FLOW CHART NO.5
TlMER
(1)
TROUBLESHOOTING
FLOW CHART NO.6 TIMER
(2)
TROUBLESHOOTTNG
The fluorescent display tube fails light up.
Key-in input is not received.
I
Is the supply voltage of
5V
fed to
No
pin (18)of
IC5001?
Check
ATSV
line.
G
Is the supply negative voltage of
-25V fed to pin (16) of
ICSOOI?
I
YES
ND
Check negative voltage
(AT-25V)
line and power circuit.
Check FL5001 and
lC5001.
1
YES
I
+
I
Is filament voltage applied
between
(l)/(2)
and (53)/(54) of
the fluorescent display tube?
Also negative voltage applied
between these pins and GND.
NO
Check power circuit and
peripheral circuit of 09907.
Does the fluorescent display tube
function?
YES
No
Check for cracks on the fluorescent
display tube.
I
Replace
IC5001.
I
contact?
Check switch contact.
key inputs?
YE5
Check all the terminals of
IC5001
and switches for poor soldering.
Are pulses received at pins (26) ND
thru (29) of It5001 when the keys
Check lines of key in and scan out.
are activated?
YE5
Check IC5001,
RI701
and
FIP
data,
FIP
clock,
FIP
CS
and key data.
FLOW CHART NO.7 INFRARED R/C
TROUBLESHOOTTNG
No operation is possible from the infrared remote control.
Check ATSV and GND lines.
the receiver when the infrared
Replace receiver.
remote control is activated?
’
IYES
Check between at pin
(3)
of
receiverthrupin(14)of
IC701.
Replace
IC701.
J
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