HP HP-97 User Manual

Component-Level Maintenance HP-97
4-36. CARD READER TROUBLESHOOTING
J-37. To repair a malfunctioning card reader follow the troubleshooting
procedure given in table 4-15. Refer to the card reader exploded view
in figure 6-3 for aid in disassembly.
4-38. When removing or reinserting the card reader cable, use the HP-91/97
connector tool (part number T-155435) as described in section 3-24, step 6b.
4-39. Note that the HP-97 card reader is a precision electromechanical
assembly comtaining several small and delicate parts, HANDLE WITH CARE!
During disassembly and reassembly, be sure the card reader motor is facing
upward; otherwise small parts may fall out,
J-40. Avoid excessive handling of the leaf switch contacts on the card reader
frame assembly: dirt or grease on them prevents proper electrical contact.
During reassembly, clean them while the head assembly is separate from the
card reader support by lighly rubbing the contacts with a soft pencil eraser.
Rub each only toward the end of the ccontact. If any of the switch contacts
are bent, replace the leaf switch contacts rather than attempting to bend
them into place.
4-41. When the card reader motor speed cannot be adjusted to within proper
limits, as described in the procedures of table 4-15, the eccentric cam must
be replaced and/or adjusted as follows;
a. Carefully unsolder the red motor lead from the card-read printed circuit
assembly and connect a current meter between the lead and its pad.
b. Insert a card into the card reader slot until the motor engages and
starts to pull the card, but do not allow the card to be pulled through.
c. Adjust the eccentric cam (see figure 6-3) until the current meter reads
180 +-20 mA.
d. Perform the fine ad justment of motor speed using the procedures of table
4-15,
4-30

HP HP-97 Specifications

General

Brand	HP
Model	HP-97
Category	Calculator
Language	English