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Thank you for your shop manual! Your help was very useful - the device is repaired! Once again - Thank you! I wish you a successful business! Edward (Russia).
;
It was a great experience,instead of purchasing a new Stereo Amplifier ,in just minutes i repaired my old one and that was thaks to the manual I have purchased from you.
Thanks again.
Samuel Alter
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Das ging ja sehr unkompliziert hat bestens geklappt und die Quallität ist auch noch gut.
Vielen Dank dafür.
;
Everything okay, thanks a lot. It was a pleasure for me to make a deal with you.
;
A deal without problems, very fast and the manual is a good quality. Sorry for the my english.
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.
12.0V 12.0V
Q6
5.0V 5.0V
Q3 Fuse
12.0V 12.0V 11.6V 0V 11.6V 12.0V
11.3V 12.0V
IC5
11.3V 12.0V 0V 0V
5.0V 5.0V
VP (+12 V) VDD2 (+5 V)
Q4
5.0V 5.0V 5.0V 0V
VDD1 (+5 V)
+
+ +
12.0V 12.0V 0V 0V 0V 0V 4.6V 4.6V
4.4V 5.0V
Q2
4.8V 0V
0.1V 5.0V
Q5
0V 0V
GND
VDD1
VCON DPW IC1 PON VDE TCON ON POFF
CPU
OFF
Power Switch Note : The voltages around transistors mean as follows; Upper figure : Power ON at no operation. Lower figure : Power OFF. Figure-8
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