Schematic
Facit 1114 Calculator: Reverse-Engineered Schematic
Schematic of the Facit 1114 of 1973: Hitachi HD3276 and HD3253, Toshiba TM4352 drivers, Futaba DG10T tubes.
Schematic
Schematic of the Facit 1114 of 1973: Hitachi HD3276 and HD3253, Toshiba TM4352 drivers, Futaba DG10T tubes.
9• FUTABA DG 10T (3BD) 3.9K 47K 60K 3.9K 8 10 9• 9• VACUUM FLOURESCENT DISPLAYS 2K 16 50K 9 50K Ø1 a U3 390p 470p 3 10 5K 9 Ø2 11 C458 b U3 4 12 330p 2.2K 6 C458 C458 c U3 V–15 V–15 U7 13 13 HD3253 9 d U2 5 10 2K 4 6 10 14 4 12 2 e U3 Ø1 SD SD 12 14 3 5K 13 14 11 C458 Ø2 ØD ØD f U2 28 6 12 1 470p 2.2K 3 27 g U2 0.1 17 22K 11 15 V–15 V–15 6 100K V–15 h U3 7 13 a 15 V–15 f b V–15 g C NK6 1 Sp U3 0.1 9 16 e c 7 NK24 V–15 V–33 d p 100K NK22 V–15 V–15 9• 9• 100p Hitachi 50K 1 50K HD3276 U1 560K 18 16 NK1 15 3 NK11 U1 19 15 1 2 3 4 5 6 7 8 9 4 U1 20 14 100p 560K 6 16 U1 21 13 NK12 11 U1 0 DP ÷ += –= CE 22 12 9 560K U1 11 23 10 NK9 1 U2 K 24 16 3 U2 F 25 15 4 8 4 U2 2 NK23 26 14 2 5 1 V–15 2 V–47 NK19 NK20 NK21 NK18 NK17 NK16 NK15 NK14 NK13 V–15 V–9 5 U1::3 7 Toshiba 8 TM4352 1K 330 22 0.047 VD Notes 25V 25V 2.2 092 V–9 50V ?V • Capacitance in microfarads unless otherwise specified. POWER ? VG • Some aspects of the power supply design presumed, voltages obtained V–15 from clock built with transformer from examined unit. 330 120VAC • Made in Japan. 16 15 14 13 12 11 10 9 3W 33 100V • This drawing based on unit with Serial No. 1415950. VN • 2000 May 08: Initial drawing / bhilpert. V–33 330 2020 Feb: Format updates / bh. TM4352 display filaments 10 Facit 1114J 33 Calculator COM COM COMCOM 50V VN’ Page: 1 of 1 Printed: 2020 Feb 7 1 2 3 4 5 6 7 8 V–47