Philips PM3055 Service Manual
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Philips PM3055 Service Manual

Philips PM3055 Service Manual

Dual time base oscilloscope
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60
Dual Time Base Oscilloscope
MHz
PM3055
Service Manual
4822 872 05327
880411/2
WARN ING: The s e se rvicing ins t ruc t ions are for use by qualified per sonne l only.
To reduce the risk of e l e c t ric sho ck do no t perform any servicing o ther
then that s pecified in the Operating Ins t ruct ions unle s s you are ful l y
qual ified t o do s o .
PHI LIPS

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  • Page 1 Dual Time Base Oscilloscope PM3055 Service Manual 4822 872 05327 880411/2 WARN ING: The s e se rvicing ins t ruc t ions are for use by qualified per sonne l only. To reduce the risk of e l e c t ric sho ck do no t perform any servicing o ther then that s pecified in the Operating Ins t ruct ions unle s s you are ful l y qual ified t o do s o .
  • Page 2 , Conseque n t l y , thi s i ns t rume nt may incorporate mino r chang e s in de t ai l from the i nfo rma t ion contained in this manual . � N . V . PHILIPS GLOEILAMPENFABRIEKEN-EINDHOVEN-THE NETHERLANDS-1988 PRINTED IN THE NETHERLANDS...

  • Page 3: Table Of Contents

    Page CONTENTS 1 -1 SAFETY INSTRUCTION S ...... 1-1 Introduc t io n S afe t y pre c autions ....1 -1 1 .2 1 - 1 Caution and warning s t at eme nts Symbo ls 1 - 1 1 .4...
  • Page 4 4 -1 ATTENUATOR UNIT (AI) 4 .1 Ver t ic al at t e nuat ors • • E xt e rnal input 4 -2 4 .2 PRE-AMPLIFIER UNIT (A2 ) 5 -l 5 . 1 Ver t ic a l pre -amplifier 5 -l 5 -2 MTB t r igger pre-amplifier...
  • Page 5 1 0- 1 FRONT UNIT ( A7 -A8 ) 1 0. 1 0 - 1 Mic rocomputer c on tro l c ircuit • • • • • • • • 1 0 .1 1 0- 1 Introduc t ion t o MAB8052 microcompute r 1 0.
  • Page 6 Checking and ad ju s t ing procedur e 1 3.4 · • • • • • • • • • • • • • • 1 3-9 1 3 .4 .1 Preparatio n ..1 3-9 1 3 .4 .2 Powe r supply ad justme nt...
  • Page 7 SAFETY INSPECTION AND TEST AFTER REPAIR AND MAINTENANCE IN 1 5 . THE PRIMARY CIRCUIT 1 5 -1 1 5 .1 Gener al dire c t ives 1 5 -1 1 5 .2 Safety compo nent s 15-1 1 5 .3 Checking the protec t ive earth connec tio n 1 5 - 1 •...
  • Page 8 Page LIST OF FIGURE S Figure 2.1 Dimensions F igure 3 .1 Block diag r am 3 -6 Figure 4.1 Tab l e of a t t enuator s et tings At t enuat o r unit p.c .b . F ig ur e 4.2 Figur e 4 .3 Circuit diagram of a t t enuat o r , eh.
  • Page 9 B i t t rans fer 1 0- 1 Figure 1 0.1 10-2 Figur e 10.2 De fini t ion of s t ar t and s top cond i t ions r 2 c s t ruc tur e 1 0-2 F i gur e 10.3 Pinning of mic roc omputer MAB 8052...

  • Page 10: Safety Instruction S

    SAFETY INSTRUCTIONS Read these page s care ful ly be fore ins t al l at ion and use of the ins t rume nt. INTRODUCT ION The fo l lowing c lause s contain info rmat ion , cautions and warning s which mus t be fo l l owed to ens ure s afe ope rat ion and to re tain the ins t r umen t in a s afe condit ion.

  • Page 11: Impaired S Afe Ty-Protection

    ---- ------- -- ---- 1 .5 IMPAIRED SAFETY-PROTECTION Whenever i t is l ikely that safety-pro t ec t ion has been impai red , the i ns trument mus t be mad e inoperat ive and be s ec ured agai ns t any unintend ed operat ion.

