Hitachi RAS-8.0HNBRMQ1 - Checking Method for PCBA of 7~12 HP

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3.2 Checking Method for PCBA of 7~12HP
(1) Checking Method of Outdoor Unit PCB
Check the power circuit on O.U.PCB in following procedures. Refer to the gure on next page about the
positions of LEDs, fuses, and check points. Refer check points by a circuit tester and judgment value as well.
●
Pay attention to an electric shock when the voltage is measured by a circuit tester.
●
Do not contact the test lead to unspecied check points when measuring by circuit tester. It may cause
failure of terminal and circuit tester.
●
When the voltage is measured by a circuit tester, the range should be set within the DC voltage
measurement. If the setting is not correct, it may cause failure of O.U.PCB and circuit tester.
*1) The following table shows the check points and the normal range of voltage in case that the voltage on
O.U.PCB is measured by a circuit tester. The setting of circuit tester shall be set within the DC voltage
measurement range when the following voltages are measured.
Check Point
Normal Range (V)
(+) Side of Tester (-) Side of Tester
5V
GND
4.8VDC ~ 5.1VDC
12V 10.5VDC ~ 13.5VDC
CAUTION
!
Turn ON outdoor unit
LED4 (Red) is turned ON.
Is fuse EFR1
blown out?
Change the fuse
Yes
No
AC Power is lower than
90% of the rated voltage
Check the voltage
Failure of AC Power
Circuit
DC5V-Driver is applied
between Vcc05 and GND.*1)
DC5V-Driver system is
normal.
DC12V is applied between
Vcc13 and GND.*1)
DC12V system is normal.
Check is completed
Power circuit is normal.
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
TROUBLESHOOTING