Keithley 2303, Service Manual, Page: 58 / 104

4-6 Replaceable Parts
R245 RES, 34K, 1%, 100MW, THICK FILM R-418-34K
R246,R270,R272 RES, 475, 1%, 100MW, THICK FILM R-418-475
R248 RES, 470, 5%, 125MW, METAL FILM R-375-470
R249 RES, 5.11K, 1%, 100MW, THICK FILM R-418-5.11K
R251 RES, 49.9K, 1%, 100MW, THICK FILM R-418-49.9K
R253 RES, 6.04K, 1%, 100MW, THICK FILM R-418-6.04K
R260 RES, 4.02K, 1%, 100MW, THICK FILM R-418-4.02K
R263 RES, 20K, 1%, 100MW THICK FILM R-418-20K
R264 RES, 24.9K, 1%, 100MW, THICK FILM R-418-24.9K
R278 RES, 15k, 1%, 100MW, THICK FILM R-418-15K
R280 RES, 249K, 1%, 100MW, THICK FILM R-418-249K
R289 RES, 332, 1%, 100MW, THICK FILM R-418-332
R290 RES, 909, 1%, 1W, THICK FILM R-418-909
RT102 THERMISTER, PD=7MW/DEG C, 1500V,
613.74K RT-8
RV100 METAL OXIDE VARISTOR VR-7
RV102 VARISTOR VR-14
S100 SWITCH, PUSHBUTTON (6 POLE) SW-466
TP100-109,111,112 CONNECTOR CS-985
U100 RS-232 LINE DRIVER/RECEIVER IC-1129
U101,U128 IC, VOLT. COMPARATOR, LM311M IC-776
U102 12-BIT VOLTAGE OUTPUT DAC IC-1130
U103 IC, +5V VOLTAGE REGULATOR,
LM2940CT IC-576
U104,U115 HIGH SPEED PWM CONTROLLER IC-1119
U106 IC, 8-CHAN ANA MULTIPLEXER,
DG408DY IC-844
U107 LOW NOISE OPAMP IC-1127
U108 IC, 8 STAGE SHIFT/STORE, MC14094BD IC-772
U109 HIGH PRECISION 10V REFERENCE IC-1121
U110A IC, DUAL SER INPUT VLTG OUTPUT,
12BITMDAC IC-973
U111 IC, OP-AMP, AD705JR IC-814
U113 IC +5V RS-232 TRANSCEIVER, MAX202 IC-952
U114,U149 IC, VOLT COMPARATOR LM393D IC-775
U116 IC, OPTOCOUPLER, 2601 IC-239
Table 4-1 (continued)
Models 2303 and 2303-PJ digital board parts list
Circuit designation Description Keithley part no.
深圳德标仪器
135-1095-0799