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TABLE OF CONTENTS
PAGE P AG E
LIST OF I LLU ST R ATIO N S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv VER TICA L AMPL I F I ER . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-38
LIST OF TA BLE S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DELAY LI NE . . . . . . . . . . . . ... . 2-38
SERV ICI N G SA F ETY SUMM ARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi AU XI L IA R Y I NPU T AMPLI.F. I .ER . . . . . . . . . . . . . . . . . 2-39
HIG H - FR EQ UEN CY AMPLI F IER . . . . . . . . . . . . . . . . 2-39
S E CTIO N l--- .GE N ERAL I NF ORM ATIO N
OU T PU AMPLI F I ER . . . . . . . . . . . . . . . . . . . . . . . . . . 2-39
SERVIC E MANU AL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 OU TP U T PR OTECTIO N . . . . . . . . . . . . . . . . . . . . . . . . 2-40
7854 RELATED DOCUMENTATIO N . . . . . . . . . . . . . 1-1 BEAM FINDER/BEAM F I N DER OV ERRID E . . . . . 2-40
I N STA LLATIO N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 HO R IZO N TA L CH ANNEL SW ITC H AN D
I N ITIA L I N S PECT I ON . . . . . . . . . . . . . . . . . . . . . .
1-2 . . . . . P IC K O FF AMPL I F I ER . . . . . . . . . . . . . . . . . . . . . . . . . . 2-40
POWER SO UR C E I NF O RM ATIO N . . . . . . . . . .
1-2 . . . . . H O R IZO N TA L CHANNEL SW ITC H . . . . . . . . . . . . . . 2-40
POWER-UP CO N DITIO N S . . . . . . . . . . . . . . . . .
1-3 . . . . . PIC K OFF AMPL I F I ER . . . . . . . . . . . . . . . . . . . . . . . . . . 2-40
PR ESE T CO N DITIO N S . . . . . . . . . . . . . . . . . . . . .
1-4 . . . . . - DELAY CO MP E N SATIO N (OPTION 02) . . . . . . 2-41
OPERATI N G P OSITIO N . . . . . . . . . . . . . . . . . . . .
1-4 . . . . . HO R IZO N TA L AMPLI F IER . . . . . . . . . . . . . . . . . . . . . . . . 2-41
OPERATI N G TE MPERAT URE . . . . . . . . . . . . . . . . . . . . 1-4 I NPU T AMPL I F I ER / BE AMF I N D ER . . . . . . . . . . . . . . 2-41
TEKTRONIX F I ELD S E R VIC E . . . . . . . . . . . . . . . . . . . . . . . 1-4 D R IVER AMPLI F I ER S AN D ACTIVE PE AK I N G . . 2-42
PACKAGI N G F O R SH I PMEN T . . . . . . . . . . . . . . . . . . . . . 1-4 OU TPUT AMPL I F I ER S . . . . . . . . . . . . . . . . . . . . . . . . . 2-42
OU TP U T SIG NALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42
S E CTIO N 2--T HE OR Y OF O PER ATIO N SAWTOOT H AMPL I F I ER . . . . . . . . . . . . . . . . . . . . . . . 2-42
BLOC K DIAG R AM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 GAT E AMPL I FI ER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-43
D E SC R I P TIO N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 SI N GLE SWEEP R ES ET . . . . . . . . . . . . . . . . . . . . . . . 2-43
DETAI LE D CI R CU IT OPERATION . . . . . . . . . . . . . . . . . . . . . . 2-5 Z-AXIS AN D F OC U S AMPL I F IER . . . . . . . . . . . . . . . . . 2-43
TE K T R ON IX DR AFTI N G CO NVEN TION . . . . . . . . . . 2-5 Z-AXIS AMPL I F I ER . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-43
CA BLI N G . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . 2-5 AU TO- F OC U S C H ANN E L SW ITC H AN D
M OD E SW ITC H AND CALIBRATOR . . . . . . . . . . . . . . . . 2-5 AMPLI F IER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-44
M OD E SW ITC H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 HIG H VOLTAGE POWER SUPPL Y AN D C R T . . . . . . 2-44
CA LI BR ATO R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 POWER TRA N SF O RM ER . . . . . . . . . . . . . . . . . . . . . . 2-44
MAIN I N TER FAC E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 +130 V SUPPLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-44
PLUG-IN I N TE R FAC E . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 C R T HEATER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-44
VERTICA L CH ANNEL SELE CT LOGIC . . . . . . . . . . . 2-8 AN OD E V OLTAG E MULTI P L I ER . . . . . . . . . . . . . . . 2-44
H O R IZO N TA L CH A NNEL SELE CT LOGIC . . . . . . . 2-11 C R T CAT H OD E SUPPLY . . . . . . . . . . . . . . . . . . . . . . . 2-45
MAI NF RAME L OGIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11 CAT H OD E S UPPLY RE GULATOR . . . . . . . . . . . . . . 2-45
H O R IZONTA L L OGIC . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 CO N TROL-G R ID DC RE STOR ER . . . . . . . . . . . . . . . 2-45
Z-AXIS LOGIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15 F OC U S-G R ID DC RE STO RER . . . . . . . . . . . . . . . . . . 2-45
H O R IZO N TA L B I NARY . . . . . . . . . . . . . . . . . . . . . . . . . 2-17 CR T CO N T R OL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2- 5
VERTICA L B I NARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19 CO NVER TER/ R ECTI FIERS . . . . . . . . . . . . . . . . . . . . . . . . 2-46
PLUG-IN BI N ARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21 LI NE I NPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-46
CL OC K GENER ATOR . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23 I NVERTER START . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-47
VERTICA L C H OPPE D BLANK I N G . . . . . . . . . . . . . . 2-25 I NVERT ER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-47
CH OP CO U NTE R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2.6 OV E R - V OL TAG E STOP . . . . . . . . . . . . . . . . . . . . . . . . 2-49
VER TICA L M OD E L OGIC . . . . . . . . . . . . . . . . . . . . . . 2-28 I NVERTER CO N T R OL . . . . . . . . . . . . . . . . . . . . . . . . . . 2-49
