RCA Trans Vista 100 User manual

Technical Manual
The CTC 49 Color Chassis

Trans Vista 100
Technical Manual
The CTC 49 Color Chassis
Prepared By
RCA Sales Corporation
A Subsidiary of RCA Corporation
Product Performance— Technical Training
600 North Sherman Drive
Indianapolis, Indiana 46201
Trademark(s) , ARegistered Marca(s) Registrada(s)
Copyright © 1970 by RCA Sales Corporation
All rights reserved. No part of the material protected by this copyright
may be reproduced or utilized in any form without written permission
from copyright owner.
Price $ 4.50
First Edition 7032
Punted in U.S A.

• " " ell• - 4, 4re*
e
•

CONTENTS
General Description 1
RF and IF System 7
The Video System 15
Horizontal Deflection 27
Vertical Deflection 35
First- Level Maintenance 43
Shop- Level Maintenance 57

1

FOREWORD
The CTC 49 chassis represents the first of a " new breed" of RCA
all- solid-state color television receivers. This is particularly true from
the standpoint of servicing. The extensive use of plug-in circuit modules,
eleven in all, a tuner which may be exchanged without the need for
realignment of the coupling circuit to the IF amplifier, a solid-state
high- voltage quadrupler, which essentially is another module, and the use
of plug-in transistors makes it possible to correct most failures with
very little servicing effort.
In the preparation of this manual less than the usual space was
devoted to circuit description for three reasons. First, some of the circuitry
bears a close resemblance to earlier RCA chassis. This is true of the
tuner, AFT, and horizontal deflection system, which are similar to their
counterparts in either the CTC 40 or CTC 47 chassis; and the
sound module which is almost identical to the one used in the CTC 41, 42,
and 43 chassis. Second, integrated circuits are used in the IF and
chroma circuits, and a stage- by- stage analysis of these systems has little
value to the service technician, since many active devices are packaged
in a single unit. Third, since most repairs can be accomplished most
readily by module replacement, rather than by replacement of a single
component, an intimate knowledge of the function of each part in a
module is not essential to the technician.
Complete schematic diagrams of the various circuits were used instead of
partial or simplified diagrams. This will allow the technician to identify
all components of a particular circuit without tracing the interconnecting
lines used in the complete instrument schematic which is bound in the
back of this manual. Whenever possible the location of components in the
diagrams located in the text is indicated; however, the complete
instrument schematic should be consulted to verify component locations
and intermodule connections.
Servicing information contained in this manual is divided into two chapters.
The first of these discusses techniques and procedures for rapid
servicing either in the home or the shop. The final chapter goes into greater
detail and considers those areas of servicing which require the
facilities and equipment normally found only in the service shop.

GENERAL
DESCRIPTION
The RCA CTC 49 chassis is a fourth- generation
solid-state color receiver, employing, for the first
time, plug-in modules for most of the essential
functions. The CTC 40 chassis, introduced in 1968,
is the first of the RCA solid-state color receivers;
however, a vacuum- tube high- voltage rectifier was
used in that instrument. Next in order of introduc-
tion was the RCA CTC 47 chassis ( the G-2000),
which was released in 1969. This instrument re-
tained most of the circuits used in the CTC 40, but
several significant changes were incorporated in
its design. The electronically tuned VHF tuner and
signal- seeking UHF tuner of the CTC 47 are im-
portant advances in the state of the electronic
art, and because of their spectacular perform-
ance they tend to overshadow two other important
advances. These are solid-state high- voltage rec-
tification, using a voltage quadrupler, and motor-
less remote control, of volume, tint, and color.
The RCA CTC 44 chassis represents the third gen-
eration of solid-state color receivers and corn-
prises many of the basic circuit configurations of
the CTC 40, upgraded in many respects, plus the
high- voltage quadrupler and motorless remote
control of volume, tint, and color, from the CTC 47.
The CTC 49 is a natural outgrowth of these prede-
cessors; however a number of radical changes
have been made. Two of these are perhaps equal-
ly significant. These are modular construction, and
the extensive use of integrated circuits. Other ad-
vances include active side- pincushion correction,
transformerless vertical output, matrixing of the
color- difference and luminance signals before they
are fed to the kinescope, significant changes in the
convergence circuits, and a 110 color kinescope.
These will be described in this book, but before
proceeding to circuit descriptions, an overall
examination of the chassis is in order.
Figure 1-1 is a block diagram of the RCA CTC 49
chassis. A total of eleven plug-in modules is
used; a brief description of each module follows:
1

