Casio KL-7000, Руководство по обслуживанию и список запасных частей

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CIRCUIT DESCRIPTION
Setting the batteries or AC adaptor (see figure 8)
When setting the batteries or AC adaptor, the voltage VDD2 is always applied to RAM and CPU since Q6 and
IC5 are turned on.
Power on sequence (see figure 8)
When the power switch is turned on, PON signal is being H (PON = VDD2). CPU knows to turn the power switch
on, it provides H from VCON terminal to base of transistor Q5. Then both transistors Q5 and Q4 are turned on,
the voltage VDD1 is applied to all devices.
Power off sequence (see figure 8)
When the power switch is turned off, POFF signal is being H(POFF= VDD2). CPU knows to turn the power
switch off, VCON signal and base of Q5 will be L. Then both transistors Q5 and Q4 are turned off, Q4 stops to
supply the voltage VDD1.
Power down sequence (see figure 8)
If the voltage across the batteries lowers and the terminal DPW of CPU comes less than 4.5V, VCON signal is
L. Then both transistors Q5 and Q4 are turned off, Q4 stops to provide the voltage VDD1.
Print sequence (see figure 8)
When the PRINT button is pressed, TCON signal is H. Then both transistors Q2 and Q3 are turned on, the
voltage VP for printing will be 12V.
Figure-8
VCON
+
+
+
Q2
Q3
Q6
IC5
Q4
Q5
TCON
DPW
VDD2 (+5 V)
VDD1 (+5 V)
GND
VP (+12 V)
CPU
PON
POFF
ON
OFF
VDD1
IC1
VDE
Power Switch
Fuse
12.0V
12.0V
5.0V
5.0V
11.3V
12.0V
11.3V
12.0V
0V
0V
5.0V
5.0V
12.0V
12.0V 11.6V
0V
11.6V
12.0V
12.0V
12.0V
0V
0V
0V
0V
5.0V
5.0V
5.0V
0V
4.4V
5.0V
0.1V
5.0V
0V
0V
4.8V
0V
4.6V
4.6V
Note : The voltages around transistors mean as follows;
Upper figure : Power ON at no operation.
Lower figure : Power OFF.