TRAC E SEPAR ATIO N . . . . . . . . . . . . . . . . . . . . . . . . . 2-29 POWER UP LOGIC . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-50
T R IGG ER SELE CTO R . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30 LOW - VO LTAG E RE CTIFIERS . . . . . . . . . . . . . . . . . . . 2-50
T R IGG ER CH ANN E L SW ITC H . . . . . . . . . . . . . . . 2-30 L OW - VO LTAG E RE GU LATO R S AN D
LE FT AN D R IG H T TRIGG E R FAN B OA R D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-50
PRE AMPL I F I ER S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31 O PERATIO NAL AMPLI F I ER POWER
T R IGG ER OU T PUT AMPL I F I ER . . . . . . . . . . . . . . 2-31 SUPPL I ES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-51
VER TICA L SIG N AL OU T AMPL I F I ER . . . . . . . . . . . 2-32 +50 V RE GULATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-51
TRIGG ER SELECTOR . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32 -15 V RE GU LATO R . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-51
TRIGG ER CH ANNEL SW ITC H . . . . . . . . . . . . . . . 2-33 +5 V RE G U LATO R . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-53
L E FT AN D R IG H T TRIGG ER +15 V RE GU LATO R . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-53
PRE AMPL I F I ER S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33 -50 V RE GULATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-53
T R IGG ER OU TPU T AMPL I F I ER . . . . . . . . . . . . . . 2-34 FAN CI R C U IT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-53
VER TICA L C H ANN E L SW ITC H . . . . . . . . . . . . . . . . . . . . 2-34 GR ATIC ULE L IG H T SUPPLY . . . . . . . . . . . . . . . . . . . 2-53
C H ANNEL SW ITC H . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-36 FR ON T- P ANEL CO NT R OLS . . . . . . . . . . . . . . . . . . . . . . . 2-53
OUTPU T VOL TAG E RE GU LATO R S . . . . . . . . . . . . . 2-36 KE Y B OAR D SYSTE M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-54
VER TICA L C H ANNEL SE L E CTO R . . . . . . . . . . . . . . 2-37 C L OC K DI VID E R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-54
R IG H T A N D LEFT" C H A NNEL F EEDBESID E . . . . . 2-37 KE Y B OA R D SCANNER . . . . . . . . . . . . . . . . . . . . . . . . 2-54
S E CO N DA R Y S UPPLY REG U LATO R S . . . . . . . . . . 2-37 DATA BU S BUF F E R . . . . . . . . . . . . . . . . . . . . . . . . . . 2-57
VER TICA L PIC K OF F AMPL I F I ER . . . . . . . . . . . . . . . . . . 2-38 KE Y B OA R D STO P /SCA N . . . . . . . . . . . . . . . . . . . . . . 2-57
PIC K OF F AMPLIFI ER . . . . . . . . . . . . . . . . . . . . . . . . . . 2-38 KE Y B OA R D F LAGS . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-57
VOL TAG E /C URREN T R EG U LATO R . . . . . . . . . . . . . 2-38 KE Y B OA R DS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-57
TA"-,- LE
- OF CONTENT%r--~ (CONT)
P AG E P AG E
CO LUMN SCANNER . . . . . . . . . . . . . . . . . . . . . . . . . . 2-58 DATA BU S BUFFER . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-80
R OW SCANNER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-58 R A NDO M ACCESS ME M ORY . . . . . . . . . . . . . . . . . . . . . 2-80
LE D D R I VER S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-58 MEMO RY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-80
VERTICA L A ND H OR IZONTA L SAMPLER . . . . . . . . . 2-58 ADDRE SS BUFFER S . . . . . . . . . . . . . . . . . . . . . . . . . . 2--80
SA MPLI NG BR IDG E . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-58 R AM CO NTRO L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-80
ST RO BE INPU T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-59 I NPUT/OUTPU T DATA BUFFER S . . . . . . . . . . . . . . 2-81
VER TICA L A N D H OR IZONTAL ST R OBE . . . . . . . . 2-59 MEMORY B AC K-UP POWER SWITCH . . . . . . . . . 2-81
VOLTAG E FOLL OWERS . . . . . . . . . . . . . . . . . . . . . . . 2-59 WR ITE PR OTECT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-81
CHANNEL S WITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-59 RE ADOUT ACQU I RE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-81
D ECO UPLI NG F I LTER S . . . . . . . . . . . . . . . . . . . . . . . . 2-60 TIMER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-86
DIGITIZER CO NTR O L L OGIC . . . . . . . . . . . . . . . . . . . . . . 2-60 TIME-SLOT CO UN T ER . . . . . . . . . . . . . . . . . . . . . . . . 2-86
DATA/C LOC K SE LE CT . . . . . . . . . . . . . . . . . . . . . . . . 2-60 CHANN E L. CO UN TER . . . . . . . . . . . . . . . . . . . . . . . . . . 2-87
BU S CO NTR OL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-61 CO LUMN A N D R OW DATA SWITCHE S . . . . . . . 2-90
ADDRE SS SELECT . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-62 CO LUMN A N D R OW D ECODER S . . . . . . . . . . . . . 2-91
I NTE RN AL ACQUI RE ADDRE SS G ENER ATOR . . 2-63 CHAR ACTE R EN CODER S . . . . . . . . . . . . . . . . . . . . . . 2-91
ADDRE SS G ENER ATOR . . . . . . . . . . . . . . . . . . . . . . . . . . 2-63 POSITIO N ADDRESS CO UNTE R . . . . . . . . . . . . . . . 2-91
CO UN TER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-63 BU FF E R S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-92
MOD E WO RD LATCH . . . . . . . . . . . . . . . . . . . . . . . . . 2-63 RE ADO UT BU S CO NT ROL . . . . . . . . . . . . . . . . . . . . 2-92
