AUTOMATIC TESTING OF KEL.VY S^^ ITCHING CIKCUITS 



1169 



Fig. 10 — Lower portion of lamp display panel. 



by the customer. Failure to provide this would result in fixed test cycles 

 and many more tapes, which might be similar but varying only in regard 

 to the options, would have to be prepared. Figure 10 shows the lower 

 portion of the lamp display panel with the push-pull option keys on 

 the bottom row. Directly above are the manual operation keys with 

 their associated lamps which the tester must operate to cause the test 

 set to resume the testing cycle after it has stopped for him to perform 

 a manual operation. 



A side view of the interior of the set is shown in Fig. 11. Two bays 

 each facing the opposite direction from the other are housed within the 

 cabinet and are used for mounting the crossbar switches and telephone 

 type relays which are the principal circuit components. Two doors on 



