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6236
Service manual
Data General 6236 Service Manual
Disk drive subsystem
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Section Title Page
Introduction
Description of Models
Performance Specifications
Field Replaceable Units
Disk Drive Subsystem Description
Printed Circuit Boards
Controller PCB
Head Disk Assembly
Coarse Air Filter
Switch Assembly (Model 6237 Only)
Latch Assembly {Model 6237 Only)
Power Package {Model 6237 Only)
Operating Controls and Procedures
Control Switches and Indicator Leds
External Switches
Circuit Breakers
Unit Switches Swl and SW2
Internal Switches
Indicator Leds
External Indicator Leds
Operating Procedures
Power-Up Procedure
Power Control PCB Leds
Power-Up Test Sequence
Spindle Control PCB Leds
Power-Down Procedure
Monitoring Procedure
Emergency Conditions
Operator Maintenance
Theory of Operation
Architectural Theory
Disk Function Pcbs
Head Disk Assembly {HDA)
Front Panel PCB
Power
Cabling
Functional Theory
Operational Theory
Power-Up Sequence {Including Power-Up Diagnostics)
The Control Block
Write Operation
Recalibrate Operation
Fault Diagnosis
Troubleshooting Reference Information
Power Amplifier PCB LED
Initial Troubleshooting Checkout
Initial Checkout
Power Control PCB Leds
Internal Switches
Fuses
Gaining Access to the Drive
Troubleshooting Flowcharts
Diagnostic Troubleshooting Programs
The 6236 Diagnostic Program - 6236 DIAG
6236 FMTR (Formatter) Program
6236 DIAG Program Run Times
Switch Options
Other Commands
Internal Cell Opening Commands
Other ODT Commands
6236 FUNC Program Run Times
Switch Options
Other Commands
UDKP RELI Program Run Times
UDKV RELI Program Run Times
Data Patterns
UDKP/UDKV REL! Command String
Other Commands
Operator Controlled Printouts
6236 FMTR Program Switch Options
Removal and Replacement Procedures
Tools and Equipment
Controller Pcb Removal/Replacement
Front Panel Removal/Replacement
Coarse Air Filter Removal/Replacement
Front Panel Pcb Removal/Replacement
Read/Write Pcb Removal/Replacement
Control Logic Pcb Removal/Replacement
Power Amplifier Pcb Removal/Replacement
Spindle Control Pcb Removal/Replacement
Power Control Pcb Removal/Replacement
Power Supply Assembly Removal/Replacement
Power Supply Stunt Plugs Removal/Replacement
POWER SUPPLY FUSE (Fl) REMOVAL/REPLACEMENT
Head Disk Assembly (Hda) Removal/Replacement
Terminator Removal/Replacement
Meter High Cabinet Removal/Replacement Procedures (Model 6237)
Latch Assembly (Top and Rear) Removal/Replacement
Switch Assembly Removal/Replacement
Power Package Fuse Removal/Replacement
Power Package AC Power Cord Removal/Replacement
Power Package Removal/Replacement
Installation/Removal
Electrical Specifications
Environmental Specifications
AC Power Cable Requirements
Tools, Equipment and Materials
Unpacking, Checklist and Inspection
Unpacking/Model 6236
Unpacking/Model 6237
Tools and Test Equipment
Unpacking the Controller PCB
6236/6237 Installation
Controller PCB Jumpering and Installation
Model 6236 Installation Procedure
Power-Up/Down Procedures
Power-Up Procedure
Subsystem Verification
Subsystem Removal
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Table of Contents
Troubleshooting
FAULT DIAGNOSIS
86
INITIAL TROUBLESHOOTING CHECKOUT
95
TROUBLESHOOTING FLOWCHARTS
99
DIAGNOSTIC TROUBLESHOOTING PROGRAMS
107
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