W ORD BU F F ER . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-63 VERTICA L/H ORIZONTA L DISPLAY
EN D-OF-COUN T DETECTOR . . . . . . . . . . . . . . . . . . . 2-63 AN D CO NTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-92
WO R D/CLOC K SELECT . . . . . . . . . . . . . . . . . . . . . . . 2-64 BL OC K D ESC RIP T IO N . . . . . . . . . . . . . . . . . . . . . . . . . 2-93
W OR D ADDRE SS CO UN TER . . . . . . . . . . . . . . . . 2-64 DIS PL AY D/ AND AMPLI FI ER . . . . . . . . . . . . . . . . . 2-109
ADDRE SS OUTPU T . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-64 HORIZONTA L A N D VERTICA L D/
DIGITIZER CLOC K . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-65 CO NVER T ER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-109
CLOC K/SOUR CE S ELECT . . . . . . . . . . . . . . . . . . . . . 2-65 H ORIZONTA L C URR E NT SUMMER A N D
CLOC K DE LAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-66 AMPLI FI ER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-109
SOUR CE RESTART . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-66 VE RTICAL CURRENT S UMMER A N D
GATED OSCI LLATO R . . . . . . . . . . . . . . . . . . . . . . . . . 2-66 AMPLIFIER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-111
BURST CO UNT ER . . . . . . . . . . . . . . . . . . . . . 2-67 VERTICA L A N D H O RIZONTA L VE CTOR
DMA CO NTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-67 G ENER ATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-111
BU S RE QUE ST LOGIC . . . . . . . . . . . . . . . . . . . . . . . . 2-68 OUTP UT SELECTO R . . . . . . . . . . . . . . . . . . . . . . . . . . 2-113
BU S GRANT L OGIC . . . . . . . . . . . . . . . . . . . . . . . . . . 2-68 Z-AXIS DRIVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-113
DM A TI M I NG LOGIC . . . . . . . . . . . . . . . . . . . . . . . . . 2-68 ANALOG SCOPE CO NTROL LOGIC . . . . . . . . . . . . 2-113
DIGITIZ E R SWEEP CO UN TER . . . . . . . . . . . . . . . . . . . . . 2-69 G . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-113
ACQU I RE WORD RE GIST E R . . . . . . . . . . . . . . . . . . . 2-7 THE IEEE 488-1978 STAN DA RD . . . . . . . . . . . . . 2-114
S WEE P CO UNTE R . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-70 THE H ANDS HAKE PROC ESS . . . . . . . . . . . . . . . . . 2-114
GATE S ELECT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-70 GPIA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-117
CO MPLETE SWEEP DETECTOR . . . . . . . . . . . . . . . 2-70 MPU I NTERFAC E . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-117
ACQU I RE STOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-70 GPI B I NTERFAC E . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-117
DIGITI Z ER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-71 CO NTRO L A N D TI MI NG LOGIC . . . . . . . . . . . . . .2-117
CO MP ARATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-71 GPI B ADD RE SS SELECTOR . . . . . . . . . . . . . . . . . .2-120
APPROXIMATION G ENER ATOR . . . . . . . . . . . . . . . . 2-71 RE AR PANEL CO NNECTOR . . . . . . . . . . . . . . . . . . . . .2-120
D/ CO NVER TE R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-72 MOTHER B OA RD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-120
APPROXIMATIO N DATA LATC H . . . . . . . . . . . . . . . 2-72 AUXI LIARY RE G ULATO R . . . . . . . . . . . . . . . . . . . . . . . .2-124
VO LTAG E REFER ENCE . . . . . . . . . . . . . . . . . . . . . . . . 2-74 +12 V OLT RE GULATO R . . . . . . . . . . . . . . . . . . . . . . 2-124
C LOC K CO NDITIONE R . . . . . . . . . . . . . . . . . . . . . . . . 2-74 +5 VOLT RE GULATOR . . . . . . . . . . . . . . . . . . . . . . . 2-124
SIG NAT URE A NALYSIS . . . . . . . . . . . . . . . . . . . . . . . . . . 2-74 -5 VOLT SWITCH I N G . . . . . . . . . . . . . . . . . . . . . . . . 2-124
MIC RO PR OC ESSOR AND CO NTR OL . . . . . . . . . . . . . . 2-75 EXC ESSIVE CURREN T STOP . . . . . . . . . . . . . . . . . 2-125
CLOC K . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-75 FAULT PROTECTION . . . . . . . . . . . . . . . . . . . . . . . . . 2-125
I N TERR U PTS AND CO NTR OL . . . . . . . . . . . . . . . . . . 2-76
DATA BU S TRAN SC E I VER S . . . . . . . . . . . . . . . . . . . 2-76
TRAN SC EI VER CO NTR OL . . . . . . . . . . . . . . . . . . . . . 2-77 SECTIO N 3-MAINTENANCE
CO NTR OL BU S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-77 PREVEN TATI VE MAI NTEN ANC E . . . . . . . . . . . . . . . . . . . . . . 3-1
C RU O U TP UTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-77 CA BI NET PANEL REMOVAL . . . . . . . . . . . . . . . . . . . . . . . 3-1
ADDRE SS DECODER . . . . . . . . . . . . . . . . . . . . . . . . . 2-78 CLE AN I NG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
ADD RE SS BU FFERS . . . . . . . . . . . . . . . . . . . . . . . . . . 2-78 EXTERIO R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
RE AD O NL Y MEMO RY . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-78 CRT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
ADDRE SS BU S BUF F ER . . . . . . . . . . . . . . . . . . . . . . 2-78 INTERIOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
MEMORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-78 V IS UAL I NSPE CTIO N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
R OM CO NTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-79 S EM ICO N DUCTOR CHE CKS . . . . . . . . . . . . . . . . . . . . . . . 3-2
