Tandon TM602S Service manual

TANDON OEM OPERATING AND SERVICE MANUAL
MODEL NUMBERS TM602S, TM603S,AND TM603SE
5.25" RIGID DISK DRIVES
SEPTEMBER
20, 1982
PRELIM'
RY
TANDON CORPORATION
20320 PRAIRIE STREET
CHATSWORTH, CA 91311
TEL. NO.: ( 213) 993-6644
TWX NO.: 910-494-1721
TELEX NO.: 194794
TANDON INTERNATIONAL GMBH
AM SUEDPARK 7A
D-6092 KELSTERBACB, WEST GERMANY
TEL. NO.: 06 11/49 6107 2091
TELEX NO.: 411547
pIN 187275-004 Rev .. C

CONTENTS
Page
Number
SECTION I--GENERAL INFORMATION
1.1 Scope 1-1
1.2 Introduction ....•.•...............•.•.• 1-1
1.3 Disk Drive Performance Characteristics. 1-1
1.4 Disk Drive Model Specifications .•••.••• 1-1
1.5 Pqysical Dimensions ••..•...•.••.•.•..•• 1-4
SECTION II--INSPECTION, INSTALLATION, AND INTERFACES
2.1 Introduction ••••••••••.••..•.••.•.•..•• 2-1
2.2 Unpacking and Inspection •••••••••••.•.• 2-1
2.3 Mounting Characteristics •••••••••••••.• 2-3
2.4 Power Cabling •••••••••••.••.••••••••••• 2-3
2.5 Standard Interface ••••••••••.•.•••••••• 2-3
SECTION III--THEORY OF OPERATION
3.1
3.2
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
3.2 .. 6
3.3
3.3.1
3.3.2
3.3.3
3.3.4
3.3.5
3.3.6
3.4
3.4.1
3.4.2
Introduction .•..•.•••.••.•••••.••••.••• 3-1
Input Control Lines ••.•••••..•••••••••• 3-2
Reduced Write Current .•••.•••..••••.••. 3-2
Write Gate ••••••.•••••••.•••••••••.•••• 3-2
Head Select ••••••••••.•••.••••••••••••• 3-3
Step Interface ••••••••••••••••••••••••• 3-3
Di rect i on In •••••••••••••••••.••••••••• 3-4
Drive Select ••••••••••••.•••.•••••••••• 3-4
Output Control Lines ••••.••••••••••••••• 3-5
Drive Selected ••••••••••••••••••••••••• 3-5
Seek Complete •••••••••••••••••••••••••• 3-5
Track 00eJ •••••••••••••••••••••••••••••• 3-5
Fault 0 •••••••••••• ,. •••• 3-6
Line Ready •••••••••••••••••••••••••.••• 3-6
Index 3-6
Data Transfer Lines ••••••••••••••.••••• 3-6
MFM Write Data •••••••••.••••••.••••.••• 3-6
MFM Read Data •••••••••••••••••••••••••• 3-7

Figure
Number
1
2
3
4
5
6
7
8
9
LIST OF ILLUSTRATIONS
FIGURES
Page
Title Number
Typical starting Current at Nominal
Voltage 1-3
Disk Drive Physical Dimensions 1-5
Locations of Interface Connectors 2-2
J 3 Connector ........•.............•...•• 2- 3
Jl Connector Dimensions 2-4
J2 Connector Dimensions ••............•.• 2-4
Control Signal Driver/Receiver
Circuit Combination .•........••...•.•..• 3-1
Step Mode Timing Diagram •..•••...•.••..• 3-4
Data Line Driver/Receiver Circuit ....••• 3-7
TABLES
Table
Number Title
Page
Number
1
2
3
4
Disk Drive Performance Characteristics •• 1-2
Disk Drive Model Specifications ....•...• 1-4
Standard Interface ...••........••...•..• 2-7
Head Select .•............•.••..• " ..... ". 3-3
APPENDIX
Appendix
Number Title
Page
Number
A
B
C~stomer Information Bulletins •.......•• A-I
Schematics ""." •.. " .. "...................... B-1
ii

