201 James Record Road - Huntsville, Alabama 35824-1513
Copyright September 1999 by Zenith Electronics Corporation
Page 2
PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO-VIDEO PRODUCTS
IMPORTANT SAFETY NOTICE
This manual was prepared for use only by properly trained audio-visual service
technicians.
When servicing this product, under no circumstances should the original
design be modified or altered without permission from Zenith Electronics
Corporation. All components should be replaced only with types identical to
those in the original circuit and their physical location, wiring and lead dress
must conform to original layout upon completion of repairs.
Special components are also used to prevent x-radiation, shock and fire hazard.
These components are indicated by the letter “x” included in their component
designators and are required to maintain safe performance. No deviations are
allowed without prior approval by Zenith Electronics Corporation.
Circuit diagrams may occasionally differ from the actual circuit used. This way,
implementation of the latest safety and performance improvement changes into
the set is not delayed until the new service literature is printed.
CAUTION: Do not attempt to modify this product in any way. Never perform
customized installations without manufacturer’s approval. Unauthorized
modifications will not only void the warranty, but may lead to property damage
or user injury.
Service work should be performed only after you are thoroughly familiar with
these safety checks and servicing guidelines.
GRAPHIC SYMBOLS
The exclamation point within an equilateral triangle is intended
to alert the service personnel to important safety information in
the service literature.
The lightning flash with arrowhead symbol within an equilateral
triangle is intended to alert the service personnel to the presence
of noninsulated “dangerous voltage” that may be of sufficient
magnitude to constitute a risk of electric shock.
The pictorial representation of a fuse and its rating within an
equilateral triangle is intended to convey to the service personnel
the following fuse replacement caution notice:
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE,
REPLACE ALL FUSES WITH THE SAME TYPE AND RATING AS MARKED
NEAR EACH FUSE.
SERVICE INFORMATION
While servicing, use an isolation transformer for protection from AC line shock.
After the original service problem has been corrected, make a check of the
following:
FIRE AND SHOCK HAZARD
1. Be sure that all components are positioned to avoid a possibility of
adjacent component shorts. This is especially important on items transported to and from the repair shop.
2. Verify that all protective devices such as insulators, barriers, covers,
shields, strain reliefs, power supply cords, and other hardware have been
reinstalled per the original design. Be sure that the safety purpose of the
polarized line plug has not been defeated.
3. Soldering must be inspected to discover possible cold solder joints, solder
splashes, or sharp solder points. Be certain to remove all loose foreign
particles.
4. Check for physical evidence of damage or deterioration to parts and components, for frayed leads or damaged insulation (including the AC cord), and
replace if necessary.
5. No lead or component should touch a receiving tube or a resistor rated at
1 watt or more. Lead tension around protruding metal surfaces must be
avoided.
6. After re-assembly of the set, always perform an AC leakage test on all exposed
metallic parts of the cabinet (the channel selector knobs, antenna terminals,
handle and screws) to be sure that set is safe to operate without danger of
electrical shock. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS
TEST. Use an AC voltmeter having 5000 ohms per volt or more sensitivity in
the following manner: Connect a 1500 ohm, 10 watt resistor, paralleled by
a .15 mfd 150V AC type capacitor between a known good earth ground
water pipe, conduit, etc.) and the exposed metallic parts, one at a time.
Measure the AC voltage across the combination of 1500 ohm resistor and
.15 mfd capacitor. Reverse the AC plug by using a non-polarized adaptor
and repeat AC voltage measurements for each exposed metallic part. Voltage
measured must not exceed 0.75 volts RMS. This corresponds to 0.5 milliamp
AC. Any value exceeding this limit constitutes a potential shock hazard and
must be corrected immediately.
A.C. Voltmeter
Good Earth Ground
such as the Water
Pipe, Conduit, etc.
0.16uF
1600 OHM
10 WATT
Place this probe
on each exposed
metal part.
X-RADIATION
1. Be sure procedures and instructions to all service personnel cover the
subject of x-radiation. The only potential source of x-rays in current TV
receivers is the picture tube. However, this tube does not emit x-rays when
the HV is at the factory-specified level. The proper value is given in the
applicable schematic. Operation at higher voltages may cause a failure of
the picture tube or high-voltage supply and, under certain circumstances
may produce radiation in excess of desirable levels.
2. Only factory-specified CRT anode connectors must be used.
3. It is essential that the service personnel have available an accurate and
reliable high-voltage meter.
4. When the high-voltage circuitry is operating properly, there is no possibility
of an x-radiation problem. Every time a color chassis is serviced, the
brightness should be run up and down while monitoring the high voltage
with a meter, to be certain that the high voltage does not exceed the
specified value and that it is regulating correctly.
5. When troubleshooting and making test measurements in a product with a
problem of excessively high voltage, avoid being unnecessarily close to
the picture tube and the high voltage power supply. Do not operate the
product longer than necessary to locate the cause of excessive voltage.
6. Refer to HV, B+, and shutdown adjustment procedures described in the
appropriate schematics and diagrams (where used).
IMPLOSION
1. All direct view picture tubes are equipped with an integral implosion
protection system; take care to avoid damage during installation.
2. Use only the recommended factory replacement tubes.
TIPS ON PROPER INSTALLATION
1. Never install any receiver in a closed-in recess, cubbyhole, or closely
fitting shelf space over, or close to, a heat duct, or in the path of heated
air flow.
2. Avoid conditions of high humidity such as: outdoor patio installations
where dew is a factor, near steam radiators where steam leakage is a factor,
etc.
3. Avoid placement where draperies may obstruct venting. The customer
should also avoid the use of decorative scarves or other coverings that
might obstruct ventilation.
4. Wall- and shelf-mounted installations using a commercial mounting kit
must follow the factory-approved mounting instructions. A product mounted
to a shelf or platform must retain its original feet (or the equivalent
thickness in spacers) to provide adequate air flow across the bottom. Bolts
or screws used for fasteners must not touch any parts or wiring. Perform
leakage tests on customized installations.
5. Caution customers against mounting a product on a sloping shelf or in a
tilted position, unless the receiver is properly secured.
6. A product on a roll-about cart should be stable in its mounting to the cart.
Caution the customer on the hazards of trying to roll a cart with small
casters across thresholds or deep pile carpets.
