-
MZ-IF16
SHARP
SERVICE
MANUAL
CODE:OOZMZIF16//-E
MINI FLOPPY DISK DRIVE UNIT
MODEL
INDEX
MZ-1F16
THIS SERVICE
MANUAL
MUST
BE
USE
WITH FD55(
L)
SE
R-
VICE
MANUAL
1. SPECIFICATION _
.................................
_
............
2
2.
SYSTEM BLOCK
DIAGRAM
....................................
3
3.
POWER
SUPPLY BLOCK
DIAGRAM
.............................
4
4.
TROUBLE
SHOOTING PROCEDURE
OF
POWER SUPPLY
......
"
..
, 5
5.
POWER SUPPLY CIRCUIT
DIAGRAM
............................
7
6.
SIGNAL
POSITION
OF
CONNECTOR
.............................
9
7.
STRAP
......................................................
10
8.
PARTS POSITION
..........
-
...... , .......
"
.........
_
......
10
PARTS GUIDE PARTS LIST
SHARP CORPORATION
1.
Specification
Outline
The
MZ-1
F16
is
an
external expansion mini-floppy disk unit designed for
use
with
the
MZ-5600 Series Business Computer_
It
consists
of
a pair
of
thin type mini-floppy disk drives. The unit should be used for
the
third and fourth drive units of the
MZ-5600 Series Business Computer.
Specification
________
~M=odrun~~e
____
----~~~1U6L.--~------
__
----
______
-------------------------------
Recording capacity 640KB x 2
Tracks
80 tracks
Sectors
16
sectors x 2
Recording medium 5-1/4" disk
Power supply Local Voltage
50/60Hz
Power consumption 50W
Operating temperature 10°C to 35°C
Operating humidity 20%
to
80%RH, w/o moisture condensation
Physical dimensions 118
(W)
x 331
(D)
x 189
(H)
mm
Weight 6.0
kg
Accessories
Instruction book, drive number label, power cord.
Connection procedure
(1)
In
the
first place, make sure
that
all
powers are off
to
MZ-5600 and peripheral units.
(2) Interface
the
MZ-1
F16 with
the
MZ-5600 using
the
MZ-1
C43
Mini-floppy
Disk
Interfacing Cable option. The cable end at
the
MZ-1
F16 side must
be
connected
to
the
connector located on the upper part
of
the rear panel.
(3) After connection
of
the cable, secure connectors tightly
at
both sides
of
connectors
using
screws.
~
I
'"
I
/
HEAD
LOAD
)'
r-r---------------------------------,
2
SELJ
n
DRIVE
ICI
;
INDEX
~
SHORT
PIN lOSOI
5
SELO
4 Z
7
SELl
r-
34 3 m
9
SEl2
~
WITHOUT
TERMINATOR
11
MOTOR
ON
0
13
DIRECTION
::t:J
15 STEP
L-
17
WROATA
r-
'9~~
~
~
L
23 NR PRO
25
RD
DATA
26
SIDE ONE DUST-1357ACZZ
24
READY
r
....
;---
- -
-1
14Pin
I : le SOCKET
:
9?9995'9
:
l ~
TERMINATOR
330n x 7
r
DRIVE
lOJ
OAr~P-s~.....
8
SHQRTPINlOS11
~
Y :
~
2
B\;;-"
I
~
pj
WITHOUT
TERMINATOR
I v I - ~
1
AI
I 0
Y , ~
d,""
B~
"':::-.:
~
IMZ
1 F16 drive CO)
r-----c
+5V
; DUNT-1357ACZZ
120n
GND
GNO
+5V
2
~igPG2
IGreenl
4
POWER SUPPLY
UNIT
I
4
IN
PUT
N
.
en
1
CD
3
ID
0'
o
'"
C
~.
..
III
3
~I
-
CO
3.
Power
supply
Block
DIAGRAM
3-1.
Block
diagram
1 :
sw
T1
, ,
i~
;:
1---1~------<:J
+12V supply
.~
o
>-+-+-----1
,z
f---i-t--:----'O
'i-5V
supply
T2
(Fig.
1)
3-2.
Shown
in Fig. 1
is
the
block diagram
of
the
power supply
circuit.
Souce
power
is
first eliminated
of
noise through
the
noise filter, rectified, and
it
then
charges
the
capacitor
of
the
filter. When this
DC
voltage
is
impressed
to
the
power switching circuit,
it
starts
to
oscillate
so
as'
to
convert
the
DC
voltage into a high frequency AC (20KHz
or
more) power, which
is
rectified
through
the
high
frequency
ferrite
transformer
(H)
to
produce
+5V and
+12V supplies. Both
outputs
are stabilized by means
of
the
controller. As each
of
outputs
is
supplied
to
the
controller,
control
signal
is
fed back
to
the
primairy side
by
the
means
of
the
saturable
reactor (T2). This control
signal changes
the
oscillation
fiequency
by controlling
the
switching
transistor
drive
current
so as
to
stabilize
outputs.
4.
Trouble shooting procedure of POWER SUPPLY
4-1.
Tools required
The following tools
are
required for
servicing.
4.
5V
11.3A and 12V 11.3A loads
1. Oscilloscope
5.
AC ammeter and
voltmeter
2.
Voltage regulator (Slidac)
3. Voltmeter (digital voltmeter)
4-2.
When R 1
is
open
Since this failure may possibly be due
to
short circuit
of
ac
line capacitor, RC1, C4, or Q1,
the
cause
has
to
be checked
in
accordance with the flowchart below. -
Flowchart
Phenomenon
and
others
Replacing
component
Gl
Set
the
oscilloscope
to
the
follow·
(
Start
ing
range.
Voltage range: 50V/div
~
Time range:
10us/div
Replace
R 1 with the new
one.
®
Shut off
the
AC
supply immedi-
Replace
the
following components
l
Gl
ately, when
the
ammeter coupled with new ones
in
this case, because
Connect the oscilloscope
to
the
AC
line increases abruptly. there may be possible destruction
in
probes
between
the
emit~
these components.
ter and collector
of
Q1.
01,
RC1.C4.Cl,C16
~
®
@
Should
01
be found
in
failure,
there will
be
need
of
replacing
Gradually increase the
the
following components, as
they
AC
voltage using *Slidac.
may possibly be
in
destruction,
too.
~
@
02,03,Dl,D3,Rl1,RS
Replace
the
defective
@
component with
the
new
Put
the
load into connection
in
NOTE:
Should 01
be found
in
fail~
this case and ensure
that
the
ure, there may be possible destruction
one.
following waveform appears.
in
RS,
too.
When
Step
(2)
is
carried
~
@
out
with
RS
in
open state,
it
causes
Gradually
increase the
r-
to
add
dc
voltage between
the
collec-
AC
voltage using *Slidac
h
tor
and
the
emitter
of
01 so
that
DC
and
ensure appearance
of
voltage may not decrease even after
the waveform shown
in
the
ac supply
was
shut
off.
So,
care
FIG·2.
320V
must be exercised
in
this
case
to
~
avoid continuous impression
of
the
DC
Check
proper output
of
voltage.
+5V and
+12V, respec-
tively.
-~
-
J,
1--35"S-
(
End
)
(Fig.
2)
* Slidac = Variable Voltage transformer
-5-
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