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Zenith Data Systems Manuals
Controller
SM-Z-89-37
Service manual
Zenith Data Systems SM-Z-89-37 Service Manual
Double-density disk controller
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Contents
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Table of Contents
Specifications
Reconfiguration
To Rearrange the Drive Numbers
Programming Modules
Circuit Description
Control Lines (P2)
Ul Data Buffer and U7B Buffer Direction Control
U2, U3, U4 Interrupt Control
U6 Control Decoder and Inverter
U7A Address Control Latch
U8A Reset Pulse Latch
U8B Head Load Delay
U9 and Ul0 Disk Controller Clock
Ull Interface Control Latch
U13 Input Signal Multiplexer
U14 Raw Read Latch
U15 Drive Buffer
U16, U17, U18, Ql, and Q2 Phase Lock Loop Tracking and Precompensation
U19, U20, U21, and U22 Disk Drive Interface
U23 Voltage Regulator
Diagnostic Routine
To Rearrange the Drive Numbers
Starting the Diagnostic Programs
Disk Controller Checkout
Disk Controller Checkout Error Messaees
General Drive/Controller Diagnostic
Initiating the General Drive/Controller Diagnostic
Available Tests and Options
D-General Drive Checkout
M-Media Check
S-Seek Time
A-Align
E-Exit
Service
Recalibration
VCO Bias Adjustment
VCO Center Frequency Adjustment (with Frequency Counter)
VCO Center Frequency Adjustment
(With Oscilloscope)
Precomposition Adjustment
In Case of Difficulty
Decimal to Octal to Hex to ASCII Conversion , , 5·6
Replacement Parts List
Semiconductor Identification Chart
Circuit Board X-Ray View
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SM-Z-89-37
Double-Density Disk Controller
Service Manual
2NI'N
data
~
systems
ZENITH DATA SYSTEMS
SAINT JOSEPH, MICHIGAN 49085
581;-8
Copyright
©
1982
Zenith Data Systems
1).11 Rights Reserved
Printed in the United States of America
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