363-205-401
Conversions: DLP-519
Issue 7, March 1997
Page 3 of 4
18. Replace RT channel unit and repeat this procedure from Step 5.
19. At RT, look for tip and ring reversal and repeat from Step 15.
20. At RT, lift telephone handset during ringing.
21. At RT, does ringing trip normally?
If YES, then proceed to Step 23.
If NO, then continue with Step 22.
22. Replace RT channel unit and repeat this procedure from Step 5.
23. Is this the last designated channel to be tested?
If YES, then continue with Step 24.
If NO, then proceed to Step 3.
24. Is TBCU (test bus control unit) available for use in testing channels?
If NO, then proceed to Step 33.
If YES, then continue with Step 25.
25. Request that Repair Service Bureau or Local Test Desk perform necessary
channel tests using TBCU.
26. Did tests pass?
If YES, then proceed to Step 32.
If NO, then continue with Step 27.
27. Check test connections and correct if needed. If connections are correct,
replace RT channel unit. Repeat Step 25 and continue with Step 28.
28. Did tests pass?
If YES, then proceed to Step 32.
If NO, then continue with Step 29.
29. Make sure TBCU is working properly and that you are using proper proce-
dures. Repeat Step 25 and continue with Step 30.
30. Did tests pass?
If YES, then proceed to Step 32.
If NO, then continue with Step 31.