il II mlndator)' tilat approved £SO p"nudonl be OMen-ed during tills
proccdn". nil Indnllft and-stade wrilt-lt •• pI.
Note: Earlier revisions of this PCB. Seagale part number 20301, required
the PROM (7D) to be Iransferred
10 Ihe replacement PCB. This il no longer
'required and the replacement board il downward compatible for all
verlions.
Parts Required: PC Board 20301-004
Tools Required: Torque driver, T-IO and T-' TOI1l.,its
I. Secure a padded anti-static work surface.
2. Remove the two fronl panel screws (or if instaileJ, the printed circuit
cable shield.)
J. Orient the drive with the PCB up.
ot. Remove and retain the three PCB moundna screws. There may be
a clear insuladng washer installed at one or more of the mountin.
points. Be sure to replace at the same point(s) during reassembly.
,_ Locate and carefully free the Primed Circuit Cable. Do not crease
the cable.
6. Locale and carefully free the spindle motor and stepper motor
connections.
7. Lirt out the PCB.
8. Your replacement PCB will be shipped to you with a kit containing
two around springs.
a.
Jr the spindle molor has a steel ball in the center of its hub, mount
the spring with the graphite bUllon (I).
b.
Jr the spindle motor has a short post at the centerof the hub, mount
the bare copper sprina (2).
9. Verify thai the Ground Sprina assembly is aligned and will make
positive contact with the spindle hub. NOle thatlhe washer and hex
nUl bolh mounl on the solder side of Ihe PCB. Refer to Figur~ 17.
10. Tighten the Ground Spring mounting screw to 2.' inch/lbs. Transfer
the blue Isodamp pad to the replacement board.
II. Reconnect the Stepper and Spindle motor connections.
12. Reconnect Ihe Printed Circuit cable.
13. Torque the PCB mountina screws to 9 inch/lbs. Do not forget to
replace the clear insulating washer(s), ir Installed.
ISOOAUP - ••r •
The Seagate ST22S disc drive provides OEMs and system integratoi"$
with over 20 megabytes of formalled capacity in a $hock-~esisiani
half-heighi package. The ST225 is designed fOr single-user desk-lOp
systems, local storage in network or multi-user sysiems, Or
lIS an add-
in upgrade for PCs. The low-power ST22S design is ideal for th~ lip-
plical ions in either rugged indumial or quiet office environments. The
ST225 supports the industry-siandard ST412 interface and has the
same voltage requirements for ease of integration.
High reliability is assured through the use of LSI, a single printed cir-
cuit board, mini-monolithic heads and proven oxide media. Scagate's
proprietary helical-band rotary-actuator features simplicity and ease of
manufacture with excellent thermal stability. A dedicated head ship-
ping zone assures data integrity during shipping and hllndling. The
ST225 offers
II low-cost, rugged and reliable disc drive with an MTBF
of 20,000 hours.
Our manufacturing facilities have been designed and located ex-
clusively for high volume production and testing of disc drives.
Seagate's ongoing commitment to vertical integration assures availa-
biliiy of the latest technology at the same consistent quality and lowest
possible cost. Scagate inspects every assembly at every stage of the
production process. A proprietary test system continuously verifes oUr
goals of volume production with rigorous quality control.
Oct. 29, 1985
\A)lIage requirements. interface connectors and mounting requirements are iden-
tical to the 81225. Please refer to page 40, Appendix number 3 for specifications.
ST213
This manual may be used to install and configure 8eagate's ST213. The 81213 is a
half-heighl, single-disc. 10 Megabyie (formatted) Winchester. It employ s the samf[1
efficient helical-band rotary-actuator as the 81225 and also supports the industry-
standard 8T412 interface.
INTRODUCTION
.-t
~.
FIGURE 27:
Ground Spring
Assembly
fl,
GAOliNO
SPRING
~
PC8
SOlDER SIDE
,
=
ria
I
2·\6 UNe
GAOUNO/8UTTONHEAO SCREW
SPRING
(2)
I
WASHER
HEX NUT
PC8
COMPONENT SIDE
.u
ST11J OEM/II •••.f'
STZ1J OEM/II ••. F
vii
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