CORRECTIIü'E UAI¡¡TEIIAI{CE

All pnoeedures should beterminal . Refer to 5 ,3 ,

performed utfllzing the mal.ntenance5 . 4 , 5 . 5 a ¡ r d j . 6 .

5 . L PREDIAGNOSTICS

5 . 2

Refer to MPU, Chapter 4, TROUBLESHOOTINC.

INSTALTATION & IqAINTENAT.ICE TOOLING

A laptop PC (with lcd screen) having the following features isrecomnended:

Operating systen: MS DOS 2.O through 3.2 ( in ROM configuration, i fposs ib le) .

RAM memory ¡ 52O kbytes,

Floppy disk drive: J L/2" (72O),

Port RS 232 connector SUB D 9-pin male (CCITT Notice

Slot available for future noden connection,

25-pin SIJB D printer port.

Conmunications port RS232 on the Senographe is a female2l-point connector. The conmunications cable ( suppliedis an uncrossed RS232 line between:

The Senographe: 25-pin male CANON connector,

And the PC: 9-pin fenale CAN0N connector.

v24) ,

CANONwith the PC)

Short l ist of laptop PC suppliers:

Toshiba T 1O0O (nodel used for Senographe qualification) orT 1OOO PLUS, .

Epson 200 7OI,

Sagem MTP 16-L,

Data General ONE 2T,

The software is a terminal VT22A emulator.

Frtrlrftr A btfEr Err^?¡ /7rao o lnn¡r, lmo obftTl, Itrt Tlrr:r, /rr.\rr rr: alr nlr

5.3 üArTrNG PARAMETERS rN "TNSTALLil ST BMENU

All the paraneters contained in the install sub-nenu (tube heating,AEC caLibration) cart be written without requiring any adjustnent.

This possibi l i ty is very interesting in some cases¡ €.g. for CPUboard 4OO-plfe replacement following a board nalfunction.

5.3.L THEoRY 0F oPERATT0N (RECAP)

See Fig. t .23 .

5.3.2 TUBE CURRENT ADJUSTMENT

The values read under DATA in the INSTAL HEATADJ submenu aredeternined by the operation described in Section 5.4 .4.

5.3.3 AEC CALTBRATToN

The value of PM HV (C* HT-PM ) a¡rd the value of PM gain(C* GAIN.PM) in the INSTAL AEC ADJ. DATA submenu, are deterrninedby the operation described in Para 5 .7 .2.

The value read under AL-K7 (C* AL-K7) is determined by theoperat ion descr ibed in 1.4.8. 1 . b .

The value read under ALF (C* ALF) is deternined by the operationdescr ibed in Para 1 .4 .8 . 1 . c .

The values read under ALA (C* ALA), AL-NRA (C* AL-NRA) andAL-NRB (C" AL-NRB) are given in the table, Para 1.4.8.

These parameters are interlinked to deternine the density, and somust be copied in full. Be sure to update the records of thesepara^meters.

After copying these paraneters, the operating test must beper formed in l -po int node (see Para 1.4.10) .

eErrr| ' \nD^DrJEr Rnrr 'Tt/TQ p Annr/re Qf' i l IT\¡ r¡Er rMFv ñ^?Tltr?i\4 r r tr

5 . 4 CHECKING CORRECT SOFTWARE CONFIGTTRATION (fis. 5.1)

5 .4 . 1 C0NFrGUMTrON 0F SMALL FoCAL SPOT

CaIl up INSTAL CONFIG submenu, then the CONF SF IN 1 submenu.

For a dual-focus x-ray tube, there should be a tt1'f (SENO 500T SENIXH.F. or 6OOt SENIX H.F.) , whi le for a s ingle- focus x-ray tube, thereshould be a i lO'r (SENO 500rS SENIX H.F. or 6OOTS SENIX H.F. ).

Hit E

or E

as the case may be.

NOTEIf the x-ray tube is single-focus (SENO 500TS SENIX

6oors sENrx H.F. ) , Fll l

must be hit even if the il0r' is already displayed. This meansthat the generator will test the large focal spot only duringthe following INIT operations.

5 . 4 . 2 ,

Ca1I up the CONF GS 5L2 submenu.

Check that CONF GS 5I2-O Ís on 0, i f the X-RAY tube is a GS 502-4 .

nI f not , set to 0 by h i t t in | 0 | .

IJIf the X-RAY tube is a GS 5t2-4, the paraneter C0NF-GS 5L2-O nust

nbe set to 1 by hit t ing | 1 I .

l l

If necessary, call up the INSTAL RAM submenu and select RAM END toval idate the change.

CONFIGURATION OF LARGE FOCAL SPOT

Ca1I up the CONF LF IN 1 submenu.

Check that CONG LF IN is on 1 . If not, this indicates heatermalfunction. As soon as the system operates correctly again, 1 wil lbe written automatically by the software in the paraneterCONF LF IN.

