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This service manual helped me to repair my PIONEER. Iam very satisfied, that I found it here.
Even the price of manual was not so high that person would not be able to spend a few money.
But that is very worth spent money. Thanks
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Excellent quality service manual. Quick processing, fair prices. Love to do business again. Thank you!!!
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Excellent service manual, the only known point of note is the alignment of improvability scanned pages within the pdf page. The resolution is good.
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I was very glad recieving the service manal from You. Additionaly very fast. Extremaly nice servicing. Thanks very mach! Now my GX-220 working better, than it was made. Alexander from Moscow, Russia/
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Sweet! I won the item on eBay and couldn't adjust the geometry or even keep a steady picure. This guide has the full schematics (not available anywhere else as far as I could tell), and was a bargain for the wealth of knowledge it contains. I hooked it up to my testing equipment, tweaked a few potentiometers and got it playing videogames in no time. Thanks!
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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