
Lake Shore Model 642 Electromagnet Power Supply User’s Manual
7-10 Service
VR1
R74
C67
CR18
L1
AUXILIARY
C131
K3
CR10
R73
K2
VR3
K5
C132
J10
J9
MAGNET
F9
C130
R71
VR2
CR9
R78
J8
LOCATOR PINS
TP6
U13
C43
R52
R23
C29
R32
C21
R22
R29
R17
R28
R18
R24
R13
C30
IRDG
CR4
U15
R45
C45
C62
R55
TP8
CR5
CR6
U16
R46
R48
R42
C63
CR7
C111
C75
U48
C103
C107
J6
U34
C91
C93
C72
U47
U35
C102
C92
C105
U41
U33
C86
IEEE CONNECTOR
C122
C121
C120
C119
C118
C117
C108
C116
U49
R69
C24
R30
R34
C25
GND2
R20
R31
C26
C36
TP4
C57
I DAC OUT
U20
C38
C42
R50
C56
C49
R43
C50
TP10
R56
CR3
C40
C53
1
J3
C13
U25
U1
1
F2
C6
U52
C104
C70
U27
R64
A/D 2 IN
TP9
C61
U42
C94
R65
U45
R67
U36
R66
TP7
C87
A/D 1 IN C79
C83
U31
C80
C84
U32
C76
C97
C96
C106
C98
U37
U51
R70
TEST
C112
RUN
JMP1
C109
R54
R53
C23
U9
R41
U21
C54
U26
R8
R11
R10
J4
GND2
U2
KEYPAD PCB
R5 R7
U7
R6
C7
TP2
C10
C3
R14
R12
C44
VRDG
R33
R9
U10
R27
C18
R16
U14
R44
C32
U22
R68
SP1
C124
U46
C125
RS232C
Y2
C114
U50
C127
J5
MOUNTING SCREWS
R58
VREF
F4
HOUSEKEEPING TRANSFORMER SECONDARIES
MAIN TRANSFORMER
1
C8
FAN
R80
R4
R2
J2
C11
U3
C4
C5
U4
C52
ANALOG PCB
C27
U24
U17
C31
C39
TP5
R15
R26
R25
R21
U19
R19
R49
C55
C113
C81
C73
C123
R60
+5(1)
GND 1
642 DIGITAL PCB
c 2006 LSCI
111-278 /A
TP3
TP1
C51
Y1
R3
C2
C16
C17
C9
U5
U6
C37
R37
C22
R36
U12
R39
U18
R47
R40
R51
C60
ACAC ACAC
F3
CR1
ACAC
R1
R38
C19
C46
C1
R79
C47
C48
R35
C34
C28
C33
U23
C41
CR17
J1
F6
F5
ACAC
CR2
F1
F7
ACACACAC
R62
J7
R63
C58
CR15
Q1
R61
CR16
R59
F10
F8
U55
U39
C88
C85
U38
C100
C99
C77
U30
C89
C78
C90
U40
C95
K4
SUPPLY
POWER
U53
C126
C128
U54
C129
CR11
R77
Figure 7-6. Digital Board Parts Locations
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