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4.l(f.5 .• 2 Strobe Mjustment
1.
Attempt to write all bits in the buffer
<Diagnostic Routine WE15, section
*400); disregard any errors.
2.
sync the scope on '-0 x+4x Strobe SA'
(PR551)
( 01A-C3L2B04) •
3.
Observe the output of the PLBl sense
amplifier, '-0 PLB sense 1'
CPR561)
CO 1A-C3K2B02).
4.
Adjust the strobe delay singleshot in
01A-B3M2 until the sense amplifier
oot put appears.
Adjust the singleshot
potentiometer to obtain an output pulse
of maximum width.
If the maximum width
occurs over a range, adjust the
potentiometer to the center of the
range.
4.14.5.3 Vsl Adjustment
1.
IDop on the 1403 buffer voltage routine
OiE16 in Section *400), set sense
s~itches
to continue after errors, and
print an asterisk <*> only on errors.
2.
Adjust the upper potentiometer on C3L2
clockwise until an error message prints
(or until a print check occurs).
3.
Adjust the potentiometer clockwise
until the error conditions show up and
set the Vsl .1 volt more negative than
the high failure level of Vsl.
Note:
The range between the failure
points should be at least .3V.
A range
of less than .• 3V may indicate a bad
component such as a sense amplifier.
4.
The buffer should now be adjusted
properly to track effectively over its
specified operating temperature range.
If any of the buffer components (sense
amplifier,, driver, etc.)
are replaced,
the Buffer Adjustments procedure
(Section 4.14.5) must
be
repeated to
obtain optimum operation.
4.14.6 BUFFER CHECKOUT PROCEDURES
Loop the ripple print routine to test
accuracy of buff er adjustments.
4. 15 2 5 60 ATTACHMENT
4.15.1 BLOCK FEED CHECK JUMPER
When the block feed check jumper is
installed, all 2560 feed checks are
prevented.
To scope the feed and feed
check circuitry:
1.
Set up a short instruction loop
according to the type of feed check,
using MFT 72.
2.
connect the block feed check jumper
(MF
506), and load blank cards in the
selected hoppers.
Control and check circuitry can then be
scoped as desired.
Sync signals are FCB 1
to 6, trailing edge., or those signals that
initiate a feed cycle.
4.15.2 ADJUSTMENTS
4 .15. 2 .1 Sing le shots
The monitor-controlled 2560 diagnostic
coreload *820, routines UM35 and UM36,
describes the adjustment of all singleshots
in the 2560 attachment feature for both
print and nonprint 2560s.
4.15.2.2 Feed Cells
Refer to the publication., :r.t:>del 25
Pluggable Display and External Field
Definitions, and plug the display cable in
the location that brings the signal, 'any
feed cell dark,' to the indicator lights.
Adjust the feed cells as described in the
2560 FEMM.
4.16 INI'EGRATED COMMJNICATIONS ATTACHMENT
4.16.1 TIM:OOUT OSCILIA'l'OR
The timeout oscillator contains
t~
115-ms
singles hots.
The singleshots are running
continuously:
adjust each one to 115 ±5ms
while scoping the output pin.
See ALD page
HA064.
4.16.2 TIMEOUT CLOCK SINGLESHOT
The 350-ns timeout clock singleshot is
stai.ted every 460 ns., and should be
adjusted to 350 ±35ns while scoping the
output pin.
See ALD page HA064.
4.16.3 SYSTEM RESEI' SINGLESHOTS
There are two 5-microsecond system reset
singleshots.
One is started by the system
reset switch on the console (Note 4 on
ALD
HA064).
The second is used by the ICA
microdiagnostics and can be scoped
by
looping the entire section or any routine
in *700 (Note 5 on ALD HA064).
4.16. 4 A-CLOCK SINGLESHOT
There is one 2. 5-micro second A-clock
singleshot per start/stop base board..
The
singleshot runs continuousl¥ and can be
adjusted while the output pin is being
scoped.
See ALD HA137 for EIA boards
CB-Xl).
See ALD HA337 for TI.G boards
(B-Yl).
2025 FEMM (7/69) 4-13
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