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contains two singleshot cards having two
adjustable singleshots per card.
4.10.1 SPECIFICATIONS
The singleshots must be adjusted so that
when the input signal goes from its
negative level to its positive level, the
output of the singleshots will go to a
negative level for the following durations.
Nmnber :
SS 1
DUration:
28.0
ms
(+15.0 ms/-1.0 ms)
Lo91tion:
A-A2G7D04 ( PF021) Upper Pot.
NumQer:
SS2
Durqtion:
500 ns ( +100 ns/-100 ns)
Location:
A-A2G7D06 (PF021) Lower Pot.
Number :
SS3
Duration:
4
O. O
ms (±153)
Location:
A-A2 H7D06
(PFO 21) Lower Pot.
4 .10 .• 2 AnJUSTMENT
Refer to TYDD diagnostic routine *110.
This describes the procedure to adjust and
check the PR-KB sing leshots.
4.11 2 311
READ
CLOCK ADJUSTMENT
The 2311 read clock card is located in the
B-gate in E3-board, JS-socket.
This
adjustment procedure makes use of the write
clock signal as an input to the read clock
to allow the adjustment to be made without
using a disk drive.
Note:
Use a Tektronix* 453 oscillcscope
or
eq"UI
valent.
SCOPE SETUP
Chan 1:
B-E3J5J10 (FA 111)
Chan 2:
B-E3J5G02 (FA 111)
sync:
Minus Internal Chan 1
1.
Jllmper B-D3M5D05 to ground
COOS
pin).
This resets the chain-end and NTO-OP
latches (FA 651).
2.
Jumper B-E3J3B04 (FA 109) to B-E3K6B09
(FA 111).
This feeds write pulses into
the read clock.
3.
Jumper B-E3J5G04 (FA 111) to ground
(DOS).
This forces the read clock to
use the long time constant.
4.
SYNC minus
<->
on Channel 1.
This is
the 800 ns write pulse (Figure 4-8).
Make certain that points A and B are
exactly 8 divisions apart.
If they are
not, adjust the scope until they are.
5.
Dis play Channel 2 and adjust
potentiometer on B-E3J5 (FA 111) until
*Trademark of Tektronix, Incorporated
the 103 level of the rising clock pulse
is 640 (+0 ,-5) ns from point A.
6.
Remove all jumpers.
A
B
---E3J5Jl0
E3J5G02
Figure 4-8.
Read Clock Traces
4.12 DAC--SINGLESHOTS
4.12.1 SPECIFICATIONS
Recalibrate Time Out SS1
Recalibrate Time Out SS2
Head Conditioning SS
Index SS (
2)
Control Tag SS
4 .12 .2 ADJUSTMENI'S
16 ms
(±
53>
16 ms
(±
53)
60 us (
±
53)
400 ns
<±
53)
1.
0 us (minimum>
All singleshot adjustments for the DAC are
made while using microdiagnostic *300,
routine
6.
First, load *300, set switches
ABCD to 0106, press and release
SET
IC,, and
press and release START.
This forces a
loop on routine 6.
For the adjustment to
be performed, the sense switch specified in
the adjustment must be on.
Only one
section sense switch can be on at any one
time.
4.12.2.1 Head Conditioning Singleshot
(FAl.31)
1.
Turn section sense switch 2 on.
2.
sync the scope on 01B-E3G7D12
(negative>.
3.
Look at the output on E 3G 70 04 and
adjust to 60 us ± 53.
4.12.2.2 Index and Delta Index Sinqleshots
(FA131)
1..
Turn section sense switch 3 on.
2.
Sync the scope on 01B-E3G3D12 <neg).
3.
I.Dok at the output on E3F2D13 and
adjust to 400 ns
±
53 by varying the
20 25 FE MM ( 7 / 6 9)
4-9
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