Sharp MZ-5500 - Page 109

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16. Power supply unit
Two kinds of power supply units are used for the MZ-5500/S600 series which
differ in current capacity.
Model Circuit type
VCC(+SV) VDD(+12V)
VGG(-I2V)
Alarm signal
HZ-5511
MZ-552l
Transfonner +
secondary switching
type
9.2A
1.IA O.ISA Yes
MZ-56Jl
MZ-S641
MZ-S64S
Transformer +
secondary switching
type
IO.BA
3.9A
O.ISA
Yes
Power Secondary switching unit
transformer ~------~
CPu CN
AC inlet [~ - I------4
VC fan
(tll.V
o fv1FD CN 1 (- to MFD )
°Conneetor pin IDeation
CPU CN
MFD CNl, 2
Pin No.
Signal
name
Wire color
I +12V Yellow
2
GND Black
3
GND
Black
4
+SV
Yellow
' Pin No.
Signal
name
Wire color
1
-12V
•
Blue
2
+12V Yellow
3
+5V
Red
4
+SV Re&
5
ALARM
Orange
6
GND Black
7
GND
Black
9
GND Black
*The signal ground (SG) shares the line with the frame ground (FG).
°Alarm signal
Hoth types of the power supply units have the ' ALARM signal by which an
abnormal condition in , the DC output is detected as caused by a source
supply failure or quick on/off of the power switch or when the CPU rum wild
or subjected to abnormal action. With this / signal, immediate reset is
applied to the CPU. The signal is an open collector output and pulled up
to VCC level using a 2.2Kohms resistance. The ALARM signal is issued in
the following sequence: