6-8 Replaceable Parts
Circuit designation Description
Keithley
part no.
U141 IC, PRECISION REFERENCE, LM399 196-600A
U142 IC, OP-AMP, NE5534D IC-802
U144 IC, LOW DROPOUT REGULATOR, LM295T IC-962
U146 IC, POS NAND GATES/INVERT, 74HCT14 IC-656
U147,164 IC, DUAL D-TYPE F/F, 74HC74 IC-773
U148,153 IC, QUAD 2 IN NOR, 74HCT02 IC-809
U149 IC, NCHAN LAT DMOS QUADFET,
SD5400CY
IC-893
U150 IC, OPTOCOUPLER,2611 IC-690
U151,152 IC, 32KX8 STAT CMOS RAM, D43256C LSI-93-100
U154 IC, QUAD D FLIP FLOP W/CLK, RESET
74HC175
IC-923
U155 IC, OPTOCOUPLER, 2601 IC-239
U156 PROGRAMMED ROM 2015-804*
U157 PROGRAMMED 2015-803*
U158 IC, GPIB ADAPTER, 9914A LSI-123
U159 IC, +5V RS-232 TRANSCEIVER, MAX202 IC-952
U160 IC, OCTAL INTERFACE BUS, 75160 IC-646
U161 IC, OCTAL INTER BUS TRANS, 75161 IC-647
U163 IC, 8-CHAN ANA MULTIPLEXER, DG408DY IC-844
U165 PROGRAMMED ROM 2000-802A02
VR101,114 VAR, 576V METAL OXIDE VR-5
VR102,117,118 DIODE, ZENER 6.0V, BZX84B6V2 DZ-87
VR103,104 DIODE, ZENER, 6.8V, MMSZ5235BT1 DZ-100
VR105,106,115,116 DIODE, ZENER 11V, MMSZ11T1 DZ-103
VR107,VR108 DIODE, ZENER 3.3V, MMBZ5226BL DZ-94
VR109 DIODE, ZENER 17V, MMBZ5247BL DZ-104
VR110 DIODE, ZENER 5.1V, BZX84C5V1 DZ-88
VR112,VR113 DIODE, ZENER, 6.2V, MMSZ6V2 DZ-97
Y101 CRYSTAL CR-55-1
Y102 OSCILLATOR HIGH SPEED CMOS 12MHZ CR-37
* Order current firmware revision (for example, A01).
Table 6-1
DMM (mother) board parts list (continued)
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