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5. Set READ/ACCESS/WRITE switch to ACCESS.
6. Set R/W ONLY RESET switch to neutral.
7.
Set REPEAT/SINGLE switch to desired
mode.
8. Set START/STOP switch to START.
9. If REPEAT/SINGLE switch is set to SINGLE,
one seek is made for each START/STOP
switch actuation.
Return START/STOP
switch to STOP when move is completed.
If REPEAT/SINGLE switch is set to
REPEAT, actuator will sequentially move
to cylinder 000 and stop.
10. Set START/STOP switch to STOP.
Head Selection
1. Select a specific head as follows:
a. Set mode select switch to HEAD.
b. Set INPUT switches (16 through 1) to
desired head number.
c. Actuate LOAD/SEQ BEADS switch to
LOAD and let return to neutral posi-
tion.
The selected head will be
used for all operations.
NOTE
Head register will be cleared
automatically after a RTZ step.
Read Operations
Read operations are primarily address-
oriented.
The tester compares the cylinder
address read from the disk with the current
cylinder address.
If an error occurs, execu-
tion stops.
Read Gate stays up for the
remainder of the track.
When comparing
cylinder addresses set DISPLAY SELECT switch
on maintenance panel to ADDRESS VERIFY.
Panel indicators then display cylinder ad-
dress read by tester.
If performing a repeat
read without accessing (R/W ONLY) indicators
may appear to be blank.
This is because the
lamp drivers cannot react fast enough to
display data inputs.
Display may be obtained
by setting START/STOP switch to STOP or
performing a single access/read operation.
The data pattern read from the disk is NOT
compared with the loaded pattern in the
tester.
Pattern read errors will therefore
not be detected by the tester.
If it is
necessary to observe read waveforms within
drive, connect oscilloscope vertical inputs
to desired test points.
Sync positive on
DATA SYNC jack on tester rear panel.
Display
is initiated at leading edge of first data
bit.
Because of timing variations and pro-
pagation delays, first bit may be missed so
that display starts at second bit.
83318200
C
A read operation can be performed in conjunc-
tion with a seek operation or separately.
If
performed with a seek operation, the seek is
completed first, then the track is read.
Read One Track
To read one track perform the following
step~
1. Set READ/ACCESS/WRITE switch to READ.
2. Set REPEAT/SINGLE switch to SINGLE.
3. Set R/W ONLy/REsET switch to NEUTRAL.
4. Select desired head as described in
Head Selection procedure.
s.
Access to desired track as described in
Seek Operations.
6. To read track again, actuate START/STOP
switch.
Repeat START/STOP step for
each read operation.
To select new head on same track without
accessing perform the following steps:
7. Set R/W ONLY /RESET switch to R/W ONLY.
8. Select desired head as described in
Head Selection procedure.
9. Set START/STOP switch to START.
To read
that track again, actuate START/STOP
switch.
Repeat START/STOP step for each
read operation.
.
To
read continuous with one head without
accessing perform the following steps:
10. Set REPEAT/SINGLE switch to REPEAT.
11. Set START/STOP switch to START.
Track
will be continuously read until START/
STOP switch is set to STOP.
Read More Than One Track
To read more than one track perform the
following steps:
1. Set READ/ACCESS/WRITE switch to READ.
2. Set REPEAT/SINGLE switch to REPEAT.
3. Set R/W ONLY/RESET switch to NEUTRAL.
4. Select desired head as described in
Head Selection procedure.
s.
Select desired seek as described in
Seek Operations.
6. Tracks will be continuously read until
START/STOP switch is set to STOP.
2-13
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