FP LA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-80 PERIODIC ELECTRICAL AD JU STMENT . . . . . . . . . . . . . 3-2
TABLE OF CONTEN (CONT)l
P AG E PAG E
TRO UBL ES H OOTI N G . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 PAR T I- PERFORMANCE C HE C K . . . . . . . . . . . . . . . . . . . . 4-21
TRO UBLE S H OOTI N G AIDS . . . . . . . . . . . . . . . . . . . . . . . . 3-2 I N D E X TO PERF ORM AN C E C HE CK PROCEDURE . . 4-21
DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 P E R FOR M AN C E C HE C K P OW ER-UP S EQUEN C E . . 4-21
CI R CU IT BOA R D I LLU STR ATIO N S . . . . . . . . . . . . . . 3-3 . Z-AXIS AN D DIS P LAY . . . . . . . . . . . . . . . . . . . . . . . . 4-22
SERV IC E IDE N TI F ICATIO N TAG . . . . . . . . . . . . . . . . . 3-3 . CA L I BRATOR A N D OU T PU T SIG N AL S . . . . . . . . . 4-23
T R OUBLESH OOTI N G CH AR T . . . . . . . . . . . . . . . . . . . 3-3 C. TRIGG ER SYST E M . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-29
T R OUBLESH OOOTI N G TREE . . . . . . . . . . . . . . . . . . . 3-3 D. H OR IZO N TA L SYST EM . . . . . . . . . . . . . . . . . . . . . . . . 4-31
AD JU ST MEN T AN D T E ST POINT LOCAnONS . . 3-3 . VER TICA L SYST EM . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34
CO MP ONEN T CO L OR CODI N G . . . . . . . . . . . . . . . . . 3-3 F . VER TICA L A N D HO R IZO N TA L P IC K O FF
S EM ICO N DU CTO R LE AD CO NF IG UR ATIO N S . . . . 3-3 SYST EM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-37
MULTI-PIN CO NNE CTO R S . . . . . . . . . . . . . . . . . . . . . . 3-3 PAR T 11---ADJU ST MEN T AN D PERF O RM AN C E
AN ALOG T R OUBLE S H OOTI N G E QU I PMENT . . . . . . . . 3-3 C HE C K . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-42
DIGITA L T R OUBLE S H OOTI N G E QU I PMEN T . . . . . . . . 3-7 I N D E X TO ADJU ST MEN T AN D PE R F OR M AN C E
DIGITA L T R OUBLE S H OOTI N G TEC HN IQ UE S . . . . . . . 3-9 C HE CK PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-42
PR ES ET CO N DITIO N S . . . . . . . . . . . . . . . . . . . . . . . . . 3-10 ADJU ST MEN T AN D PERFORM AN C E C HE C K
ANAL OG TROUBLESHOOTING T E C HN IQ UES . . . . . . 3-10 P OWE R- UP S E QUEN C E . . . . . . . . . . . . . . . . . . . . . . . . . . 4-43
1 . C HE C K CO N T R OL SETTI N GS . . . . . . . . . . . . . . . 3-10 . POWER SUPPLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-44
2. C HE C K ASSOCIAT E D EQU I PMEN T . . . . . . . . . 3-10 . Z-AXIS AND DIS PLAY . . . . . . . . . . . . . . . , . , 4-47
3. VIS U AL CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10 C. CA L I BR ATOR A N D O U T PUT SIG N AL S . . . . . . . . . 4-54
4. CHE C K I N ST RUMENT AD JU STMEN T . . . . . . . 3-10 D. T R IGG ER SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-60
5. ISOLATE T R OUBLE TO CI R CU IT . . . . . . . . . 3-10 F . VER TICA L SYSTE M . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-71
6. CHECK VOLTAGE S AN D WAVEF ORMS . . . . . 3-10 GA . DIS PL AY SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . 4-79
7. CHE CK I N DI V ID U AL CO MP O NEN TS . . . . . . . . 3-11 G B . DIS PLAY SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-83
8. REP AI R A N D AD JU ST THE CI R CU IT . . . . . . . . 3-11 GC . DIS P LAY SYST E M . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-87
T R O UBLE S H OOTI N G THE H IG H - EF FICI EN CY . VERTICA L AN D HOR IZO N TA L P IC K OFF
POWER -S UPPLY UN IT . . . . . . . . . . . . . . . . . . . . . . . . 3-11 SYSTE M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-90
G ENER AL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11 . CA LCU LATO R K EYB OA R D . . . . . . . . . . . . . . . . . . . . -1 4
PREL I M I N ARY PR OC E DURE . . . . . . . . . . . . . . . . . . . 3-12
TRO UBLE S H OOTI N G PR OC E DURE . . . . . . . . . . . . . 3-12
CO RRE CTI VE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . 3-16 S E CTIO N 5----IN STRUMEN T OPTIO N S
OBTAI N I N G R EP L AC EMEN T PAR TS . . . . . . . . . . . . . . 3-16 OPTION 02 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
SO L DER I N G TEC HN IQ UE S . . . . . . . . . . . . . . . . . . . . . . . 3-17 OPTION 03 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
CO MP ONEN T REM OVAL A N D REPLAC EMENT . . . . 3-18 OPTION 78 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
DIS PLAY UN IT K IC K STA N D . . . . . . . . . . . . . . . . . . . 3-18 OPTION OD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
POWER -S UPPLY UN IT REM OVAL . . . . . . . . . . . . . 3-18 OPTION 2D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
POWER -S UPPLY UN IT I N STA LL ATIO N . . . . . . . . . 3-18 OPTION 1S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 5-1
CAT H OD E - R AY T UBE REM OVAL . . . . . . . . . . . . . . 3-20 OPTION 2S . . . . . . . . . . . . . . . . . .. . . . . . . . .. . .. . .. . . 5-1
CAT H OD E - R AY T UBE REPLACEMENT . . . . . . . . . 3-21 POWER CO R D OPTIONS . . . . .. . .. . .. . .. . . . . .. . . 5-2
CI R C U IT B OA R DS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21 WH IC H O PTIO N S DO E S YO UR 7854 HAVE? . . . 5-5
PLUG-IN I N TER F ACE CO NNE CTO R S . . . . . . . . . . . 3-27
S EM ICO N D U CTO R S . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-27
I N TERCO NNE CTI N G PI N S . . . . . . . . . . . . . . . . . . . . . 3-32
PU SHBUTTO N SWITCHES . . . . . . . . . . . . . . . . . . . . . 3-33 S E CTIO N 6- -R EP LAC E A BLE ELE CTRICA L PAR TS
