Inspecting Outdoor Electrical Parts - Hitachi RAM-55QH5 Service Manual

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
Name Diagnosis
lamp 1
Case 1 Off
Case 2 Blinks once
Blinks
Case 3
On
Case 4
Off
Case 5
(blinks once)
Case 6 Off
Case 7
On
Case 8 Off
On
Case 9
LD302 LD303
Diagnosis Communications
lamp 2 lamp
Off Off
Off Off
Off Off
Blinks Off
Off Blinks
Off On
On
Off
On On
On
On
LD304 Status
Operation
lamp
Normal off status or
Off
unconnected
microcomputer power
source
Microcomputer reset
Off
status (immediately
after inserting power
source or immediately
after power source
abnormally)
Off
Abnormally stop
Thermistor abnormally
Off
Off (blinks)
Communications error
Off Normal operation
Off OVL1 operation
Off OVL2 operation
Off OVL3 operation
‚ O E E E E E‚ `
– 95 –
Checkpoints
If the LED is not on even when the
power source is connected the
microcomputer power source is
unconnected.
Inspection method 1
If is normal for LD301 to blink once
after the power source has been
inserted. If the unit stops when it is in
operation and LD301 blinks once, it is
possible that the power source has
been temporarily interrupted
lightening or for some other reason.
Replace the control PCB if this occurs
frequently.
Abnormally stop is shown by the
number of times the LED blinks.
Inspection method 2
Thermistor abnormally is shown by
the number of times the LED blinks.
Inspection method 3
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. The internal unit
has no communications error
and is able to operate normally.
Normal operation
Normal operation
Normal operation
Normal operation
by