7. Caution customers against using a cart or stand that has not been listed
by Underwriters Laboratories, Inc. for use with its specific model of
television receiver or generically approved for use with TVs of the same or
larger screen size.
8. Caution customers against using extension cords. Explain that a forest of
extensions, sprouting from a single outlet, can lead to disastrous
consequences to home and family.
SR21ACH - SAFETY
i
Page 3
PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO-VIDEO PRODUCTS
X-RADIATION
To prevent possible exposure to x-radiation caused by excessive
CRT Anode Voltage, the CH Chassis incorporates a “High Voltage
Shutdown” circuit. This circuit senses the level of a flyback pulse
from the “Flyback Transformer” representative of the actual high
voltage on the CRT anode. When this level exceeds a predetermined
voltage, the circuit shuts down the horizontal drive, preventing
further generation of anode voltage. In this condition, the horizontal
drive is ‘‘latched’’ off. The drive will remain off until power (via
remote control or front panel) is re-cycled from ‘Off’ to ‘On’.
SHUTDOWN CIRCUIT OPERATION
(Refer to Figure below)
Apply a voltage signal of an external power supply through the
shutdown circuit (Refer to Figure shown below). Connect an accurate
high voltage meter between the picture tube anode and chasis
ground. Access the Video Menu and adjust Brightness and Contrast
controls for minimum screen luminance. Wait until the Video Menu
or display disappear. Read the high voltage meter, ramping up the
external power supply from 4 to 8 volts, until the circuit shutsdown.
Measurement of the CRT Anode voltage must be performed using a
high impedance high voltage meter, with no visible raster on the
screen, and operating at nominal horizontal scanning frequency.
Connect a strong broadcast signal (or TV signal generator operating
at 15.734kHz horizontal scanning rate) to the RF input.
After discharging the CRT, connect a high impedance high voltage
meter to the CRT anode. Turn the television ‘on’ and confirm a good
signal is being displayed. Reduce Brightness and Contrast settings
until the picture is well extinguished.
Observe the Anode voltage meter reading and compare with the
table for the proper CRT screen size. If the voltage reading is higher
than the maximum, verify circuit component values and proper
operation.
NOTE:
The CH Chassis does NOT have a bleeder resistor to discharge
the Anode voltage. High voltage can remain on the CRT Anode
long after power is turned off. Before removing the CRT anode
connection, turn off and unplug the television, then discharge
the CRT Anode to DAG ground.
SAFETY CIRCUIT TEST PROCEDURE
Before turning the TV on, connect the HV meter’s negative probe
(-) to ground (DAG ground recommended) and the positive probe
(+) in the anode of the CRT. Connect a 1 Giga Ohm resistor in
parallel with the HV meter. Then connect the external power supply’s
negative output (-) to chassis ground, that is, the negative lead of
B+ filter capacitor, CX3420. Turn on the TV. Apply a video signal or
tune the TV to a raster pattern. Adjust the G2 potentiometer for
minimum, and set the brightness and contrast levels to minimum.
Now adjust the output voltage of the external power supply to 124
VDC for CA25V/27V or 130 VDC for CA32V/36V. Then start increasing the voltage on the external power supply until the TV shuts
down, and read the HV on the meter just before the voltage starts
dropping.
Equipment required:
a) Video Generator.
b) HV DC meter (0 to 40 KV, high Z).
c) External variable power supply (0V to 200 VDC @ 5Amps
minimum).
d) 1 Giga ohm, 5%, 2W film resistor.
NOTE:
The external power supply may require a diode for blocking
voltage from the chassis power supply to the external power
supply. The diode should be connected between the positive
output of the external power and B+ of the chassis.
The cathode should be facing the B+ of the chassis. The recommended diode is Part No. 103-00339-04A (400 V of VRRM @ 3
Amps of average rectified forward current).
The CH series chassis will be used on the “B” line
Commercial Products. This covers the 19, 20, 25, 27,
32, and 36 inch screen sizes. The concept of this chassis
is to make one board for all models regardless of screen
size. During the manufacturing process, the
microprocessor will be programmed for the added
features.
added to the chassis to accommodate the different features;
PCZTV Scan Converter, Stereo, Mono, FM radio, etc.
sets do not have a comb filter.
The CH series chassis features seven ICs for all signal,
sync, and sweep processing.
Additional plug in boards with Jack Packs will be
These
IC6000
Microcontroller
ICX2200 - Handles all of the audio/video, sync and
sweep drive processing.
IC6000 - Main microprocessor. It is tied directly to the
keyboard and the infrared detector.
IC6001 - System memory.
IC2100 - Handles vertical sweep.
IC2500 - Video switch.
ICX3412 - Power supply. This is a switching type supply
powered by a bridge rectifier circuit. At turn on, voltages
for the vertical and video output circuit are derived
from the sweep circuit.
Some models have video and right/left audio input jacks
at the front of the receiver. These jacks can be used to
view video tapes from a VCR or Camcorder. When the
video cable is plugged into the jack, the shorting jack
J1 opens, placing a high at pin 10 of the IC6000
microprocessor. This switches the TV into the auxiliary
mode. As long as the cables are attached, the TV set will
be locked in auxiliary mode. Use of a remote control or
buttons on the front of the set will not permit switching
into tuner mode until the video cable is disconnected.
SUPERPORT - MPI
Zenith Commercial Product receivers are now being
adapted to interact with other equipment. Prime
examples of this can be found in Lodging and Health
Care situations where the set is controlled from the main
office.
All this is made possible by the new technology that is
being built into these receivers. The SuperPort and/or
Multiple Protocol Interface (MPI) jack and associated
circuitry allow remote control of the set.
MULTIPLE PROTOCOL INTERFACE
Television functions and features are controlled by the
communication of commands and status information
through a Superport by the MPI interface.
EBC (EDGE BOARD CARD)
Allows easy access for removing/installing accessory
modules providing a rail mounted slide-through card.
These cards might contain one of the above features.
CONNECTION CENTER ON BACK OF TV
The connection on the back of the TV contains the
input and output interfaces.
SR21A1-2CH - MAIN
Page 9
CONNECTIONS (continued)
CONNECTION CENTER ON BACK OF TV
The connection center on the rear of the TV allows for
connection of the viewing source. The diagrams list the
use of each jack on the connection center.
