Pioneer-M73-pwr-sm电路图 维修手册.pdf

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1、(v) proruEen I ne lurut oI souno ano v|s|on. ORDER NO, ARP2101 STEREO POWER AMPLIFIER M-73 MODEL M.73 HAS FOTLOWING VERSIONS : r Thlr manual b appllcable to dro M-73/HEZ and HB typer. . Ar to tho HB typs, refor to page 26. r Ce manuel pour le rervlce comprond ler expllcatlonr de r5glage cn frangalr.

2、 o Elte manual de eervlclo trata dol m6todo alulto olcrfto en erpafiol. CONTENTS 1 .EXPLODED VIEWS, PACKING AND PARTS LfST. .2 SCHEMATIC AND P.C.BOARDS coNNECTtON D|AGRAM . . . I P.C.Bs PARTS LIST . -. -. 17 ADJUSTMENTS .22 2, 3. 4. TypcPowar lrquhn|rnt 20tt tol.r.tcc. 2. CAPACITORS: rndin.d in c.pr

3、ity (! F)/volr|g. lvl u.lc6 oth.wis rlot.d p : pF. Indic.tion sirhoor volrTp i. sOV cc.pr .lErrolyri. c+-iror. 3. VOLTAGE. CURFENT: Esignar voltas at (1251 r l25l so (crass B), 251 + 25U EO (Class A)l output(lktlz). E : DC ,olr.G (vl at rc iiotrr tis.d. Vd0. in ) L DC wlt4.t ntcd Powtr. mA : Oc drrr

4、tni .t m inpul .ign.l . il0lE;Voltas .nd current sre shoen in the CLISS I rcde. 4. OTHEnS: A : adiunig point. Th. A d* land on 5 conDo.Ent p.tt indic.r6 ih. im_ oonft. ol thc t lctv l-ior of $. D.n. TtE.tlo., thm rlgl*ing, b. $r. i6 or. p.ns ot i(hnri.rl d6i!.Etion. * m.l.d c?-ito.l ar|d rlEino.t h|

5、vc parB rumblfs, ihi3 i. rhc b.!t .h!fr.r4 di.gr.n, bda lh. -i!al orrl m.Y v.rY dle ro improv.6.n$ n d69.r. S.StITCflES Sl: P0IER Sl FRoill lsserbry LINE VOLTAGE SELECTION (For llEZ and HB typo3l Line voltage caa be cbanged with ollowiDg steps. 1. Disconect the AC power cord. 2. Remove the top cover

6、. 3. Chage the connectiou ol the porer hdnsformerg (Tl and T2) lead wire. , Stick the line voltag label tie rcar panel. Prt o.D.rctb1;oo lwz3o19) 4 7Ia It,.5,.t, 3 0 6 7 ) A B 3C 5a) 0 ea FRONT As s emb I y (AWZ3O69) oaol-ro3 RN12,3 ot01-305 ALl055 0306 aL11r5 o31 7. 31A. 320. 155252 o 3 2 3 . 3 3 1

7、 , 3 3 2 0313.314 55555 0319 RD155A rcr0r. rc102 RcuLAToR (Awz 3 0 66) R E G A s s e m b l y i:;,i:;rJ I l3:3;e:3,*, .+-f oi03, ol 04 RLAY ORIVE OlOA RELAY ORVE 0101,103 256634 0102 Fr1203 0104. 106. 107.2SC2456 0152 0105, 151, 153 2SAl 0.6 or oa 2sBs50 0101-10. s5566 0105. 11,1. 115,155252 o11A-121

8、. 0151 , 152 0106-113 aODF2FC-2 Dr 15 RO4,7E5a2 D117 ROr 2ESa2 tlt- POWER L Assembly (AWZ3076I I rrd* ri6.r6rrd - so, A SP- RCH Aasembly lAWZ3O68l r/l rgl rgL.s.- | 74o*r r, or* oa i1 -q1 .; -i si IJ E o - B C 55.6, t o o o l 04 A /1 oj 02 r A L) B C E FRONT Assembly (AWZ3O69I ._i-.1 rr I ll erlf r

