Schematic
Schematic of the Sharp ELSI-804 desk calculator of c. 1973: Hitachi HD3276 and HD3253, Toshiba TD2007 clock at 46.1 kHz, TM4356 driver arrays, nine Futaba DG10Q1 or NEC LD8051 tubes, -44 V and -49 V display rails, filaments in series.
9• FUTABA DG 10Q1 or NEC LD8051 14 8 10 8• 9• VACUUM FLOURESCENT DISPLAYS 16 30K 9 50K U3 Ø1 a U2 11 3 12 9 Toshiba Ø2 7 8 b U2 5 TD2007 4 14 1000p 2 680p 3 3 c U2 n.c.: 13 18 390p 6 820p 13 1,4,9,12 4 10 d U2 9.1K 7 9.1K HD3253 5 17 5 4 6 10 14 5 12 2 e U2 V–15 V–15 V–15 Ø1 SDO SDI 12 16 3 13 14 6 Ø2 DON ENB f U2 28 6 15 1 ØD ØD 8 1 27 g U2 50V 17 22K 11 13 1 22K V–15 h U2 7 20 a 15 V–15 f b V–15 g C 2 Sp U2 9 19 e c 7 CLEAR V–15 V–44 d p 56K V–15 Hitachi HD3276 9• 9• 30K 1 50K MSD ØD9 U1 250p 560K 18 20 15 2 KNUM ØD8 U1 19 19 1 2 3 4 5 6 7 8 9 3 ØD7 U1 20 18 250p 560K 4 16 ØD6 U1 KFCT 21 17 5 ØD5 U1 0 DP ÷ += –= CE 22 16 6 560K ØD4 U1 11 23 15 K 7 ØD3 U1 K 24 14 8 LSD ØD2 U1 25 13 8 9 DPP ERR ØD1 U1 26 12 2 1 V–15 V–49 10 V–15 V–7.5 U1::2 Toshiba TM4356 n.c.:11 250mA Notes ?V • Capacitance in microfarads unless otherwise specified. 100 33 • Digit scanning is LSD first (ØD1 occurs before ØD2). 50V VD 25V • Ø1 is 46.1 KHz, number cycle is Ø1/4/9=1.28KHz. POWER 250mA 15K ?V V–7.5 • Made in Japan. 20 19 18 17 16 15 14 13 12 11 VG 2SA473 V–15 100 • This drawing based on unit with Serial No. 3001464. 120VAC 50V 4W VN • 2000 Nov 17: Initial drawing / bhilpert. 4.7 V–44 2020 Feb: Format updates / bh. 100V TM4356 Vn Sharp ELSI-804 V–49 Calculator COM 130 display filaments Page: 1 of 1 Printed: 2020 Feb 6 1 2 3 4 5 6 7 8 9 10