Mitel sx-100 User Manual page 83

DC/DC CONVERTER
POWER IS
NIGHT - 4 a v
CONTROLLED BY
BELL NIGHT
SVSTEM POWER
TB2.4
6-4 SX-200
Figure Back Door
6.08 When troubleshooting the systems for power failures, the Pow-
er Supply Block Diagram (Figure 6-7), and Charts 6-l through
6-10 should be consulted. The charts outlined cover the trouble and its
effect on the system. In most cases the repair person will be directed
to a specific MAP for remedial action. Under the heading "Check", a yes
answer to the question asked is an indication to go on to the next
question in the "Check" column. If a no answer is encountered, the
repair person should.go to the "Action" column and follow the instruc-
tions listed there. There is also a column indicating (by an X) to which
system the action applies. Above all, it must be remembered that fuse
replacement is not a remedy. The probable cause of a power failure
should be determined before the system is powered-up. Utilizing the
information provided in this Section and the MAPS referred to in Charts
SECTION MITL91 OS/91
CONVERTER INPUT LED
,
BELL
F U S E
TB2.1 Tf32.3
I
OPTIONAL
R E S E R V E
BATTERY
Electrical
Schematic
AC
P O W E R
L E D
EA
A B R K E R
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