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Step 3. CPU <+
lC's Communication (Bus Line ) test [SelÍ Diagnostic (Factory/Service Mode)]
In Service mode, the CPU checks Íor circuit integrity and
displays the test results on the LCD. Use this mode Íor
quick Íault isolation'
. Digitat Error Rate Display
How To Enter Service Mode
1. Set to "Factory mode".
2. With the LCD shown "FACTORY 024D, press the
"TEXT" button, and "SERVICE MODE" will appear on
the LCD.
LCD -+
tr s E R V tc E IM oD E fl
Note: Pressing the "TEXT" button again, returns the mode
to the FACTORY MODE.
o LSl, DRP SFC and DAIO Communication
Test
The CPU is connected to its peripheral lOs (DRP, SFC
it is necessary to determines which lC out of DRP, SFC
and DAIO) via a parallel bus consisting oÍ clock, data,
and DAIO (including their peripheralcomponents)
is
and control lines. lÍ an "NG" message is displayed on
defective. The Ílowcharts on the following pages provide a
the LCD as a result oÍ self diagnostics in Service mode,
quick troubleshooting guide to locate the defective lO(s).
- 2s -
PCs 79 z*s
COUNTER
button
operation
count
Test item
LCD message
Remarks
1
(LCD) test
(All LCD's light up.)
2
L3 BUS communi-
cation test
L3 BUS OK or
L3 BUS NG
See commu-
nication Test
on pages
25-27.
3
DRP communica-
tion test
D RP OK or D R P N G
4
SFC communica-
tion test
SFC OK or SFC NG
5
DAIO communica-
tion test
DAIO OK or DAIO NG
6
Total error rate
Displays number of
errors generated in 32
segments (for 1.3 sec.)
in hexa decimal.
See Digital
Error Rate
Display.
0-
n
rdi
nd
00
Inc
licat
0(
ndi
0-
45 67
ch
J + J +
0 0 0 0
tes main d
AUX data
YS INFO d
RRECTIO
LIABLE data
. Meaning of data error codes
0-00 0 -0000000 0
0-00 0 -0010100 0
EX:
OK
0-00 1 -000000 0 0
t-
(AUX data error)
0-01 0 -000000 0 0
+
I-(SYS INFO data error)
0 -00 0-01 101 000
1-1 11- 111 1111 1
9 -99 9-99 999 999
A -A A A -A A A A A AA A
F -F FF -F FF F FF F F
Main data error
lf the data error code is "NG", check test
Step 4. O-Oon
page 28.
0
+
0
nl
' Ind
ndici
licatt
esU
)rror.
L data
oaïa e
, grror.
Jata
N FAI]
lata
errc
ata
,l Fl
lrca
9S r
; S \
)oF
ELI
| 2 3
J +
)00
Indi<
cater
rtes {
's C(
NRE
0 1
.t +
c0
l-
I
l- lr
rdic
icatr
rtes
U N
EX:
NG
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