Keithley 2015 Service Manual page 108

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