1. ANTENNA/CABLE JACK
Use the jack for 75-ohm antenna-type signal connections
to the TV. Attach antenna, cable TV line, or other video
equipment to jack. The input cable may come from an
outdoor or master antenna, cable TV line, cable decoder
box, or the RF output from a VCR.
2. SUPERPORT LOCATION
Provides for easy installation of local service provider
accessory module without removing the cabinet back.
Module is housed inside the TV cabinet and receives
operating power and all necessary interface signals
through internal connections.
3. MPI (Multiple Protocol Interface) JACK
Standard RJ11 jack to provide interface with in-room
entertainment and video services. Also used with
installer’s programmer (page 1-11) for programming other
TVs in the system with the same features as the master
TV.
Super
Port
ANTENNA
CABLE
M. P. I.
ANTENNA
CABLE
VIDEOINMATRIX
OUT
AUDIO
RL
IN
4. VIDEO IN AND AUDIO IN
Use the Video and Audio In jacks for baseband video
and audio input signals from a VCR or other signal source.
5. MATRIX SPEAKER OUT
Use this jack for connection of an 8-ohm extension
speaker to get television sound at a remote location.
The speaker in the TV remains active, while a monaural
audio output is heard from the remote speaker.
6. PILLOW SPEAKER JACK
Use the 6-pin jack for connection of an optional pillow
speaker or wired remote control unit. Recommended pillow
speaker is Curbell Model A-6050-001 or equivalent. Pillow
speaker/control unit is not provided with the TV.
7. PILLOW SPKR/TV SPKR SWITCH
In the PILLOW SPKR Position - The pillow speaker is ON.
In the TV SPKR position - The built-in TV speaker is On.
8. EBC KNOB
For handling-removal of EBC cover.
Super
Port
Super
Port
M. P. I.
ANTENNA
CABLE
M. P. I.
PILLOW SPEAKER
VIDEOINMATRIX
OUT
AUDIO
IN
SR21A1-3CH - MAIN
Page 10
CONNECTIONS (continued)
PILLOW SPEAKER INTERFACE
Description
The pillow speaker interface within the TV, provides three remote control lines and an
audio output. It is intended for connection to a patient-pendant remote control, or
entertainment audio and nurse call system. All lines are isolated from the AC power
line and ground. Isolation of the control lines is provided by optoisolators. These are
no relays or inductive components in the control lines. Isolation of the audio output
is provided by an optoisolator too.
Purpose of Interface Pins
Pin #1 External TVON /OFF closure.
Pin #2 Open (not used).
Pin #3 External Channel Up Closure or Data In.
Pin #4 Common for External Control.
Pin #5 Audio Output. The impedance from this pin to earth ground is a nominal 10
Megohm static leakage resistor in parallel with an 1100 picofarad capacitor.
Pin #6 External Channel Down Closure.
Theory of Multiplexed Data Mode
345
6
1
2
Pins 3 and 4 support a built-in interface which allows
multiple functions on a single wire by means of serial
digital coding. Pin 3 will source up to 2 mA during the
digital "0" interval to supply operating power for the
digital encoder located in the pillow speaker. The coder
must sink a minimum of 5 mA to pin 4 during the digital
"1" interval and provide the correct serial data stream.
Pillow speakers meeting this specification are available
from independent manufacturers such as Curbell, Inc.
(Manufacturers wishing to produce compatible pillow
speakers or other products should contact Zenith Commercial Products for detailed specifications). An isolated
audio output is at pins 4 and 5.
Theory of Simple Switch Mode
Mode pins 1, 3, and 6 are connected to pin 4 by way of
momentary-action switches to activate indicated control function. These pins are 13 Vdc positive with respect to pin 14 when the switches are open. Loop current is 8 mA with the switches closed. Isolated audio
output is at pins 4 and 5. Mode of operation is identical to previous Zenith models using the 5-Wire Interface
with the exception of higher open circuit voltage (was
7 Vcd ) and higher loop current (was 2.5 mA).
SR21A1-4CH - MAIN
Page 11
CONNECTIONS (continued)
Settings Min/Max Volume Levels
Use the following procedure to adjust minimum volume and maximum volume for pillow speaker. This procedure not only
sets the maximum volume level that the pillow speaker can produce, but also prevents the TVs volume from accidentally
being adjusted to level which is too low or too loud.
1. Connect pillow speaker. Place INT/EXT speaker switch on back of TV in EXT position.
2. Set VOLUME control on pillow speaker to maximum volume position.
3. Access Service Menu by following the instructions given in the “Service Menu” section of this book. Select the MAX
volume. Use the ADJUST key to set highest desired volume level within the range of 0 to 63. This will be the highest
desired volume level, as heard at the pillow speaker.
4. elect the MIN volume. Use the ADJUST key to set the lowest desired volume level within the range of 0 to 63. This will
be the lowest desired volume level as heard at the pillow speaker.
5. Make no further adjustments and exit the Service Menu.
The TV is now adjusted for minimum and maximum volume settings. All further adjustments of the TVs volume should
be made by using the VOLUME control on the pillow speaker.
SR21A1-5CH - MAIN
Page 12
USER REMOTE - MBR3447Z
To use the TV functions defined below, make sure that the remote is set to operate TV.
Press TV on the remote to select TV.
POWER
Turns TV On or Off.
FLASHBK ( Flashback)
Returns to previous Channel.
MODE
SURF
Turns Surf Channel On/Off
Selects the remote’s mode of operation
MUTE
Turns soun d O ff an d On
whil e pi cture remains.
CHANNEL (Up/Do wn)
Selects ne xt ch annel in
TV’s memory. Press
and hold to r epe at .
NUMBER PAD
Selects ch annels directly.
MENU
Display s m enus for TV
and other opt ions.
LEFT/RIGHT ARROWS
Chooses and shows the
desired menu option.
A, B, C Ke ys
Special features of some TV’s
TIMER
Displays the Sleep Timer menu.
Press repeatedly to set desired
TV shut-off time.
VOLUME (Left/Right)
Increases TV ’s sound level.
ENTER
Shows Channel/Time, enters
channe l , or r em oves any
on-screen menus.
QUIT/ (Three Functions Key )
Exits from on-screen display, turns
the sound enhancement feature on
or off, and swi tches audio between
Main source and PIP source.
