Fan Control Circuit - Sanyo PDG-DXL2000 Service Manual

Chassis Block Diagrams

Fan control circuit

12
FAN_CONT1
13
FAN_CONT2
14
FAN_CONT3
IC7881
DAC
<M62393>
15
FAN_CONT4
4
FAN_CONT5
5
FAN_CONT6
2,3
135
143
98
SCL2_DAC
SDA2_DAC
Q7871
Q7872
223,304
16VF
Q7811
Q7821
Q7831
Q7841
Q7851
Q7861
Q7801 Q7802
FAN_SW_BUFF
PFAIL LOGC ICs
PFAIL
IC5851, IC5852
Error: H
SIGNAL/MODE
POWER-ON STAND-BY
FAN_SW_BUFF
H
POWER-ON STAND-BY
LAMPCTRL
H
NORMAL ERROR
PFAIL
L
<LAMP>
IC8821
TEMP.
SENSOR B
<MCP9801>
2 1
SCL2
SDA2
D7811
IC7811 FAN1
D7821
IC7821 FAN2
D7831
FAN3
IC7831
D7841
FAN4
IC7841
D7851
FAN5
IC7851
D7861
FAN6
IC7861
Q7891
PFAIL_FAN
Error: L
Fan Error: H
Fan Error: On
L
IC4721
L
NAND
2
H
1
LAMPCTRL
TEMP SENSOR 1
<ROOM>
IC8801
TEMP.
SENSOR A
<MCP9801>
2 1
4 3
K8E
-37-
K8F
1
2
D7812
K8B K07A
K77B
9
1
2
D7702
K77C
11
1
2
D7703
K77D
13
1
2
D7704
K77E
15
1
2
D7705
K77F
17
1
5
2
D7706
K47A
4
K47B
2
1 1
40
FANNET
4
3
TEMP SENSOR 2
<DMD>
IC8811
TEMP.
SENSOR C
<MCP9801>
2 1
4 3
K8H
MAIN
FN901
FN902
FN903
FN904
FN905
FN906
LAMP
BALLAST
BOARD
SW901
LAMP
COVER
SW