Schematic
Ricomac 1216 Calculator: Reverse-Engineered Schematic
Schematic of the Ricomac 1216 of 1974: Hitachi HD3574 and HD3256, HD3233 and TM4352 driver arrays, Futaba DG10W1 tubes with an SP10D5M sign tube.
Schematic
Schematic of the Ricomac 1216 of 1974: Hitachi HD3574 and HD3256, HD3233 and TM4352 driver arrays, Futaba DG10W1 tubes with an SP10D5M sign tube.
Component Locations DS D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 U5 U6 U7 U8 U1 U2 U3 U4 CLOCK U9 150p DIGIT FILAMENTS N2 12 N2 POWER 0.3A bk 6V 1S1588 N2 2 5 7 8 2 5 7 8 9V 0.001 0.01 117 5V A628 2.2K 3.9K 33 0.01 3.9K 100K VAC 16V 0.01 5K VDD A509Y N2 U2,3,4 U5,6,8,9 V–9 HD3233P TM4352P wh 2.2K 330 35V 2.7K 100 0.1 25V N2 VGG A490 V–15 330 100 35V 50V VHH 33 N2 V–42 Notes • Capacitance in microfarads unless otherwise specified. • Based on unit with Serial No. 44218. • 1996 Aug 09: Initial drawing / bhilpert. 2020 Feb: Format updates / bh. RICOMAC 1216 Calculator Page: 1 of 2 Printed: 2020 Feb 5 10 8 10• 10• Digit 12 Digits 11 to 1 16 47K 6 100K Ø Sa U9 3 13 1 1 1 Sb U9 4 16 3 3 300p Sc U9 8 13 15 2.2K 400p 1 9 11 10 C372 U2 U2 U7 Sd 5 U8 16 10 12 Clock 27K HD3256P 5 47K 4 Module Se U8 2• 12 14 9 10K V–15 400p 1 3 4 6 9 21 31 32 36 42 Sf U8 220p 7 V–15 3 4 20 9 6 16 U2 U2 T15•Ø ØD 27 9 2 15 14 Sg U8 27K 2 7 10 6 A495 47K (serial data) SD 30 47K 14 6 V–15 V–15 V–15 V–15 ØD Sh U8 5 41 47K 11 13 15 26 Ø 25 V–15 3 St U8 39 100K 15 10K 2.2 4 Sp U9 6 19 40 47K 14 C945 U2 22 13 22K 47K 68K V–15 V–15 V–42 15K 1.5K V–15 13• 13• 12• 47K 470K 6 100K V–15 V–15 V–15 ØD15 U5 28 1 N1.5 13 U3 T15 16 4 ØD14 U5 N1-A 29 3 N1.4 14 T3 0 <–> CLR U3 T14 18 15 1 N1-E ØD13 U5 T4 1 7 6 N1.3 16 U3 T13 13 3 T5 2 % T3 ØD12 U5 8 4 N1.D 15 5/4 34 U1 U3 T12 T5 N1-J 14 11 T6 3 HD3574 ØD11 U5 12 + 14 33 9 N1.B U3 T11 T7 T6 N1-7 10 9 4 47K ØD10 U5 – 13 11 N1.C 10 T7 U3 T10 T8 5 V–15 12 6 MC ØD9 U6 17 12 1 N1.K 13 T9 6 ÷ T13 U4 T9 N1-F 16 4 F 47K T14 ØD8 U6 T10 7 = 11 3 N1.L 14 0 U4 T8 T4 V–15 15 1 3 T5 ØD7 U6 T11 8 M+ 2 37 10 6 N1.N 15 T6 U4 T7 3 N1-8 13 1 T12 9 M– T7 ØD6 U6 4 35 4 N1.M 16 T8 U4 T6 6 14 11 T13 DP MR T10 ØD5 U6 22 9 N1.R 12 U4 T5 T14 (–) 10 9 ØD4 U6 23 11 N1.P 10 15 U4 T4 12 N1-H ØD3 V–42 47K 24 11 N1.2 U2 T3 9 Each 12 U9 V–15 V–15 10 key matrix 16 100K intersection FLAGS V–15 11 N1-6 38 47K 470 10 U9 2 1 12 100K V–15 V–15 V–9 15K 12K V–15 A628A 56K 12K 68K RICOMAC 1216 27K A628A <M– Calculator 47K 68K Page: 2 of 2 Printed: 2020 Feb 5 V–15 V–42