User-Selectable Options; Options - Tandon TM848-1 Operating And Service Manual

1.18 OS AND HL POWER SAVE OPTIONS
The drive is set up with the H L option in. This stepper power from head load line option supplies power
to the stepper motor when the head load line goes low (true), which results in lower stand-by current
consumption. As shipped from the factory, H L is installed but will remove power from the stepper
motor when the drive is deselected. There should be a 20 millisecond wait after a Drive Select
command is given in order to allow the step motor electronics to settle.
The stepper power from drive select, OS option, allows the user to remove D. C. power from the
stepper motor using drive select, which results in lower stand-by current consumption. This option is
implemented by installing OS, and cutting HL.
1.19 USER SELECTABLE OPTIONS
The description of user selectable options should be used in conjunction with the following list of
options that are available for model numbers TM848-1 and TM848-2 (see Table 1-5).
TABLE 1-5
OPTIONS
AS SHIPPED
TRACE
Shunt/Pin Not
OPTION
DESIGNATOR
Locations
Installed
Installed
Drive Se lect
DS1-DS4
DS1
Side Select Options using Drive Select
1B-4B X
In Use, Drive Select
Z
U3,1-16
X
In Use, Head Load
Y
X
Ready Alternate Output Pad
R U3, 7-10 X
Radial Ready
RR
X
Ready, Modified
RM X
Radial Index
RI X
Index, Alternate Output Pad
I
U3,6-11
X
In Use, Alternate Output Pad
0 X
Diskette Lever Lock Latch Option
DL X
Disk Change
DC X
Two-Sided Diskette Installed
2S X
Stepper Power from Drive Select
OS X
Stepper Power from Head Load Line
HL U3,2-15 X
Head Load Alternate Output Pad
C
X
Radial Head Load Signal
A U3,3-14 X
Radial Head Load Signal
B U3,4-13 X
Radial Head Load Signal
X U3,5-12 X
Inhibit Write When Write Protected
WP
X
Allow Write When Write Protected
NP X
Head Side Select Options
S1-S3
S2
Spindle Motor Control Options
M1-M4 M1, M3 M2, M4
Motor Control Select MC1-MC4 MC1
1-17