Toshiba Strata DK24 Installation And Maintenance Manual page 296

STRATA DK FAULT FINDING
SECTION 400-096-500
SEPTEMBER 1992
Call the
Service Center
for assistance.
CHART NO. 12
DOOR PHONE FAULTS (cont.)
From
DP1
Page 23
If you short
the wires to the DP,
NO
will digital or electronic
telephone tone ring
once or five
times?
YES
Replace the
door phone.
Is
NO
the fault
cleared?
YES
Tag defective unit(s)
and return for repair.
END
-24-
From
DP4
Page 25
Is the
system programmed
NO
for the DDCB or HDCB
output the DP
is using?
YES
Verify DDCB or HDCB
strapping and wiring
(correct if necessary).
Is
YES
the fault
cleared?
NO
Replace
the DDCB or HDCB.
Program system
for Door Phone output.
To
DP5
Page 25
END
From
DP3
Page 25