
SECTION 5 1 8-41 1- 1 00
IS DIAL TONE
PRESENT
YES
NO
SEE PROCEDURE
FOR NO DIAL
TONE
Page 40
BSP 518-41 1-100-i01 1978-08-40.jp
CHECK OPTION
PLUGS ON 486A
KTU
TROUBLE
CLEARED
REPLACE
486A KTU
YES
TROUBLE
CLEARED
NO
REPLACE
485A KTU
Fig. 1 4-No Audible Ringback
TROUBLE
CLEARED
PERFORf'l
DIAGNOSTICS
TEST NO. 2
YES