GR ATIC ULE L IG H T BULB S . . . . . . . . . . . . . . . . . . . . 3-33
P OWER -T R AN S F ORMER . . . . . . . . . . . . . . . . . . . . . . 3-33
ADJUSTMENT A FTER REPAI R . . . . . . . . . . . . . . . . . 3-33 S E CTIO N 7---DIAG R A M S AN D CI R C U IT BOA R D
I LLU STRATIO N S
S E CTIO N 4--CA LI BR ATIO N
N G T HE S E PR OC E D URE S . . . . . .
U SI . . . . . . . . . . . . 4-2 S E CTIO N 8---REPLAC E ABLE ME CH AN ICAL P AR TS
PER F ORM AN CE CHE CK S UMM AR Y . . . . . . . . . . . . 4-2
AD JU ST MENT I N TE R VAL . . . . . . . . . . . . . . . . . . . . . 4-17
TEK T R O N IX F I EL D S ERV IC E . . . . . . . . . . . . . . . . . . . 4-17 CH A N GE I NF ORM ATIO N
'TEST E QU I PMEN T RE QU I RE D . . . . . . . . . . . . . . . . . . . . 4-17
S PE CIAL F IXT URE S . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
T E ST E QU I PMEN T ALTE RN ATI VE S . . . . . . . . . . . . 4-17
U
2-29 /t relationshi ps for the Auto-
2-1 B lock Diag ram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Focus C ha nn el Switch . . . . . . . . . . . . . . . . . . . . . . . . 2-44
2-2 M ode Switch/Calibr ator bloc k diagram . . . . . . . . . . 2-7 2-30 Detaile d block diagram of the Converte r/
2-3 ( ) Logic Diagram of t he Vertical C h a nn el R ectifie rs circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-46
Switch Logic on the M ain Interface. ( ) Input/ 2-31 ( ) R ep r ese ntation of Inverter stage. I dealize d
waveforms of () total Inverter current, IC,
output table of the V ertical Channel Switch
logic on the M ain Interface . . . . . . . .. . . . . . . . . . . . . 2-9 (C) Voltage across CR41 and (D) Voltage across
2-4 Detailed b lock diagram of the M ainframe primaries of 10 a nd 35 . . . . . . . . . . . . . . . . . . . . . 2-48
L ogic circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10 2-32 Detailed Block Diagram of the Converter/
2-5 Breakdown of separate stages within Rectifiers circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-52
Horizontal Logic IC (U116) showing inputs 2-33 Detailed Block Diagram of the Keyboard
an d output for each stage . . . . . . . . . . . . . . . . . . . . 2-11 system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-55
2-6 () Logic diag ram fo r Swee p Lockout stage; 2-34 Ti m ing Diagram fo r t he K eyboard System . . . . . 2-56
() Ta ble of i nput/outpu t combi nation s . . . . . . . . 2-12 2-35 Co mp a r ison se qu ence of Successive
2-7 ( ) Logic diagram fo r Swee p Loc kout stage; Approximatio n Register for two ra n dom
( ) Ta ble of input/output com bi nations . . . . . . . . 2-13 voltage sam ples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-73
2-8 ( ) L ogic d iagram fo r Alternate P ulse 2-36 Cloc k Pu lse delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-74
Gene rator stage; ( ) Ta ble of in put/output 2-37 Timi ng r elations hips of the fo ur ph ase,
combinations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14 3-MHz clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-75
2-9 Input an d output p i n s for -Axis Logic 2-38 Location of Readout words on the crt
IC (U190) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15 identifying the originating p lug-in a nd
2-10 ( ) Logic d iagram for -Axis Logic stage; c hannel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-82
() Table of input/output combinations . . . . . . . . 2-16 2-39 Character Selection M atrix for the 7854
Readout Acquire system . . . . . . . . . . . . . . . . . . . . . . . 2-83
2-11 Input and o utput p ins for H orizontal Binary
IC (U4358) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17 2-40 Typical readout d isplay where only channel 2
2-12 () Logic d iagram for Horizontal Binary stage; of the Right V ertical and H orizontal units
() Table of input/output combinations . . . . . . . . 2-18 is d isplayed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-84
2-13 Input and output p ins for Vertical B inary 2-41 Detailed Block Diagram of the Rea dout
IC (U 52) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19 Acquire system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-85
2-14 () L ogic d iag ram fo r Vertical B inary stage; 2-42 Output waveforms of Time r stage . . . . . . . . . . . . . 2-86
() Table of input/output combinations . . . . . . . . . . 2-20 2-43 Time relatio nsh i p of the Time Slot (TS)
2-15 Input and output pins for the p lug-in binary pulses produced by U2320 . . . . . . . . . . . . . . . . . . . . 2-87
IC (U82) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21 2-44 Typical encoding scheme for Voltage-Sensing
2-16 () L ogic diagram for Plug-in Binary stage; plug-in unit . Coding shown for calibrated
() I nput/output tables for U72 and entire deflection factor of 100 m icrovolts (inverted) . . . 2-89
stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22 2-45 Idealize' current waveforms of : () Row
2-17 ( ) Diagram of clock generator stage; Analog data . () Column A nalog d ata . . . . . . . . . 2-90
( ) I dealized waveform for clock . . . . . . . . . . . . . . . 2-24 2-46 W aveform Data Flow . . . . . . . . . . . . . . . . . . . . . . . . . . 2-94
2-18 ( ) Logic diag ram for Vertical Chopped 2-46 C haracter Data F low . . . . . . . . . . . . . . . . . . . . . . . . . . 2-96
B lanking stage; ( ) Table of input/output 2-47 7854 Characte r Set . . . . . . . . . . . . . . . . . . . . . . . . . . 2-100
