Topic ID: id_17479571
Version: 2.0
Date: Jun 10, 2020 2:27:58 AM

CFC (Common Fan Controller) Troubleshooting (5447103)

1 CFC Switch

Set S1_SERVICE to ON, CFC will work on service mode, and control top fans, heater and blower manually by setting corresponding key.

Table 1. S1 Switch
Switch	States	Description
Service Mode	OFF	CFC work normal
Service Mode	ON	CFC work on service mode
Blower	ON (Only on service mode)	Turn on blower
Heater	ON (Only on service mode)	Turn on heater (Note: Heater can’t be ON when blower is OFF)
FAN_1	ON (Only on service mode)	Set top fan1 to blow at 50% speed
FAN_2	ON (Only on service mode)	Set top fan2 to blow at 50% speed
NC	Reserved switch
Debug	Reserved debug switch

2 LEDs

Check states of CFC working by observing DS1~DS8.

Table 2. LEDs
LEDs	State	Description
DS1	Service	Light when CFC working on service mode
DS2	Debug	Light when CFC working on debug mode
DS3	Blower	Light when blower in on
DS4	Heater	Light when heater is on
DS5	FAN_1	TBD
DS6	FAN_2	TBD
DS7	Diagnostic	Light when CFC is doing diagnostic
DS8	on the box silkscreen	Blink when FPGA works normal state in frequency 1 second
DS9	on the box silkscreen	Light when board 3.3V is on
DS10	on the box silkscreen	Light when board 2.5V is on

3 Test Points

Table 3. Test Points
Point Sorts	Description
Power Test Points	TP17 (24V), TP18 (3.3V), TP19 (1.2V), TP20 (2.5V)
Ground Test Points	TP11, TP12
Signal Test Points	TP1 (Heater), TP2 (Blower), TP3 (Fan1_TACHO), TP4 (Fan2_TACHO), TP5 (Fan3_TACHO), TP6 (Fan4_TACHO), TP7 (Fan1_CTL), TP8 (Fan2_CTL), TP9 (Fan3_CTL), TP10 (Fan4_CTL)