If required, eall up the INSTAL RAM subnenu and select RAM END toval idate the change. ( refer to Para 1 .4 .9 ) .

CHECKS 0N TUBE RATINGS (INSTAL CTUB subnenu, Fig. 1.23)

The values recorded in the INSTAL CTUB sub-nenu are contained in theRAMs, to enable nelr tubes to be natched if necessary.

Check that the values are those of the üable below.

5 . 4 . 3

CalI up the INSTAL CTUB subnenu.

r: r-tUsing I J I ar¡d | *l , call up the lower

l l l l .

operating values shown on the screenvalues:

level nenus to check the tube

and the following theoretical

NOTEThe parameter CTB PAII{Mvalue.

is not taken into account, whatever its

5 . 4 . 4 TUBE HEATER ADJUSTMENT

rf data is lost from the RAlrfs on cPU -board 4oo-plrz ( due tomomentary interrt¡ption of the 5 VS for CPU board 400-eltz ¡ , thedefault values are autouratlcally re-entered as soon as the 5 VSvoltage is restored. The default values are glven inSec t i on 5 .4 ,5 ,

Select the INSTALLATION submenu (see Fig

Call up the INSTAL HEATADJ subnenu, thenthen the READY subnenu. The operator issignal that adjustment, can start "

L . 2 3 ) .

the ADJUST submenu, andnotified by an audible

SENO 5O0T SENrX HFar¡dSENO 600T SENIX HFTube: GS502-{+ or

GS512-4

SENOandSENOTube

500TS SENrX HF

6OOTS SENIX HF: GS503-{+ or

GS513-4CT'TIB CBM + 6.500 E+4 + 6 .500 E+4

MAX nAs + 1 .000 E*3 + 1 .000 E*3

CTB PARAM + 0.000 E+0 + 0 .000 E+0

CTIIB LF-G + 6 . t45 E*3 + 6 . t 4 5 E + 3

CTITB SF-G + 1 . 4 5 0 E + 3 + 1 .450 E+3

CTUB LF-E + 2 .820 E- l + 2 . 8 2 0 E - 1

CTTIB SF-E + L.550 E- l + 1 .550 E-1

CTUB LFALP + 6,920 E-6 + 6 .920 E-6

CTTIB SFALP + 6,920 E-6 + 6 .920 E-6

CTUB CT-A + 3.754 E-3 + 3 .750 E-3

If data is lost fr.om the RAItIs ondata is automatically re-enteredagain power.ed correctLy.

cPU boad 400-PLL2, thlss¡hen CPU board 4OO-PlfZ is

Call up the INSTAL CT'UB subnenu.- t-'t

Using I t I and I tl , call up the lowerl_J t_J

operating values shown on the screenvalues:

level nenus to check the tube

ar¡d the following theoretical

NOTEtakenThe parameter CTB PARAM is not

val,ue.into account, whatever its

5 . 4 . 4 TUBE HEATER ADJUSTMENT

If data is lost from the RAIIS on CPU board 4OO-plfe (due tonomentary Lntern¡ption of the 5 VS for CPU board 400-plte), thedefault values are automatically re-entered as soon as the 5 VSvoltage is restored. The default values are given inSec t ion 5 .4 .5 .

Select the INSTALLATION submenu (see Fig

CaII up the INSTAL HEATADJ subnenu, thenthen the READY submenu. The operator issignal that adjustnent can start "

L . 2 3 ) .

the ADJUST submenu, andnotified by an audible

sENo 500T sEl.rrx HFandsENo 600T sENrx HFTube: GS502-lt or

GS512-4

sEryo 500TS sENrxanclSENO 6OOTS SENIXTube: GS503-{+ or

cs513-4

HF

HF

CTTIB CBM + 6.500 E+4 + 6.500 E+4

MAX nAs + 1 .000 E*3 + 1 .000 E*3

CTB PARAM + 0.000 E+0 + 0 . 0 0 0 E + 0

CTUB LF-G + 6 . t45 E*3 + 6 . t45 E+3

C1]TJB SF-G + 1 .450 E+3 + 1 . 4 5 0 E + 3

CTUB LF-E + 2 , 8 2 0 E - l + 2 .820 E-1

CTTIB SF-E + 1 . 5 5 0 E - 1 + 1 . 5 5 0 E - 1

CTUB LFALP + 6.920 E-6 + 6 .920 E-6

CTUB SFALP + 6,920 E-6 + 6 .920 E-6

CTUB CT-A + 3 .750 E -3 + 3 .750 E-3

If data ls lost fr.on the RAItIs ondata is automatically re-enteredagain power"ed correetly.

cPU board 400-PL12, thiswhen CPU board 400-PLL2 is

It is not necessary to hold theentire call.bration procedüre.At termLnation of each exposure,released, an audible alarm wlllfor the next exposure.

exposure swftch down durfng the

the exposure swltch can besound lndlcatlng that ft is tLme

Depress the exposure switch fully and the device should take atleast 18 exposures approxinately 20 seconds apart for a dual-focustube (SENO 500T SENIX H.F. or 600T SENIX H.F. ), a¡¡d at least Lzexposures for a single-focus tube (SENO 500TS SENIX H.F. or 600T5SEI.IIX H. F. ) .

