Magnetic Stripe Reader; Magnetic Stripe Reader Voltage And Control Mini-Map; Conditions After Power On; Service Aids - IBM 5251 Series Maintenance Information Manual

Magnetic Stripe Reader
115
MAGNETIC STRIPE READER VOLTAGE
AND CONTROL MINI-MAP
• Use this mini-MAP to correct an MSR problem when
the reader fails to read and the characters displayed
from the keyboard are correct.
• For mini-MAP example, see Troubleshooting Aids
(212).
Conditions After Power On
• The voltage lines are active.
• The' -POR' line will be at an Up level.
• The' 1.0 MHz osc' line will be pulsing after power on.
• The '+photocell' line will pulse when a card is read by
the MSR.
• The 'reg 25 bit l' line will change level when a card
is read by the MSR.
Service Aids
• The' - POR' line will change level during the
power-on sequence.
• The display station will not be damaged if it is
powered on after the MSR cable has been
disconnected.
• The MSR test card part number is 8331402.
• The characters that will be displayed in the lower left
portion of the display screen when the test card is
read by the reader when the display station is in the
free key mode are:
% % % 0123456789 % :@'=0123456789
115
Tools
Connect the CE probe as follows:
• + lead-1-G-003
• - lead-1-G-008
• Ground-1-B-D08
Maintenance Procedures 5251 MIM 1-15