1 SW4 tack switch 2 SW3 1 2 SW2 tack switch 1 4 tack switch 2 SW1 1 D tack switch 5 3 2 1 1K R1 D 1 2 D1 CN4 OF OUTPUT BOARD 1 2 3 4 5 LED CN3 IN CONTROL PCB C C B B NO DESCRIPTION APP CHK DATE AMEND DATE :- 26/09/2K7 A SCHEMATIC CIRCUIT DIAGRAM OF KEYBOARD PCB 5 4 3 2 1 A
5 4 3 R5 68E/3W MOR 2 1 C16 1nF/100V DIP HV+ SHUNT MBR30H100 1 2 + 10K R10-R15 2200uF/25V R29 C28 C31 4K7x6 C30 0.15/5W/WW R16 0.
5 4 3 2 1 +V +VDDIO R17 2K2 R26 470E R30 6K8 R18 Q5 1 U5A PC817 5K6 D BC856 TX 5 Q8 R25 BC846 D 1K CN14 U5B PC817 1 2 3 R19 4 2 +V 3PinSTM 4K7 R13 BC846 -V +VDDIO 5K6 Q3 1 +V D5 C R23 2K2 R21 PC817 Q4 470E 2Pin STM D6 Q6 D7 R24 2 3K3 B 2 BC856 2 3 BC846 10E D 4148W PC817 R27 U7A 1 1 U7B Q9 1 2 R15 4 1K RX CN13 10E R20 1K C D 4148W 2 Q7 BC856 R28 4K7 R16 R14 R22 5K6 1 B D 4148W BC846 -V 4K7 NO DESCRIPTION APP DATE CHK AMEND .
4 3 2 1 D D ROTARY ENCODER . . 1 2 . 3 C C 10K .
4 + VSense LM324 - 470nF C8 9 8 7 6 5 4 3 2 1 RX 220E 470nF C12 TX 33nF C13 11 33E 1206 R7 J6 AVDD VDDI0 61 54 53 52 51 50 49 48 47 46 TMS 15 TDI XCLK1 45 P0.1 P2.3 XCLK0 44 P0.7 P2.0 43 42 IRQ1/P0.5 41 J10 1 2 C1 CN1 D RST P3.4 P3.5 IRQ0/P0.4 VDD10 R5 1k U3 J6 C7 9 8 7 6 5 4 3 2 1 Q10 BC 846 4K7 R11 C3 TL431 4K7 R12 R8 2R2 C4 10uF\35V 330E R6 C 5K6 R29 T.S CN9 VDDI0 1 2 100nF CN11 C5 U2 1 32.
5 4 3 2 1 +12V C62 100n 100K D D NC Is 16 8 11 12 C53 33n C55 5 15 1nF C52 33nF R52 R53 R50 5K6 4K7 100E 10uF/35V R56 6 12K 2K7 R51 C63 1 2 3 U4 13 10K 100nF TL494 14 CN3 R46 C47 C49 100pF R47 R48 R49 330E 1K 100E 2 R54 4 C50 100nF C48 33nF 1 Vs 10n B 220E +12V 10 C54 7 18K 9 B C 3 10uF/35V C C51 +12V R55 C59 C58 220nF/100V POLY BC547A BC547A 100n Q6 Q7 100n 220nF/100V POLY 5 2 1 R57 4 R58 Q8 1 C56 2 3 DESCRIPTION TX6A CHK D
5 4 3 2 1 U9 HV+ 1 D D18 UF5408 P6KE180 C77 OUT 2 C73 + C61 C78 3 + D19 IN GND LM7812 D22 100nF 1206 D UF4003 100uF/25V HV- 100n 1206 - D23 ~ _ 12V 470uF/25V + UF4003 D17 1N4007 C74 R86 3K3 1206 5 470uF/25V 6 7 U7 4 C FB2 D21 + 8 UF 5408 FSDL0365 D20 C UF4003 C72 C75 470uF/25V 100uF/25V 15n 1206 3 2 C81 1 R81 7.