1.1
SECTION I--GENERAL INFORMATION
SCOPE
This manual contains information useful in the installation
and operation of Tandon Corporation's TM600 family of 5.25"
rigid disk drives. This manual also contains interface
requirements and descriptions of signals. TM600 refers to
Model Numbers TM602S, TM603S, and TM603SE, as appropriate.
1.2
INTRODUCTION
The TM600 family of 5.25" rigid disk drives are
low-dost, random access memories that use moving head,
noncontact recording techniques. There are both two- and
three-platter models, which use standard Winchester
technology and 130 millimeter rigid media.
This drive consists of storage media that is contained
within the drive in a fixed (nonoperator removable)
configuration, read/write and control electronics, the drive
mechanism, a read/write head, a precision split band
positioning device, and an air filtration system.
Interface flexibility is provided by using an industry
standard interface on the drive. The "s" version is
compatible with larger capacity disk drives. Compatible is
defined as using the same pin assignment where the signal and
the function are common.
1.3
DISK DRIVE PERFORMANCE CHARACTERISTICS
The information contained in Table 1 pertains to all Imodels
of the Tandon TM600 family of disk drives.
1.4
Table 2
and the
DISK DRIVE MODEL SPECIFICATIONS
contains a list of the drive models
number of platters each one has.
1-1
available

Table 1
Disk Drive Performance Characteristics
Model TM602S TM603S TM603SE
Disks/Platters
Heads/Recording
Surfaces
2
4
3
6
3
6
TPI II Cit • II •• II •••• Cit Cit II It ••• 41) •• 254 TPI II ••• 0 .. II ., •• 0 • ,. ••••• II ••
Cylinders 153 153 230
RPfv1 •••••.•• Cit ••••••• II .... II ••• e. 0 • 0 ... ., • Cit ,,3600 RPM +1 percent ... 0 •••• Cit ••••
Recording Capacity,
Unformatted:
Per Drive 6.38 MBytes 9.57 MBytes 14.35 MBytes
Per Surface 1.59 MBytes 1.59 MBytes 2.39 MBytes
Per Track ..•..•..•..•...••.. 10 .40 KBytes ...•.....••....•.......••.
\I
Trans fer Rate ...•••.••..•.•••.•.••••... 5Mbi ts per second .•..•..•.•.••
Recording
Density (BPI)
Tracks
7690
612
7690
918
9625
1380
milliseconds .....•.••.•..•..••.•.•• •••••••••• 0 ••••• 3
153 ms, 99 ms 153 ms, 99 ms 210 ms, 137 rns
ramped seek ramped seek ramped seek
Head Settling Time ••.....•..•....... 15 milliseconds ..........••..•.•
Average Latency ..........•.•...••• 8.34 milliseconds ......••.........
7\ccess Time
Track-to-Track
Average
Mechanical Dimensions
Height .. 0 ••• 0 0 ., e .... •••• ., • Cit •• 0 0 ., •• 3. 25 inch I) ••• ., 0 I) It ...... II ...... 0 II .. 6) 0 •• 0
wid th 0 Cit ,. 0 " 8' • crt •••• "5 I) 75 inch CD •••• It 4) •• 0 Cit •(II •• <> 0 CD • ., • 0 0 0 •
Length. fit ••• Cit .. "0 •••• ,. • ., •••• (III co .. (I Cit .8 11) 00 inch., .. 0 0 •••••••• CD " • •• 0 0 •• Cit Cit •• It
Error Rates
Soft Read ...•••••.•.••..•.•.•••... lXl0
l0
bits ...•..••..••..••••••.••
Hard Read •.....•..••••••..•••.•••. lX10 ~ 2 bits ..
Seek Errors .••.....•...•...•...•.• 1X10 seeks ...•••.•..••.•.•.•.•••.
Power
+l:2V D. C. +/-
+5V D. C. +/-
10% 1.5 amps tyical, 5 amps maximum for 10 seconds
with no more than 5 millivolts PARD* (see Figure I).
5% .. 8 amps typical with no more than 50 millivolts
PARD*
Environmental
Ambient
Temperature:
Operating: 16°C to 46°C (50
0p
to l15
0
p)
Nonoperating: -35.4
0C
to 60°C (~400p to 140
0
P)
Relative Humidity: 8% to 80%
Maximum Wet Bulb Temperature:
*Periodic and Random Deviation.
Specifications SUbject To Change Without Notice.
1-2