combinations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25 2-48 Crt Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-110
2-19 Idealized waveforms for Vertical Chopped 2-49 Display of Character on crt . . . . . . . . . . . . . . . . . .2-112
Blanking stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26 2-50 GPIB Three W ire H andshake state d iagram . . . 2-115
2-20 ( ) I nput and o utput p ins for C hop counter 2-51 GPIB Handshake flowchart . . . . . . . . . . . . . . . . . . .2-116
IC (U22); ( ) I dealized waveforms for Chop 2-52 GPIB timing d iagram . . . . . . . . . . . . . . . . . . . . . . . . . 2-119
Counter stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27 3-1 Color code for resistors and capacitors . . . . . . . . . 3-4
2-21 L ogic diagram of Chop Counter stage . . . . . . . . . 2-28 3-2 Semiconductor lead configurations . . . . . . . . . . . . . . 3-5
2-22 L ogic d iagram of Vertical M ode Logic stage . . . 2-29 3-3 Orientation of multi-pin connector hol ders . . . . . . 3-6
2-23 () L ogic diagram of Trace Separation stage; 3-4 Analog Test B oard (067-0912-00) inter-
( ) Table of input/output combinations . . . . . . . . 2-30 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
2-24 Detailed block diagram of the Trigger 3-5 Typical d igital test/troubleshooting
Selector circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31 configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
2-25 Detaile d block diagram of the Trigge r 3-6 Current se nsing wavefo rm at R84 . . . . . . . . . . . . . 3-13
Selector ci rcu it . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33 3-7 Locatio n of sc rews used fo r d isch arging
2-26 V ertical Amp lifie r detailed block d iag ram . . . . . . . 2-35 li ne storage ca pacito r s . . . . . . . . . . . . . . . . . . . . . . . . 3-14
2-27 () F unctional d iagram of V ertical Channel 3-8 Current waveform of 30 s howing burst
Switc h; ( ) Table showing signal d istribution operation at line voltage of about 60 volts . . . . 3-15
by the V ertical Channel Switch . . . . . . . . . . . . . . . . . . 2-36 3-9 Current waveform at 30 for n ormal inverter
2-28 U 150 internal circuitry representation . . . . . . . . . . 2-39 operation at line voltage of 115 volts . . . . . . . . . 3-16
. 1 -)NS (CONT)
3-10 Waveform at 34 on the A23-Inverter b oar d 3-17 H ypcon assembly removal and replacement . . . . 3-30
with t he line voltage at about 20 volts . . . . . . . . 3-16 3-18 Coaxial en d -lead connector assembly . . . . . . . . . . 3-32
3-11 R ecommended desol d ering seq uence for 3-19 E xplo ded view of circuit b oard pin and
m ulti-pin devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17 ferrule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-32
3-12 U se of the Display U nit k ickstand . . . . . . . . . . . . . 3-19 3-20 Correct p rocedure for pushbutton switch
3-13 Power Supply Unit securing screws and removal and replacement . . . . . . . . . . . . . . . . . . . . . . 3-34
service identification tag location . . . . . . . . . . . . . . 3-20 4-1 Typical d isplay when checking - Phase
3-14 Location of securing screws used for All- relationships . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-33
Main Interface b oard removal . . . . . . . . . . . . . . . . . 3-23 4-2 Typical d isplay when checking - Phase
3-15 Correct p lacement of power t ransistor and r elationships . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-69
mounting h ardware in rear h eatsink . . . . . . . . . . . 3-25 5-1 Location of Option i dentification tags . . . . . . . . . . . 5-5
3-16 IC code number locations . . . . . . . . . . . . . . . . . . . . . 3-28
1-1 P ower-Cord Color Conductor I d entificatio n . . . . . . 1-2
1-2 Power-Cord And Plug Identification
Infor mation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1-3 Self-Test Fault Codes . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2-1 Common L ogic Gates Illustrations . . . . . . . . . . . . . . 2-6
2-2 /Output Combinations for T rigger
Channel Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32
2-3 Input/Output Combinations for T rigger
C hannel Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34
2-4 R OM E N ABLING . . . . . . . . . . . . . . . . . . . . 2-79
2-5 Sta nd a r d R eado u t F or mat . . . . . . . . . . . . . . . . . . . . . 2-84
2-6 C h a n nel Ad dr ess Co de . . . . . . . . . . . . . . . . . . 2-88
2-7 Signal Line Description Table . . . . . . . . . . . . . . . . . 2-101
2-8 Mother Board Signal Definitions . . . . . . . . . . . . . . 2-121
3-1 Self-Test Fa u lt Cod es . . . . . . . . . . . . . . . . . . . . . . . . 3-9
3-2 Reco m men d e d P owe r S upp ly Troubles hooti n g
Se qu e n ce . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
3-3 Typical Power-Supply R esistance . . . . . . . . . . . . . . . 3-13
3-4 Burst V oltage Test P oints . . . . . . . . . . . . . . . . . . . . . 3-14
3-5 IC Code/Shunt R esistor Replacement Values .. 3-28
4-1 Cali br atatio n P roce dur e Electives . . . . . . . . . . . . . .. . 4-1
4-2 P erformance Check S ummary . . . . . . . . . . . . . . . . .. . 4-2
4-3 Test Equipment . . . . . . . . . . . . . . . . . . . . . . . 4-17
5-1 Option Information Locator . . . . . . . . . . . . . . . . . . .. . 5-2
V
AFETY ""UMMARY
7854 FEATURES
T he TEKTRONIX 7854 Oscillosco pe wit h Waveform Calc u lato r combi nes the features of h ig h -perfo rm ance plug-in oscilloscope with
wavefo rm -o rie nte d ded icated-f unctio n digital processo r.