UP and DOWN ARROWS
Moves hi ghlighted bar withi n
menu to select an option.
CC
Display s cl o sed caption menu .
TV/VCR SOURCE
Steps through source options.
MBR3447Z
124-00233
Note:Keys dedicated to VCR functions will still operate the VCR while the
remote is in TV mode.
SR21A1-6CH - REMOTES
Page 13
PATIENT REMOTE - SC637Z
HEALTHVIEW SERIES
This remote control is intended for use by patients, guests and others. It provides access to basic TV and FM radio
operations.
Press to turn TV ON or OFF
POWER
Press to access closed captions.
CC
TV/FM
Press to alternate between
TV or FM operating mode
VOLUME
Press left to reduce or right to
increase volume level of TV.
NUMBERED BUTTONS
Press repeatedly to select
desired menu.
TIMER
Press to activate SLEEP TIMER.
CC
CONCIERGE Series
MUTE
Press to turn off sound while
picture remains. Press again
to restore sound.
FLSHBK
Press to return to last TV
channel you were watching.
CHANNEL Up/Down
Press to select a TV channel by
going up/down through channels
programmed in the TV memory.
ENTER
Press to view Channel/Time or to
remove any on-screen display in
Display
menu or
TV mode. Press to view the Music menu
(active station) listing in FM mode.
CH PREV
Displays on-screen, preprogrammed
directory of station and network
affiliations when in TV mode.
SC637Z
124-00213-05
SR21A1-7CH - REMOTES
Page 14
GUEST REMOTE - SC652Z
CONCIERGE SERIES
This remote control is intended for use by guests and others. It provides access only to basic TV operations.
Press to turn TV ON or OFF
POWER
Press to access closed captions.
CC
VOLUME
Press left to reduce or right to
increase volume level of TV.
NUMBERED BUTTONS
Press repeatedly to select
desired menu.
TIMER
Press to activate SLEEP TIMER.
CC
ALARM
CONCIERGE Series
MUTE
Press to turn off sound while
picture remains. Press again
to restore sound.
FLSHBK
Press to return to last TV
channel you were watching.
CHANNEL Up/Down
Press to select a TV channel by
going up/down through channels
programmed in the TV memory.
ENTER
Press to view Channel/Time or to
remove any on-screen display in
Display
menu or
TV mode. Press to view the Music menu
(active station) listing in FM mode.
ALARM
Press to turn wake-up alarm
ON or OFF .
CH PREV
Displays on-screen, preprogrammed
directory of station and network
affiliations when in TV mode.
SC652Z
124-00213-02
SR21A1-8CH - REMOTES
Page 15
GUEST REMOTE - SC692Z
3
CONCIERGE SERIES
This remote control is intended for use by guests and others. It provides access to basic TV and FM operations.
Press to turn TV ON or OFF
POWER
Press to access closed captions.
CC
TV/FM
Press to alternate between
TV or FM operating mode
VOLUME
Press left to reduce or right to
increase volume level of TV.
NUMBERED BUTTONS
Press repeatedly to select
desired menu.
TIMER
Press to activate SLEEP TIMER.
CC
ALARM
CONCIERGE Series
MUTE
Press to turn off sound while
picture remains. Press again
to restore sound.
FLSHBK
Press to return to last TV
channel you were watching.
CHANNEL Up/Down
Press to select a TV channel by
going up/down through channels
programmed in the TV memory.
ENTER
Press to view Channel/Time or to
remove any on-screen display in
Display
menu or
TV mode. Press to view the Music menu
(active station) listing in FM mode.
ALARM
Press to turn wake-up alarm
ON or OFF .
CH PREV
Displays on-screen, preprogrammed
directory of station and network
affiliations when in TV mode.
SC692Z
124-00213-0
SR21A1-9CH - REMOTES
Page 16
INSTALLER REMOTE - HP602Z
OPERATION
This remote control is available as an optional item for
the equipment installer. It provides access to all onscreen menus and special features that cannot be
accessed from the control panel on the TV.
POWER
Press to turn TV ON or OFF
CC
Press to access closed captions.
TV/FM
Press to alternate between
TV or FM operating mode
VOLUME
Press left to reduce or right to
increase volume level of TV.
NUMBERED BUTTONS
Press repeatedly to s elect
desired menu.
TIMER
Press to activate SLEEP TIMER.
PURPOSE
This installer’s remote control is designed to aid installers
in programming and setting up these TVs in lodging
facilities.
MUTE
Press to turn off sound while
picture remains. Press again
C
C
to restore sound.
FLSHBK
Press to ret u r n to la st TV
channel you were watching.
CHANNEL Up/Down
Press to select a TV channel by
going up/down thr ough channels
programmed in the TV memory .
ENTER
Press to view Channel/Time
or to remove any on-screen
display.
or
Display
menu
SELECT
Press during on-screen menu
operatio ns to select an option.
ADJUST (Left)
Press during on-screen menu
operations to adjust an option.
ADJUST (Right)
Press during on-screen menu
operations to adjust an option.
HEALTHView Series
HP602Z
124-00213-06
ALARM
Press to turn wake-up alarm
ON or OFF.
CH PREV
Displays on-screen, preprogrammed
directory of station and network
affiliations.
SR21A1-10CH - REMOTES
Page 17
INSTALLER’S PROGRAMMER - LT1500
Connecting the programmer to a TV set automatically
activates the programmer power-switching circuits.
MPI
Status
Indicator
Color
green
red
Blink pattern
slow
battery OK
battery low
Reset
Once connected, check the “Status Indicator” LED on
the programmer. If the indicator is green and flashing a
double-blink “heartbeat” pattern, proceed to next step.
Note: A slowly flashing green light indicates there is
a problem with communications between TV and
programmer. In this case, check for damaged cable,
poor contacts, or other connection problems. If status
indicator is red, the programmer batteries are low
and should be replaced. Use 4 good-quality alkaline
AA batteries.
If communications are good, the sign-on screen will be
displayed on the TV screen as shown on the quick setup
instructions that accompany the LT1500. If the intention
is to set TV or programmer real-time clocks, and not the
clone clock or TV clock time settings, then press a key
to proceed to main clone menu.
If a previously stored TV setup is in a particular clone
memory, it may be changed if desired by overwriting it
with a new setup. There is no need for a separate memory
clear operation.
