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g) SELF CHECK
1)
2)
3)
Press ~
+ @EN~.
(over 1sec.)
(Refer to Page 25)
Press m]
6-times.
Press ~.
SELF CHECK is carried
out in accordance
with the
following order.
1. GATE ARREY 1/0
*R/W
check of BUS lines of the port
2.
3.
4.
5.
6.
(Check the connection
of BUS lines to the GATE
ARREY)
MODEM Check
*Check the cycle of 9600 and 300BPS.
(Check OSC. of XTAL3 and connection
of the INT
for clock)
*Check DREQ cycle of 9600BPS.
(Check the switchover circuit relies on INT)
*Check
the receiving
signal
frequency
which
is
looped back of 11OOHZtransmitted.
(For checking analogue circuit of Tx and Rx)
MUSIP Check
*Check SH cycle
(Check the connection of INT4)
*Execute the scanning operation.
(Check the connection
of INTO)
RTC Check
*Check INT cycle.
(Check OSC. of XTAL3)
MR. Accelerator
check.
*Transfer certain data from RLEX to RAM.
(Check the connection of INT3)
TPH I/F Check
*Check the pulse width of strobe signal generated on
test purpose.
(Check the operation of STBON, STBINT and the
connection)
*Data Transfer (Check the connection
of INT2)
7. TAS Check
The following check is carried out
1) D-RAM Connection
Write a data to appropriate
address
of D-RAM
(each two address of internal and external of D-
RAM) then, read out these data.
2) Recording and playing.
Signals
(1100HZ,
OdBm), (1100HZ,
-15dBm),
(21 OOHZ, OdBm) and (2100HZ, -15dBm) out put
from MODEM is recorded by looping the circuit.
The
recorded
signals
are
checked
by
the
MODEM by playing them.
3) Analog Switch
The
signal
(1 KHZ,
OdBm)
is
output
from
TC88451
F and
is checked
by the
MODEM
by
looping
the circuit
and at the same
time,
analog
switches
equipped
with TC88451
F are checked
by switching
it in sequence.
—28—
INITIAL
SET
?
—
SELF
CHECK
?
SELF
CHECK
1
I
1
SELF
CHECK
2
I
SELF
CHECK
3
I
IS ELF
CHECK
51
4
IS ELF
CHECK
71
I
I
I
TEST
OK
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Table of Contents
Troubleshooting