UHF
ANTENNA
—11e.
VHF
ANTENNA
UHF
TUNER
VHF
TUNER
4.5- MHz
SOUND IF
AF T
kT
MODULE MAH
HORIZ AFC
HORIZ OSC
HORIZ
TRIGGER
MODULE PM 200
SOUND DETECTOR
AUDIO PREAMP
MODULE MAK
SIGNAL I PIX IF
AGC
AGC AFT
VIDEO PREAMP
BLACK AND WHITE
VIDEO
SYNC
MODULE MAG
VERT SWITCH
VERT PREDRIVER
VERT DRIVER
SWEEP AND H. V.
REGULATOR
0401-T402
MODULE MAB
LOW- VOLTAGE
RECTIFIERS
AUDIO DRIVER
AUDIO 0 301
AUDIO OUTPUT
0103
il CH MODULE MAC
CHROMA ROMA BANDPASS
REFERENCE OSC
ACC
AFPC
1
MODULE MAL
FIRST VIDEO AMP
SECOND VIDEO AMP
SYNC SEPARATOR
VERTICAL
fie
VERTICAL OUTPUT
Q101-0102
SIDE PIN CORRECTION
HORIZ DEFLECTION
SCR 101- SCR 102
FLYBACK XFMR
KINE SCREEN SUPPLY
11*- 1- 220 ( VIDEO)
+160 ( HORIZ)
+77 ( VERT)
m- + 30 ( AUDIO)
a.. + 30 ( DIST)
B- W
VIDEO
YOKE
CURRENT
PHUOLRSIEZ
CHROMA
MODULE MAE
3 58 REF ICHROMA DEMODS
R- Y
BY
G Y
MODULES MAD
3 ARE USED— ONE
FOR EACH COLOR
COLOR VIDEO OUTPUT
AMPLIFIERS
CONVERGENCE
BOARD
RETRACE H.V. QUADRUPLER
PULSE
FOCUS BLEEDER
CONVERGENCE
BOARD PW 800 1 AGC GATE
in. BURST GATE
HORIZ AFC
PW 800
YOKE CURRENT
SPEAKER
RED VIDEO
BLUE VIDEO KINESCOPE
GREEN VIDEO I CATHODES
CONVERGENCE
ASSEMBLY
YOKE CURRENT
• Ile. VERT YOKE
SIDE
PINCUSHION
AMP
HIGH VOLTAGE
FOCUS VOLTAGE
SCREEN VOLTAGE
KINE SCOPE
HORIZ YOKE
Figure 1-1 Functional Diagram of the RCA CTC 49

Module MAK
The active devices in this module are two transis-
tors and two IC's. IC 1 contains all the IF amplifiers
and the keyed- AGO circuit. IC 2 is used for AFT.
Q1 is the voltage regulator transistor for IC 1. 02
is the video preamplifier, an emitter follower which
couples the video detector and amplifier contained
in IC 1 to modules MAC and MAL.
Module MAC
The single active device in this module is IC 1,
which performs all the functions of the chroma-
bandpass amplifiers, color killer, ACC, AFPC, and
3.58- MHz reference oscillator found in earlier re-
ceivers. In addition, a DC reference voltage devel-
oped in this IC is used as control voltage for the
voltage regulator of Module MAE. In turn, regu-
lated voltage, -- I 11.2 volts, is supplied to this mod-
ule from Module MAE.
Module MAE
This module performs functions similar to the dis-
crete- component chroma demodulators and color-
difference amplifiers of the OTO 40 and OTO 47.
All this is performed in IC 1. The single transistor
in this module, 01, provides regulated 11.2 volts
for Modules MAC and MAE.
3

Module MAL
Two video amplifiers and the sync separator are lo-
cated in this module. The brightness limiter,
brightness control, peaking control, and contrast
control ( located on PW 300) are connected into
this module.
Module MAD
Three of these modules are used, one for each
color of video. Black- and- white video from MAL
is fed to all three of the MAD modules; the appro-
priate color- difference signal from MAE is applied
to each of them. The outputs of the three MAD
modules are fed to the cathodes of the kinescope.
Two transistors are used in each MAD module.
Module PM 200
The sound detector, which recovers audio from the
4.5- MHz sound signal, and the low-level audio
amplifier are combined in a single integrated cir-
cuit which is mounted with several passive com-
ponents in this plug-in module.
Module MAB
Six diodes, used as power- supply rectifiers, part
of the degaussing circuit and several minor com-
ponents are located on Module MAB. The power
transformer and filter capacitors are located on
the main chassis.
4

