Service manual

SA7x Technical Description

2.3 SA7x Fan Assembly

The SA7x fan assembly consists of an axial fan mounted in a case. The fan

assembly slides into a recess in the center portion of the frame and is secured

with four mounting screws, as shown in Figure 2–3.

Connector J1 on TB2 supplies +12.6 Vdc to the fan. Other fan-related signals

in this connector include the fan control signal to the fan and the fan rotation

sensor signal from the fan. The fan rotation signal is processed on TB2 for fan

speed control. A fan failure signal, derived from fan rotation, is sent to the power

supply.

Figure 2–3 SA7x Fan Assembly

FAN

MOUNTING

SCREWS

(4 PLACES)

LATCH

FRAME

FAN

CABLE

FRAME

SHEET

METAL

CXO-2613B

SA7x Technical Description 2–5