Avaya Definity SI - Page 1110

Maintenance Object Repair Procedures
555-233-123
10-324 Issue 4 May 2002
in parallel with a rear fan. The repair scenarios that follow rely on the technician’s
ability to distinguish between high fan speed and low fan speed. The only way to
distinguish between the fan speeds is by the sound of the fans. When operating at
high speed, the fans make a higher pitched sound than when they run at low
speed. The technician probably knows from prior experience what the fans sound
like at low speed as well as at high speed.
Figure 10-10 shows a multicarrier cabinet system and the location of the
temperature sensors S1 through S4 (there are actually two S3 sensors and two
S4 sensors) as well as the location of the fans, the AHD1 circuit pack, and the
filters. The figure also shows other environment-related components of a
multicarrier cabinet system and can be ignored for this section on Cabinet
Sensors.
Figure 10-10. Multicarrier Cabinet Environment Components (CABINET)
[Non-Variable Speed Fan Option]
631
DA
CARRIER A
FILTER
A
H
631
DA
631
DB
631
DB
CARRIER B
F
L
O
W
S4
FILTER
AC
AC
AC
A
FANS -3 FRONT
3 BACK
F1
D
S4
1
S2 S3 S1
631
DA
AC
F3
CARRIER C 631
A
I
R
DB
AC
F2
631
DA
631
DA
631
DB
631
DB
F4
CARRIER D
CARRIER E
I
R
F
L
O
W
DC
FUSE F1-F7
F5
F6 F7
DC
BATTERY
CHARGER
BATTERY &
AC
DIST.
RING
S3
GENERATOR
ON BACK OF
PDU, FUSE
F9 ON FRONT
OF PDU
F9
POWER DISTRIBUTION UNIT