Module MAH
The circuit of Module MAH is similar to the hori-
zontal AFC and oscillator circuit of the CTC 40
chassis. Q1 is the sync phase splitter and Q2 is
the blocking- oscillator transistor. One additional
active device, Q3, is used in the AFC system.
Module MAG
The vertical- deflection system uses the Miller cir-
cuit, familiar from its use in several earier solid-
state receivers. The switch, predriver, and driver
stages are in this module. The vertical- output
transistors are mounted on the main chassis.
Four major boards are used. PW
200 mounts various controls—
contrast, noise, the three screen
controls, kine bias, height, ver-
tical hold, and the three- position
service switch. PW 300 serves as
the parent board for all modules
except MAB, MAH, and MAG.
The audio- driver and brightness-
limiter transistors, Q301 and
Q302, the three kine drive con-
trols, plus various passive com-
ponents also are mounted on PW
300. Modules MAH and MAG are
mounted on PW 400, as are most
of the components of the hori-
zontal deflection and high volt-
age systems, the high- voltage
regulator, and the side- pincush-
ion amplifier and control poten-
tiometer.
9u608.50!
2741023-5
5

The main chassis mounts the power transformer
power- supply filters, the audio- output trans stor
two vertical- output transistors, high - vol - age quad-
rupler and focus bleede- and the SCR's and di-
odes of the horizontal- deflection system. The
power supply utilizes a transformer; however, one
side of the AC line is connected to the chassis.
The DC outputs and their principal uses are as
follows:
1. The 220- volt source powers the kine div-
ers, Modules MAD A half- wave rectifier and
an RC pi filter is used.
2. Four diodes in a bridge configuration pro-
vide two outputs. One of these provides
about 77 volts to the vertical- output transis-
tors. Capacitive filtering is used. The sec-
ond output is divided into separate sup-
plies— one for the low - leve" transistors
throughout the instrument; the other for the
audio system. Both are nominally 30- volt
sources and both use RC pi ' ilters.
3. A half- wave rectlfier with an LC pi filter sup-
plies 160 volts to the horizontal deflection
system.
As illustrated in the schematic diagram, Figure 1-2,
the degaussing circuit is rather unusua . T101 is
the power transformer ( for simplicity several w.nd-
ings are deleted from this schematic) and S102
is the Normal/High line switch. At turn- on the re-
sistance of AT 1 is low and the degaussing current
is high. As R 1 warms, its resistance increases
until the degaussing current approaches zero.
After warm-up the voltage drops across R4 and
RI 1 are equal to the voltages across the upper
and lower transformer windings, respectively, mak-
ing the voltage across the degaussing coil zero.
The current which still flows through R4 and RT 1
keeps the latter warm, to maintain its high resist-
ance.
AC { POWEF
Figure 7-2 Simplified Degaussing Circuit
6

RF and IF SYSTEM
Except for a minor change in the biasing of the
RF amplifier and revamping of the mixer output to
lower its impedance, the KRK 165 VHF tuner used
in the CTC 49 is the same as the KRK 142 of the
CTC 40 chassis. Both are four- tuned- circuit, wafer-
switch tuners using a MOSFET RF amplifier, a
cascode type mixer, and AFT controlled local os-
cillator.
In the KRK 165, AGC bias is applied to only one
gate of the MOSFET, instead of both gates as in
the KRK 142. This circuit change is shown in Fig-
ure 2-1.
AGC
INPUT
NOT IN
KRK 165
RF INPUT
Figure 2-1 Simplified RF Amplifier
DRAIN
SOURCE
El+
The familiar " link circuit" which has been used
with minor variations for several years has been
replaced by a terminated coaxial line which inter-
connects the tuner and the IF amplifier. This coup-
ling method makes the tuning of the mixer and the
IF- amplifier input independent of each other; also,
the length of the interconnecting cable no longer
is critical.
The mixer- output circuits of the KRK 142 and
KRK 165 are shown in Figure 2-2. Operation of
the " Low C" output circuit of the KRK 142 was
amply explained in SOLID STATE COLOR TELE-
VISION, to which the reader may refer. In the
KRK 165, the 82-pF capacitor has been removed
and a 47- ohm resistor has been inserted in series
with the output.
As it will be explained later, the input impedance
of the IF amplifier is nominally 50 ohms. Therefore,
it is desirable that the output impedance of the
mixer, as seen " looking back" from the IF ampli-
fier, also be nominally 50 ohms. As seen from the
output, the combination of L1 and C1 is a series
resonant circuit which has a very low impedance
to ground, and this impedance is in series with the
47- ohm resistor. Thus the link cable itself, type
AG 58A/U, is terminated by its characteristic im-
pedance, and its length is not critical.
7

