Teletype 43K001/AAA, Repair Manual

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MANUAL 525, 2-1
PART 2- TROUBLESHOOTING
CONTENTS
A. GENERAL ............................................................... .
B. TROUBLESHOOTING ...................................................... .
PAGE
2-1
2-2
1. 43K101 KEYBOARD TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2
2. 50K122 UNITIZED KEYBOARD TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
3. 43K001 RO KEYBOARD TROUBLESHOOTING ............................... 2-15
A. GENERAL
This
section provides troubleshooting information for the Basic 43 keyboards (KSR and RO).
Keyboard troubleshooting is initiated by the 43 Basic KSR Teleprinter or 43 RO Teleprinter Trouble­
shooting, Service Manual or when trouble in the keyboard is suspected from symptoms observed.
Analysis in this section is limited to isolating the trouble within the keyboard up to its electrical interface
at the logic card. The 43 keyboard must be tested as part of a Basic KSR or RO Teleprinter Station. Refer
to the Teleprinter Testing section of the Service Manual. Where analysis indicates the trouble is not in the
keyboard, return to the Teleprinter Troubleshooting section of the Service Manual for further analysis.
When a trouble is verified to be in the keyboard (by replacement of the keyboard) this section should be
used to help isolate the trouble to any replaceable components to correct the trouble.
The keyboards are returnable to the Teletype Product Service Center for repair as a unit. Pack in carton
(KSR keyboards- using conductive plastic bag) that was used to pack replacement keyboard. High vol­
tage static discharge can damage KSR keyboard circuitry. The 346392 wrist strap is available to ground
service personnel.
Isolation and correction of trouble is based on electrical and mechanical checks and parts replacement.
Trouble analysis is presented in the form of a "20 Questions" routine in 2. TROUBLESHOOTING GUIDE.
The guide, with questions and yes and no columns, should be used always starting with the first question
and proceeding according to the "yes" or "no" directive.