Service manual

3-10
3) SYSTEM PART
No
Yes
No
Yes
No
Yes
Yes
No
Yes
Yes
No
When the screen is not
displayed after the power
is turned on
Check with the terminal after
connecting the test cable to
the port for a service
Test each section at Debug mode.
Operating
normally at the
terminal
Check
2.5V output at 3-pin
of CPU power IC155
Check
whether the clock of
33.33MHz is generated at 7-pin
of IC102(Clock
Generator)
J101(DIP Switch)
Check Setting
Check whether
4-pin of IC103(Reset Driver)
is high
Check the terminal message
by using Password
“debugLST2400”
Check whether 3.3V is
supplied at Power
Connector 8,9,10-Pin
Check whether X-Tal
(X100) is oscillated
14.318MHz
Check whether System
S/W is downloaded
Check whether 3-pin of
IC101(Reset IC) is low
Check whether IC104,
IC138(CPLD) is
programmed