Table of Contents
Advertisement
Troubleshooting and Diagnostics
7936 and 7937
Table 8-3. Servo System Test Connector AIJ3, Mnemonics (4 of 4)
PIN
NO.
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
8-44
MNEMONIC
DTO-L
SPOS
TRCSjS
TESTEN-L
AGCF-L
ABORT
GBDEN-H
SAGC
FSEN-L
OFTU-L
DAGC
DPOS
INDEX-H
SRTF-H
TRKCR-H
SIGNAL
Dedicated
Timing
Only
Sampled
Position
Track
Crossing
Diagnostic
Mode
Enable
AGC Fault
Abort
Guard
Band
Enable
Sampled
AGC
Fine
Servo
Enable
Off Track
Unlatched
Dedicated
AGC
Dedicated
Position
Index
Servo
Timing
Fault
Track
Crossing
DESCRIPTION
Tie low to servo from dedicated surface
only. Used to measure runout and skew.
Sampled B dibits minus sampled A dibits
to give sampled track following.
Track crossing divided by 5 when seeking
fast; track crossing when seeking slow.
Comes from diagnostic mode switch at
rear of drive. See chapter 3 for details.
Active when sampled AGC level falls too
far below or above a reference.
Output for test only.
Switches between guard band detection
and sector mark detection.
Clocked and integrated SLVL used for
AGC of sampled servo.
Output of servo controller indicating that
the servo system is in fine servo (track
following) mode.
Goes low when off track, and high when
ontrack.
Clocked and integrated DL VL used for
AGC of dedicated servo.
Dedicated A bits minus dedicated B bits.
Indicates that the Index mark has been
detected. Index is two sector marks
oc-
curring during one sector.
Combination of TERI-L and TER2-L.
Goes high when crossing a dedicated
track.
Advertisement
Table of Contents
