Special Test Equipment; Special Tools - HP 7925D Service Manual

Maintenance
7925
Table 2-1. Standard Tools
TOOL
Lubricant*
Pozidriv Bit
Alcohol, isopropyl (filtered)*
Bit, 1/4-inch drive, hex key
Bit, 1/4-inch drive, Pozidriv #2
Bit, 1/4-inch drive, slotted
Bit, 1/4-inch drive (used with
part no. 1535-2653)
Extension bar (used with part
no. 8710-1007)
Gauge set, 0.0015 - 0.025 inch
Hex head drive (used with
part no. 8710-1007)
Inspection mirror
Kimwipe tissues*
Pin extractor
Pliers, diagonal cutting
Pliers, long nose
Q-tips
Screwdriver,4 x 114-inch
Screwdriver,3 x 3/16-inch
Screwdriver, Pozidriv
Screwdriver, Pozidriv
Screwdriver, Pozidriv, stubby
Screwdriver, offset
Socket set, 1/4-inch drive
Soldering iron
Soldering iron tip
Steel rule, 6-inch
Tape, masking
Wire strippers
Wrench, 7/16-inch box
Wrench, torque, 0 - 12 inch-pounds
Wrench, torque, 30 - 200 inch-pounds
Cleaning sleeves (w/handle)
*Do not substitute.
HP
PART NO.
6040-0084
8710-0915
8500-0559
8710-0664
8710-0903
8710-0669
1535-2652
8710-1132
8750-0053
8710-1145
8830-0005
9300-0001
8710-0688
8710-0006
8710-0016
8520-0023
8730-0001
8730-0019
8710-0900
8710-0899
8690-0011
8690-0021
8750-0001
0460-0030
8710-0058
8720-0017
1535-2653
8710-1007
9310-5074
The DSU test module simulates controller signals which
are applied to the disc drive and processes disc drive re-
sponses for display. Simulated signals are produced either
manually or automatically to operate the disc drive under
both static and dynamic conditions. All operations, includ-
ing read and write, are limited to addressing and acces-
sing. The actual writing of data is not performed and
during a read operation, the DSU test module does not
decode any data. Disc drive faults that occur during any
operation are displayed by the light-emitting diodes which
are located on the operator panel.
In the automatic mode (functions 1,2, and 3), the DSU test
module provides the means to automatically perform al-
ternate, incremental, or random seek operations. These
capabilities are used to exercise the disc drive to relax any
mechanical stresses, and to permit an adjustment of the
seek time.
The index sequences (functions 4, 5, and 6) are used for the
circumferential alignment of the heads.
In the alignment mode (function 7), the DSU test module
provides the means to automatically seek a specific
cylinder while displaying a dimensional offset. These
capabilities are used to align the data heads.
In the manual mode (function 8), the DSU test module
provides the means to manually program cylinder addres-
ses, head and sector addresses, unit addresses, and offset
information onto the control bus lines and the disc drive
functions onto the tag bus lines. These capabilities are
typically used for off-line checkout of the disc drive.
A three-digit numerical display is provided on the DSU
test module for measuring seek time, delay between seeks,
Table 2-2. Special Tools
WARNING
Isopropyl alcohol is a restricted article
(flammable Iiquid). Transport in accordance
with Department of Transportation Regula-
tions, Title 49, parts 171 - 177 (Hazardous
Materials).
2-7. SPECIAL TEST EQUIPMENT
The only special test equipment required for maintenance
is the Disc Service Unit. The Disc Service Unit (DSU) com-
ponents include the following items and are depicted in
figure 2-1.
a. DSU Test Module, part no. 13354-60005
b. Head Alignment PCA, part no. 13354-60110
c. 20-Pin Jumper Cable, part no. 13354-60013
d. 50-Pin Jumper Cable, part no. 13354-60012
2-2
HP PART NO.
NAME
OR
HP PRODUCT NO.
Air Pressure Measuring Gauge 0101-0374
Cam Alignment Assembly 13354-60001
CE Pack Assembly 13357A
Extender Board 13354-60003
Head Alignment Tool 13354-20007
Head Installation Tool 13354-20009
Head Initial Position Tool 13354-20008
Spindle Logic Extender 13354-60002
Head Extender Cable 13354-60025
Head Loading Tool 13354-60023
Fault Indicator Assembly 13354-60014
Pack Lock Lubrication Tool
07920-20086
Socket 8710-1239
Torque Wrench 8710-1240
Standoff 2510-0115
Wrench-Retainer 07920-20090
Hub Locking Bushing 07920-60091
Thermometer 07925-60009