6-18
6-18 E
3. TROUBLESHOOTING
3-1. Test Mode is not activated
With the set assembled in the front panel, the Test mode does not
become active if any button was pressed by any reason.Under this
condition, the power is not turned on even in the normal status.
(The set is kept in Standby status = Red LED is kept on) Not only
the buttons are inactive, but also a signal from remote commander
is not accepted. To check this condition, with the self check port
(pin
ws
of IF CON) kept in “Low” status, supply the AC power, so
that the Test mode is forcibly activated. On the board, short the
lands where SELF is printed. The IF CON checks the self check
port only after the power on reset (only when AC is supplied; not
in Standby status). If any button was pressed, the button name
should be displayed on the FL display tube. Though no button is
pressed this time, display of other than NOTHING implies that
the button was pressed.
3-2. Power is not turned on
1
Red (STANDBY) LED does not light up when AC was sup-
plied. The power (EVER 3.3 V) is not supplied.
X201 is oscillating.
2
Red (STANDBY) LED is kept on though POWER button was
pressed. Any button is kept pressed.
PONCHK (IF CON pin
uj
) is over 0.1 V.
3
Green LED lights up when POWER button was pressed, but
red LED lights up again after several seconds. PONCHK (IF
CON pin
uj
) is abnormal. (Slow rise time from 0.1 V to 1.5 V.
Voltage must be less than 1.5 V)
SYSTEM CONTROL does not operate normally.
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