HP HP-97 - Page 149

[ Hevs CORVALLIS DIVISION 97-101
PACKARD SERVICE NOTE
Page 6 of 7
(...continued)
Supersedes:
4.
Hints
A. Some of the problems that have been blamed on bad head frame
assemblies are really caused by bad head switch adjustments.
The head switch puts the first small mark on the card and is
a big problem on card readers. Adjusting the head switch will
change the position of the start bit.
-— X —
— MiN |
Start Bit\b S
|
BS
SN
T
Y
A
N
‘\.Leading Edge
B. Many card readers with slow motor speed will return to normal
with proper lubrication and current adjustment.
C. Protected cards can be rerecorded by the following procedure:
i. Load the correct program into the calculator.
ii. Ground the write protect switch (Pin 15 on HP-67) (Pin 13 on
HP-97).
jii. Record the program onto the protected card.
This can be done with cards that were improperly recorded and then
protected. Make sure the card reader that is used is in good
condition with proper motor speed and start bits. The ground
connection to the write protect switch must be opened and reclosed
each time that this procedure is used or it will cause error to be
displayed and will not work.
(continued...)
For more information, contact the Service Engineering Manager, Corvallis Division—1000 N.E. Circle Bivd., Corvallis, Oregon 97330
Telephone (503) 757-2000 ¢ TWX # 510-596-0683
Printed in U.S.A.