Heathkit H-17-1 Assembly instructions

Heathkit" Manual
for the
48 TPI, 5-1/4"
FLOPPY DISK DRIVE
Model H-17-1
595-2716
Copyright © 1981
Heath Company
HEATH COMPANY All Rights Reserved
Printed in the United States of America
BENTON HARBOR, MICHIGAN 49022

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Heathkif
TABLE OF CONTENTS
Introduction , 3
Programming ............................... .. 4
Cable
Connections 7
Rotational Speed Test 8
Operation ..... ............................ .. 10

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Heathkit
INTRODUCTION
The H-17 -1 Floppy Disk Driveis a mass storage device
that stores programs and information for your compu-
ter.
Information is stored on one side of a 5.25-inch,
oxide-coated diskette in 40 tracks. This drive is capa-
ble of
double-density operation when it is used with a
double-density controller.
The recording head is a single Read/Write gap-type
head.
The head carriage is positioned by a stepper
motor. The disk controller circuit board, in your com-
puter, is
the interface between the computer bus and
the Disk Drive.
A
transducer in the Drive detects the presence or
absence of a
notch in the diskette to insure write
protection. If the notch is not detected, a signal is
transmitted to the controller to indicate a read-only
operation. If the notch is detected, the signal indicates
a read/write operation.
The diskettes load quickly and easily through the
door in the front panel.

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PROGRAMMING
If you intend to use this Drive with the H-88-1 hard-
sectored controller (or with an H-17 controller in an
H-8),
perform the steps under "Hard-Sectored Con-
troller."
If you intend to use this Drive with a double-density
controller, perform the steps under "Soft-Sectored
Controller."
HARD-SECTORED CONTROLLER
Refer to Pictorial 1 for the following steps.
If this Drive is to be hardware unit 0, cut the
programming plug as shown in Part A of
the Pictorial.
If this Drive is to be hard ware unit 1, cut the
programming plug as shown in PartBof the
Pictorial.
If this Driveis to be hard ware unit 2, cut the
programming plug as shown in Part C ofthe
Pictorial.

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Heathkit
8
PART A
C:::J
,
PART B
I I~ I
.,..,.., ...... .,.., .J
CUT ~Ir-P-R -0 G-R-A M-M-'-N G'
I~,~,~J ~I,n""l PLUG
PART C
,
PICTORIAL 1

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I
PART A
I I
,
PART B
PART C
PICTORIAL 2

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Heathkif _
SOFT-SECTORED CONTROLLER
If this Drive is to be hardware unit 1, cut the
(Double-Density)
programming plug as shown in PartB ofthe
Pictorial.
Refer to Pictorial 2 for
the following steps.
If this Drive is to be hardware unit 2, cut the
If this Drive is to be hard ware unit 0, cut the
programming plug as shown in Part Cof the
programming plug as shown in Part A of Pictorial.
the Pictorial.
CABLE CONNECTIONS
Refer to Pictorial 3 for a view of cable connections.
,
PICTORIAL 3

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ROTATIONAL SPEED TEST
If you intend to use this drive with the hard-sectored,
single-density controller (H-BB-l or H-17), perform
the following "Speed Test."
If you intend to use this drive with a soft-sectored,
double-density controller, perform the rotational
speed tests as described in your system software
documentation.
SPEED TEST
This test will check the rotational speed of the floppy
disk drive. After the test starts, it will display the disk
drive speed test message and a "speed equals" mes-
sage as follows:
Disk
drive rotational speed test
Drive speed =
The word' 'Working" will be flashed on and off at the
home position and a drive speed number (in octal),
which should be as close to 200 as possible, will
update with each flash on the screen. The rotational
speed tolerance is one percent. The displayed value
should be between 166 and 212 (remember, octal
numbers jump from 177 to 200). Do not adjust the
speed unless it is out of tolerance.
Your
drive unit has a control labeledR30 or R7, which
is used to vary the drive speed. This control is located
near the lower edge of the circuit board as shown in
Pictorial 4, or on
the other side of the drive if your
drive is like the one shown in Detail4A. This adjust-
ment may be extremely sensitive, so if an adjustment
is necessary, do not turn it far in either direction. Less
than one degree of rotation in either direction should
bring the drive speed into tolerance. Turn the control
clockwise to decrease the speed or counterclockwise
to increase it.
You
may have to perform this test again at some future
time, depending upon how heavily your floppy is
used. As
the drive bearings wear, the speed may
change slightly. Fluctuations within the tolerance are
normal and may be attributed to variations in temper-
ature and humidity.
( ) Plug in the line cord and turn on the Computer.
Detail4A

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( ) Refer to Pictorial 4, install a diskette into the
( )
drive as shown, and close the door. The test will
not start until this is done. Also, the testwill not
damage the data on the diskette.
( ) Be
sure the OFF LINE Key is up (out). Then
( )
obtain
the "H:" prompt. (Simultaneously push
the right-hand SHIFT and RESET keys if neces-
sary.)
( )
Type G7372§. The total entry will be:
H: Go 7372 §
and the test will start.
If you are using an H-8 with an H-17, refer to
"Rotational
Speed Adjustment" in the H-17
Operation Manual.
PICTORIAL 4
If the drive speed is less than 166 or greater than
212, carefully adjust R30 or R7 with a small
screwdriver until the speed is within tolerance
and as close to 200 as possible.
Simultaneously push the right-hand SHIFT and
RESET keys to stop the test.
Remove
the diskette from the drive unit.
Turn off the Computer and unplug the line
cord.

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OPERATION
DISKETTE LOADING
Refer to Pictorial 5, open the front panel door, and
insert the diskette, label towards the screen. Then
close the door.
DISKETTE HANDLING
The diskette can be easily damaged. Handle it care-
fully as follows:
1. Keep the diskette in its storage envelope
whenever it is not in the Floppy Disk drive.
2. Keep the diskette away from magnetic fields.
Magnetic fields can distort the recroded data on
the diskette.
OR
LABEl
SIDE
10 IS KETTE I
3. Replace damaged or worn storage envelopes.
4. Write on the plastic jacket only with a felt-tip
pen. Do
not use a lead pencil or ball-point pen.
5. Keep the diskette away from hot or contaminat-
ing materials.
6. Do not expose the diskette to sunlight.
7. Do not touch or clean the surface of the diskette.
Abrasions
can alter stored data.
IOISKETTEI
PICTORIAL 5

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WRITE-PROTECT
This diskette can be write protected so that it cannot
be written on. To do this, cover the side notch with a
tab or
opaque tape. See Pictorial 6.
o
0Q)
TAB 0 R
NOTCH
OPAQUE\
TAPE
UNPROTECTED
PICTORIAL 6
WRITE PROTECTED