  • Page 12: Charac Teri Tic -

    - Prop e r t ie s expre s sed in numer ic al val ue s with s t at ed t o l eranc e are guarante ed by PHILIPS Specified non-to l erance nume rical val ue s indic at e tho se that could b e nominal ly expec ted from t h e mean of a range of ident ic al ins t r ument s .
  • Page 13 ---- ---- --- Figure 2. 1 Dimens ions * Ma s s 7 , 5 kg * Operat i ng pos i t ions: a. Hor izont al ly on bo ttom fe e t b . Vert ical ly o n rear fe et c.

  • Page 14: Vertical Deflection Or Y Axi

    2 -3 CHARACTERISTICS SPEC IFICATION ADDITIONAL INFORMATION DISPLAY * CRT Type No P HILIPS D 14 -37 2 8 x 10 d iv. Me a sur ing area 80 x 100 mm 1 d iv. 1 0 mm ( h x w) 1 sub d iv.
  • Page 15 ADDITIONAL INFORMATION CHARACTERISTICS SPE CIF ICATION * Max. i nput 400 V ( d .c . + 8.c . v o l tage peak ) Max. tes t vo l ta­ 500 V Max. duration 60 sec. ges ( rms) * Bandwidth fo r >...

  • Page 16: Trigge Rview

    2 -5 ADDITIONAL INFORMATION CHARACTERISTICS SPE CIFICATION * Base-line jump < 1 sd b etween a t t enua- tor s t ep s 2 0 mV 10 V • • Add i t ional jump < 1 ,5 sd b etween 1 0 mV <...

  • Page 17: Horizontal Defle C Tion Or X Axis

    2 -6 CHARACTERISTIC S S PEC IF ICATION ADD ITIONAL INFORMATION 2 . 3 HORIZONTAL DEFLECTION OR X AXIS * Horizo nt al d i s ­ MTB , MTBI, p l ay modes ALT.TB, DTB X -DEFL 2.1.1 Mai n Time Bas e ( MTB ) 50 ns 0,5 sec .

  • Page 18: Ext Input

    2 -7 ADDITIONAL INFORMATION CHARACTE RIST ICS S PE C IFICATION * De l ay t ime Mul ­ t i pl ier 3% + 1% inc remen­ * 1 only E rror l imit t al delay error + 2 5 ns +/ - 5 ns Inc rement al de­...

  • Page 19: Trigge Ring

    ---- INFORMATION CHARACTERISTICS SPECIFICATION ADDITIONAL TRIGGERING 2.4. MTB t rigge ring * Trig.mode AUTO (au t o free Brig ht line in Aut o free run st art s 100 ms run) absence of t rigger (typ. ) afte r no t rig.p u lse. signa l Swi tc he s aut omat ical ly t o auto Triggered...

  • Page 20: Dtb Triggering

    CHARACTERISTICS S PE C IFICATION ADDITION AL INFORMATION 2 .4.2 DTB Triggering * DTB t rigge r sourc e S t art s, A, B, TVL has s ame t rig.source as Compos i t e ( AB ) , MTB t ri g.

  • Page 21: Auxiliary Input Or Output S

    De t a i l s on the se procedure s and fa i lure cri teri a are suppl ied on req ue s t by the PHILIPS organi s at i on in your c ountry, or by PHILIPS , INDUSTRIAL AND ELECTRO-ACOUSTIC SYSTEMS DIVIS ION , E INDHOVEN, THE NETHERLANDS.
  • Page 22 2-1 1 ADDITIONAL INFORMATION CHARACTERISTICS SPE C IFICATION MIL-T-28800 C p ar . 3 .9 .4.1. * Vib r at ion ( ope ­ rat ing) t e s t e d , par. 4.5 .5.3.1. Freq. 5 1S Hz 7 min.
  • Page 23 2-12 CHARACTERISTIC S SPECIF ICATION ADD IT IONAL INFORMATION * Magnet i c Radi a­ Tes t ed in conformi ty wi t h IE C 3 5 1-1 par. 5 .1 .3.1. t ed Suscep t ib i ­ Meas ured with ins t rume nt in a l i ty Maximum De­...
  • Page 24 3 -1 INTRODUCTION TO CIRCUIT DESCRIPTION AND BLOCK DIAGRAM DESCRIPTION 3 .1 INTRODUCT ION TO CIRCUIT DE SCRIPT ION The func t ioning o f the c i rcui t s i s desc r ibed per pr inted-c ircuit board ( p.c .b .).
  • Page 25 3-1 0 BLOCK DIAGRAM DESCRIPTION ( see figure 3.1). Int roduc t ion 3.2.1 Thi s b l ock d i agram d e sc r ipt ion i s ba sed around al l the impor t ant func t ional b lo cks and the ir inter c onne c t ions. The interconnec t ions b e tween al l p.c .b.'s are given in the interconnect ion d i agram o f f i gure 1 4.5.