Setups stored in programmer memory are nonvolatile and
will be retained even after a battery change.
CLONE SELECTION MENU CHOICES
QUICKSET II PROGRAMMER
The QuickSet II programmer (LT1500) allows custom
setup and programming information to be quickly copied
from a master TV into multiple television sets. Once
learned from the master, setup data is retained in the
LT1500 for future use and recall.
When using the LT1500, operation will be easier if the
TV is connected to a good-quality signal and operating
with a stable picture displayed. To operate the LT1500,
use indicated keys on an HP602 or LP702 installer’s
remote or MBR3447 user’s remote, or the front panel
keys on the TV receiver.
Begin programming process by setting up a master TV
set using one of the installer’s remotes or the MBR remote.
Set all features that will be customized including channel
scan list, channel labels, and installer menu setups. Follow
instructions in the operating guide for the specific
model TV.
Next, connect the LT1500 to the master TV set using
the cable provided with the programmer. Connect the
cable between the MPI jacks on the TV and programmer.
LEARN FROM TV
Select “Learn From TV” then press ON/OFF, POWER, or
ENTER to begin learning process.
Alternatively, use the TV front panel CHANNEL UP or
CHANNEL DOWN keys to highlight choice.
Press ON/OFF, POWER, or ENTER to activate.
The next screen will allow a choice of four available
memories to store this TV setup. With four memories
available, four different TV setups can be stored in the
LT1500.
Using the On-screen menu, choose a memory or choose
to return to the main selection menu; then press ON/
OFF, POWER or ENTER to activate your selection.
The next screen allows one last opportunity to check the
versions of TV and clone setups.
Press ON/OFF or POWER to activate learning cycle, or
press any other key to return to the selection menu to
make other choices.
Once a process has begun, the TV screen will display
“LEARNING IN PROGRESS”. Please wait for the process to
complete. When the TV screen displays “LEARNING
COMPLETED”, press any key to end the learning process
and return to the clone selection menu.
SR21A1-11CH - REMOTES
Page 18
INSTALLER’S PROGRAMMER - LT1500 (continued)
TEACH TO TV
Select “TEACH TO TV”, and then press ON/OFF, POWER,
or ENTER to begin teaching process.
Alternatively, use the TV front panel CHANNEL UP or
CHANNEL DOWN keys to highlight the choice, and then
press ON/OFF, POWER, or ENTER to activate.
The next screen displays a choice of the four available
memories that can be copied to the TV.
Select the desired memory number, and then press ON/
OFF, POWER or ENTER to begin the teaching process.
Alternatively, use the TV front panel CHANNEL UP or
CHANNEL DOWN keys to highlight your choice.
Then press ON/OFF, POWER, or ENTER to begin.
Using the on-screen menu, select a memory or return to
the main selection menu. Then press ON/OFF, POWER, or
ENTER to activate the selection.
The next screen allows for one last opportunity to check
the versions of TV and clone setups. Press ON/OFF or
POWER to activate the teaching cycle, or any other key
to return to the selection menu to make other choices.
Once a process has begun, the TV screen will display the
“TEACHING IN PROGRESS” message.
Please wait for the process to complete. When the TV
screen displays “TEACHING COMPLETED”, press any key
to end the teaching process and return to the clone
selection menu.
SET CLONE CLOCK FROM TV
To initially set the real-time clock in the LT1500 or update
the time, select “SET CLONE FROM TV” and then press
ON/OFF, POWER, or ENTER to copy current TV time to the
clone clock.
Alternatively, use the TV front panel CHANNEL UP or
CHANNEL DOWN keys to highlight the choice. Then press
ON/OFF, POWER, or ENTER to activate.
This process will return the LT1500 to the sign-on screen
to display the clone and TV clock settings. Press a key to
go to the clone selection menu and perform other
functions, or simply disconnect if time setting was the
last task.
DISPLAY TV SETUP
Select “DISPLAY TV SETUP”, and then press ON/OFF,
POWER, or ENTER to begin the teaching process.
Alternatively, use the TV front panel CHANNEL UP or
CHANNEL DOWN keys to highlight your choice. Then press
ON/OFF, POWER, or ENTER to activate.
The TV screen will display the items in the service menu
setups. Use this function to quickly check a TV for
correct setup. Press any key to clear display and return
to clone selection menu.
DISPLAY CLONE SETUP
Select “DISPLAY CLONE SETUP”, and then press ON/OFF,
POWER or ENTER to begin the teaching process.
Alternatively, use the TV front panel CHANNEL UP or
CHANNEL DOWN keys to highlight the choice, and then
press ON/OFF, POWER or ENTER to activate.
The TV screen will display the memory selection menu.
Select the desired memory number, and then press ON/
OFF, POWER, or ENTER to display contents of selected
memory. Alternatively, use the TV front panel CHANNEL
UP or CHANNEL DOWN keys to highlight the choice, then
press ON/OFF, POWER or ENTER to begin.
The TV screen will display items in the installer menu
setups. Use this function to quickly check contents of a
particular clone memory for correct setup.
Press any key to clear the display and return to the clone
selection menu.
OPERATION NOTES
Disconnect the LT1500 from the TV set when the desired
task has been completed. Disconnecting the clone
automatically switches it off. The real time clock
continues to run when the main circuits are switched
off.
After replacing exhausted batteries, or if the programmer
behaves strangely after a static shock, use a paper clip
or similar instrument inserted through the small hole
marked “RESET” to activate the internal reset switch and
restore normal operation. After reset, check the realtime clock setting. It may be necessary to reset the clock
from a TV programmed to the correct time.
Note: The LT1500 programmer is designed to be used
with TV sets containing the 221-1390 and later
microprocessors. Use with earlier TV sets may
give unpredictable results.
The specific microprocessor used in any TV set may be
determined by activating the service menu. The
microprocessor part number appears at the top of the
screen when the service menu is activated. Processors
before the 221-01390 have a limited screen display
capability. They cannot display entire screens as shown
in the quick setup instructions accompanying the LT1500
programmer. Use the printed menu illustrations on the
quick setup sheet as an aid to making programming
choices.
