Radio Shack TRS-80 Service Manual page 85
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Also See for TRS-80:
- Reference manual (274 pages) ,
- User manual (236 pages) ,
- Service manual (199 pages)
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X·RADIATION
12
11
SCHEMATIC NOTES:
I. RESISTOR VALU6S ARE IN OHMS,
~'1000.
2.CAPllCITOR VALUES GREATER THtlN 1.0 liRE IN o.
THOSE 1.0 AND LESS liRE IN )lFD.
U~LESS
OTHEf'-
WISE DESIGN4\TED.
..1-
3. VOLTAGES MEtlSURED WITH RESPECT TO
-=
USIN:; A
"VOLTOHMYST". NO SIGNAL APPLIED AND SHOULD
~OLO
WITHIN
~20%.
4. ALL RESISTORS 1/4 WATT, UNLESS OTHERWISE INDICATED.
+INDICATES GROUND.•
..
INDICATES 5'% TOLERANCE.
lit- ..
IN DICATES 2 % TOLERANCE.
.. if!- ...
INDICATES I % TOLERANCE.
[
]RELATES TO ZONING ON PERIMETER OF DRAWING.
THIS PRODUCT CONTAINS CRITICAL MECHANICAL AND
ELECTRICAL PARTS ESSENTIAL FOR \X·RADIATION
PROTECTION. SEE PAGE 6 OF SERVICE DATA FOR
SPECIFIED REPLACEMENT PARTS. NOMINAL 2ND ANODE
VOLTAGE IS 12.0kV FOR A VERY DIM PICTURE AND MUST
NOT EXCEED
16.0kV UNDER
ANY OPERATING
CONDITIONS. THIS INSTRUMENT CONTAINS NO HIGH
VOLTAGE ADJUSTMENT. SEE PAGE 5 OF THIS SERVICE
DATA FOR OTHER SERVICE ADJUSTMENTS
---,
I
I
I
I
I
I
I
I
I
I
_=.J
E 501
R 523
1 MEG.
VIOl
-
10
E505
-
C525
~ _ _ 1°' i °1f-°_ _ ~~ _ _
-l
;~~~c~C
R524
2.5 MEG.
FOCUS
,01
1 kV
C527
-
9
-
C520
-
- -
1500
112W
R123
8
BOOST
n021
C518
l)lF
150V
C519
+
3~6'~
I
-.J
R518
470K
1/2 W
E801
- - -
R516
lMEG .
lW
-C;-;;J
Dlf--
..-..=-1------,
-=
1 kV
E304
C513
. 01
1 kV
CR504
DAMPER
DO
NOT
MEASURE,
-
-
E502
- -
7
TO PIN 4
EDGE BOARD CONNECTOR
[I-G
J
- -
6
L
I
I
I
L502
HORIZONTAL
DRIVER
TRANSFORMER
C611
3300
R629
220
Q502
HORIZ.
DRIVER
E602
lOOK
R301
TO
+80V
BOOST
[8-G]
-
R514
470
- - -
5
680
L302
22pH
R306
R511
330
- -
R510
47K
.1
R302
4
C301
220K
R624
16K
1/2W
+
80V
(8·GJ
R508
2200
""1/1;»------'
HORIZ
OSC.
(HOLD)
- -
R622
120
l80K
R625
9.Z/IV
C507
.033
608
R507
1500
C609
.I
R506
10K
+
C506
5.61l
F
20V
504
.018
- - -
-
R616
3.9
R615
10K
C608
R614
47pF
15K
6800
lo.lIV
R610
-
lOOK
R611
C606
+
220pF
15V
82K
R608
R607
220K
-
R501
1500
C503
.033
R502
+18V
4700
[jl-f]
R704
3900
2
+18V
QI-F]
-
Q601
SYNC AMP
C603
7!JJV
1000
C702
270
-.1I0V
- - - -
+12V
'!IDEO INPUT
R602
470
r
I
GND
[9A]
~~04
NC
R703*
~G_N_O-++-+-~
(,.5Me
ll
.
I
I
L
6~--+-+-+-1f-""'-f-{
10
B
E
o
A
c
F
H
G
FIGURE 3. VIDEO MONITOR ASSE!VlBLV SCHEMATIC DIAGRAM
78
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