Sony OA-D30V - Functional Characteristics; Generaioperation; Read;Write and Control Electronics; Drive Mechanism

SECTION 2
FUNCTIONAL CHARACTERISTICS
2-1. GENERAL OPERATION
The relationship and interface signals for the internal
functions of the OA-D30V are shown in Figure 2-1.
READ DATA
DRIVE SELECT
WRITE
DATA
WRITE GATE
POWER ON
RESET
WRITE
LOGIC
WRITE
HEAD
ERASE HEAD
DRIVE SELECT
WRITE PROTECT CONTROL
Ur-+-+--ERASE CONTROL
HEAD LOAD HEAD LOAD SOLENOID
STEP
CASSETTE IN LED
DIRECTION
CASSETTE IN DETECTOR
DRIVE SELECT (2 LINES)
IN USE LAMP
TRACK 00 WRITE PROTECT LED
INDEX CONTROL WRITE PROTECT DETECTOR
LOGIC
READY
PG DETECTOR
WRITE PROTECT
MOTOR
ON
TRACK 00 LED
TRACK 00 DETECTOR
STEPPING MOTOR
Figure 2-1. FUNCTIONAL DIAGRAM
2-2. READ/WRITE AND CONTROL
ELECTRONICS
OA-D30V
has following electronic components.
(1) Index Circuits
(2) Head Position Actuator Driver
(3) Head Load Actuator Driver
(4) Read/Write Amplifier and Transition Detector
(5) Write Protect
(6) Drive Ready Detector Circuit
(7) Drive Select Circuits
(8) In Use Lamp Circuits
-3-
2-3. DRIVE MECHANISM
The brushless direct drive motor rotates the sp indle
at 600 rpm. Owing to the long life brush less motor,
the
OA-D30V has no Motor On Control signal that
conventional 5.25" drives have. And for low power
consumption, the drive motor rotates
only while
Micro
Floppydisk is inserted. There is no index
hole in the Micro Floppydisk, because the OA-D30V
positions the Disk precisely and Index Pulse is gen-
erated by photo sensor and hall element combination.