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4054 DISPLAY CONTROLLER MODIFICATION # 39763 CORRECTION
Please refer to March 21 ,
1980 Issue 10-6 page 22 Wizards Workshop .
In
the article ,
" 4054 DISPLAY CONTROLLER MODIFICATION # 39763 " ,
it states
that the Display Controller part number will
go from a 670-5672-00 to
670-5672-01 .
This statement is incorrect , the board level
should change
from a 670-5672-01
to a 670-5672-02 level
after MOD # 39763 is implemented .
--Darrell
McGiverin
63/503 , ext .
3786
4054 OPT .
30 VECTOR GENERATOR & DISPLAY CONTROLLER INTERACTING PROBLEM
There have been two cases of 4054's ( with Option 30 installed ) demonstrating
an undesirable problem when operating in a refresh mode .
The symptom of
this problem occurs as
follows .
The 4054 may draw some unwanted vectors
and hang busy .
In addition , when the machine hangs busy , the Z axis may re
main on , causing the CRT to be damaged .
This problem is caused by interaction
between the Vector Generator ( 670-5666-01 )
and Display Controller,
( 670-5672-02 ) ,
and is only apparent with Option 30 installed .
To date there is no defined
solution , other than changing either one or both of the boards .
C
The source of the problem has been identified and as soon as a modification
is completed it will
be documented in the Wizards Workshop .
--Darrell
McGiverin
63/503 , ext .
3786
CLUTCH AND CONTROL BOARD MODIFICATIONS # 37349 , 40065
4631 / 32 / 33A / 34 :
AND 40750
4633A
To use the available 105-0519-00 drive roller clutches in the 4633A
Continuous Recorder ,
the clutches were screened for a low pull - in voltage .
Those meeting the requirements were part numbered 105-0519-01
and used in
the 4633A .
The continuous duty cycle , however , raised the possibility of
the clutch coil
overheating .
To correct this , MOD 37349 has been implemented .
The internal
resistance
of the coils in both the 105-0519-00 and 105-0520-00 has been
increased
from near 90 ohms to about 145 ohms .
The new part numbers are 105-0519-02
for the drive roller clutch ( L1020 )
and 105-0520-01
for the cutter clutch
( L1022 ) .
In addition , Ri
on the 4633A control
board had been changed from 471 to
2782.
This
increased the voltage applied across the drive roller solenoid ,
L1020 .
It also rolled the
control board part number from 670-4599-06 to
670-4599-07 .
It was found that low - line conditions could still
cause the
drive roller clutch flapper to fail
to pull
in .
( continued on the following page )
-30
June 27 ,
1980
Issue 10-13
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