1-22 (No.YA700<Rev.001>)
SECTION 5
TROUBLESHOOTING
5.1
SELF CHECK FEATURE
5.1.1 OUTLINE
This unit comes with the "Self check" feature, which checks the
operational state of the circuit and displays/saves it during
failure.Diagnosis is performed when power is turned on, and
information input to the main microcomputer is monitored at all
time.Diagnosis is displayed in 2 ways via screen display and LED
flashes. Failure detection is based on input state of I
2
C bus and
the various control lines connected to the main microcomputer.
5.1.2 HOW TO ENTER THE SELF CHECK MODE
(1) Press
[INFORMATION(DISPLAY)]
key and
[MUTING]
key on the remote control unit simultaneously to enter the
SERVICE MODE.
(2) Press the
[2]
key SELF CHECK MODE.
5.1.3 HOW TO EXIT THE SELF CHECK MODE
To Save Failure History:
Turn off the power by unplugging the AC power cord plug when
in the Self check display mode.
To Clear (Reset) Failure History:
Turn off the power by pressing the
[POWER]
key on the remote
control unit when in the Self check display mode.
5.1.4 FAILURE HISTORY
Failure history can be counted up to 9 times for each item. When
the number exceeds 9, display will remain as 9. Failure history
will be stored in the memory unless it has been deleted.
5.1.5 POINTS TO NOTE WHEN USING THE SELF CHECK
FEATURE
In addition to circuit failures (abnormal operation), the following
cases may also be diagnosed as "Abnormal" and counted.
(1) Temporary defective transmissions across circuits due to
pulse interruptions.
(2) Misalignment in the on/off timing of power for I
2
C bus (Vcc)
when turning on/off the main power.
Therefore, turn on the main power, and then wait for about 3
seconds before starting Self check.
If recurrences are expected, ensure to clear (reset) the failure
history and record the new diagnosis results.
Fig.5-1
MAIN MENU SCREEN
SELF CHECK MODE SCREEN
Service Menu
Service Menu
1. Adjust
1. Adjust
2. Self Check
2. Self Check
3. I2C Bus Stop
3. I2C Bus Stop
POW PRO.
POW PRO.
2
INV PRO.
INV PRO.
1
1
I2C ANALOG
I2C ANALOG
0
0
I2C DIGITAL
I2C DIGITAL 0
HOURS
HOURS 0000002
0000002
LAST ERROR
LAST ERROR
1
1
0
Press [2] key
Refer to SECTION
1
Last power-off factor.
Failure history
