Mol 860 Tape Write Diagnostic - IBM 5100 Maintenance Information Manual

MOl 860 Tape Write Diagnostic
This MOl tests all the tape write functions of the internal and
the 5106 Auxiliary Tape units. It also analyzes all failures
except erase as shown in the following chart. Be sure to
record the tape status on at least the first failure. Refer
to the tape status byte information in this section.
Enter
MDI 860 Tape Write
Tests: Tape write head and circuits
Analyzes to:
Velocity
Acceleration
Deceleration
Write/read back
Symmetry (See Note 1 )
Peak shift (See Note 2)
Read/write head azimuth (See Note 3)
Binds in customer cartridge (See Note 4)
Notes: The following notes are for instructional purposes
only. The drawings are not meant to be scope pictures
as the diagnostics are designed to check the tolerances.
1. Symmetry - The bit cells are of equal duration. This is
a function of the tape read/write channel. The tape
velocity tested OK in a previous routine.
Raw Data
Clock
--.--
Bit Cell
Clock Clock
2. Peak Shift - The timing shift of the analog signal peaks
is due to the bit pattern and to the tape to read/write head
relationship. This is a function of reading tape.
3-88
861 - Analyzes
t~.
erase
c
o c
c
o
c
,
Undistorted
I :
I
I
Raw Data
I I
' :
:
1 I I I
I I I I :
----1-, r---,
I----J
,..--1.,
r-----'
r---
I
I I
LJ
tJ ; t
J
LJ
I
LJ
I
Peak Shifted
1
Raw Data
I
3. Azimuth - The physical angular alignment of the
read/write head gap with the recorded transitions on
the tape. It is similar to skew, but due to recording
data serial by bit and by character (as apposed to
parallel recording on 7 and 9 track tape) it is referred
to as azimuth.
4. Binds in customer cartridge - All tape write tests
must run satisfactorily with the diagnostic cartridge
prior to inserting the customers cartridge.
,I'"
'\..
/