30 Maintenance Manual
4.4.7 Turntable Circuits
4.4.7.1 Chamberboard schematic (061-x178-0x)
Page 1: The Turntable control signals originate on U1-A pins 23-26, 37 and 38.
They are then sent to the Turntable Board via J11. The shaft encoder sig-
nals arrive on J11 pins 12 and 14 and then connect to U1-A pins 29 and
30. The power and grounds needed by the Turntableboard are also send
over J11.
4.4.7.2 Turntable board schematic (061-0181-0x)
Page 1: The stepper motor drive signals arrive on J1 pins 1, 3, 5 and 7 and then
connect to the inputs of the H-Bridge driver U1 pins 1, 2, 11 and 12. U1
then outputs the motor signals on its output pins 5, 21, 8 and 16 which
are then connected to J2 pins 1-4. D1, D2, R4 and C5 and C6 work with
a square wave that U1 generates on pin 22 to generate the Bootstrap
voltage which is then sent in pin 15 of U1. Q1, Q2 and associated com-
ponents buffer and level shift the encoder enable signal coming from J1
pin 14 to drive the encoder supply out J2 pin 6. The two shaft encoder
signals arrive on J2 pins 7 and 8, and go to the chamberboard on J1 pins
11 and 13. R2 and R3 set the current limiting for U1 when driving the
stepper motor.
4.4.8 LED Circuits
4.4.8.1 Daughterboard schematic (061-0171-0x)
Page 1: Q1, R69, R70 and R128 is the Self-Test LED driver. The circuit will drive
the LED on unless U1-A drives its pin 14 high. That means that the LED
will be lit at power on when U1-A pin 14 is defined as an input.
4.4.8.2 Chamberboard schematic (061-x178-0x)
Page 1: Q1 is the driver for the Power/Status LED. If this is a Chamber Module,
then the LED is on the board and shown on this page. If this is an 8120
or an 8050, then the LED is on the Breakout Board. The White LED con-
trol signal is level shifted by Q4. U12 regulates the current to the white
LED. The white LED is only used on the 8120. Q3, R13, R14, R15 and
R16 is the Self-Test LED driver. The circuit will drive the LED on unless
U1-A drives its pin 14 high. That means that the LED will be lit at power
on when U1-A pin 14 is defined as an input.
Page 4: The white LED signal is sent to the Breakout Board via J10 pin 9. The
power status LED signal is sent to the Breakout Board via J10 pin 13.
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