There are nine callbration polnts, three for the smal1 focal spotand six for the large focal s¡rot.Each cal-lbration point requl.res a ml.nLmum of two exposures, oneto adjust and one to check.

Several messages may appear durfng adJustnents:

ARCING and then RETRY: detectfon of htgh-voltage arclng durLngexposure. In this case, the system wlll automatically readJustto a lower hlgh voltage LeveL (minimum J0 kv). rf arclng lstoo frequent, the message becomes ARCING TUBE END. Ttre settingis then refused.

RETRY only. rf this message appears twice for the sameadjustment point without arcl.ng, three seeonds must elapsebetween pressing the lst and 2nd triggers. ReJection may be dueto a Longer tube cument stabilizlng time, but which is notdetrimental to the results. ReJeetl.on may also be due to thesoftware current restrl.ctlon Ln the primary wLnding of theheater transformers of 5.L5 A.

Check the pot 1 setting of the Heater Current board 4OO PLl( see Para 5 .5) .

n

I'lhen adjustnentADJUST END then

is completed, the screen displays:HEATADJ END.

Call up INSTAL RAM submenu and then hit R , RAM END to validatethe new values (see para 1 .4 ,9 ) . l-f

strNoGRApI{tr Eonr /Ts n- Annr lrq qtrNTy r{E TMtrv nn?lrq?M nh

5 . 4 " 5

5 . 4 . 5 . L

CHECKING TIIBE HEATER ADJUSTMENT (Fis t.Z3)

Checking the nA Values

The autonatic calibration can be checked with two controlledexposures using the Terminal Application mode.

Conf,igure the Senographe as follows:

. Mo f i l ter

. Large focal spot

. two-point node

. 3 0 k v" 100 mAs.

Connect a mAs meter (4-600 mAs) to the test mAs jack on the HVblock , 7O1-PL1 board.

Get into the TERMINAL APPLICATION by hitting l-t-l in the nenu. Thescreen will display the following: LJ

. . . . : . . : . : . . , . : . 1 : : . . . . . . . . : : . . : : . : : : , , : : : : : : : : : : : : : : i : j :

J : : - : : : . - : : : . = : - r : . . : i i ? T r : : : : : : : : : : : : i : : : : r : : : : : : . : : . r '

S lü,,.'nOeAL.,.,SPCT. .:,,{ FOC

,,,,,,,,,'.,,,,,',',' " ' :::Y0IJR,..;,SELEC1II0]i[ ,¡,. ,, ,,,i , ,

:. .::.::::.::::::::::.::::.:.:::..:: : ...:.::::::::::::.:::::::::;::::::::;::::;::::;::.. . . : . . . . . : : : . : . : : : : ; : . . ; : . . : . . : : : . : . : j : r ' : : j , : : , : , , : , : . : . : , : . : . : . . :' , , - : t : : : ; . ; . : . : . . t : , . : :. . : : : : . : : . . : : . : : . r ' ' . . : : : : . : : . : . . . : . . : : . : : . : . : : . : : . ; , : : , : . : . . . . . .. : . . . . : : . . . .

. : : . . . . . . : . . . : i . . . : . : . : . . . . . . . . . . . : . . : . . : . . : . : . : . 1 t : . : . : . : : . : . : : . : . : .: . : . : : : : : : : : : . : : . : . . : : : : : : . : : , : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : :. . . . , . , . . . .

: r . .

, . . , , . . , . . . . . , , , . . . i i

Make the exposure by using the exposure handswitch.;

I l l

After the exposure, hit lDl and lEnterl on the terminal.t_l

The screen wil l display the fol lowing:

. : : I

,"'mA

100TPs :,iii:

f . , , , , . ' , ,

. , , ; . , : , : , , , , : , ' , : . : : ; : : : : : . : : : .t¡$ , , ,,.,.., .,;,;.,,,.,.,',.,.,',mAS30 ',,'......,'.,,,.,i ':i..:..'. ' i:.ii;..X00

qtrNnnpAD!¡tr RnnT/Tc I Ánnr/nc QFTITV r¡Er rrr¿.v rrrr?rrFarr nlr

For the Senographe 5007exposure: 30 kV, 25 nAs

or 600T SENIX HF only: take another( for the sma1l focal spot) .

To simulate real system operation, the exposures must be madeat interr¡als of at least one minute to allow the tube to cooldourn, oS tube temperature influences the mA vaLue.

Select the correct parameters.