9、I h rl-l li- l. | l r b f - ! /_;:._-. s 7 HEAD PHONE Assembly VOL-F Assembly REG Assembly INPUT Assembly AWZ3O65I _ANP1405_A li* i:! ! i .-. t3rr.r.u 1 .t ,;_-.- ,t,= :-/ I rn !c)- _:; |_-a _J ,_, Assembly - )- Assembly YY 1 21l lo 1 l t l : I1 .-, i i;l ir.r.r. i:-* E1 1 :i it F 1 r I .-.- q 3 EJ

10、I o tl ?r l A T2 !-:) POWER IRANSFORMER A r- AC POWR CORD ac 220v / 240v 1 2 fi/ 6OHz s to t tF.-* r- 1 i=i tt t , r t ! - i ( t? Iol ot trl ol ot ot l i : i , * i ! i 9fri r - - - - ? r-O- r r -r- - I l l l :-;.-llir o-,- t lt l *r-c-+lll,l l , l i l !irli /-!-l4l ! iI,.- j-i qfl ,4 r .1) i.-ts 8 l

11、 rl i i l , !. A IA oBoS tSwoq f,A voss voss la sNiOaOe s t ul leaOESWAI yldmeaeA TYIORI3noHq oA3H r lldmeeeA r*!i A-aOftqt4A-: . i ! i* j.1 t .t s; ;r rl .-ilt:F-, -j. -idl-. -l b l- .l L- l-l- tcl r-;-i;- ? il ? ? ,l -il ll; i - J d 6 l : yldmeeeA ?9 n (aa06swAl lldmeaaA l-JOV yldmeeeA O3fi (AAO8S

12、WAI yldmeeeA TU9hl ;l a rI lldmeeeA XCAt nl9 J 3CFO1vllSf, I L:itl : I I I ! lJ Y ) ,; j /:/r.,i- lSf0eSWAl yldmeaeA R RSWOqyldmeaeA F l lOtOSSWAl $dmeuA J F3W(II This P.C.B. connection diagram is viewed fiom the foil sidc. mcrrA f, 3CROlllER Ir NOO8SWAI yldmorA HCJ-qe OO0SWAI yHmcrlA HCF-qa (r3 o f

13、i-f r-J 3. P.C.Bs PARTS LIST NOTES: . Parts without part number cannot be supplied. . Perts narked by are not always kept in stock, Their delivery time may be longer than usuol or ,hey msy be unavail- able. c The 8, mark found on some component pafls indicares rhe impormnce of the safety factor of t

14、he part- Therefore, when replacing be sure to us? parts of identical designation. . When ordering resistors, frct conven resistance values into code lorm as shown in the following emmples. Ex. I When there arc 2 $ective digits (any digit apan from 0) , such as 560 ohm and 47k ohm (tolerance is shown

15、 by J : 5%,andK-10%). 5&A 56 x 10r 561.,. RDI/4P56fi t 47kQ 47 x 103 473. RD|/4PS6l 0.5a 0RJ.RN2HBEl( t9 010.Rs1PtD( Ex. 2 When there are 3 fiective digits (such as in high precision metsl film rcsistors). 5.62kA 562x t|t 5621. RNl/45R6 A F M.?k No. DrmdptlonPan. ilo. M.rk lo, DcrorlptlonPrnr ttlo.

16、BIAS 1 ASSEMBLY SEMICONDUCTOR Q415 TRANSISTOR POWER L ASSEMBLY IAWZ3O76 SEMICONDUCTOFS IC4O1 PHOTOCIPIJR Q4OT N.DUAL.FET Q4O2_1A TRANSISTOR Q4O6-M TRANSISTOR Q4O9 TRANSISTOR Q41O TRANSISTOR C406,407 MICACAPACITOR C4O8 MICA CAPACITOR C41O ATJDIO FILM CAPACIToR MICA CAPACITOR PL,STYRENE CAPACITOR AUDI

17、O FILM CAPACITOR CERAMIC CAPACITOR ELECTROLYTIC CAPACIT MICA CAPACITOR CERAMIC CAPACITOR MICA CAPACITOR ELECTROLYTIC CAPACIT PL.STYRENE CAPACITOR ELECTROLYTIC CAPACIT CARBON FILM RESISTOR CARBON Ftr.M RESISTOR CARBON FILM RESISTOR CARBON FILM RESISTOR CARBON FILM RESISTOR CAPACITORS TRANSISTOR TRANS

