Hitachi RAM-71QH5 Service Manual page 64

INSPECTING OUTDOOR ELECTRICAL PARTS
Check to see that the LED is either on or blinking.
Carry out inspections by examining the on/blinking status of LEDs 301-304.
LED number LD301 LD302
Name Diagnosis Diagnosis
lamp 1 lamp 2
Case 1 Off Off
Off
Case 2 Blinks once
Blinks Off
Case 3
On Blinks
Case 4
Off Off
Case 5
(blinks once)
Case 6 Off
Case 7
On
Case 8 Off
On
Case 9
All manuals and user guides at all-guides.com
LD303 LD304
Communications Operation
lamp lamp
Off Off
Off Off
Off Off
Off Off
Off Blinks
Off On Off
On Off
Off
On On Off
On On Off
– 73 –
Status
Normal off status or If the LED is not on even when the
unconnected power source is connected the
microcomputer power microcomputer power source is
source unconnected.
Inspection method 1
Microcomputer reset
If is normal for LD301 to blink once
status (immediately
after the power source has been
after inserting power
inserted. If the unit stops when it is in
source or immediately
operation and LD301 blinks once, it is
after power source
possible that the power source has
abnormally)
been temporarily
lightning or for some other reason.
Replace the control PCB if this occurs
frequently.
Abnormally stop is shown by the
Abnormally stop
number of times the LED blinks.
Inspection method 2
Thermistor abnormally
Thermistor abnormally is shown by
the number of times the LED blinks.
Inspection method 3
Communications error Communications error is shown
by the number of times the LED
blinks.
Inspection method 4
*In the case that an internal unit is
not connected, the number of
connected internal units is
shown by the number of times
the LED blinks. This is not a
abnormally.
has no communications error
and is able to operate normally.
Normal operation Normal operation
OVL1 operation Normal operation
OVL2 operation Normal operation
OVL3 operation Normal operation
Checkpoints
interrupted by
The internal unit