>
N
+>
I()
+
o
N
...
...
....
0
...
0)
[)
co
W
~
z
9
,.....
z
a::
::>
....
co
a::
w
....
u..
«
It)
w
~
i=
'I:f
o
Figure 1
Typical Starting Currents At Nominal Voltage
1-3

Table 2
Disk Drive Model Specifications
Model
Number
TM602-S
Tt1603-SE
TM603-S
1.5
Number of
Platters
2
3
3
PHYSICAL DIMENSIONS
Kind of
Interface
Standard
Standard/Extended Version
Standard
The major physical dimensions of the TM600 family of drives
are contained in Figure 2. These dimensions are given
in English and in metric units.
1-4

0.06 ±0.01 in.
(1.6 ± 0.3 mm)
TAPPED MOUNTING HOLES FOUR
ON BonOM. TWO ON EACH SIDE
6·32 UNC X 31 in .. 17.9 mml DEEP 8
PLACES.
I
3.25 ±0.01 in.
(82.6 ± 0.3 mm)
SIDE VIEW
3.12 ± 0.02 in.
(79.2 ± 0.5 mm)
LJ
L87±OO2in
(47.5 ±0.5 mml
8.00 in. maximum -------- ....... 1I
...--.-------- (203.2 mm)
I
0.19 ±0.01 in.
(4.8 ± 0.3 mm)
3.38 ±0.01 in.
85.9 ± 0.3 mm)
5.88 ±0.01 in.
(149.4 ± 0.3 mm) BOTTOM VIEW
5.75 ± .02 in.
(146.1 ± 0.3 mm)
5.50 ± .02 in.
139.7±0.5 mm)
0.06 ±0.01 in.
(1.6 ± 0.3 mm)
Figure 2
Disk Drive Physical Dimensions
1-5

2.1
SECTION II--INSPECTION, INSTALLATION, AND INTERFACES
INTRODUCTION,
This section contains information pertinent to the inspec-
tion, installation, and interfaces of the Tandon TM600 family
of rigid disk drives.
The electrical interface between the drive and the host
system is via four connectors. Jl provides control signals
for the drive. J2 provides for the radial connection of
read/write data signals. J3 provides for D. C. power. J4
provides for frame ground. Figure 3 contains the locations
of the interface connectors.
2.2 UNPACKING AND INSPECTION
The drive is shipped in a protective container which,
when bulk packaged, minimizes the possibility of damage
during shipment. The following procedure is the recommended
method of uncrating the drive.
1. Place the shipping container on a flat work surface.
2. Remove the upper half of the inner container.
3. Remove the drive from the lower half of the
inner container.
4. Check the model number and top assembly description
against the packing slip.
5. Visually examine the contents of the shipping
container for possible damage.
6. Notify the
is found.
carrier
immediately if any damage
7. The inside chamber of the drive is a sealed
compartment that must not be opened.
NOTE
REMOVAL OF THE COVER
INVALIDATES THE WARRANTY.
2-1
OF THE
DRIVE

FRONT PANEL~
OR CABLE
HOL~SS~4 PLACES)
HARNESS
V-AXIS
COMPONENT SIDE
OF CIRCUIT BOARD
X-AXIS
Figure 3
Connectors
of Interface
Locations
2-2

