Cable And Card Locations; Card Sockets; Actuator (Access) Speed Adjustment - IBM System/34 Maintenance Manual

09-130 CARD SOCKETS
CAUTION
Do not bend or break the pins when removing or
inserting cards. Broken pins make it necessary to
exchange the disk enclosure.
The card sockets are located on the front right of the
disk enclosure. To remove or reinstall cards, remove the
card socket cover
e.
2
3
4
5
6
D-W1
A
Speed Trans-
ducer, Brake
Sense, and
Actuator
Drive Coil
Cable
Data
AGC
and
Detector
Card
B
Servo
Preamp
Cable
(coaxial)
Read/write
Logic Cable
(tape)
Read/write
Data Cable
(coaxial)
R/W
=
Read/write
AGC
=
Automatic Gain Control
See FSL page AC350 (disk drive A) and FSL page AC360
(disk drive
B)
for the correct card and cable part numbers.
32
09-140 ACTUATOR (ACCESS) SPEED
ADJUSTMENT
Adjustment
Note: To verify a present adjustment, go to step 8. If
the G2 card has been changed, start at step 1.
1.
2.
3.
4.
5.
6.
09-130
Locate the actuator control card (A2G2 disk drive
A, A3G2 disk drive B) in the logic gate assembly.
Note the 10 turn potentiometer and the two red
light emitting diodes on the top half of the card
(looking toward the end. of the card opposite the
board pin contacts). See paragraph 09-120 for
cable and card locations.
To ensure a center range setting of the
potentiometer adjust 10 turns clockwise, then five
turns counterclockwise. This sets the actuator
speed high enough to let the actuator seek home.
Load DIAGB1 and select Exercisers.
Select device:
Disk drive A or disk drive B.
Note: Only the devices specified in the machine
configuration are in the menu. Disk drive B can be
selected in step 5 if it is not in the machine
configuration.
Select command.' Access Timing Module' (access
speed adjustment test).
Note: Command option 1 may be used to select
disk drive A or disk drive B if they were not
selected during step 4.
Select 'E'.
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