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ST212
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Seagate ST212 Product Manual
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Contents
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Table of Contents
Table of Contents
1 Specification Summary
Performance Specifications
Access Time Definition and Timing
Functional Specifications
Physical Specifications
Reliability Specifications
Bit Jitter
Media Defects
Environmental Specifications
Ambient Temperature
Temperature Gradient
Relative Humidity
Altitude Limits
Operating Shock
Nonoperating Shock
Differentiai Read Filter: Test Points 1 and
DC Power Requirements
Input Noise Ripple
Input Noise Frequency
FIGURE 1: Typical +12 Volt DC Start-Up Current Profile
Mounting Requirements
Handling and Static-Discharge Precautions
2 St212 Host/Drive Interface
Control/Status Signais: PCB Edge-Connector JI
FIGURE 3: JI Connector Dimensions
FIGURE 4: Control/Status Signais
Data Signals:pcb Edge-Connector J2
FIGURE 6: Data Signais
Frame Grounding: Lug JI0
FIGURE 7: Host/Drive Interface and Drive Configuration
3 Drive Configuration
Drive Configuration: Shunt J9 (MLC-Ol)
Daisy-Chain
Radial
Write Fault
Life Test
FIGURE 9: Radial Configuration
4 Control Input Signais
Head Select 2
Write Gate
FIGURE 10: Control Signais Driver/Receiver Combination
Step
Buffered Seek
FIGURE Il Read/Write Timing
Slow-Step (Single-Track)
FIGURE 12 General Step Timing
FIGURE 13: Slow-Step Timing
Auto-Truncation
Direction in
Drive Select
FIGURE 14: Auto-Truncation Timing
FIGURE 15: Drive Select
Control Output Signals
Drive Selected
Index
Track
Ready
Seek Complete
Write Fault
Write Fault Signal Generation
FIGURE 16: Typical Power-Up Sequence
Write Current Interruption
Fault Detection PC Board 20292-XXX
Voltage and Head Select Comparator
Write Fault Reset
Fault Detection: PC Board 20243-XXX
Voltage Comparator
Head Select Comparators
6 Read/Write Operations
Write Operation: PC Board 20292-XXX
MFM Write Data
FIGURE 19: Data Signal Driver/Receiver Combination
Write Gate
Write Dataprocessing
Precompensation
Write Operation PC Board 20243-XXX
Write Gate
Line Receiver
Formatting
FIGURE 22: 17-Sector, 512-Byte/Sector Format Example
Read Operation PC Board 20292-XXX
MFM Read Data
Head Select
LSI Preamp
Low Pass Filter
Read Data Conversion
Read Operation: PC Board 20243-XXX
Head Select
LSI Preamp
Low Pass Filter
Phase Shifter
Zero Cross Detector
Time Domain Filter
Line Driver
7 Microprocessor
MPU: PC Board 20292-XXX
FIGURE 25: MPU: PC Board 20292-XXX
MPU: PC Board 20243-XXX
FIGURE 26: MPU: PC Board 20243-XXX
8 Mofor SPEED CONTROL
Motor Speed Control: PC Board 20292-XXX
Hall Effect Transducer
Spindle Motor Control LSI
Motor Speed Control PC Board 20249-XXX
Hall Effect Transducer
Speed Reference Circuit
Pulse Shaper
Integrator
Current Limit
Microprocessor: Motor on
Motor Drivers
Dynamic Brake
9 Field Service
Test Point Data: PC Board 20292-XXX
Differentiai Read Filter: Test Points 1 and
Track 0 Sensor: IC 3B, Pin
Index Sensor: Test Point 9
FIGURE 31: Index Sensor
Test Point Data: PC Board 20243-XXX
Read Data: Test Points 3 and 4
Track 0: Test Point 5
Index Sensor: Test Point 6
Field Accessible Components
FIGURE 33: Read Data
FIGURE 34: ST212 PC Board Removal
Main Control PC Board
Motor Control PC Board Removal (MLC-OO Only)
FIGURE 35: Index Sensor Adjustment/Removal
Index Sensor Removal
Installing the Optional Full-Height Front Panel
FIGURE 36: Track " Sensor Removal
Track 0 Sensor Removal
Pcb 20243-XXX
Pcb 20292-XXX
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