Radio Shack TRS-80 III User Manual

12
I
I
I
I
I
I
I
I
I
I
11
SCHEMATIC NOTES,
L RESISTOR VALU6S liRE IN OHMS. :(. 1000
2CAPIICITOR VIILUES GREATER THIIN 10 liRE IN
THOSE 1.0 ANO LESS liRE IN jJFD .. UNLESS OHIEP-
WISE DESIGNIITED. -L
3. VOLTAGES MEASURED WITH RESPECT TO -=- USIN" II
"VOLTOHMYST':.
NO SIGNAL APPLIED AND SHOULD '10LD
WITHIN ::20%.
4 .. ALL RESISTORS 1/4 WATT, UNLESS OTHERWISE INDICt>;lED
+INDICATES GROUND.•
*" INDICATES 5"1. TOLERANCE
*' *' INDICATES 2% TOLERANCE.
*' * ->if INDICATES I % TOLERANCE.
[ ] RELATES TO ZONING ON PERIMETER OF DRAWING.
E501
R523
1 MEG
V101
CR506
t t
C523 C524
47~t~I 33~t~I
10
E505
C525
r- __ l°-l°lf-° __ ~~ __ ~ ;~~~C~C
1
C522
1000
R524
2.5 MEG
FOCUS
C521
.01
1 kV
----
9
C520
FB504
8
BOOST
C518
ljJF
150V
R518
470K
1/2 W
R516
lMEG.
lW
7
--
E502
C513
. 01
1 kV
CR504
DAMPER
-
DO
NOT
MEASURE,
6
FB502
Q503
HORIZ
,OUTPUT
-/-)
HEAT SINK
L502
E602
HORIZONTAL
DRIVER
TRANSFORMER
R629
220
Q502
HORIZ.
DRIVER
11.2V
-
R514
470
C52S
4.7jJF
50V
C510
.01
5
L302
8.DOV
Q501
HORIZ
OSC.
.3OY
R513
330
C301
R511
330
C509
.027
TO PI N 4 Ejill
r
R301
EO_G_1:_B-4T .... GR_3_CO_N_N_E~Cl_0_R ._E-t~II-_I --~_.-j~12"".S~V __ ....,
.~ I OSlO
~ E302 R123
----------------......,11·::-'1· ~----+---+=~
112W
L-N\I'--+-vW~ .-_E-i
3
111
0
_
3
=- ---1
~ I
TO E305
t80V +--IIII--:::----------...J
BOOST
[S-G]
-.50V
R509
560
-
R624
16K
1/2W
R510
41K
4
+ SOV
(8-Gl
"" llO=oi-- __ R_~_I~..J
R50S
2200
HORIZ
OSC.
(HOLD)
R622
120
ISOK
R625
9.26V
C501
.033
608
R507
1500
C609
.1
R506
10K
+
C506
5.6jJF
20V
R616
3.9
C60S
47jJF
504
.01S
--
3
-
15K
R615
10K
R614
R50
12K
R504
56K
lOOK
R611
C606 +
220jJF
15V
R60S
C502
CR501 1000
C302
220
R607
220K
R501
1500 C501
2
R502
+18V 4700 '-- -... __ +- __ +-_---'
l}H~
R704
3900
+18V
Ol-F]
--
Q601 S2K
SYNCAMP C603
15JV 1000
C702
270
R602
470
R308
270
-.80V
----
'{IDEO INPUT.--..-V'
R
V'3
V
07'-,-1!-t
47 j
670V
I
I
[9A] ~~04
R703"
oE---+-+_-i---' (1.5Me
9
.
I
I
I
I
I
I
I
I
I
I
I
I
I
E
B
A
o
c
F
G
H
fiGURE 3. VIDEO MONITOR ASSEMBLY SCHEMATIC DIAGRAM
78

Radio Shack TRS-80 III Specifications

General

Brand	Radio Shack
Model	TRS-80 III
Category	Desktop
Language	English