4-22 Replaceable Parts
R479 RES, 20K, .1%, .125W, THIN FILM R-456-20K
R481,R482 RES, 4.99K, .1%, .125W, THIN FILM R-456-4.99K
R493 RES, 45.3K, 1%, 100MW, THICK FILM R-418-45.3K
R498 RES, .2, 1%, 1W (2512) R-441-.2
R500,R501,R502,R507 RES, 18,5%, 1W 200V, THICK FILM R-437-18
T301 TRANSFORMER TR-314A
TP301-310,311,314,316-318 CONNECTOR CS-985
U301,U321 DUAL FET OPAMP IC-1128
U302,U304,U308,U316,U335 PRECISION BIFET OPAMP IC-1194
U303 IC, QUAD 2 IN AND, 74HCT08 IC-837
U305,U307 IC, VOLTAGE REGULATOR, LM340-12 IC-60
U306,U311,U322,U330 IC, VOLT COMPARATOR LM393D IC-775
U310 MICROPOWER VOLTAGE REGULATOR IC-1152
U312 LOW POWER INSTRUMENT AMP IC-1124
U313 IC, NEG VOLTAGE REG -15V, 500MA,
79M15
IC-195
U314 HIGH SPEED PWN CONTROLLER IC-1120
U315 IC, +5V VOLTAGE REGULATOR,
LM2940CT
IC-576
U317 DUAL ±15V ZERO DRIFT OPAMP IC-1126
U320 IC, POS VOLTAGE REG +15V, 500MA,
78M15
IC-194
U324 IC, CMOS ANAL SWITCH, DG444DY, IC-866
U327 80V 2.5A FULL BRIDGE FET DRIVER IC-1139
U329 IC, VOLT. COMPARATOR, LM311M IC-776
U333 POWER OUTPUT STAGE AUTOMATIC
BIAS
IC-1159
U334,U336 IC, DUAL OP-AMP, LF353M IC-842
VR303,VR310 DIODE, ZENER, 6.8V, MMSZ5235BT1 DZ-100
VR305,VR312 DIODE, ZENER, MM524694 TI DZ-113
VR306,VR307 DIODE, ZENER, 6.0V, BZX84B6V2 DZ-87
VR311 DIODE, ZENER DZ-121
Table 4-6 (continued)
Model 2303B analog board parts list
Circuit designation Description Keithley part no.
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