To change the value in terminal application, input:

LFOCSFOCxxkVxxxmAs

xADJ

1PT

zPTxSCR

for large focal spotfor sma1l focal spotfor xxkV, where xx may be any value bethteen 22 andfor xxxmAs, where xxx is a value between 4 a¡rd 60026 stat ionsfor x density calibration, where x nay be any valuebetween -5 and +Jfor selecting phototimer operating mode (1-pointnode )for selecting nanual operating node (2-point mode)for selecting a screen-filn combination, where x canA through E.

mAs

25

49in

Make an exposure using the remote handswitch.

!{hen the exposure is complete, hit I o I a¡rd ! nlrunn I o" theL J I I

terminal.

Screen display:

uu.

30

..::T0S',... : i : - : . : : : : : .

,:,'25' ' :

For the 3O kV/100 mAs exposure, tolerance is !and ' 5% , 1 nAs for the mAs value .

If the mAs value shown by the nAs meter is outreference (obtained on the terminal), refer toIndeed, the mAs value that is displayed on thereference.

5% for the mA value,

of tolerancePara 5-6,terminal is

from the

ühe mAs

If the intensity shown by the terninal is out-of-tolerance ( ' 5'Á),re fe r to Para 5 ,4 .4 .

Exit from Submenu TERMINAL INSTALLATION by hit,ting [n and f*t*lI_J

5.4 .5.2 Checking the Theoretical Cument Values in the Primary of the HeaterTransformers

CalI up."Subnenu INSTALLATI0N (FiS L.23\

Call,up Submenu INSTAL HEATADJ, and then Submenu DATA.

n nUsing

U and

L:.| call up the menu below to check filanent current

values at the selected points and backup the new data.

Theoretical default values for the V2.2 software of the CPU:

PMAX = 2(4 kt l)

PMAX = 1(3.5 kt . ¡ )

PMAX = 0(3 kw)

$ftaor + 4 .2908*0 A + 4.2908*0 A + 4.290E+o A

40/25 + 4 .25o E+o A + 4 .25o E+o A + 4 .z5o E+o A

4j /20 + 4 . 1 6 0 E + o A + 4 . 1 6 0 E + o A + 4 . 1 6 0 E + o A

301x00 + 4 . 8 6 0 E + 0 A + 4 .860 E+0 A + 4 .860 E+o A

4o / roo+ 4 .?5oE+0 A + ,*??4áog.o A 30 / 100

+ 4:750 E+0 A

+ fr5./G68 E+o A + ,*1?á6or.o A + ,*13660t.0 A30l80 + 4 .730 E+0 A + 4. z3o E+o A + 4 .Z3o E+o A

40/60 + 4 . 5 6 0 E + o A + 4. 160 E+o A + 4 .560 E+o A

4n/4o + 4 . 4 1 0 E + o A + 4 . 4 1 0 E + o A + 4 . 4 1 0 E + 0 A

Smal1focalspot

Larqefocá1spot

If parameter CONF GS 5t2 is set to 1, the first point in the heatercal ibrat ion is made for 30 kV/30 mA.

If parameter CONF GS 5L2 is set to 0, the first point in the heatercal ibrat ion is made for 30 kV/25 mA.

The values on the above table are those automatically set in thesoftware following ÉLn accidental RAM power supply cut (eg: batterydj.sconnecLi.on ) . These values are independent of the status ofparameter CONF GS 5L2.

NOTE

kV levels due to

If the real values are not within

Theoretical default value -200 nA+200 mA,

then the 1 V scale factor at point 10 of XJJ on the HEATER CIJRRENTboard, 4O0-PL1 , for 1 A in the fila^nent, is probab1y out ofadjustnent.

Potentioneter Pl on HEATER CLRRENI board, 400-PL1, nust therefore bechecked and adjusted i f necessary (see Section"'5.5).

NOTE

If this 1 V/L A scale factor fs not correct, the devLce willoperate, but there Ls a risk of tube damage, sl.nce the Ichmaxsafety system on HEATER CURREI{T board, 400-PL1, wil,l no longercarry out its role fn the event of a heater contrcl systemfaLlure.

5 . 5 ADJUSTMENT OF POT Pl ON HEATER CURRENT BOARD, 4OO-PIT

There are three separateof the generator.

the power llmltatLons

range such that:

Real Val-ue"( Theoretical default

a

As a precautionary measure, disconnect the (HV)cables (BNC cables from 4OO-pt4, XJ3 and XJ4).

Enter the INSTALLATION submenu (FiS !.23) ,

Cal1 up the INSTAL HEATADJ submenu and then the

thyristor control

BOARD ADJUST

: ' . i.: i:,:.::::: i,::::::::.:. i.::::,::::::::: i::: i: ' : ' .: ' ' ...: ' : ' ,:::,,,:.,,:,, ' : ' :,:,:,,::,.,:,rr,:'=', '¡. ' " '2'20ó u, i ' ' ,0 A,' : ; : . : . : : . : : : . : . : . . , , , . . . . . : . : . : . : ; : . , , , , . . : .