Before applying power to the disk drive,
inspection procedure should be performed:
the following
1. Check to ensure that the circuit boards are secure.
2. Check to ensure that the connectors are firmly
seated.
3. Notify the carrier immediately if you find any
damage.
2.3
MOUNTING CHARACTERISTICS
The mounting characteristics of the TM600 family of disk
drives are contained in Figure 2. There are four 6-32,
tapped mounting holes on the bottom of the disk drive, and
two on each side of it.
2.4
POWER CABLING
The D.C. power connector, J3, is a four-pin AMP Mate-N-Lok
device, pIN 350211-1, which is mounted on the solder side
of the circuit board. The recommended mating connector, P3,
is AMP piN 1-480424-0, using AMP pins pIN 60617-4. J3 pins
are labeled on the J3 connector. Figure 4 contains an
illustration of the J3 connector.
Figure 4
J3 Connector
The frame ground connector, J4 is the Faston AMP pIN 61761-2.
The recommended mating connector is AMP pIN 62187-1.
2.5 STANDARD INTERFACE
The standard or usu model interface is contained in Table
2-1. Connection to Jl is via a 34-pin circuit board edge
connector. ~The dimensions of the Jl connector are found in
Figure 5. The pins are numbered 1 through 34. The even
numbered pins are located on the compoenent side of the
circuit board. Pin 2 located on the end of the circuit board
connentor closest to the D. C. power connector J3/p3, and it
is labeled. A key slot is located between Pins 4 and 6.
2-3

0.063 in.
(1.6 mm)
l[
lr
0.036 ± 0.004 In.
(0.91 ± 0.' mml
2 4
--11- 0050 in.
(1.27 mm)
--..!.l WO.050 in. (1.27 mm)
~ J4I 0.100 in. (2.54 mm)
~-------_ 1.775 ± 0.010 in. -... .. 1
(45.1 ± 0.25 mm)
,r
.....
,...
.....
r---J
)
.....
--
oin.
0.450 in. (11.4 mm)
----i'"'
--
mm)
I,
~ I,
I
J
t
0.400 ±0.01
(10.2 ± 0.25
BOARD THICKNESS
0.062 ± 0.007 in.
(1.59 mm ± 0.18 mm)
Figure 5
Jl Connector Dimensions
,...- 0.063 in.
, _ (1.6 mm)
BOARD THICKNESS
0.062 ± 0.007 in.
(1.59 mm ± 0.18 mm)
0.050 in. (1.27 mm)
0.100 in. (2.54 mm)
0.050 in. II I -lll~~ ,_
(1.27 mm) --;-'iLr- ---l I. I
. 1.075±0.010in.~
(27.3 ± 0.25 mm)
0.036 ±O.• 004 in'1r--
(0.91 ±0.1 mm) I
---~5 2 --.......-
1
0.400 ± 0.010 in.
10.2 ± 0.25 mm)
_t
Figure 6
J2 Connector Dimensions
2-4

The recommended mating connector for PI is a 3M ribbon
connector, pIN 3463-0001, without ears.
connection to J2 is via a 20-pin circuit board edge con-
nector. The dimensions of the J2 connector are found in
Figure 6. The pins are numbered 1 through 20. The even
numbered pins are located on the component side of the
circuit board. The recommended mating connector for P2 is a
3M ribbon connector, pIN 3461-0001, without ears. A key slot
is located between Pins 4 and 6.
2-5

Table 3
Standard Interface
Connector
Interface
Pin Number
Signal (Gnd)
Signal
Type I/O
Signal Name
PI
A
34-Pin
Ribbon
Daisy
Chain
P;
I
20-Pin
Ribbon
Daisy
Chain
or
R?dial
~
P2
P~
4-pin Power
Radial
p~
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
1
3
5
7
9
11
13
14
15
17
18
19
1
2
3
4
( 1)
( 3)
( 5 )
(
7)
(9 )
(11)
(13)
(15)
(17)
(19 )
(21)
( 23)
(25)
(27)
(29)
(31 )
(33)
( 2)
(4 )
(6)
(8)
(10 )
(12)
(16)
(20 )
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
D
D
D
D
I
I
o
o
o
I
I
o
o
I
I
I
I
I
I
o
I
I
I
o
o
Reduce Write ~
Head Select 2
Write Gate
Seek Complete
Track 000
Fault
Head Select 20
Reserved (To i2-7)
Head Select 2
Index
Ready
Step
Drive Select 0
Drive Select 1
Drive Select 2
Drive Select 3
Direction In
Drive Selected
Reserved (+5 V)
Reset
Reserved (TO Jl-16)
Spare
Ground
+ Write Data
- Write Data
Ground
+ Read Data
- Read Data
Ground
+12 VD. C. In
12 V Return
5 V Return
+5 VD. C. In
Notes:
1. S - Single ended
2. D - Differential
2-6
3. I - Drive input
4. 0 - Drive output

