Hitachi RASC-4HNPE Service Manual page 234

10 Troubleshooting
Troubleshooting procedure
19
Alarm code
This alarm code is displayed when the following conditions occurs three times in 30 minutes. Indoor fan rotates less than
70 rpm for 5 seconds during operation.
(*)When the cause is checked by means of this flow chart, confirm that fan speed setting is Hi.
Occurrence of Alarm
code "19"
Check connectors
CN4 THU1
PCN7 and CN1 on IU CN8
C46
C27
PCB1
C31
C56
C28
C26
IC1
Q6
103
R63 R83 103
Check that 230 V is
NB
CN17 R80 103
Q7
NB
applied between L1 Q32
TP CN3
and N of TB1
LED4 (RED)
Yes
Yes
Is LED4 on IU
PCB1 OFF? (*1)
No
Yes
Is LED5 on IU
PCB1 OFF? (*2)
No
Is DC power
No
output of IU PCB1
normal? (*3)
Yes
Is DC power
No
output of IU PCB1
normal? (*4)
Yes
Is fan motor speed
Yes
control command to
fan motor correctly?
(*5)
No
Does fan motor
Faulty IU PCB1
Replace IU PCB1
signal to IU PCB1
Faulty fan motor
224 SMGB0091 rev.2 - 11/2015
Activation of the protection device for the indoor fan motor (RCI-FSN3, RCIM-FSN3,
RPC-FSN3)
!
RCI-FSN3
•
•
LED5 PC4
PC4-#2
RSW1 DSW6 DSW9
PCN6 PCN4 DSW3 5
EF2 CN2
L1 TP
PCN7
L3 5
SW1
DSW5 DSW4
RSW2
+
LED5
?
LED4 IC1
CN28
TR1
LED6
T1
PCN1
CN1 + THM1 THM2 THM3 THM4 THM5 CN33 CN9 CN10
HA
CN36 CN8 CN7 THU1 CN5 CN14 CN4 CN3 CN6
VDC- VCC13
CN1 VCC15 GND VCC05
Turn OFF the power source securely before connector checking. If not, it may cause
DC fan motor failure. (Built-in PCB for DC fan motor may be damaged.)
RCIM-FSN3
THM4 CN14 THM3 THM2 THM1 DSW7 CN2 PC2
THM5 C50 ZD3
ZD4
Q1
R109 Q4
NB
CN11 D32 103
CN7
EF2
Z4 Z5
HB
NB NB
D43 HB
Q21 Q22
CN10 ZD10 ZD9
R5 333
IC6 IC5
FUNC C3 PC1
Z3
R15 L3
222
CN9
222
DSW9 R16 Q23 Q20
0
ON ON
ON
1 2
1 2 3 4 5 6
DSW5 DSW3 1 2 3 4
TR1
0
ON
ON
Q35 C14
1 2 3 4 5 6
1 2 3 4 5 6 L2 IC9
C93
DSW6 RSW1 +
103 R73
Q36 + C48
102
R75 D34 C61
C68 C64
C71 R129 C84
CN28 CN27 C72
3302
R85
C67 C73
LED4
REG1
HA PC6 PC5 PC4
REG3 REG2
VCC05 VCC12 VCC15
GND1 PC4- No.2 Pin
(*1)
The electrical source for IU PCB1 is not
supplied when LED4 is turned OFF
Faulty IU PCB1
(*2)
Abnormal voltage is supplied for fan motor.
(Normal voltage: DC280V)
Faulty IU PCB1
(*3)
Measure the voltage between VCC15 and
VDC (15V±10%) by tester.
Faulty IU PCB1
(*4)
Measure following check points voltages by tester.
Between VCC05 and GND: 5V±4%
Between VCC13 and GND: 13.1V±10%
Faulty IU PCB1
(*5)
Perform the operation with disconnecting CN1 on IU PCB1. It is normal if more than
1V generates between number 3 pin of CN1 and VDC- (check point) for approx 10
seconds after starting the operation.
?
N O T E
•
Even if the operation is stopped, 0.3 to 0.4V may generate.
•
Since the control specified in "*" is performed after the 10th second from the start of
operation, it may not be possible to obtain a steady voltage after the 10th second.
No
Faulty fan motor
run?
(*6)
Yes
Perform the operation with connecting CN1 on PCB1. It is normal if several
voltages generate between number 2 pin of PC4 and VDC- (check point).
?
N O T E
Even if the operation is stopped, approx 0.2V may generate.
Is speed pulse
Yes
Faulty IU PCB1
correctly? (*6)?
No
Replace fan motor
C A U T I O N
Perform the following check after setting the air flow volume to "HIGH".
A high voltage is applied to electrical parts. Perform the check carefully to prevent
an electric shock.
N O T E
VDC- RPC-FSN3
PCN7
EFR1
R120
JPR1
JPS1
C54 VCC13 VCC05 GND PC4 VCC15 CN1
C60
R122
L5
Z2
CN6 CN3 CN4 CN14
Z1 HA
C55
CN10 CN9 CN33
C53
LED6
CN28
IC1
R108
R118
YH2
C78
RSW2
DSW4 DSW5
0
ON ON
1 2 3 4 1 2 3 4 5 6
R119
ON ON 0 ON
TP
1 2 1 2 3 4 5 6 1 2 3 4 5 6
DSW9 DSW6 DSW3
CN1 RSW1
PCN4 PCN6
CN1
LED5 (RED)
(*5)
(*6)
PC4-#2
CN5 THU1 CN7 CN8 CN36
+ L5
CN1
THM5 THM4 THM3 THM2 THM1 PCN1
T1
TR1
LED4
+
ON LED5
1 2
SW1
L3
PCN7 R S L
A B 1 2
L1
CN2
EF2
PCN4 PCN6
LED5 VDC-
Replace IU PCB1
Replace IU PCB1
Replace IU PCB1
Replace IU PCB1
Replace fan motor
Replace IU PCB1