18、IST0R TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISToR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISToR TRANSISTOR ZENER DIODE ITD(RED) DIODE LED(RED DIODE rc817CD 2SK:t89NK 25C1845 2SC185 2SA992 2SCr845 254992 2SCt845 25C2?05 2SA1145 2SA992 zSCl845 2SC2603 2SA1145 2SC2705 2SAle06 2SC3298 2SC1845 R

19、Ds.6FSB AE A3? lss252 AEIA37 lss252 IIZSsALL 1SS252 $zsSArt lssz52 cMAl0u500 cQsxAz22J 160 CFTXAlo3Jso CKDYBI02K5OO cExA33lM2s cMAl2oJ5o0 cMA22oJsoo CFTXAlo3Jso cMA22oJ50o CKDYBI02K5OO cMA050D500 CEXAIOIM2A cQsxA471J l60 CEXAlOIMzA cExAl00M50 CEAS220M50 cM4680J500 CEHAQ3R3M2A cKcYxt04M25 RDRl/2PM1O2

20、J RDRl/2PM224J RDI/4PM122J RDl/4PMTO4J RDI/lPME20J 2SC3298 c01 c402 ol03 c0 c405 cll1 c4L2 Q41r Q4l2 Q413 Q14 Q41s Q417 Q4l8 Q19 Q420 Q421 Q422 Q425 D01 D402 Dt03 D405 IXO6 c413 c4l5 c4l7 c4l8 R40l R402 R40 R405 R406 C42O ELECTR.CAPACITOR C42I ELECTR.CAPACITOR C423,424 MICACAPACITOR C425 ELBCTROLYTI

21、C CAPACIT c/28 CERAMIC CAPACITOR RESISTORS D4O7 ANER DIODE D08.09 DIODE DI1O ZENER DIODE D411.412 DIODE 17 Mlrl No.DrrcdDtlonP! s No.M.rk No.Oarcdptlon Parts No. CARBON FILM RESISTOR CARBON FILM RESISTOR CARBON FILM RESISTOR CARBON FILM RESISTOR CARBON FILM RESISTOR RI6 CARBON FILM RESISTOR R4I9,421

22、 CARBONFILM RESISTOR R422 CARBON FILM RESISTOR R424 CARBON FILM RESISTOR R426 CARBON FILM RESISTOR R407 R408 R409 R4l0 R4l5 R427 R428 R431 R434 R437 R447 R448 R449 R450 R51 RDU4PMT22I RDI/4PM684J RDRI/2PM681J RDRIzPMz23J RDRl/4PM22J RDl/4PM561J RDlt2PM223! RDI/PM4?OJ RDI/4PM512J RD1/4PM332J RDlI4PM2

23、22T RD1/4PM5l2J RD1/4PM122J RD1/8PMTO2J RD1/4PM4?3J ACN1075 RDt/PMF392J RD1/8PM153J RDl/4PM1O3J RDl/4PM562J AEX-002 ACPr043 ACPl&5 RFAV4PSINDI Q5o2-604 TRANSISTOR Q606-608 TRANSISTOR PHOTOCTPLER N.DUAL.FET TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSI

24、STOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSTSTOR TRANSISTOR ZENER DIODE LED(RED) DODE LED(RED) DIODE MICA CAPACITOR PL.STYRENE CAPACITOR AIDIO FTLM CAPACITOR PCSlTCD 2SK38gNK 2SC1845 2SCl845 254992 2SCl845 2SA992 2SC1845 25C2705 2541145 2SA992 2SC1845 2SC2603 2SA1l45 25C2705 2SAl306 2SC3298 25C1845

25、RD5.6ESB AEL.437 1SS252 AEL.13? 1S5252 HZSsALL 1SS252 HZSSAj-L 1S5252 cMAt0lJ500 cQsxA222J 160 CFTXArmJ50 POWER R ASSEMBLY (AWZ3O78 SEMICONDUCTORS CARBON FILM RESISTOR CARBON FILM RESISTOR CARBON FILM RESISTOR CARBONFILM RESISTOR CARBON FILM RESISTOR RESISTOR (0.33, 5W) CARBON FILM RESISTOR CARBONFI