3.1
SECTION III--THEORY OF OPERATION
INTRODUCTION
There are three kinds of interface signals:
1. Input Control Lines
2. Output Control Lines
3. Data Transfer Lines
Signals on the Input Control lines are standard TTL levels.
They have the following electrical specifications:
True: 0.0 volt D. C. to 0.4 volt D. C. @I= 40 rnA
maximum
False: 2.5 volt D. C. to 5.25 volt D. C. @I=0 rnA
open
See Figure 7 for the recommended circuit.
+ 5V
7438 OR
EaUiVAlENT
20 FT. MAXIMUM-'
Figure 7
220Q
74LS14 OR
EaUIVALENT
Control Signal Driver/Receiver Circuit Combination
3-1

3.2 INPUT CONTROL LINES
There are two kinds of Input Control lines, those that are
multiplexed in a multiple drive system and those that do the
multiplexing.
The Input Control lines that are mUltiplexed include:
1. Reduced Write Current
2. Write Gate
3. Head Select
4. Step Interface
5. Direction In
The Input Control lines that do the multiplexing are:
1. Drive Select 0
2. Drive Select 1
3. Drive Select 2
4. Drive Select 3
3.2.1
Reduced write Current
When this Input Control line is activated low'(true) in
conjunction with the write gate, a lower value of write
current is selected for writing on the disk. When the signal
is set high (false), the higher value write current is
selected. When writing on Tracks 0 through 127, it is
recommended that this line be set false. For Tracks 128 and
greater, the Reduced Write Current line should be set true.
A 220/230 ohm resistor pack allows the line to be terminated.
3.2.2
Write Gate
The Write Gate signal enables data to be written on the disk
when it is activated or when the logical zero (true) level is
reached. The ready line must be valid before write gate is
activated. If a disk drive fault occurs, further writing on
the disk is propibited. In addition, the Seek Complete line
should go true before you begin to write any information on
the disk.
The
line
inactive or logical high (false) level on the Write Gate
enables the step pulses to step the head, arm actuator.
3-2

3.2 .. 3 Head Select
There are three Head Select lines. They are used to select
each read/write head--0, 1, or 2--in a binary coded sequence.
Head Select signals are logic low (true) levels. They must
be activated in conjunction with the Drive Select lines. The
heads are numbered 0 through 5. Head Select 0 is the least
significant line. Table 3-1 contains information about the
Head Select line sequence, disk drive model number, and
numbers that may be selected.
Table
3-1
Head Select
Head Select Line
Sequence Model Number
22
2120TM602 TM603
Head Number Selected
11 1 00
11011
10 1 2 2
1
(2}
033
01 1 4
(2}
1
(2}
5
Legend:
1= Logical
High
(False)
(2}
=
Logical
Low (True)
A 220/330 ohm resistor pack allows the line to be terminated.
3.2.4
Step Interface
When the Step Interface line is activated in conjunction with
the Direction In line, the read/write heads move in the
direction defined by' the Direction In line. The motion is
initiated by a logical zero to a logical one transition or by
the trailing edge of the step pulse. Any change in the
Direction In line must be made one hundred nanoseconds before
the leading edge of the step pulse. The quiescent state of
this line should. be held logically high (false).
The heads move at the rate of the incoming step pulses.
Figure 8 contains the sequence and the requirements for step
timing.
3-3

