FAULT REPAIR PROCEDURES

9. FAN UNIT FAULT

This section explains the fault repair procedure where a fan in the Fan Unit (FANU) does not operate.

9.1 Check Point

(1)When repairing a FANU fault, exercise care about the following conditions. The fans (a total of 3) are activated by operating the PWR SW key located on the PZ-M369. The conditions for starting the fan are as follows:

With PWR SW key for the fan set to ON position:

With PWR SW key for the fan set to AUTO position:

Always operating

Starts operating if the in-frame tempera- ture is higher than 40°C (104°F); stops op- erating at temperatures lower than 32°C (90°F). See Figure 5-19.

(2) When replacing the FANU with a spare, refer to Section 4., Fan Unit Replacement, in Chapter 4.

 

 

Fan Unit

 

 

Thermal Unit

 

 

 

 

 

 

 

 

 

 

FAN 0

FAN 1

FAN 2

Thermal

Thermal

Thermal

Thermal

 

 

 

 

 

 

 

Relay

Relay

Relay

Relay

 

 

 

 

 

 

 

32o C

40o

C

70o

C

60o

C

 

 

 

 

 

 

 

89o F

104o F

158o F

140o F

 

 

 

 

FC0

FC1

FC2

 

 

 

 

 

 

 

 

 

 

1

FUSE ALM

POW

 

 

 

 

 

 

 

 

 

 

FUSE

 

 

 

 

 

 

 

 

 

 

 

3

-48V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

To PIM

4

G

 

 

Power

 

 

rl

 

 

 

 

 

 

 

Filter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

FE

 

 

 

 

 

 

 

 

 

 

 

 

 

FAN

RL

 

 

 

 

RL

 

 

 

 

 

 

ON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

AUTO

rl

 

 

 

P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

rl

 

 

 

 

 

 

 

 

 

N

 

 

 

 

 

 

 

 

F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FAN START Switch

 

 

 

 

FA

 

 

 

 

 

 

 

 

 

 

 

G

FE

LM

-48V

E

MN

MJ

 

 

 

 

 

FAN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

To PIM

 

To Display

 

 

 

 

 

 

 

 

 

 

 

 

Section

 

 

 

 

 

 

 

 

 

 

 

 

of TOPU

 

Figure 5-19 Circuit Diagram of Fan Unit and Thermal Unit

CHAPTER 5

NDA-24300

Page 374

Issue 1

Page 401
Image 401
NEC NDA-24300 manual FAN Unit Fault, Circuit Diagram of Fan Unit and Thermal Unit