' . - : : ; : : . : . ; : : : . : . : . : : : : : j : : . i . : : . : . ; i : i : i . . : ; :

. . . . . . : . . : : : t . : . . . . : i . . : . : . : . : . : : . : i . : . : : : . : : : . t : . i l : .

submenu.

Hir E,n

Enter I O I to input the next positive value whieh autonaticallyl l

d e I e t e s 2 . 2 O O E + 0 A .

Enter the new value 4.600 E + 0 A by hitting

E, E, E. E, E ",U 8.

SENOGRAPHE sOOT/TS & 600T/TS SENIX HF IMEX CO7U52M.O4

A = A m pE x , : 4 . 6 0 0 8 + 0 A = 4 . 6 e

Renove the HV cable fron the HV transformer. Insert approximatelyeight-inch . (20 cn) probes into the conmon a¡rd small focal spotholes in the I{V cable lnpuü connections on the }IV transformer. SeeF i g . 5 . L .

200 vDc, fitted with a FLUKE 80J10 shunt, calibrated at10 A/100.8V, on i ts input terminals.

Set dc vol.tage and 2OO mV on the nultimeter.

Press the 1st trigger of the remote handswitch (pressing the 2ndtrigger does not actuate an exposure r since high voltage isprohibited) .

Check that the nultineter indicates a value between 45.40 nV and46.6O mV after stabi l izing for about 5 seconds. I f not, readjustpotenüioqeter P3" on the HEATER clJRREl.lr board, 400-pL1 , for4 6 . 0 0 t o - 6 0 m v . . j : : : . : . . : i : : : . : : : . : . ; ; ; ; : : : : ; ; : : : . :

:, ', ',,,: . ',,, ' ," , ,, ',:,.,,,,,,,,,,,,,..: ', . ,: ':,,::: ,:.:,::,,.: . .. . ., :. '- ca11 'upmenuSF : . : ; : . . r cn . . ' . ' . = . .

l - l . . : . . . : : : : . . : : . : . : : . : : . . . : . . . : . : . : : . : : : . : : . . : : . . : . . . .

by h i t t i ng l ¿ l . : : : : : : : : : i

i-] LJBnter l 0 | to input, the next positive value which automatically

t_¡

deletes 2.2OO E + 0 A.

Enter the new value 4.600 E + O A by hitting

E , E , E , E , E a ' d E .Press the 1st trigger on the renote ha¡rdswitch (pressing 2ndtrigger does not actuate an exposure, since high voltage isprohibr ted) .

Conpare, the value displayed on the nultimeter with the valueobtained on the previous nanipulation (large focal spot) t 1 nV andopposite sign.

ADJUSTMENT OF POT P5 ON THE kV/mA MEASUREMENT BOARD5 . 6

As a precauti.onary measure, disconnect the HV trigger control cables(BNC cables on 4OO-pt4, XJ3 and XJ4).

Connect a current generator to TP10 and the OV/M (test point of Rllar¡d R95 ) .

Adjust the current generator for 100 nA.

SENOGRAPI{E SOOT/TS 8. 6oorhs strNTx }¡E' rMtry nn?rrtr?M nh

Turn the Senographe on.

Adjust P5 for a reading

5 . 7 AEC ADJUST!'IEM

4 kflz for 100 nA neasured at W!2.o f

NOlE

The AEC operates at a constant Pttl IIV value. Thls value Lsdeterml.ned aut¡mattcally by actl.vatfng Regul. PMBOARD & Run.The operatl.on Ls descrlbed fn Sectfon 5.7 .2.

5.7.7 ADJUSTMEI{T OF PHOTOMULTIPLIER BOARD, 4O0-p1,11

5 .7 .L .L Vol tage adjustnent

Insure that junper ST1 is present on PHO?OMUtTIPLIEH board4oo-PL11.

Connect a 1000 VDC voltneter between the shielding and the core ofthe coa><ial cable on PH0TOMULTIPLIER board 400-pL11.

Turn the Senographe on and wait until initialization is conpleted.This operation loads the O value into the board's digital-to-analog converter.

Call up the INSTAL C0NFIG subnenu and bhen the II{STAL AECADJsubmenu (FiS L.23) .

CalI up the INSTAL AECADJ PMADJ submenu and then lheRegul. PMBOARD & Run submenu

Adjust potentioneter P4 on the PHOTOMULTIPLIBR board, 400-PL11, for8OO V on connector PR3 when the PM is connected. (connectors PR3 ar¡dPR4 connected).

SENOGRAPHE SOOT/TS 8" 6OOI/TS SENTX I{F' TMtrX CO?ITq2M. OIT

Adjustment of photomultiplier current gain

- Tbrn the Senographe off.

4oo-Pt 11.