SR21A1-12CH - REMOTES
Page 19
USER MENUS 221-01390
INSTALLATION SETUP
Installer’s Remote and Clone Programmer
To perform the installation setup for several TVs, you
need an installer’s remote, such as the HP602Z (See 1-
10), and the LT1500 Clone Programmer (See 1-11). The
HP602Z Installer’s Remote allows access to the
Installer’s Menu, User Menus, and Source/Channel
Banks. The LT1500 Clone Programmer is used to
duplicate a TV’s setup and install it on one or more
additional TVs.
Press the POWER key on the Installer remote control to
turn on the TV.
SETUP MENU
Press the MENU key on the Installer’s remote repeatedly
so that the SETUP MENU appears on the screen.
SETUP MENU
AUTO PROGRAM TO PROGRAM
ADD/DEL/BL NK
CH. LABEL
TIMER SETUP
CLOCK SET
CAPTIONS/TEX T
LANGUAGE
Note: On some models, there are three jacks on the front
of the TV that make connecting Audio/Video devices
like Camcorders easy. To use the front jacks as the
signal source, simply plug a composite video cable
into the VIDEO jack. The TV will automatically
change its source setting to CAMPORT, as indicated
on the channel selection screen.
Press a
R
IGHT
or L
EFT
ADJ
arrow to begin the Channel Search.
The receiver searches for available channels and stores them
in memory for user access. Press
the
MENU
key on the remote until the SETUP MENU reappears.
ENTER
when finished. Press
ADD/DEL/BLNK
Press SELECT repeatedly to highlight the ADD/DEL/BLNK
option. Use the remote to select a channel. ADD/DELETE
allows tailoring of the channel scan to eliminate
unwanted channels and add desired channels that were
not stored during Auto Programming.
Use the number keypad and
Using the
R
IGHT/LEFT
ADJ
ENTER
to add a deleted
channel.
arrows, pick whether a channel is
Added, Deleted, or Blank. Blank is used by hospitals and
institutions to send music or informational messages to an
unused channel. When BLNK is selected, screen will be black
while audio continues.
Select any other channels to be changed, and when
finished, press ENTER to close the menu.
CH LABELS (Channel Labels)
Press the MENU key on the remote so that the SETUP
MENU reappears.
Use SELECT to choose the CH LABELS option.
AUTO PROGRAM
Using SELECT on the remote control, highlight AUTO
PROGRAM on the screen. Then press a RIGHT/LEFT ADJ
(Adjust) arrow button to reach the AUTO PROGRAM
screen.
Using
SELECT
, choose either CABLE TV or OFF-AIR ANTENNA
Pressing either the RIGHT/LEFT ADJ arrow repeatedly, pick
the label you want from the list of available selections
shown in the chart. Select other channels, and when
you are finished, press ENTER to remove the menu.
Note:Although the next item on the Setup Menu is
on your screen. (The flashing option is selected.)
Note:
Selecting the none option means the channel will not have a label.
Selecting this label option means the channel will not be displayed on the channel/time/audio signal display.
Timer Setup, the clock must be set first.
SR21A1-13CH - MENUS
Page 20
USER MENUS 221-01390 (continued)
TIMER SETUP
Press MENU to show the SETUP MENU. Use SELECT to
highlight TIMER SETUP.
With TIMER SETUP highlighted, use the RIGHT/LEFT ADJ
arrow to pick from the preset times, the time that the
TV will turn itself off, or set the SLEEP TIMER to Off to
disable it.
Press ENTER to set the timer and return to TV viewing.
OFF
Notes:
• Availability and functionality of the CAPTION/TEXT
features are determined only by each broadcaster and
may not be available in your area.
• CAPTIONS - The term for the words that scroll across
the bottom of the TV screen; usually the audio portion
of a program, provided for the hearing impaired.
• TEXT - The term for the words that appear in a large
black frame that almost covers the entire screen; usually
messages provided by the broadcaster.
Press the MENU key on the remote control to return to
the Setup menu.
LANGUAGE
Press SELECT on the remote control and repeat to
highlight LANGUAGE on your screen.
Press a RIGHT/LEFT ADJ arrow to choose one of the
following options: English, Spanish or French.
Press ENTER to return to TV viewing.
AUDIO MENU
Press MENU repeatedly on the remote control until the
AUDIO MENU appears.
The Sleep Timer may be instantly set by pressing the
TIMER key repeatedly. When you have made your
selection, press ENTERto set the Sleep Timer and return
to TV viewing.
CLOCK SET
Press MENU repeatedly to show the Setup menu. Use
SELECT to highlight Clock Set.
Set the current time; use the Number keypad to enter
the hours, then minutes. For example, enter 06, then
30, to set 6:30 on the clock. Use the TIMER key to
specify AM or PM.
Press ENTER to start the clock and return to TV viewing.
CAPTION/TEXT
Using SELECT on the remote control, select CAPTION/
TEXT on the screen.
Use the RIGHT/LEFT ADJ arrows to choose any of the
following options: CAPTION 1, CAPTION 2, CAPTION 3,
CAPTION 4, TEXT 1, TEXT 2, TEXT 3, or TEXT 4.
Press ENTER to close the menu.
Select CAPTIONS directly by pressing CC repeatedly to
choose OFF, CAPTION 1, 2, 3, 4 or TEXT 1, 2, 3, 4.
CAPTION/TEXT is a feature that allows the TV to receive
closed captions and/or text options when made available
by the broadcaster.
AUDIO MENU
BASS
TREBLE
BALANCE
AUDIO MODE STEREO
FRONT SURR OFF
SOUNDRITE OFF
Using SELECT on the remote control, highlight the
setting you want to change. Choose from:
•BASS: Adjusts the amount of Bass (low frequency
level) in the sound. Has 15 steps (0 to 14)
•TREBLE: Adjusts the amount of Treble (High
frequency Level) in the sound. Has 15 steps (0 to
14)
•BALANCE: Adjusts the balance of sound between the
left and right speakers. Has 15 steps (0 to 14).
•AUDIO MODE: Selects between stereo, Mono, Stereo
or 2nd Audio/SAP. If 2nd Audio/SAP is selected, but
current channels does not support SAP, then either
Stereo or Mono will be heard.
SR21A1-14CH - MENUS
Page 21
USER MENUS 221-01390 (continued)
•FRONT SURR: can be set ‘On’ or ‘Off’, regardless of
the current Audio Mode setting. However, the Front
Surround effect can only be heard when the Audio
Mode has been set to ‘Stereo’ and a Stereo signal is
present.