+15
+ 15
BIAS
IF OUTPUT
BIAS
SIGNAL
INPUT
A. KRK 142
Cl
12pF
1000pF
Li
SIGNAL
INPUT
B. KRK 165
47
Figure 2-2 Mixer Output Circuit of the KRK 142 and KRK 165 Tuners
IF INTEGRATED CIRCUril
As stated in Chapter 1, all IF amplification and the
generation of AGC voltage is accomplished in a
single integrated circuit, IC 1, mounted in the IF
module, MAK 001A. While the actual circuitry of
the IC may be of academic interest, a rigorous
discussion is beyond the scope of this book. For
the present purposes, an examination of the func-
tional block diagram of the IC and an explanation
of the surrounding discrete- component circuits
will suffice.
Referring to Figure 2-3, the IF signal from the
tuner ultimately is developed across L4 and in-
jected, along with AGC voltage, to input terminal
6 of the IC. The first IF amplifier actually consists
of two emitter followers and a common- emitter am-
plifier. The second IF is essentially a common-
base circuit. As signal passes through these cir-
cuits, the AGC voltage is stripped off, modified by
the external noise control, and fed back to the
signal shunt to control the gain. The output of the
second IF stage appears at terminal 9 of the IC.
The interstage coupling circuit is a capacitively
coupled, double tuned system, from which are de-
rived two outputs. One of these is fed to terminal
12, where it is amplified and detected. The 4.5-
MHz intercarrier signal generated in this detector
IF OUTPUT
is amplified and conducted from terminal 2 of the
IC to the sound module, PM 200.
The second output from the interstage coupling
circuit reenters the IC at terminal 13 and drives an
emitter follower which has two outputs. One of
these outputs leaves the IC at terminal 14; the
other passes through the third IF amplifier to the
video detector. The video detector has three out-
puts, one to the noise- immunity circuit, a second
to the AGC keyer, and a third to output terminal
19. At this point, the video white level is about + 7
volts and sync- tip level is about . 7 volt.
The precise manner in which keyed AGC voltage
is developed and made immune to sync- tip noise
spikes is rather unconventional; but since these
functions take place entirely within the IC, they are
of no particular interest from the standpoint of
servicing. The output of the AGC amplifier passes
from terminal 4, through a filter circuit, and then
back into the IC at terminal 6, along with the IF
signal.
The block connected to terminal 18 is passive,
containing the equivalent of two zeners and a
diode connected in series. A 12- volt drop is
provided for the base of the voltage regulator used
to supply power to several devices in the inte-
grated circuit.
8

IF INPUT BD -
s.
6
o
L4
9
1ST & 2ND
IF AMPS
o
01 BASE
IF AMP
INTER STAGE
COUPLING
CIRCUIT
AGC AMP
7
SOUND
DST
el 4.5- MHz AMP
13
NOISE
IMMUNITY
4
14
AFT
gm-
AGC
KEYER d
NOISE
CONTROL
TUNER
AGC
111
Figure 2-3 Functional Diagram of the IF/AGC Integrated Circuit
11111111 =J1IER-IF ' LINK CIRCUIT
Ti
39.75
FROM
TUNER
C2 C3
5.1 I 5.6
MAK 001A
Figure 2-4 Traps and IF Input Tuned Circuits
9
INPUT
2
—0—e-
19 VIDEO
OUTPUT
3
KEYING
PULSE

