Advertisement
-
M Z-5600A
(2) H t I terface LSis
os
n
r~
~5
~-
HOJ
Hr).;>
<D~
~
(~
llf]R
~
~~HA~}
(
DR.b
~
~R
...I,JD
~-
,.:K"_n
""""''""'
RMI
1~ j~.;>Kn•l
rxr
"I
r5re
r
~Ls
l
-a!:::
_8.
·~·
:RJ
[IC
~
~"-~
~
_,..,.,~<D®
..11.
NOC848
'~11
.naru
~
18
........ ""A\
-
_(J;
' ' : !:.
?Nti~
:Bz1t>
.IJ.
31_
JJ
'•IOSII"fi'O
~
_LC
_15
NC
JtJ
NC
lM:
_/8
M:
ADI!O
~ ~~
...Jii
::
..1
...,j,.,
~~
)1
~!...,
,,iiJii"l
)(i
~l
..L
~
.uf:..
p!)
lS&_
IS/
L.Y. • .,
·-;&:Q
.
.n
..-j~.:;
_TlliL
r-~~~
r-
~~
COW'MD
-~
!Si
'""' ___ ;:,;;(!5
r-,...,
01"1
--
"
~~
~~~
lf""'Y"
L!.
_.2.3
~;:i
~I!
rl
~
T'
l
!
~~'!
..21
~~
i
--.1
aK.-slNlr
..21
L: ..
:--.~
--
-·
~lr
IKA
fllr1
~~
UN"
~~
(3) Status 0 Read
D7
DO
l
STATUS
J
Ll
N SELF-OIAGNOSIS
:
1
DISK DRIVES 0
:
~10MB,
1:
>10MB
DIR INPUT
:
0
,
OUTPUT
:
1
'----I
DRQE
:
1
DRO
:
1
ERROR
:
1
I NTR
:
1
BUSY
:
1
Q)
Status 0 is abnormal though MPL Z-80 and the internal
circuits (NDC840- etc.) are operating and the
self-
diagnosis are normally completed.
•
NDC848 (4B)
is
bad.
•
The host interface circuiti are bad.
®
One byte of command is sent but the next DRO does
not rise.
a) If NDC840 (4E) Pin 1 is High,
•
NDC848 (4B) is bad.
b) If NDC840 (4B) Pin 1 is Low,
•
NDC840 (4E) is bad.
•
The IC peripheral of MPU Z-80 is bad.
®
A command was transferred but it does not start
oper-
ating.
a) If NDC840 (4E) Pin 1 stays High,
•
N DC840
is
bad
.
•
NDC848 (4B)
is
bad
.
•
The host interface circuitry is bad.
6-4-6. Read Mode
CD
The compelte IRQ does not rise
.
•
The host interface NDC848 (4B) is
bad.
-
14
-
129
lllmr
lJI
lfl1fnt
149
~-G>{j)
151
141
:~:
lsJ.
151
rg:
~
~
~~.-m
.~,
Q)
?~
pV.;>()
mmrQ>
•
NDC840 (4E) is bad (DMA).
®
lt started operating but it always gets an Error.
Reconfirm ltesm:
a) Recoefirm NDC847 (8G) Pin 2, 13-5V.
•
TL497 (8B)
is
bad
.
•
The peripheral circuits of TL497 are bad
.
b) Reconfirm NDC847 (5G) Pin 8 +5V ±2.0V.
•
EDC847 (8G) is bad.
c) Confirm Read Data from the disk.
•
NDC847 (7G)
is
bad.
•
NDC840 (4E) is bad.
•
NDC846 (4GT is bad.
•
74LS123 (8H) is bad.
@
lt started operating but it sometimes gets an Error.
a) Confirm NDC847 (8G) Pin 8 +5V ± 2.0V.
b) 74LS123 (8H) Pin 12:
•
Confirm Low level at 260ns±30ns.
6-4-7. Write Mode
CD
The complete I RO does not rise, though the command is
transferred
.
•
cd. 6-4-6CD
®
lt always gets an Error, though it started
operating.
a) In the case of an ID Error, refer to 6-4-6(2)
b) Data Write Error:
•
NDC842 (7G)
is
bad.
•
NDC840 (4E) is bad.
•
NDC846 (4G) is bad.
•
26LS31 (5F)
is
bad.
®
lt sometimes gets an Error, though it started operating.
a) In the case of an ID Error, refer to 6-4-6®
b) Data Write Error
:
•
cf.
6-4-7~
Advertisement