The wave form processor provides equ ivalent-time sa mp led digitizi ng of wavefo rm s to 400 mega h ertz equ ivalent-ti me ba nd wi dth. The
pr ocesso r ca n be operated from either key boa rd (f ront- panel meas u reme nt key boa rd o r detac ha ble W aveform Calc ulato r keyboa rd) or
remotely over t he GPI B (Ge neral Purp ose Inte rface Bus) .
Pr og ramming, co nsisting of se r ies of commands stored fo r late r exec utio n, is availa ble to si mp lify meas ur em e nts wh ic h mu st be r epeate d. --
Ed iting a nd executio n is co ntrolled eit her from t he W aveform Calc ulato r o r t he G PI B.
GENE, AL INFO ~1~'*AAAATION
This sectio n co n tai n s basic d escri p tion of t h e Service Manual content, information on instr u ment installation, p ower
a n d p ower cord requi r ements, operating temperat u re consi d erations, p ac k aging fo r s h i p me nt, a nd instr u ment r e p air
services .
S ERV IC E M A NU A L Section 7-----Diagrams an d Ci r c u it B oa rd Ill u strations
incl u d es detailed ci r cuit sc h e m atics, locations of
Th e followi n g is b rief desc r i ptio n of t h e infor mation
contai n e d in th is man u al . assem b le d boa r ds wit h in t h e instrument, voltage and
waveform information, ci rc u it b oard com ponent
locators, and locations of a dju stments to ai d i n t h e
p erformance of t h e A dj ustment and Perfo r m ance
c h ec k portion of t h e Cali b ration proce d ure .
Section 8--- R e p laceable M ec h a n ical P arts incl ud es
informatio n necessary to or d e r re p laceable
m ec h anical parts a nd s h ows exp loded drawings w h ic h
i d e n tify assemblies .
Section 1----Ge n eral Info r mation contains i n stallation 7854 RE LATED DOC UMEN TATIO N
instr u ctio n s, o p e rating tem p erature conside r atio n s,
In a d d ition to t h e 7854 Service Manual, ot h er pu blicatio n s
Te k tronix F iel d Service, and instrument p ac k agi n g a re availa b le ; t h ey incl ud e t he O pe r ato rs Manual,
information . Diag n ostic Manual Pac kage and Data S h eets .
Section 2--=-Th eory of Operation contains basic b loc k Op e rato r s Manual
d iagram d escri p tion and d etailed circuit a n alysis t h at
T h e 7854 O p e rators man u al co n tai n s i n stallation
may b e useful for servici n g or o p erating t h e i n st r uctio n s, s p ecificatio ns a n d operating info r matio n fo r
instrument . t h e sco p e dis p lay, meas ur ement a nd wavefo r m calculator
k ey boa rd , G PI B , o p tio n s a nd command lang u age .
Sectio n 3-- .-Maintenance describes routine a n d
corrective maintena n ce p roce du res wit h detailed Diagnostic Manual Pac k age
inst ru ctio n s fo r tr ou b les h ooting t h e analog ci r c u its . T h e i n formatio n necessary fo r t r o ub les h ooti ng t h e digital
Diagnostic tro ub les h ooting equipment an d proce d ures po r tio n of t h e 7854 Oscillosco p e consists of seve r al
can b e p u rc h ase d sepa r ately, o r r efe r repair to yo u r in d ivid u ally p art n um bere d d oc u ments com b ined in an
Te ktronix F iel d Office . ord e r ly fas h io n to pr o du ce "Diagnostic Manual
P ac k age" .
Section 4.---Cali b ratio n contai n s proce du res to c h ec k
"7854 Diag n ostic T rou b les h ooting U sing 067-0911-
t h e o p e r atio n al p erformance an d electrical
Diag n ostic Test I n te r face" is t h e pr i nci pal manual a nd is
c h a r acteristics of t h e i n str u me nt . perfo r ma n ce bo und i n 3- r i n g b i nd e r to ena b le insertion of t h e ot h e r
c h ec k s u mma r y p r ovi d es c r oss r efe r e n ce b etwee n su pp ort d oc u ments at t h ei r a p pro p riate locations . Ot h er
t h e specifications an d relate d a dju stment proce d u res . s upp ort d oc um ents i n cl u d e su pp le me n t manuals an d
d ata s h eets .
