Keithley 2425 Service Manual page 109

6-18 Replacement Parts
Table 6-2 (cont.)
Digital board parts list
U22,U1
U23,U25,U29
Circuit designation
U24
U26
U28
U3
U4
U5
U6
U7
U8
U9
VR1
VR2
Y1
* Order current firmware revision, for example, 2400-803C18
IC, DUAL D-TYPE F/F, 74HC74
IC, POS NAND GATES/INVERT,
74HCT14
Description
IC, TRIPLE 3 IN NAND, 74F10
IC, VOLTAGE REGULATOR,
LM340-12
IC, POWER VOLT REF, LT1004CZ
2.5
IC, MICROCONTROLLER
MC68332-FC
IC, +5V RS-232 TRANSCEIVER,
MAX202
IC, OP-AMP, AD705JR
IC, OCTAL INTER BUS
TRANS,75161
IC, PROTECTED QUAD POWER
DRIVERS
IC, POWER FACTOR CONTROL-
LER
IC, HEX INVERTERS, 74HCT04
DIODE, ZENER 30V BZX84C30
ZENER REGULATOR DIODE
CRYSTAL, FSM327
Model 2425 Service Manual
IC-773
IC-656
Keithley
part no.
IC-659
IC-60
IC-929
LSI-161
IC-952
IC-814
IC-647
IC-1212
IC-1113
IC-880
DZ-106-30
DZ-120
CR-41