26、LM RESISTOR CARBONFILM RESISTOR CARBON FILM RESISTOR D6O7 ZENER DIODE D608,609 DIODE D6IO ZENER DIODE D6ll,612 DIODE CAPACITORS IC601 Q60l Q609 Q6r0 Q6l I Q6l2 Q6l3 Q6l4 Q61s Q6r7 Q6l8 Q6r9 Q62o Q62l Q622 Q62s D60l D602 D603 D605 D606 c60l c602 c603 c604 c605 TH4OI vR401 VR vR402 VR Other resistorg

27、REINFORCE L ASSEMBLY CAPACITORS C526,527 MICACAPACITOR CMA221J5OO RSISTORS R545.546 FUSLIBLERESISTOR RFA1/4PS4R R5? RESISTOR (0.33, 5W ACNI075 R548 CARBONFILM RDU4PMF392J RESISTOR C606,607 MICACAPACITOR C6O8 MICA CAPACITOR C61O AUDIO FILM CAPACITOR CERAMIC CA?ACITOR CKDYBIO2KsOO cExA33tM25 cMAr20J50

28、0 cMA220J500 CFTXAl03J50 ELECTROLYTIC CAPACIT c6l1 c612 c6l3 c6l8 MICACAPACTTOR CMA22OJ5OO CERAMIC CAPACITOR CKDYBIOzKSOO MICA CAPACITOR ELECTROLYTTC CAPACIT PL.STYRENE CAPACITOR ELECTROLYTIC CAPACIT cM4050D500 CEXA1OlM2A cQsxA7ur60 CEXAIOlM2A cExAr00M50C62O ELECTROLYTIC CAPACIT 1 B Mrk No. Darcrlpf

29、lon Plrtr ltlo. Mltk ilo. Dcrctlptbn P.nt tlo C62l ELECTR.CAPACITOR CEAS220M50 TH60l pTC THERMISTOR AEX-002 c623,624 MTCACAPACITOR CM4680J500 C62s ELECTROLYTIC CEHAQ3R3M2A vR60l vR ACpt043 CAPACIT VR602 vR Acpto4s C628 CERAMICCAPACITORCKCYXIO4M2S REstSToRS Oth.r r.Bistorr RFA1/4PSf)UDI R6O1 CARBON F

30、ILM RDRI2PMTO2J RESISTOR R6O2 CARBON FILM RDR1/2PM221J REINFORCE R ASSEMBLY RESISTOR R604 cARBoN FILM RDrt4pMLz2J cAPAclroRs RESISTOR C726,?27 MICACAPACITOR CMA22IJ5OO R5O5 CARBON FILM RDl/4PMIO4J RESISTOR RESISTOBS R6O6 CA.RBON FILM RDl/PM8zOJ DEsrs.rnp R?45,746 FUSLIBLE RES$mR RFAI/PS4R?J R747 RES

31、ISTOR (0,33,5W) ACNI075 R607 CARBON FILM RDI/4PMI22J R748 CARBON FILM RD1/4PMF392J RESISToR REsIsroR R6O8 CARBON FILM RDPM681J RESISTOR R6O9 CARBON FILM RDRI2PM6SU B|AS 3 ASSEMBLY RESISTOR R6t0 CARBON FILM RDR12PM223J SEMICONDUCTOR RESTSTOR R6l5 cARBoN FILM RDRI/pMzJ Q6l5 TRANslsroR 2sc3298 RESISTOR

32、 R6l6 CARBON FILM RD1/PM56IJ voL_F ASSEMBLY RESISTOR R6l9 CARBONFILM RDtppM223J RESISTORS RESISToR R2r3,214 CARBON FILM RDRI/4pM2?ZJ R62l CARBONFILM RDL2PM?SI RESISTOR RESISTOR F622 CARBON FILM RD1/4PM470J vR20t vR Acw1o06 RESISTOR R521 CARBON FILM RD1/4PM512J RESISTOR R626 CARBON FILM RDV4PM332J RE

33、G ASSEMBLY RESISTOR R627 CARBON FILM RDLIIPML12! SEMICoNDUCTORS RESISTOR IC101 REGTLATORIC M5M8MI2L R628 CARBON FILM RDI/4PMSIZJ IC102 REGIrLATOR IC M5F?9M12L RFSISTOR R63l CARBONFILM RD4PM122J RESTSTORS RESISTOR R $ , r C A R B o N F | L M R D f f i P M 1 0 2 J R l 1 6 C A R B o N F I L M R D 1 2 P

