer s Responsibility sis 3 Radiation Protection csi e gia ie 4 Monitoring of Personnel sise 4 OPERATION san lea a 7 Control Panel Controls amp Functions sisi 7 Operating Procedure aaa aaa anka cc 8 dE EE E a ele DEE 10 Space Requirements A 10 SPECICATION tutor ia ii 10 Maximum Ratings cai ai 10 Input Power Requirements Line Voltage 10 Eine Regulation aan a ara ara 11 Required Wire Size 22e honte alin one eee es een ee nee ee 11 Circuit Protection Mains nana de a iai aka elit 11 Accuracy Statements ucraina 11 ORC RO E BORE A EE 11 MA ere re mens anne van I ROC IS ESTE ten te nel Ne RI RIA ERO 12 TIME nina as a dai 12 Gompatibility anacapri at 12 Bucky Compatibility nf Da EDS aaa Lao ai 12 Aux Power Output sis iaia ia Lai agri 12 INSTALLATION mnt ns tu me lalla lele leali 14 Re TEE 14 NN 14 FEAT FANSTONMON zizi tete nant ili en SALI errata 15 Gontrol veto iaia E irta 15 Access to Inside of Control vit ei anvan say ou pan RR ek a r s Pas pan e RR ei 15 HV Transformer GONNECHONS reale iaia 15 Gollimator POW titers viene te kiss illa alinea bed MIO aa oka a 15 Magnetic LOCK Power nine kata tada ar pak na ath ko de ea 16 Bucky Connections rss dio ko na ipana ob ank ok lalla 16 Incoming Line Cable Connection iii 17 Line Voltage AdjustMents ii 17 Udo EE e DEE 19 GALIBRATION WEE ariana 20 MA Galibrationt ranra iena lag iaia 21 Standby Filament Current
54. voltage is passed through K1 the main line contactor to the inputs of the main autotransformer that have been selected according to the measured line voltage Pressing the ON switch on the operator s control activates the line contactor The L3 T3 terminal of the line contactor is used to latch the incoming line voltage to the coil of the contactor through the Normally Closed contacts of the OFF switch Pressing the OFF switch interrupts the voltage opening the latching contact and deactivating the contactor When the line contactor is closed the incoming line voltage is applied to the autotransformer which then presents voltages at all of its output taps 120 VAC fused at 8 Amps through fuse F2 is then applied to the Main control board power supply transformer T2 through fuse F1 and connector H12 The output from T2 is rectified and supplied to linear regulators which produce 12 VDC 5 VDC and 5 VDC which is used to operate the main control board circuitry as well as the 7 segment displays for kVp and mAs Fuse F2 is also used to supply 117 VAC for all auxiliary components such as the Buckys the Stator Drive PCB Power Supply The Stator Drive PCB has on board primary transformer fusing for its power supply as well as a 10 Amp fuse for the rotor boost voltage kV Selection Tapped voltages from the autotransformer are selected by the kVp Major and minor switches and connected to the two SCR blocks This voltage is also
55. wise instructed Pay close attention to the written sequence of operations for any of these tests Troubleshooting SCR Block Gates e Turn power OFF e Unplug header H7 and H3 on Main Control Board for Backup and main SCR blocks e Measure between pins 1 and 2 and then pins 2 to 3 of each header All readings should be approximately 15 Ohms Higher or lower readings may indicate a problem with the SCR block Troubleshooting Main SCR Gate Drive e Turn power OFF e Unplug both SCR gates from headers H3 and H7 on Main Control Board e Connectan oscilloscope or DC voltmeter from the right end of resistor R31 or R34 to one of the GND pins on Header H13 pin 4 5 or 6 Expect to measure a voltage near 12 VDC e Turn power ON e Before an exposure is made the meter should read either zero volts or 12 Volts DC high or low state During an exposure the output will be a 12 Volt 60 Hz square wave which the DC voltmeter should read as approximately 6 VDC e Make an exposure and verify the output of the square wave gate drive signal At the end of an exposure the drive signal may stop in either the high or low state This is normal operation Troubleshooting the Backup SCR Gate Drive e Turn power OFF Unplug connector H7 from the Main Control Board e Turn power ON e Connect an Ohmmeter between pins 1 and 3 on header H7 on the Main Control Board e In standby the Ohmmeter should indicate an open circuit e Make an exposure
56. witch selects the desired timer setting 8 PREP Button Pushing and holding this button will initiate the Prepare cycle The anode in the x ray tube begins to spin and the filament in the 2002 Universal 11 18 05 page 7 HE425 X Ray Generator Revision D Operation 10 11 tube is elevated to the proper brightness for the mA selected When the Prepare cycle has successfully completed in 1 2 seconds the PREP button will illuminate Releasing the switch will terminate the Prepare cycle Note If the PREP cycle does not begin when the button is pushed you may have previously encountered an error condition which is inhibiting the PREP function Turning the power off and on once will reset this circuit if an error has occurred EXPOSE Button Pushing and holding this button while tte PREP button is depressed and illuminated will initiate the exposure The exposure duration shall end either at the pre selected time set by the Time selector or when you release either the EXPOSE or PREP buttons whichever comes first This button shall illuminate during the duration of the exposure mAs Digital Readout Provides a pre exposure indication of the mAs as calculated by multiplying the selected values for mA and Time This indicator is also used as an error message center if an improper technique is selected If a technique is selected that exceeds the power rating of the x ray tube the indicator shall read E and the unit
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