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Troubleshooting
-
(The system doesn't start.)
4
i
te
ves
Replace the tuse,
(Be caretul
to an
Timing clock 7777777797
overcument)
Yi
No
i s m
IT
cs
Ea Ea
'Check X2ASKC,
and +55V0C line
OutMt term
es
yma
Yes
"Se
'is LOO OC cx
supplied ?
mm
i
I
Ne
1
No
Check
i
soldering of CPU,
|
Does BAT
ROM and RAM,
|
FAULT occur ?
|
Bene
eee
Ue
|
|
Does vor
yes
FAULT occur ?
VCC FAULT:
When the VOUT is 4.5V or less, "L* is outputted
from 3 pin (VDOUT) of the IC21. To prevent the
IC21 3 pin from outputting "L* forcibly, float the IC21
3 pin.
BAT FAULT:
When the battery voltage falls below 3V, "L* is out-
putted.
Note: This circuit operation is based on the third trial model.
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