  • Page 26: Figure 3 .1 Block Diagram

    3 - 6 ,--------------------------------------------r - ' : ' CHANNEL A GAIN X1,X10 AMPLIFIER PROBE INDICATION TO F'RONT UNIT CHANNEL GAIN X1.X10 AMPLIFIER PROBE INDICATION ATTENUATOR UNIT (A 1) CONTROL A CONTROL B SIGNALS SIGNALS !CA I [CBI OLEN B �-------------------------------------------_j- Figure 3 .1 Block diagram...

  • Page 27: Pre-Ampl I Fier Unit (A2)

    --------------------------------------------------- POSITION CXYA CXYP VERTICAL CHANNEL SWITCH TRACE VERTICAL CHANNEL SWITCH CXYA CXYP TRI G G E R SELECTION SLOPE 02302,2303 --.- -[ PRE-AMPL I FIER UNIT (A2) Moo@ CONTROL XYA CONTROL XYP SIGNALS SIGNALS ICXYAI ICXYPI ALTCL N f---...

  • Page 28: Trigger Amplifier

    � · --·-·-·---·-·-·-·-·-·-·-·-------·---- ------· ·-·-·--· XYZ AM TIME BASE UNIT (AL.) � DELA' DELAY LINE COMPE � CRT CONTROLUN � -2.'" (AS) BLACK ____ "' ' TV TRIGGER SELECTION ·- ----- TIME ',�,uc'�, ' , BASE CONTROL Cl RCUIT _j ' _______ FINAL TRIGGER AMPLIFIER...

  • Page 29: Power S Upply Unit ( A6 )

    ------ JLIFIER UNIT (A3) ------------------------l [CRi" i UN I T TR ��5) ROTATI O N SUPPLY UNIT r--.--.--.--.--. -- .--.--. _; POWER (A6) X1 CAL STABILIZED SUPPLY VOLT AGES fser>se -2.1kV -2kV � ---- ---- ---------------- ------------ MAT2127 9&0214...

  • Page 30: Delay L Ine Driver

    3-11 * Ver t i c al channe l s A and B : Bot h channel s are comp l e tely iden t i c a l and receive the i r input s i gnal s fr om the ATTENUATOR UNIT. Thi s s ignal i s app l i ed to the SIGNAL S PLITTER , wh ich has three out put s : - two outpu t s app l ied to the SLOPE / TRIGGER SELECTIONS for MTB o r DTB t r i gger ing.

  • Page 31: Z-Ampli Fier

    3-12 Time-ba se un i t 3 .2 .5 Th i s uni t incorporates the main t ime-b a se ( MTB ) , the de l ayed t ime -base ( DTB ) , t he hor i zont al ampl i fier and the Z amp l i fier c ir cui t . Al l func t ions are contro l l ed by t he CXl and CX2 s i gnal s , gene rat ed by the HORIZON TAL CONTROL CIRCUIT b l ocks .
  • Page 32 3-13 * CRT contro l c ir cuit s : The FOCUS AMPLIFIER b lock i s influe nc ed b y both front-panel FOCUS and INTEN S contro l s to pro vide a focus that is independent of t he in tens ity , and dr ive s the foc u s ing gr id G3 of the CRT.
  • Page 33 ATTENUATOR UNIT (A1) 4 . 1 VERTICAL ATTENUATORS The A and B channe l at tenua tors are iden t ic al : there fore only channe l i s descr ib ed . Al l re l ay and FET swi tche s are contro l led by the mic rocomputer via the 1 2 c b u s .

