Sanyo PLC-ET30L, Service Manual

Page: 82 / 154

-8-
Troubleshooting
IC301 SCAN
CONVERTER
&
SY
STEM
CONTROL
67
D[0-7] D[0-7]
68 8
3
K8A
K66A
K8J
K66J
9 5 6 8 5
10 12
4 2
145 251 146 33
17 11 15 14
65 176 66 444 355
9 6
5
6
11 13 3 1
108 80 107 105 104 103
SD
AT
A_I/O
2
THERM1_DETEC
T
LA
MP
_D
C_
ON
_E
X
FPGA_PWM
FA
N_
PW
M
15V_SW_E
X
LA
M
P_
D
C_
O
N
15V_S
W
FA
N_SW_1
FA
N_SW_2
FA
N_
DA
C1_P
W
FA
N_SPEED
1
FA
N_
M
TR1
FA
N_
M
TR2
FA
N_
M
TR3
FA
N_
M
TR4
FA
N_
M
TR5
FA
N_SPEED
2
FA
N_SPEED
3
FA
N_SPEED
4
FA
N_SPEED
5
FA
N_
DA
C2_P
W
FA
N_
DA
C3_P
W
FA
N_PWM_K8J
FA
N_SW_1E
X
FA
N_SW_2E
X
SD
A0_S5V
SCL0_S5
V
PW
_S
DA
0
PW
_S
CL
0
IC188
1
INPUT
EXP
ANDER
<T
C74
LC
X541
>
IC8841 THERMAL SENSO
R
<MCP9801>
IC4801 INVERTE
R
IC861 BUFFER
<T
C74
LC
X541
>
IC7821 INVERTE
R
<74L
VC
14
AP
>
IC7201 FPGA
K66H
1 3
K8E
TH901
THERMIST
OR
(ROOM)
(LAMP
)
(Sensor B)
1
3
FN905 (PANEL) INT
AKE
K66G
1 3
FN904 (PANEL) INT
AKE
K66F
1 3
FN903 (LAMP
)
INT
AKE
K66E
1 3
FN902 (POWER) EXHA
US
T
K66D
1 3
FN901 (LAMP
)
EXHA
US
T
MAIN
POWER(DC
)
K8F
TH902
THERMIST
OR
(B-P
ANEL)
1
3
33 37 11 12
2 3 4 5 6 7 8 9
10
1 2 3 4
THERM1 THERM2
THERM2_DETEC
T
IC1801
I/O
EXP
ANDER
<TE7783>
(Sensor A
)
(Sensor C
)
Q1361 Q1363
No Power
(Check fan control stage)
If one of the fans has an error,
both of signals LAMP_DC_ON and
15V_SW become "Low" to stop the
operation of power supply circuit.
Check FAN_SPEED
feeed back signals.
L: Failure
These fans are con-
trolled by the DC voltage
of signals FAN_DAC1_PW,
FAN_DAC_PW, FAN_DAC3_PW.
These fans are controlled by
the pulse ware duty ratio of
the signal FAN_PWM_K8J.