Quantum Q280

W5
A2
A1
RD
P1
RD
55
EP
J2
JUMPERS
J5
(TEST
CONNECTOR)
SMS 5080
(U19)
J3
(MOTOR
CONNECTOR)
TERMINA TORS ~~~_
J1
BUFFER
RAM
(U16, U17, U18)
MOTOR
EPROM
(U15)
LED
FYLO (U9)
W1D
Il-r------+--=--- DAC' s (U3, U28)
ACTUATOR
DRIVER (U4)
ADC (U 10)
DIFFERENTIAL
AMPLIFIER (U2)
J4
DATA SYNCRONIZER (U1)
8031
MICRO PROCESSOR
(U13)
Figure 2-9:
General PCB Layout; Plug, Terminator and Connector
Locations
wait Spin Option (WS)
When the WS shorting plug is installed, the motor waits for a START/
STOP UNIT command from the host via the SCSI bus before spinning.
Multiple drives can then be started in sequence to avoid overload-
ing the system power supply. Once the START/STOP UNIT command is
received, a drive is ready within 30 seconds.
with the WS shorting plug not installed, the motor automatically
starts spinning when power is applied, and the drive is ready in 30
seconds. Drives are shipped from the factory in this condition.
2-17