34、 M 8 2 I J RESISTOR RESISTOR R637 CARBON FILM RD1/1PM4?3J RESISTOR R647 NESTSTOR (0.33, 5W ACNlO?s HEAD PHONE ASSEMBLY R548 CARBON FILM RD1/4PMF392J cAPACtToRS RESISTOR R619 SARBSNFILM RDt/8pMlsgJ C301,302 CERAMIC CAPACIToR cKcYB392K500 RESISTOR R65O CARBONFTLM RD1/4PMIO3J OTHERS RESTSTOR JACK AXN10

35、02 R65I CARBON FILM RD1/4PM562J RESISTOR 1 9 Mark ilo.Dc.cptbn P.n! tlo. Mark No.D.rcdptlonPr?tr No. INPUT ASSEMBLY AWZ3O66) SEMICONDUCTORS IC2OT OP AMP Q20r,202 TRANSISTOR Q2O3 TRANSISTOR D2OL202 DIODE D2Oi ANER DIODE RELAIES RY2O1,2O2 REI.AY CAPACITORS c209,zto M5238PF 25c2878 2SCt70S 1SS2s2 RD4.3

36、ESB ASR10l8 CEYAlOOMSO RDRI/PM22IJ RDRV4PM224J RDRr/4PMz2U RDRl/4PM222J RDRT/4PM224J RDRl/1PM1oJ RDRl/PM224J RDI/sPMfEfJ c15l RESISTORS ELECTR.CAIACTTOR EI,ECTROLYTIC CAPACIT ELECTR.CAPACITOR cI(A (0.01/AC400V) cKA (0.0v4c400v) IVfYIR FILM CAPACITOR ELECTR.CAPACITOR CARBON FILM RESISTOR ASR1001 ATFI

37、006 CEASl02M2s CEASRru50 cEAS470M16 CEAS101M25 CBAS471M6 CEASl0rMl6 cEANP3,itoMitS CEAS3R3MSO ACGl002 CQMA104K250 CEASl00M50 RD1/1PMF22U RDI/4PM1O3J RDl/4PMT23J RDl/sPMlIfU RELAY RYIOT RELAY cotL LlOl LINE FILTER GAPACITORS C101.102 ELECTR.CAIACITOR CIO3 EIJCTR.CAPACITOR CIO,105 ELECTR.CAPACIMR C1O6

38、 EIJCTR.CAPACITOR C1O7 ELECTROLYTIC CAPACIT ELECTROLYTIC CAPACIT cl cr09 cll0 cl11 c1l3 RESISTORS R2OI-204 CARBON FILM RESISTOR R2O7_2IO CARBON FILM RESISTOR R217,2L8 CARBON FILM RESISTOR R219,220 CARBON FILM RESISTOR R22I,222 CARBON FILM RESISTOR R223,224 CARBON FILM RESISTOR R225,226 CARBON FILM R

39、ESISTOR Other resfutorg PS ASSEMBLY IAWZ3OO) SEMICONDUCTORS R1I3- I15 CARBONFILM Rt08 R1r7 RESISTOR CARBON FILM RESISTOR Othcr rcsistor8 Ql0l Q 102 Q 103 Ql04 Ql05 D116 DILT Dl18-121 DIODE Dlsl,t52 DIODE TRANSISTOR TRANSISTOR TRANSTSTOR TRANSISTOR TRANSISTOR ZENER DIODE ZENER DIODE 2S8834 nN1203 2S8

40、83 2SC258 2S41048 2SC2468 2SB560 2SA1048 2SC2458 2SAl048 SCJOO lss252 30DF2FC.2 1SS252 RD4.7ESB2 RDlzES82 lss252 lss252 OTHERS CNI CONNECTOR(I3P KPE13 CNz JUMPERCONNECTOR I(PC6 cN3.5,8 CONNECI0R(5P) KPCs CNg JUMPER CONNECTOR KPC6 SP-LCH ASSEMBLY(AWZ3O67 RELAIES RY8OI,EO2 N.ELAY ASRIO26 cotL Q106,TO7