, 00 NS MINIMUM. 200 US MAXIMUM
500 NS MAXIMUM
-STEP
--I !~
f/?2Z7],---~1
If
I ~ 3.0 MS MINIMUM --IIj
~1 loOllllllll--'·O US MINIMUM
!.- STEP LOGIC Ur----I) f
ENERGIZED I
I
4111(15 +3 MS~
4- ITYPICAL
...----------------1,
-SEEK COMPLETE ---------', '----
DIRECTION IN
Figure 8
step Mode Timing Diagram
3.2.5 Direction In
The Direction In line determines the motion of the read/write
heads when a step pulse is issued. The motion is toward the
center of the disk if the Direction In line is in the true
(low) state when a step pulse occurs. The direction of the
motion is away from the center of the disk if the Direction
In line is in the false (high) state when a step pulse
occurs.
A 220/330 ohm resistor pack allows the line to be terminated.
3.2,,6
Drive Select
Drive Select lines 0 through 3 provide a means of selecting
and deselecting a drive. These four lines select one of
four drives that are daisy chained to the controller.
The drive address is determined by a select shunt on the
Signal circuit board. Drive Select lines 0 through 3 provide
a means of daisy changing amaximum of four drives to a
controller.
When logically high (false), the output drivers are open
circuits or logically high (false), and the drive receivers
do not acknowledge signals presented to them. A Drive Select
line must remain stable in the true (low) state until a Step
or Read/Write command is executed.
Only one line can be true (low) at a time. An undefined
operation might result if two or more units are assigned the
same address or if two or more Drive Select lines are in the
true (low) state simultaneously.
3-4

3.3 OUTPUT CONTROL LINES
The Output Control lines are enabled by their respective
Drive Select line. They send status information to the
controller, such as: drive selected, seek complete, Track000
fault, and line ready. In addition, the Index line is pro-
vided as an output to the controller for timing information.
The Output Control lines use an open collector gate that is
capable of sinking a maximum of forty milliamperes in a
logical low (true) level, with amaximum voltage of 0.4 volt
measured at the driver. When the gate is off or logically
high (false), the collector cutoff is amaximum of 250 u
am~s. See Figure 8 for the recommended circuit.
3.3.1 Drive Selected
When the Drive Selected lines coincide with the selected
jumper on the shunt pack, the Select Status line goes
logically low (true). This line informs the host system of
the selection status of the drive.
NOTE
ONLY ONE DRIVE MAY BE SELECTED AT A TIME.
3.3.2 Seek Complete
~he Seek Complete line indicates that the read/write heads
have settled on the selected track at the end of a seek
sequence. This status line is set logically zero (true) at
the end of a normal seek. It is set logically high (false)
in two cases:
1. A recalibration sequence is initiated by
drive logic at power on because the heads are
not over Track 000.
2. Five hundred nanoseconds, typical, after the
leading edge of a step pulse or of a series of step
pulses.
3.3.3 Track 000
The Track
read/write
line goes
tioned on
moved away
000 line indicates to the host system that the
heads are positioned on Track 000. The Track 000
logically low (true) only When the heads are posi-
Track 000. It remains low until the heads are
from Track 000, the outermost data track.
3-5

3.3.4 Fault
The Fault line indicates to the host system that a condition
exists on the disk drive that is going to cause improper
writing on the disk. When this line is logically low (true),
Write Data is inhibited and further writing on the disk is
pro-hibited until the condition is corrected. The condition
under which the Fault line goes true is that D.C. voltages
are grossly out of tolerance.
3.3.5
Line Ready
In conjunction with the Seek Complete line, the Line Ready
line indicates to the host system that the disk drive can
read, write or seek, and that all I/O signals are valid. The
Line Ready line goes logically low (true) approximately 15
seconds after power on. The Line Ready line goes logically
high (false) if the drive is not selected or if the speed of
the motor is too slow. When this line is false, all writing
and seeking is inhibited.
3.3 .. 6 Index
An index pulse is provided once every revolution (16.67 ms
nominal) to indicate the beginning of a track to the con-
troller. The transition from logically high (false) to
logically low (true) is the only valid transition. The
leading edge of the pulse must be used to ensure accurate
timing.
3.4
DATA TRANSFER LINES
The Data Transfer lines transfer information between the host
system and the disk drive when the drive is selected. These
lines are differential in nature. They may be multiplexed
when us ing Drive Se lect .0
The MFM Write Data pair of lines and the MPM Read Data pair
of lines are provided for the transfer of data. Figure 9
contains q typical driver/receiver circuit combination used
for data transfer signals.
3.4.1
The MFM
provide
on the
MFM Write Data
Write Data lines are the differential pair that
the data to be stored on the track. A flux reversal
track to be written is caused When the plus (+) MFM
3-6