  • Page 34: External Input

    4 -2 The imped ance conver ter s e r ve s a s an inve r t ing buf fe r c ircuit for the h 1 gh 1mpedance at tenuator. For the l .f.- fe edback the output s i gna l o f this s tage i s routed to the l .f .
  • Page 35 NOCOD DODOCOOOO � DOODOODOOODOD � X1009 cccccccccccca cooooococccco C100Z MATJ INPUT INPUT INPUT 8802 F i gur e 4 . 2 At t enua to r un i t p.c.b .
  • Page 36 INPUT COUPLING X lOO- A I 10 11 K1002 R100 3 V1004 61E9 B A 4B3 01001/12 - J£1201 I 10 1 1 K1001 C1045 C1046 � R1050 � 6 8 ,u I ,o -1 7a +S A +S A �6, 4 V -6, 4 V 10VREF...
  • Page 37 01061 (1076 -12a 01001 N100 1 RE F NO TYPE :,[] 01001 TE A 1017 +12o -12a 01061 00.0203 N100 1 �A 7 14 MAT3169 +12a 880212...
  • Page 38 4 - 6 INPUT COUPLING 1oo- 01101/ 15 lfl1�3 10 11 K 1102 01101112 l O n K 1101 CH B V1112 Vl1 B B A t.83 B A I. 8 3 -12 b V1117 B A 4 8 3 B A 4 8 3 N1101 R1421...
  • Page 39 01161 G A IN X1 G A IN X10 +12b (1176 01101/2 �0 R 1179 - 8 K1101 K1102 K1103 MAT 3170 K1104 880212 l1 R1118 R1108 / R1124 R1114/ R1128 R1132 K1106 K1107 K1108 : EXT K1201...
  • Page 40 4- 8 <D NDCDDDDDDODODD N D ODOODO D D DDDO � X1009 C H A C H B MAT3147 INPUT INPUT INPUT 880205 F i gure 4.5 At tenuator uni t p.c.b .
  • Page 41 4-1 0 1 2 [ I 1 0 o K 1201 R1201 E X T + 1 0 V R E F R 1 2 1 3 -12( (1441 + 1 2 C [1444 - 1 2 C...
  • Page 42 PRE-AMPLIFIER UNIT (A2) The pre-amp l i fier uni t cons i s t s o f : - Ver t ic al pre-ampl i fier MTB t r igger pre-ampl i fi er - DTB tr igger pre-amp l i fier - P r e-amp l i f ier c ontro l , inc l .
  • Page 43 Th i s s t age compr i s e s the fo l l owing fun c t ions : - Pos i t ion control POS A R7 006 on D22 0 1 - 1 for A and POS B R7008 on e h .
  • Page 44 Int egrat ed c ir cu i t D2304 s e rves as an auto l evel c i r c ui t . The fo l l owing fun c t ion s are po s s ib le . a .
  • Page 45 PRE-AMPL IF IER CONTROL 5 . 4 The pre- amp l i fier contro l converts the data from the 1 2 c bus ( SDA and SCL ) , der ived from the microc ompute r , into the c ontrol pulses for the pre- ampl i f ier un i t .
  • Page 46 - l.n7 \16107 �".. W l + 17V R6020 B".. W I 1 1 ..'>6001 I NX l', h ' , W .l [VDCfAGE� \16110 +lOVRfl- L6107 8YV27 1011� I 100 ,. . _17V l6108 (6117 22� , . . � ...

  • Page 47: Trouble Shooting

    1 4-9 TROUBLE SHOOTING 1 4 . 5 Introduc t i on 1 4 . 5 . 1 fo l lowing informat ion i s provided fac i l i t a t e t r o ub l e shoo t ing . Informat i on c o n t a ined in o t h e r s e c t ions of the manual...

  • Page 48: Power-Up Routine

    1 4- 1 0 - Re s i stors . Can be checked with an ohmme ter after having unso ldered one side o f the r e s i s tor from the pcb. Compare the measured value with the value and tolerance indicated in the par t s l i s t .

  • Page 49: Troub L E-Shooting The Power Supply

    14-1 1 1 4 . 5 . 4 Troub l e-shooting the power supply To de termine whether a c e rtain fault cond i t ion is init iated by the power supply i t s e l f or by the conn e c t e d osc i l l o sc o pe c ircui t s , a dummy l oad i s l i s ted in the table b e l ow .
  • Page 50 SUPPLY A6 " ' " CRT CONTROL A5 " Figure 1 4 . 5 P . c . b . interconnections...
  • Page 51 1 4- 1 3 0 rsc TIME BASE A4 X2004 X4001 X4001 � TO X4016/1 A104 TO X401 6 / 9 TO Xlo01617 A101 X2009 Xl.002 X4002 4102 "' "' "' X4010 Xt.010 � z + A110 0 0 0 X4016 A109 X 1 6...

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