Connect a¡r oscilloscope to test point TP6 a¡rd the measurenentreference' to ',the negative terninal of capacitor czj.

' . . t :

- Turn the Senographe on.

Adjust potentiometer Pl on PH0TOMULTIPLIER board, 400-pL11, to readone pulse every second ( 1 Hz\ on the oscilloscope. This settingallows offlset adjustnent.

At PR4, introduce a negative current source of approxinately 1microa^mpere. To simulate a current generator, util ize a nultineterin ohuneter position with a rating of 200 kohms and with a 10 kohniesista^ria.e' in series. (A 10 megohm resistor can be used, connectedto the -tZ VISO supply). See below:

,/ ..

L2 VISO , '---*- Ammeter.¿$oo P"trri :

Resis tor10-megohn PR4

4ooPLII

' 5 : ] i 2

1 . , ,

In b6üh cases', the current supplied by the nultimeter nust bemeasured using another multimeter in nicroampere position.

Let I be the current measured in microamperes.The value should be such that:

0.5 $ < I < 2 r-A

Adjust potentiometer P2 to obtain a frequency of 4 kHz x r towithin *5/ on test point TP6 (the rat io is 4 kHz:1 FA).

ADJUSTMENT FOR OPTTMUM PM HV VALUE

Install the 18 x 24 em moving gríd with no cassette inslde.

Place 4 cm of plexiglas on the noving grid.

No conpression paddle instal led.

Select the nolybdenum filter,

Select, a source-to-image distance (SID) of 650 mn (tfr is distanceis f ixed for the SENO 500TS sENrX H.F. and 6oors sENrx H.F.).

The adJustment of pot Pl interacts wlth the adJustment of pot P2.

QE"RTñI':D^DIJE tr^^?n /rFe g Ánnrt /¡r.o cflttrv Lrr' 'rrrr:t\,r r1t\Frrr=-tr. nlr

E n t e r t h e I N S T A L L A T I 0 N s u b m e n u ( F i e L , 2 3 , } . ' - ' |

Call up the INSTAL AEC ADJ submenu, t\e¡ the Regul,. , PItsSARD & Runsubmenu

rr.Make an exposure ( the 2nd trigger delay is entirely controlled bymicroprocessor ) .

: ' .

optimun high voltage value. After this the renote trigger should bereleasgd. , -r. . . . . . . : ,r , : _.

Ttre nessage PMADJ END will appear on the screen.

If the ERR. SYSTEME or ERR. MRSURE t"q""gé appears, look for anoperating error (phantom error) or a nalfunction.

r:1Exit this nenu by hitting lTl as often: as qgquired.

t l

Call up the INSTAL AEC ADJ DATA submenu and 1$hen ,the, CA ffT PMsubnenu to record the value of PM HV.. , : , . .

CaIl up the CA GAIN PM subnenu to check the PM gain value. Thevalue displayed should be in the range. 4 .25: rF' + 0 through5.L5 E + 0. If not comect, check the abqve conf,igurations andrepeat the procedure.

CalI up the INSTAL RAM submenu and . then the" BAII{ ,E}ln sutrmenu tovalidate the new values.

5.8 X-RAY TUBE REPIACEMENT

5.8. 1 MECHANTcAL ASSErvtsLy

See Figures L.9 through 1 . 13.

5.8.2 MECHANTCAL POSITIONTNG

5.8.2. ! Physica l inspect ion

Make sure that the painted surfaces ,of;, the sysügm and accesso$ies. are clean and in good conditior.

, ' : 'Make sure that all scales, dials and switches on the system andaccessories are legible.

Make sure the protective glass screen , i" clean and properlyposit ioned.

StrNoGRAPHtr 600T/T3 & 600r/rS StrNTX T{F TMRX C0?rr62t ,O¿r

Mdce sure the nirror is, clean :

. remove the beam-limiti.ng device

. S!{ITCH ON THE SENOGRAPHE .,::

" swítch on the llght-centering device-!;,. ',:.: '. 'r,*'l:i T :,;jg, btrO-.w,,,HÍIV QUSt ér*ay.

1 , . . 1 . . , : " : , ' 1 : ' j , . , . i r . ; , ; . i \ . . . t

. 1 :,.:-.r r;j 1BS CAREFUL NEVER T0 TOUCH TllE MIRROR

', 5.8.2,2 Centering and posit ioning test

j ' i l : . : i ; , , ' ' i . ; i . i , ! : n: r ' i . ; td i * : ; ; i - : ' : , " i i r ; : ln , ' r " ' ' l '

i ,** 1*? SRQ tt¡e -',SI;D i.to ;.65O mm and select the O. 3 nn focal spot.'

, t : i : ,, - . . i r ¡ ! . , ; t . : i l r t . . , , i ¡ , i : . :' ; r ' , j + r .

