Toshiba ST 910 Service Manual
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Extracted text from Toshiba ST 910 Service Manual (Ocr-read)
Page 2
5" P
9955»
10.
11.
12.
TABLE OF CONTENTS.
Page
OPERATING CONTROLS 8| EXTERNAL APPEARANCE
1-1. Front View . 3~4
1-2. Rear View 5~6
PARTS LOCATION
2-1. Chassis Top View ..................................................................................... 7
DISASSEMBLY INSTRUCTION
3-1. Cabinet Removal . 7
3-2. Front Panel Removal ..
SEMICONDUCTOR BASE DIAGRAM ........................................................... I .. 8
BLOCK DIAGRAM ............. . ............................. L ...................................... 9 ~10
INSIDE CONNECTION OF IC and TRUTH TABLE ............................ 11 ~ 18
PRINCIPLE OF DIGITAL CIRCUIT ................................
SCHEMATIC AND MOUNTING DIAGRAM
8-1. Schematic Diagram I
8-2. Schematic Diagram 11 25~ 26
83. Power Supply Unit . 27 ~ 28
8-4. Front End Unit . 29~30
85. IF Unit .......... 31 ~34
8-6. Multiplex Unit 35 ~36
CIRCUIT ADJUSTMENTS
9-1. RF Adjustment
9-2. Distortion and Separation Adjustment
TROUBLE SHOOTING CHART .............................................................
PARTS LIST
CABINET EXPLODED VIEW ................................................................. 45~46
Page 10
51-910 . 51-910
TRUTH TABLE TD-3447AP V TD3502AP
Vcc A7 42-A3 A4 Y STHOBE
LOGIC DIAGRAM
A4 A3A2 32 5354
FUNCTION
D c B 31/1130 12 c a f g 14 13 12 11 m 9 8
o o o o 1 o o o o o 1 1
1 o o o 1 o o 1 1 1 1
2 o 0 1 1 o 1 0 c1 1 o
3 o o 1 1 o o o 1 1 o 1 2 3 4 5 6 7
4 o 1 o 1 o u 1 1 o o 34 B3 32 57 NC x GNQ
5 u 1 o 1 1 o o 1 o o
6 0 1 1 1 1 0 D 0 0 0 TRUTH TABLE TD3502AP
7 ° 1 1 1 0 0 1 1 1 1 1 INPUT 1 1 1 I bu11>UT 1 W
s 1 o o 1 o o o o o NUMERICAL VALUE A4 A3 A2 A1 NUMERICAL VALUE B4 133 132 B1 57110135 x v
o o o o 1 1 o A > .B o 1 o
o 1 1 1 o 1 A < B 0 0 1
o 1 1 o 1 1 A 3 3 v 0 1 1
1 o o 1 1 o A S B 1 o o
1 o 1 1 1 o
1 1 1 1 o o ,
1 1 1 1 1 1
1 1 1 -1
1 1 1 1
o o o o
0
0
O
0
0
O
0
1
1
1
D
AOOH-d-taa.
O-IdHOOdoo
Notes: _
1. Wired OR is available far Bl/RBO (Bl; BLANKJNG INPUT, HBO; RIPPLE-BLANKING OUTPUTL To drive seven-segment 1
indication tube, this terminal shall be kept open or shall be 1. .
To make indication of 0 in decimal number, RBI input shall be open or shall be 1.
Both 1 or 0 are acceptable for mark X in this truth table.
2. When Bl input is 0, every segment output is set to 1 no matter what the other inputs are.
. When RIPPLE-BLANKING INPUT (RBI) adn data inputs A, B, C and D are 0, every segment output is set to 1 and R30 output
4. When Bl/RBO input is 1 and LAMP-TEST INPUT (LT) is 0, every segment output is reset tell
to
T|MING CHART
f 1) yzzlssznomnmauma 12¢. 5559107111131115
INPUT 1 n -L___-1-J-1X.__-___-AX
L T 61 srnoss A1
Rsz-,-1_.__.__ x ........ x 1
LEI/HBO LJ--- case of R50 1:336 If BI
r ,
am
121 1-1 J'T-1 r-1 l"'Ll-l 1-
c1_n.__rLr-Ln_n_1--L_1_
OUTPUTMW
e'LHJ LJLrLI 1.1-1.1 1.er LILJ
{W
1-1 11 11-1 11 n r-
_17_ . v -18-