Section 5-I n strument Options contains d esc r iption
of available optio n s and locations of i n co r porate d Supple ment M anuals . T h e s u p p lementary man u als
information fo r t h ese o p tions . "7854 Sig n atu re A n alysis Ta b les U si n g 067-0911-
Diagnostic Test Interface" ( P a r t n umbe r 070-2922- )
an d "Test P roce d ures fo r 7854 Diag n ostic T r ouble-
Sectio n 6-- R e p laceable E lectrical P a rts contains s h ooti n g U sing 067-0911- Diagnostic Test Interface"
information necessary to or d er re p laceable p a r ts a nd ( P a rt n u mb er 070-2875- ) s h o u ld be i n se rted be h i nd
assem b lies related to t h e electrical f u nctions of t h e t h e Pr ima ry Manual's "Sig n at ur e Ta b les" a nd "rest
i n strument . Pr oced u res" ta b s res pectively .
1-1
Th e manual for t h e "Diagnostic M emory B oard (067- P owe r Cord Infor m ation
0961- )" co ntai n s service informatio n fo r t h e special
p owe r co rd wit h t h e a ppr o pr iate pl u g configuratio n is
circuit b oa rd containing t h e d iag n ostic fir m wa r e fo r
tro ub les h ooti n g t h e 7854 . s upp lie d wit h eac h instrument . For your co n venie n ce t h e
color-cod ing of t h e p owe r cor d co n d uctors is give n i n
Ta b le 1-1 . Also, s h ould you re qu i re powe r -cor d p l u g
Data S heets ( F or Support- R elated Test F ixtures) . ot h er t h an t h at s upp lie d , refe r to t h e Powe r -Co rd a nd
Data s h eets fo r d iag n ostic relate d h a rd wa re include t h e P l u g I d e n tification Table 1-2 .
following :
7854 Analog Test B oar d (067-0912-00)---See
application u nder Analog Tro ub les h ooting Equ i pm e n t
in Section 3, Mainte n a n ce .
7854 E xte nd er B oa rd , 44- P in (067-0913-00)---See
a pp licatio n un d e r Digital Tro ub les h ooting Eq u i p ment
i n Section 3, M aintenance .
7854 Extender B oa rd , 80- P i n (067-0914-00)_--See
a pp lication u n d e r Digital Tr oubles h ooti n g Equ ipment
i n Sectio n 3, Maintenance .
7854 E xten d er B oa rd , 124-Pin (067-0915-00)--See
a pp lication u n d er Digital Trou b les h ooting Eq ui p me n t
i n Section 3, M aintenance .
INSTALLATION
I N ITIA L I N S PE C TIO N
Th is inst ru ment was inspecte d bot h mec h anically and
electrically b efo r e s h ipme nt f r om t h e factory to b e fr ee of
mars or scratc h es and to meet o r exceed all electrical
T is instrument oper ates fr om single-ph ase
h
s p ecifications . U pon recei p t, i n spect t h e i nstrume n t for
any ph ysical d amage w h ic h may h ave been i n c urr e d in p ower sou rce, and h as detac hable three-
wire power cord with two- pole, three-
t ra n sit . - Then, refer to t h e Pe r fo r mance C h ec k P roce dur e
terminal gro u n ding-typ e p l ug. Th e voltage to
i n t h e Cali br atio n sectio n of t h is Manual to ve r ify t h e
gro un d (ea rth) fr om either pole of th e p owe r
electrical performa n ce of t h e i nst rum e n t . If mec h a n ical
source m ust not exceed th e maxim um rated
d a mage or pe r formance d eficiencies a re fo u n d , contact
operating voltage, 250 volts.
you r local Te ktronix F iel d Office or representative .
Before making connection to th e p owe r
P O W ER SO UR C E INFORMATION
so urce, determine th at th e instrume nt is
T h is i n st ru ment will o p e rate from eit h e r 115-volt or a djuste d to match th e oltge of the power
230-volt no m i n al li n e-voltage so u rce, 48 to 440 h ertz . so urce, an d h as suitable plug (two-p ole,
three-te rminal, gro un ding type) .
Operating Voltage
Th is inst rume n t is safety class 1 equipment
Th e L I NE VO LTAG E S E LECTO R switc h (located on t h e
(IEC* designation). // accessible conductive
rea r pa n el of t h e 7854 Oscillosco pe mainf r ame) allows
selection of 115-volt o r 230-volt n ominal li n e voltage parts a r e directly connecte d th ro ugh the
gro un ding con du ctor of th e power cor d to th e
o p e r atio n . To select t h e correct nominal line voltage, fi r st
gro u nding contact of th e p ower cor d.
c h a n ge t h e p ower cor d and p l u g to matc h t h e p owe r -
Th e refore, th e power p lug must only be
so u rce rece p tacle (if necessa ry) . T h en, u se small
in se rted in mating receptacle wit h
sc r ewdrive r to move t h e L I NE V O LTAG E S ELE CTO R
groun ding contact. Do not defeat th e
switc h to t h e desi r ed r ange .
gro unding con nectio n . A n y interruption of th e
groun ding connection can create an electric
CA U TIO N shock h aza rd.
For electric s hock pr otection, th e g rounding
To pr event damage to the instrument, always
ch eck th e settings of th e L INE VO L TAGE connection must b e m ade before ma king
connection to th e instrument's inpu t or
S ELECTO R switch locate d on th e rear p a nel
of th e 7854 Oscilloscop e mainframe befo re ou tput terminals .
co nnecting the instrum en t to th e line-voltage
source.
1-2
TA BLE 1-2
P ower-Cord And Pl ug Identificatio n I n fo r matio n
M emory Back-up P ower Wh en power is applie d t he followi n g
i nd icato r s will lig h t : P OWER, selecte d
Two fe male bana na j ac ks (on th e rear panel of the 7854
positions of t h e a nd TRIGGER SO U RC E
Oscillosco pe mainframe) allow a pp lication of about 6.25
switches, and all selected i nd icators on th e
V d o (0 .7 m axim um) to provide back-up power for the