.:.,.Po"sit'iqn,." ühe-"1,8,."x 24/650 bean=limiting device and remove theconpreaslón paalalle.

. : . : . ' . l : . J . . . : . r J f : : " ' : .- Place a 24 x J0 fJ.In pouch dlrectly ón the inage receptor wlthout

gr id, see Ftg. , .2.

,i,-; .:r:,.,..,:,.o r.,.üse.,q,¿r.eedl"lg tpÉglerqe the undersfde of the-filn pouch ln two¿¡i::' "r '. , .. PPsi"Uio-tw,;o4,¡1he , thoPax side , see Ftg. ! . 2 .

: , J j r , , , j . ) r , 1 ; " . r i . . ,C t , l " : ¡ r ¡ ! , ; ! i - r -

;r¡.'.-' r',d'; '-;' S$gctl30".kY,Qnér50 nAs on the control panel. ,. , { : . ' : ' : , . - ¡ , ' . , 1 . , . . , ' - ' , ' r ' ' l i c

,.,¡:, , .-" ¡l$¡rg.sS,9)SFo.$SF?.i r.

Join the 2 dots on the developed exposure film.:1 n Check that the i.mage does not go over this line by nore than 10 mni -

1 l;,;; i .; ..¡ '; .., r'.on.1the i,üh¡drgry,¡g-f {e. ,, ,::

5.8. 3 TUBE CURRghn ADJ{TSTMENT

Run the prücedure described in para 5 .4 .4 arrd 5 .4 .j .

5 . I . 4 CHECKING TECIü.IJQUE FACT0RS ( kvp and mAs )

Cheek that, the AHC cal-ibration procedure performed on the previoustube yieJ-ds satísfactory results with the new tube. Perform the AECcalibrst,ion test {paragraph 1 . 4 . 10) .

If resuLts are noü 'satisfactory, perforn a simptified AEC calibrationprocedure rather tban a full one, as replacing the tube does notrequf re nodification of parameters AL-A, AL-I.¡RA and AL-NRB,

,,iISENO$RAP}IEJ'5OOT;IT$.& 600T/T5 SENIX HF IMEX CO?II62M OIr

5 . 9 CENTERING DEVICE LAIÍP REPIACEI'IENT

: - - , . - ' ' , . : i¿ ! : ' ; , , . i { ' { ' . : ; i ' l * . , , ; , l l

Turn the Senographe of f . i ' ' " , : : : ¡J¡ , ' i i '1 . : i : i^ . . , " ' - r ; :i . : , , , . , ; . . . 3 ^ ,1 . , . ; , , . ,

Unscrew the four screws, Fig. 5.1' Éef . ' i ( : l ) ' . , i f ienove the defeCtive

bulb arid insert the new one. Ttre pins of the bulb must becompletely a¡rd symeürically plugged rfrñüó tffie soeket.

CAUTION: , : , , . i ' - : 1 - i , 1 1 ' : . t - i h , : ¡ . i i , - " , . .

' , i ' . ; t

Hhen insentlng tt¡e ner¡ bulb, do not handle ttre bulb lqith yourfLngers. Ttre oÍ1 from your flngers t**.in'adrrei'b -'üo thé glassenvel.op and wlll burn when the bulb ls,,aoTg.4 ol..

, ,,,:

, , i i ! ; l : ' , ; , ' i ; ; t ; ' . t , ; . t , : ' . ,1' . . r- :1 . , . ,

Remount the lanp assembly arrd the form,,lr"""yg,, _FiB.,,5.f_

ref " (1) .

Turn the Senographe on.

Swit,ch the centering device ON and check for riórreet centering ofthe light beam on the i-mage receptop. íritthe'k{'üera1"'''bdges of thelight field should be synetrically posiüioned with respect to theimage receptor a<is within t 3 mm, an&i;thé:,fóÚntiedge of the lightfield should overlap the costal grid edge of the inage receptor by7 to 13 mm. Correct beam centering if .ineéé$ddry ruÉ{nS the twoscrews , F ig . 5 .3 re f . (21 .

NOTE. : , ' , : . , : . , . { r . ; , . : * ] : . :

Use bulbs listed Ln the spare parüp;rllSGTQl/Il,lustrated Parts Lfst.

or ln the

SENoGRAPHE 500T/TS & 600T/TS

4 PRETüENTITúE MAINTENANcE

4.1 $.trRoDucrroN

Preventive maintenance for ún. Senographe consists nainly of routinemaintenance operations and operating checks.

These operations should preferably be carried out by a MaintenanceEngineer trained on the Senographe.

4.2 ScHEDULE & opERATroNs

The preventive maintenance operation occupies a Maintenance Engineerfor about four hours.

4.2.L ANNUAL MAINTENANcE OPERATI0NS

4 .2 .1 . ! Phys ica l i nspec t ion :

Correct column operation,

Correct paddle operation,

Correct operation of indicator lamps and controls on the controlpanel ,

Comect operation of the light centering device,

Lubrication of gearurotor chain.

