RAM backup voltage main voltage regulator R C D C R VR Q6 R5 R -.5V R Q Q5 R6 Q R7 R8 C LCD boost converter C C5 C6 Q8 R9 Q9 D D5 R0 R Q R LCD voltage regulator D9 C7 D8 D7 C8 VR D6 Q LCD contrast Q6 R R5 R6 VR VLC 9 R7-0V R Q5 -.5V VLC 0 Q R8 6 5 R9 Q7 C9 R0 C0 R IC0 5 0 6 5 9 8 supply voltage monitor R5 C Q0 Q VR IC0 R R R C C IC/77 IC/77 power switch 6 RAM supply voltage VD IC0 7 7 7 8 R6
/ R7 Ø Ø IC D KM K K K0 K9 K8 K7 K6 K5 K K K K SW OSI OSO R8 / R9 Ø Ø IC D KM K K K0 K9 K8 K7 K6 K5 K K K K SW OSI OSO R0 bus bus 5 6 7 8 9 0 5 6 C C5 R Q R7 Q 5 6 7 9 0 R R R R6 R8 IC0 IC0 R5 IC0 R9 IC0 R0 expansion port 5 9 7 5 9 8 0 0 8 6 R R R R R5 R6 R7 bus 7 D FAULT BUSY VM Ø INIT Ø MTCS FG PL 0 5 6 8 9 C6 C7 C8 C9
VD Ø Ø D DC V V V V R/W BL BL BL BL VD Ø Ø D DC V V V V R/W BL BL BL BL VD Ø Ø D DC V V V V R/W BL BL BL BL VD Ø Ø D DC V V V V R/W BL BL BL BL IC IC IC5 IC9 V Ø V VD Ø D V Ø V VD Ø D V Ø V VD Ø D X X X VD Ø Ø D Ø VD Ø D R8 R9 R50 R5 R5 R5 R5 R55 R56 R57 C0 C bus
keyboard matrix " E D C W S X Q A Z = ) T G B ( R F V : U J M, Y H N ENTER. 0 P O L I K / * - 9 6 8 5 7 to the LCD board DEL 5 6 7 8 9 0 ANS CLS R7 CAPS SPC on BRK SHIFT off R58 R59 R60 R6 R6 R6 R6 R65 R66 R67 R68 R69 R70 R7 R7 5 6 7 8 9 0 5 6 7 8 9 0 5 6 7 8 9 0 buzzer K K K K0 K9 K8 K7 K6 K5 K K K K power switch LCD_on VLC VLC LCD_ Ø Ø D FG to the CPU board
C0 C0 C0 C0 C05 C06 C07 C08 C09 C0 C C C C C5 C6 C7 C8 C9 C0 C C C C C5 C6 C7 C8 C9 C0 C C C C C5 C6 C7 C8 C9 C0 C C C C C5 C6 C7 C8 C9 C50 C5 C5 C5 C5 C55 C56 C57 C58 C59 C60 C6 C6 C6 C6 C65 C66 C67 C68 C69 C70 C7 C7 C7 C7 C75 C76 C77 C78 C79 C80 VCC V V V V V5 VREF DO DF CP CP V5 V V Ø Ø D 0 9 8 7 6 5 FG LCD_on VLC VLC LCD_ Ø Ø D serial data display frequency, frame alternating signal bi-phase clock signal bi-phase clock signal DI DF CP CP R0 R0 R0 R0 R05 R06 R07 R08 R09 R0 R R R R R5 R6 R8 R7 R9 R0 R R R R R5 R6 R7 R8 R9 R0 R R R0 R0 R0 R0 R05 R06 R07 R08 R09 R0 R R R R R5 R6 R7 R8 R9 R0 R R R R R5 R6 R7 R8 R9 R0 R R right side left side IC IC column driver row driver V5 V V IC Q7 R7 R75 R76 90kHz R77 R78 R79 C C C C5 C6 C7 C8 C9
IC IC IC IC IC5 Q Q Q Q Q5 Q6 Q7 Q8 Q9 D VR VR VR VR R R R R R5 R6 R7 R8 R9 R0 R R R6 R7 R8 R R6 C C C5 C8 C9 C0 C C R7 R8 R9 R0 R R R R R7 R8 R C7 C8 R8 R9 R50 R5 R5 R5 R5 R55 R56 R57 C0 C
IC9 Q5 Q6 R7 R6 D C D9 D8 Q R5 D7 R R C6 C5 IC0 Q Q D5 R9 R5 R0 C C7 D6 R9 R6 R0 R Q0 Q R C R R5 5 0 5 0 5 0 C buzzer K K K K0 K9 K8 K7 K6 K5 K K K K power switch LCD_on VLC VLC LCD_ Ø Ø D D FG R R R R5 C9 C6 X X X
Parts list IC HD697A06 IC HD697A07 IC HD69C IC HD69C IC5 HD69C TC07BF TC0H000F TC07BF IC9 HD69C IC0 TC50H000F IC M65 IC M66-0K IC LA50 Q SC6 Q SA8 Q SA8 Q SC6 Q5 SA8 Q6 SC6 Q7 SA8 Q8 SA8 Q9 SA8 Q0 SA8 Q SA8 Q SA8 Q SA8 Q SA8 Q5 SA8 Q6 SA8 Q7 SC6 red LED S588 D S588 D Zener 0V D5 D6 S588 D7 S588 D8 S588 D9 S588 VR 0kΩ VR 50kΩ VR 0kΩ VR 00kΩ R 00Ω R.MΩ R 0kΩ R 50kΩ R5 50kΩ R6 68kΩ R7 7kΩ R8 70kΩ R9 kω R0 kω R 5kΩ R 5kΩ R R 0kΩ R5 70kΩ R6 70kΩ R7 80kΩ R8 0kΩ R9 0kΩ R0 70kΩ R R 0kΩ R 0kΩ R 70kΩ R5 9kΩ R6 R7 R8 56kΩ R9 R0 56kΩ R 5kΩ R 5kΩ R R R5 0kΩ R6 kω R7 R8 R9 0kΩ R0 kω R.9kΩ R.9kΩ R.9kΩ R.9kΩ R5.9kΩ R6.9kΩ R7.9kΩ R8.kΩ R9.kΩ R50.kΩ R5.kΩ R5.kΩ R5.kΩ R5.kΩ R55.kΩ R56.kΩ R57.kΩ R58 00Ω R59 00Ω R60.7kΩ R6.7kΩ R6.7kΩ R6.7kΩ R6.7kΩ R65.7kΩ R66.7kΩ R67.7kΩ R68.7kΩ R69.7kΩ R70.7kΩ R7.7kΩ R7.7kΩ R7 50kΩ R7 R75 R76.MΩ R77 00Ω R78 00kΩ R79 7kΩ C 0.μF C μf C μf C C5 C6.μF C7 μf C8 C9 C0 C C C C C5 C6 C7 C8 C9 C0 C C C C C5 C6 C7 C8 C9