41、 TRANSISTOR QIO8 TRANSISTOR QI51 TRANSISTOR QI52 TRANSTSTOR QI53 TRANSISTOR Dl0l - 104 DIoDE DIOs DTODE Dr06- l13 DIODE Dl14,115 DTODE L80r COIL CAPACITOFS c801.803 AUDIO Flllt CAPACITOR ATI 001 CFTXA4T3Jso c805,806 ELECTR.CAIACITOR CEASR4ruso C814,8I5 CERAMICCAPACITOR CKDYBIMK5M C816.817 CERAMICCAP

42、ACITOR CIIDYB?2KsOO PO Mrrk No. Drrcrlptlon Plrtr No. M!d( No. Darcrlptlon Panr llo. RESISTORS SWITSHES R8O1 METAI OXIDE RSTPMF1OOJ S3OI PUSH SWTTCH SEC8V222L RESISmR $02 PUSH SWITCH SEC8V22S R8O3 METALOXTDE RS2LMF1OOJ RESISTOR RELAY R805,806 METALOXIDE RS2LMF33U RESISmR RY301 RELAY ASRI003 R807,808

43、 CARAONPILM RD1/4PM100J RES|SToRS RESISTOR R3O1_305 CARBON FILM RDLI2PM222 OTHER RESISTOR SPEAKER TERMINAL AKElol? R308309 cARBoN FIlfi RD1/2PM362J 4-P R3ro lloi$lt RDrzPM3ezr RESISTOR R3II CARBONFILM RDI/4PMIOzJ sp-RcH AssEMBLy(AwzsooBr R3r2 :df$lr RDr4pMzzzJ RELAIES RESISTOR RY851862 RILAY AsRl025

44、 Rar4 cAIBoN.FILM RDlzpM36zJ cotl RESISTOR LESr C0IL ATH100r cAPAcrroRs sw ASSEMBLY c851,853 AUDIO FILM CFTXA73J50 SwlTCH CAPACITOR c8s5,8s6 ELEcr?.cArAcrroR cEAsR4?rso s303 swITcH AsDl007 C864,865 CERAMICCAPACIMR CXDYB1O3KsOO C866,867 CERAMICCTPACITOR CrDYM72K500 RESTSTORS PtN JACK ASSEMBLY R8s1 ME

45、TAT oxrDE RslpMFrJ cAPAclroRs RESISTOR c20r-208 CERAMIC CAPACITOR CKDyB:tglKso R8s3 METAL OXIDE RS2LMF10OJ czLl AUDIO FILM CFTXA473J50 RESISTOR CAPACITOR R855,8s6 MFTALOXIDE RS2LMF33U RFSISToR OTHERS R857,858 CARBON FILM RD1/PM100J PIIONO JACK 2p ArGllsl REsrsmR pgoNo jAcr( &p AKBIIs OTHER SPEAKER T

46、ERMINAL AKE1OIT ,1.P FRONT ASSEMBLY (AWZ3O69I SEMICONDUCTORS Q3O1-303 TRANSISTOR RN12O: D3O1-305 LED(RED) AEL1O65 D3O8 IED(P.EDAMBER) AEL1IIG D313,314 DIODE S5s66 D317,318 DIODE 1SS252 D319 ZENERDIODE RDIsESB D320,323 DIODE lSS252 D331.332 DIODE 1SS252 1. 2, J . 4. 5. 6. 4. ADJUSTMENTS Set to the cl

47、ass B mode Wait ten minutes after the power has been turned on. Adjust trrR402 so that the voltage difference between BIAS TP and the output JP wire on the Power L assembly becomes 8,8mV (+ llmV/-3.3mV). Also adjust VR602 on the Power R assembly using the same procedure. Set to the class A mode. Wai

48、t ten minutes. Adjust VR401 so that the voltage difference bet- ween BIAS TP and the output JP wire on the Power L aesembly becomes 137mVf l4mV. Also adjust YR601 on the Power R assembly using the same procedure. Output JP wlre Output JP wlre 7. Check that the voltage difference between BIAS TP and the output JP wire on the Power L assembly is the same as that between BIAS TP on the reinforced L assembly and the output JP wire on the Power L assembly. 8. Check that the voltage d