4 .2 . ! .2 E lec t r i ca l i nspec t ion :

Power supply voltage checks,

Reading of counters on the ELECTRONICS backpanel,

4 .2 .L .3 Opera t ing inspec t ion :

Run an operating test and compare the results and exposures withthose taken at installation a¡rd at previous preventive naintenanceinspections.

QEit\T^nD^DLrÉi tr^/ l 'T|/¡na p Ann.n/nc QErr\rTv LIEa r lrDv ^n?TTÉar\r n/r

4,2.2 FouR-yEARLy MAr},¡TENANCE 0PERATT0NS

4.2.2. ! Check the radio logy paraneters:

Use a MACHLETT DYNALISER TII (high voltage unit with digitaldisplay) , or an equivalent test instrunent to check kVp a¡rd mAs.

You can also use the KEITHLEY kVp divider and the "Linear Manno Pack"(ref. 3735LC) to check kV values in the 22 thru 40 kV range. Use the"Cadmium K Edge Mammo Pack (ref, 37355C, for accurate measurement of27 .5 thru 29,5 kVp for ma:nmography x-ray source assenblies withnolybdenun anodes, beryllium windows and nolybdenun filtration.

Note: Use a fast, accurate, wide-band storage osci l loscope.

For nAs values over 100 a GESPONER MMD mAs-meterused. For exposure times of more than 10 secondsMMD nAs-meter.

nay alsouse the

beGESPONER

Connect the Dynaliser between the x-ray tube and the High Voltagetank.

Plug the mAs-meter circuit into the test jack TI1 on the kV/mAmeasurement board, &s indicated on f igure 4.1.

Adjust the Dynaliser. Trigger source. Trigger level. kV delay. Trigger node. Procedure

The nAs meter is seriallycircuit. Before naking an

CAUTIONconnected inside the high voltageexposure, check your connections.

fo l lows:kvp75 'l of kVp10 mspercentagenormal

Make two exposures for each of the folrowing values:22 kV 20 nAs SF 35 kV 320 nAs LF22 kV 4 nAs LF 4f kV 20 mAs SF22 kV 500 mAs LF 4f kV 4 mAs LF35 kv 20 nAs sF 4r kv 120 nAs LF35 kV 4 nAs LF

(SF = snall focal spot, LF = large focal spot)

Record the values measured on the measurenent sheets n" 2 below ar¡dcheck that these values are within the tolerances.

Tolerance nust be calculated using the following formulas ¡

r kV l ini ts = kV selected t (2 / + 2 6M1)Machlett -.1

¡ - n A s l i n i t s = m A s s e l e c t e d t ( 5 I + 1 n A s + 2 6 l t l 2 )

Keithley: kV l ini ts = kV selected t (zfr + 2 6M1 + 2 6m1)

EIt{ is the accuracy of the measurenent instrr¡ment, for ITIACHLH|TDYNALISER III:

EI {1 = A.75 + 0.01fxV, . 6 lU2 = 0.1 + 0.O26xQ + 0.0O1xT

Elll : in kilovolts V : Voltage in kilovolts6M2 : in nAs 0 : nAs of the exposureT : exposure tine in nill iseconds

6tv11 represents the accuracythe nanufacturer' s brochureEnl represents the accuracyi t (osc i l loscope) .

of the neasuring instrunent given byaccording to the "Maqno Pack" used andof the neasuring instrunent used with

The EM values must be calculated for each exposure because theydepend on the exposure time.As a resul t :

kV l imi t ,s = kV selected t (1 .5 + 0.05xV)nAs l im i t s = nAs se lec ted + (1 .2 + 0 .10zxe + 0 .002xT) .

Exanple:kv serected = 22, nAs selected = 20, small focal spot.

Make the test and assume that neasured time for the exposure is:T + 93O ES, then:E M 1 = t . 5 + 0 . 0 5 x V = t . 5 + O . O J x 2 Z = 2 . 6 k V6l t {2 = L.2 + .102xQ + .002xT = ! .2 + 0.102x20 + 0.002x930 = j . ! nAs

Then the limit, values are:22 t 2 .6 = 19.4 thru 24.6 for k i lovol ts ,20 t 5 .L = 14 .9 th ru 25 .L fo r nAs .

4.2.2.2 Replace the CpU board bat tery, 400-pt 12

ülhen replacing the CPU board battery, 400-pLLZ, the RAM memoryshould be maintained ON by temporarlly corurecting another batteryin parallel. Otherr^¡ise, the installatign procedure must be repeatedto rewrite the working parameters in the RAITI (see section 1.4).

DÍEASUREMENT REPORT SHEETS4 . 1

See following pages.

QDI\f^nD^DLILI trn^rn /.FC: O (nn'n /.no f tEt t lar . \ t / r r rOrrr - r r r n l ¡