•SOUNDRITE: Used to obtain a uniform volume level,
particularly while changing channels. The SoundRite
feature can be best demonstrated on a channel with
no signal (snow).
Note: The Hospital chassis does not have the above listed
Audio Menu. Instead, it only has the option to turn
the speakers On or Off.
Press a RIGHT/LEFT ADJ arrow to adjust or change the
option you have selected.
Press ENTER to return to TV viewing, or press SELECT to
return to the Audio Menu to adjust another option.
VIDEO MENU
Press MENU repeatedly until the Video Menu appears.
VIDEO MENU
CONTRAST
BRIGHTNESS
COLOR
TINT
SHARPNESS
PICTURE PREF PRESET
Your options are:
• CONTRAST: Adjusts the contrast of the picture
(difference between white and black). Has 64 steps
(0 to 63).
• BRIGHTNESS: Adjusts the brightness of the picture
(amount of white). Has 64 steps (0 to 63).
• COLOR: Adjusts the intensity of the color. Has 64
steps (0 to 63).
• TINT: Adjusts the tint of the color picture (balances
between amounts of red and green in the TV picture).
Has 64 steps (0 to 63).
• PICTURE PREF: Has two settings; PRESET and CUSTOM.
In the Custom mode the brightness, contrast, color
and tint can be set to a users particular liking. The
preset settings brings up the factory setting for these
controls. Preset is selected automatically after an AC
power interrupt.
Use SELECT on the remote control to highlight the
setting you want to change.
Press a RIGHT/LEFT ADJ arrow to adjust or change the
option you have selected.
Press ENTER to return to TV viewing, or press SELECT to
return to the Video Menu.
PARENTAL CONTROL
This optional feature can be used to prevent (block)
unwanted programming from appearing on your TV.
PARENTAL CONTROL
AUX SOURCES
MPAA RATING
AGE BLOCK
CONTENT BLOCK
SET HOURS
SET PASSWORD
LOCK ON/OFF
SEX SCENES
PARENTAL CONTROL offers the user a wide variety of
options and settings that restrict or block programming
that can appear on the TV. PARENTAL CONTROL allows
users the capability of defining which program ratings
they consider acceptable to younger or more sensitive
viewers.
PARENTAL CONTROL can be preset and turned on or off
by a user who specifies the 4 number password. The
number of hours blocked may also be specified.
General audience and children viewer blocks can both
be programmed into the TV’s memory. Viewer ratings are
specified for both the TV industry and the motion picture
industry; both rating systems can be used. The ratings
are based mainly on children’s ages.
• SHARPNESS: Raises or lowers the definition of the TV
picture. The lower the level, the softer the images
will appear (adjusts the sharpness of the picture).
Has 64 steps (0 to 63).
SR21A1-15CH - MENUS
Page 22
USER MENUS 221-01390 (continued)
OVERVIEW
To ensure complete coverage for all TV programs (movies
and regular TV shows), choose ratings from the Motion
Picture Association of America (MPAA) Rating System
chart and the TV Parental Guidelines Rating System chart
(both shown below). Use the AGE BLOCK option for
General Audiences and for Children. You can also add
additional restrictions from the CONTENT BLOCK menu.
Things to Consider before Setting Up Parental Control:
Determine which ratings you consider acceptable for viewing.
(For example, if you choose TV-PG, all of the more restrictive
ratings will be blocked automatically:
able to see TV-PG, TV-14, or
TV-MA rated programming.)
the viewer will not be
Select whether auxiliary video sources will be blocked
in the AUX SOURCES block option. (Blocks signals from
VCRs, DVD players, etc. connected to the TV Audio/Video
input jacks). You could also leave AUX SOURCES
unblocked, and then choose allowable ratings.
In the CONTENT BLK option, you can block program
Content based on individual parameters such as Strong
MOTION PICTURE ASSOCIATION OF AMERICA (MPAA) RATING SYSTEM
Dialog, Bad Language, Sex Scenes, Violence Scenes, or
Fantasy Violence Scenes.
You can set PARENTAL CONTROL to be active in the SET
HOURS option for up to 12 hours.
Use the number keys on the remote to select a secret
password in the SET PASSWORD option. Don’t forget
the password, as it is the only way you can access the
PARENTAL CONTROL menu and change rating selections
or turn PARENTAL CONTROL off. If you do not want
PARENTAL CONTROL to be active all the time, you can turn
it on or off with the LOCK ON/OFF option.
Notes:
• You can set different PARENTAL CONTROL viewing re-
strictions for general audiences and for children - - both
can be active at the same time.
• Simply specifying one content block such as Sex Scenes,
will not automatically block another type of content in
the programs from appearing.
• Even if you choose to leave the AUX INPUTS unblocked,
the ratings you specify will automatically restrict the
programming that appears from the video sources.
GGeneral AudiencesContent not offensive to most viewers.
PGParental GuidanceContent is such that parents may not want their children to view the program.
Suggested
PG-13Parental GuidanceProgram is inappropriate for preteens, with a greater degree of offensive
Suggestedmaterial than a PG-rated program.
RRestricted viewingNot for children under age 17. Strong elements of sex and/or violence.
NC-17Restricted ViewingNot for children under age 17 under any circumstances. Strong sexual content.
XHard Core FilmsSame as NC-17 rating.
Note: Zenith Electronics Corporation is not liable for any program content that appears when using this rating system;
as always, user discretion is advised.
TV PARENTAL GUIDELINE RATING SYSTEM
GGeneral AudiencesContent not offensive to most viewers.
TV-GGeneral AudienceConsidered suitable for all audiences; children may watch unattended.
TV-PGParental GuidanceUnsuitable for younger children, may contain: Suggestive Dialog, Bad Language,
SuggestedSex, and Violence Scenes.
TV-14Parents StronglyUnsuitable for children under 14, may contain: Strong Dialog, Bad Language,
CautionedSex, and Violence Scenes.
TV-MAMature Audience OnlyAdults only, may contain: Strong Dialog, Bad Language, Sex, and Violence Scenes.
CHILDRENS’ CLASSIFICATIONS
TV-YChildrenConsidered suitable for all children under 7 years old.
TV-Y7Children 7 and overConsidered suitable for children over 7, may contain Fantasy Violence Scenes.
