Toshiba Strata DK 280 Installation Manual page 656

Flowchart 12-4
CO Line Dial Tone Faults
(See Chapter 1
l-T1
Interface for RDTU Faults)
c-K7
1. Check CO line wiring per
Chapter 7-Wiring Diagrams.
2. Test central office line using a
standard telephone or butt set
at the TELCO block.
Repair as necessary.
1
&YES _
(-27~
cleared? /-
on a replaceable
NO
Replace the defective
unit and return it to the
1 repairrter. 1
(,,,)
Test the cabinet power
SUPPLY per
Section 12.5.
Check the common
control PCB per
Section 12.4.
Retest.
Replaceable CO Line PCBs
PCOU, RCOUIRCOS,
RGLU, RDDU, PEMU,
REMU
(See Chapter 1 l-T1
Interface for RDTU faults)
January
1996