Signal from the mixer in the VHF tuner is con-
ducted through 50- ohm coaxial cable to PW 300,
and thence to the MAK module. Passing through
Cl and R1 ( Figure 2-4), it next encounters the
parallel paths offered by C2 and C3, Li, C4 and
05, and R2. Traps tuned to 39.75 MHz, adjacent-
channel video carrier, and 47.25 MHz, adjacent-
channel sound carrier, are connected as shown.
Li is a low- Q tuned circuit adjusted for best null-
ing of the 47.25- MHz trap. From the parallel paths
named above, paralleled paths to ground ( having
an equivalent resistance of about 18 ohms) are
provided by R3, the parallel resonant circuit of L2
+15 - 41
and C6, and the series resonant circuit formed by
L3 with 010, C11, and 012. Therefore, the input
impedance seen at Cl is nominally 50 ohms,
matching the impedance of the link cable.
The coupling network consisting of L3, 010, and
C12 ( Figure 2-4), and L4 ( Figure 2-5) tunes the
input of the first IF amplifier, located inside IC 1A.
The adjustment of these components is similar to
the alignment of the link circuit of many earlier
receivers, L3 is tuned to the center frequency of
the IF passband ( about 44 MHz), L4 principally
controls the tilt of the response curve, and C12 es-
tablishes the bandwidth.
AGC AND NOISE CONTROL
MAK 001A
1 FROM
C12 4
SERVICE
SWITCH o s I
o R
I 15
NEGATIVE
HORIZ
RETRACE
NOISE
CONTROL
25K A ir Ar l
L4
C15
R6
-1 - - - ' 001
3.3K
, VV\.
R4
10
TP 3
C17
1 - . 001
-r R10
-- =••7 100K
R9
56K T - C16
± 10e
•
R302
470K
R305 CR 301 R304
27K
C301
.01
+15-s
1.8M
CR 302
R307
3.3K
14
C13
.01
I VV\e-
13
R310
§ 12K
R8
18K
C20
1.3
• TO
L6
_L C19
10
=-"
+30
+30V
DIST
R11
4.7K
1 11-11---/VV\i-•
__. C21
R12
10K
11
R303
180K
TUNER
AGC
Figure 2-5 First and Second IF Amplifiers and AGC Circuits
10
R317
47

R10 is the collector load resistor of the AGC-
amplifier transistor located inside the IC and con-
nected to terminal 4. Depending on the level of
input signal to the receiver, the voltage at terminal
4 will vary slightly, above and below to about + 2.7
volts. As it becomes more positive. the IF gain is
increased. This voltage is applied to the bottom of
L4, and thence to terminal 6 of the IC along with
the IF signal.
Notice that when the service switch is in the nor-
mal position one end of R9 is grounded. In either
the raster or service position of the switch, the
ground is removed and R9 is connected via R302
to the anode of CR 301, which has a potential of
about 100 volts. The portion of this voltage
which is applied to terminals 4 and 6 of the IC
cuts off the IF amplifier for servicing.
Before discussing the operation of the noise con-
trol and tuner AGC circuits of Figure 2-5, it is ap-
propriate to review the fundamentals of AGC
operation. Since the output level from the video
detector must be held constant, it is obvious that
the receiver gain to this point must be made in-
versely proportional to the signal strength. This,
of course, is the purpose of AGC. Since the range
of signal strengths which a receiver must process
may vary from perhaps 15 microvolts to 150 milli-
volts, the ratio of receiver gain from maximum to
minimum is in the order of 10,000:1. To design a
single stage having this much dynamic range is
difficult; but two amplifiers each having a dynamic
range of 100:1 will fulfill the same requirement and
are more easily constructed. For this reason, the
gains of both the tuner RF amplifier and the first
IF amplifier ( and sometimes the second IF ampli-
fier) are controlled.
The ability of a receiver to produce a useful pic-
ture from a very weak signal depends upon the
amount of noise generated within the receiver it-
self. Since most of this harmful noise is generated
in the tuner, it is desirable to amplify the signal
as much as possible in the RF amplifier, to main-
tain the ratio of signal to noise as great as possi-
ble. For this reason it appears that it always
would be desirable to operate the RF amplifier
at maximum gain; however, this could cause
the mixer to overload and produce beats during
reception of strong signals. The solution to this
problem is to design the AGC system so that the
RF amplifier operates at maximum gain on all
signals weaker than some predetermined level,
perhaps 1000 microvolts; above this level, tuner
noise no longer is detrimental, and the gain of the
RF amplifier is reduced progressively by the AGC
as stronger signals are received. This is called
AGC delay.
In the OTO 49 chassis, the AGC voltage from ter-
minal 7 of IC 1 ( Figure 2-5) is more positive than
+6.7 volts under no- signal conditions, but the
diode action of the zener, CR 302, clamps the
amer AGC voltage to + 6.7 volts. As signal strength
is increased, the terminal- 7 output drops, and falls
below 6.7 volts at about 1000 microvolts; however,
until this point is reached, the gain of the RF tuner
is maximum and receiver gain is controlled by
the IF AGC.
Further increasing the signal beyond 1000 micro-
volts ( nominal) causes the tuner AGC voltage to
swing downwards from 6.7 volts toward a nega-
tive maximum. When it reaches - 5 volts, CR 302
conducts in the zener mode, preventing a further
negative swing. This is the minimum- gain operat-
ing point of the RF amplifier. Beyond the point
where the tuner begins operating at minimum
gain, the gain- controlled IF amplifier again con-
trols overall gain.
To summarize AGC action, there are three distinct
modes of operation, depending on signal strength:
1. No signal to about 1000 microvolts — RF
gain is maximum to provide best possible
signal-to-noise ratio of the receiver. IF AGC
maintains constant video output from the
detector.
2. About 1000 microvolts to perhaps 100 milli-
volts — RF gain is decreased by the AGC
voltage to maintain constant output from
the video detector. IF gain is substantially
constant.
3. Above about 100 millivolts — RF gain is held
at minimum to prevent overload of the
mixer, and IF gain is decreased by AGC
to maintain constant video- detector output.
The function of the noise control is to allow the
service technician to predetermine the amount of
signal strength at which AGC operation shifts
from the first to the second mode and, of course,
from the second mode to the third. For example.
in a suburban or rural area where all signals are
relatively weak, the noise control may be set to
allow maximum RF gain ( and minimum noise); in
a strong- signal area, the noise control may be set
to minimize RF gain and the possibility of mixer
crosstalk.
11

