28 Maintenance Manual
fused by F2 and then used on the Daughterboard. U24 is the +12V regu-
lator. U25 is the +10V regulator. U23 is the +8V regulator. U20 is the
+3.3D regulator. L1, R123 and C82 filter the +3.3D so it can be used as
the +3.3A supply. U22 is the -10V regulator. U21 is the -8V regulator.
Page 3: The +15V, -15V, +10V, -10V, +5V and +3.3D supplies are sent to the
Connectorboard via J5 pins 20, 21, 27, 28, 29 and 30.
Page 6: The power supply voltages are shifted and divided as necessary so they
are nominally in the middle of the 0 to +2.5V range by the resistors
to the right of of U1-B. They are then fed to the microcontroller ADC2
through ADC9.
4.4.4.2 Connectorboard schematic (061-x172-0x)
Page 3: The +15V, -15V, +10V, -10V, +5V and +3.3D supplies arrive at the Con-
nectorboard on J5 pins 20, 21, 27, 28, 29 and 30. The +15V and -15V are
first fused by F1 and F2, renamed +15F and -15F, and then passed along
to Module 1 and 2 on J3 and J4 pins 13 and 7. The -15V is regulated
down to -5V by U17. The +3.3D is filtered by L13, R123 and C85 to be
+3.3A.
4.4.4.3 Chamberboard schematic (061-x178-0x)
Page 1: The +15V and -15V arrive on J2 pins 13 and 7. All supplies on the
Chamberboard are derived from +/-15V.
Page 5: U24 is the +5V regulator. R135 and C123 filter the +5V to be used as
+5L. U20 regulates the +5V down to +3.3D. L1, R123 and C82 filter the
+3.3D to be +3.3A. U25 is the +10V regulator, U23 is the +8V regula-
tor. U22 is the -10V regulator. U21 is the -8V regulator. The power sup-
ply voltages are shifted and divided as necessary so they are nominally
in the middle of the 0 to +2.5V range by the resistors to the right of of
U1-B. They are then fed to the microcontroller ADC3 through ADC7.
4.4.4.4 Probeboard schematic (061-0177-0x)
Page 1: The +15V and -15V arrive on J2 pins 13 and 7. All supplies on the
Probeboard are derived from +/-15V.
Page 5: U24 is the +5V regulator. R135 and C123 filter the +5V to be used as
+5L. U20 regulates the +5V down to +3.3D. L1, R123, and C82 filter
the +3.3D to be +3.3A. U25 is the +10V regulator, U23 is the +8V regu-
lator. U22 is the -10V regulator. U21 is the -8V regulator. The power sup-
ply voltages are shifted and divided as necessary so they are nominally
in the middle of the 0 to +2.5V range by the resistors to the right of of
U1-B. They are then fed to the microcontroller ADC2 through ADC6.
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