IC 1A
IF, VIDEO PREAMP, AND AFT
The schematic diagram in Figure 2-6 shows the
remaining section of IC 1 and those external circuit
components which connect to it. Notice that L5,
C19, and C20 are shown on both Figures 2-5 and
2-6. Signal from the second amplifier appears at
terminal 9 of the IC and is coupled to the third IF
amplifier input, terminal 13.
The collector of the second IF is tuned to about
the center of the IF passband ( 44 MHz) by L5 and
019. Energy is coupled via C20 to L6, which is
tuned to remove tilt from the response curve. 41.25-
MHz sound- carrier energy is removed from the
IF signal before it reenters the IC at terminal 13,
but this energy still is present at the take-off point
to the IF amplifier whose input is at terminal 12.
As stated earlier, the circuits in the IC between
terminals 12 and 2 amplify the IF, produce the 4.5-
+30
R11
27K
C21
1000
C19
10
I I
C20
1.3
F- •
C22
T4 ( 41.25 _ L I C 23
3.6 220
R15
8.2K
MHz intercarrier sound signal, and amplify it for
injection into the sound module, PM200.
The IF signal fed into terminal 13 is amplified, de-
tected, and amplified; the resulting video signal
appears at terminal 19. The video signal at this
point has a peak- to- peak amplitude of about 6.3
volts with negative- going sync; sync- tip level is
about + . 7 volt. Passing through the 4.5- MHz trap
and the preamplifier, Q2, the video is fed from the
IF module to the video module, MAL. A second
output from the preamplifier is developed across
the chroma peaking coil L7, and fed to the first
chroma module, MAC.
QI is a regulator transistor which supplies voltage
to a number of devices in the integrated circuit.
Base voltage for QI is established by a 12- volt
TO AFT
VOLTAGE
01
C27 L12
C28
IF
120
1.8
R1 6 C26
330 . 022
REGULATOR 680
R13
2.2K C25 --
L- - 11
MAK 001A
FLYBACK
PULSE
I - 01
R318
10K
/ VV\i
L10
15 H
10
19
MAC
C32 C31
160 56
C33 3
1-
160
R18 C29
330 180
R19
1K
L11
12
+30
R22
330
02
VIDEO
PREAMP
R21
1K
4.5 MHz
TRAP
4.5 MHz
TO PM 200
Figure 2-6 IF Output and Video Preamplifier
12
R324
2.2K
MAL