SR21A1-16CH - MENUS
Page 23
USER MENUS 221-01390 (continued)
• You cannot disable PARENTAL CONTROL by disconnecting
the TV from power. Block hours will automatically reset
to the original block time setting specified if power is
disconnected.
• To reset the password, use the installer’s remote control
to deactivate the V-Chip in the Installer’s menu (#53).
Exit out of the Installer’s Menu after deactivating the
Parental Control. Then enter back in and reactivate the
V-Chip.
With the PARENTAL CONTROL menu on-screen, use SELECT
to choose an option, such as CONTENT BLOCK. Use the
LEFT/RIGHT ADJ arrows to show the CONTENT BLOCK menu,
to adjust or set the rating for an option.
CHANNEL PREVIEW
NBC
2
NONE
3
PBS
4
5
NONE
CBS
6
7
ABC
NONE
8
NONE
9
NONE
10
CH / TO SELECT, ENTER TO QUIT
CC FOR PARENTAL CONTROL
To block sex scenes, for example, use the “TV-PG and
above” setting. To block dialog, use LEFT/RIGHT ADJ
arrows to select among UNBLOCKED, TV-PG and above,
or TV-14.
(See the Ratings Charts for rating meanings.)
After you have selected and adjusted the PARENTAL
CONTROL menu options to your preferences:
- Set the number of hours Parental Control will be on.
- Set a 4 number password.
- Set the Lock On/Off option to either on or off.
Note: Some broadcasts do not include ratings information.
Channel/Time/Audio Display
Press ENTER. Shows currently selected channel or source,
current time if the clock has been set, and incoming
audio signal.
ALARM MENU
Press ALARM. Sets the time the wake up alarm will sound.
CH PREVIEW MENU
Press CH PREVIEW. Displays list of the available TV
Channels, Guest Parental Control menu (if active) and
Video Channel access.
CAPTIONS DISPLAY
Press CC. Sets Caption/Text options: Off, Caption 1, 2,
3, 4 or Text 1, 2.
cc
CAPTIONS
OFF
RADIO FEATURE
Pressing the TV/FM key allows the customer to listen
the Radio.
The Auto Program feature automatically searches for all
available Radio Stations and marks them as ‘added’ so
that they may be accessed via the channel Up/Down
key.
Press CHANNEL UP/DOWN to select a channel, or menu,
then ENTER to go to channel or menu.
Pressing CC will activate the Parental Control menu.
SR21A1-17CH - MENUS
Page 24
USER MENUS 221-01390 (continued)
In the Auto Program screen:
•A message at the top displays “Auto Program” to let
the customer know that they have entered the Auto
Program feature.
•Up/Down and Left/Right Arrow keys are used for Auto
Program selections.
•The current RF input type (Off Air Antenna or Cable
TV) is highlighted. Use the Up/Down Arrow keys to
change the RF input type.
To start the Auto Program, press the Left/Right Arrow
key.
SETUP MENU
AUTO PROGRAM
FM ADD/DEL
FM LABEL
TIMER SETUP
CLOCK SET
TO PROGRAM
FM LABELS
Use FM Label to assign a label for the type of radio
station shown in the Music ID display. For example, if
the label ROCK is assigned to FM station 100.9, then
ROCK will appear in the active stations list next to FM
100.9, whenever the Music ID display is shown. Labels
available (besides Blank) include:
CLAS =ClassicalOTHE = Other
COUN =CountryRELI = Religon
JAZZ =JazzROCK = Rock
NEWS =NewsSPOR = Sports
OLDI =OldiesTALK = Talk
MUSIC ID
101.9 RELIGOUS
101.7 COUNTRY
101.3 CLASSICAL
101.1 NEWS
100.9 ROCK
100.7 OLDIES
100.5 JAZZ
100.3 TALK
99.9 SPORTS
Note: While searching for radio stations, all keys except
the Power key are disabled. This prevents an
incomplete Auto Program procedure. Running the
Auto Program will clear the factory mode, if it was
active. This happens at the end of the Auto Program.
If no radio stations are found, then the following
message will appear: “Make sure that the antenna
is connected, and try again”.
FM ADD/DEL
Allows tailoring of the station scan results to eliminate
weak and unwanted stations. Use FM ADD/DELETE to
get rid of unwanted stations or to program back in a
previously deleted station.
Note: After using the FM Add/Del function, return to TV
mode (press TV/FM key) before turning the TV off.
This ensures that the FM Add/Del changes are saved
in memory.
CH / TO SELECT ENTER TO QUIT
TIMER SETUP
Turns on the FM Radio’s Sleep Timer menu. Select TIMER
SETUP, then press RIGHT/LEFT ADJ to choose the time
the FM radio is to remain on before it turns off. Choose
from 15 minutes to 4 hours. Once the turn off time has
been selected, press ENTER to activate the timer and
close the menu.
CLOCK SET
Sets the clock in the receiver.
Note: If clock had been set in the TV menu mode,
there is no need to set it in the radio mode.
SR21A1-18CH - MENUS
Page 25
USER MENUS 221-01390 (continued)
AUDIO MENU FOR RADIO
Use to adjust the sound options to your preferences.
The display shows either Mono, Stereo or Muted.
Mono sets will only show the option to turn the speakers
On or Off.
RADIO SCREEN SAVER
When the customer is done with setup, the radio screen
saver turns on. The radio screen saver displays the Radio
station, the audio mode, and the time as seen below.
104.1 MONO
10:56 PM
PLANNING THE CHANNEL BANKS
Generally, TV channels are grouped into “program
packages” with terms that are proposed to the end user.
The user then opts for a package. Below is an example
of how TV channels may be grouped.
Channel BankProgram package
1Basic cable channels
2Extended cable channels
3Extended with premium channels
4Other cable service options
Sometimes only one or two channel banks may be needed.
You may leave any unused bank with the channels.
However, you may want to leave at least one channel in
any unused bank. Then, if someone selects an unused
bank, that channel will assure them that the TV is
functional.
Note: Some channels left over from factory testing
may still be in the channel banks if you have
not yet run Auto Program.
ADDING/DELETING CHANNELS
A previously prepared programming chart is helpful.
This display is also scrolling down. Once the display
reaches the bottom, it starts back at the top and keeps
scrolling down. This scrolling occurs until the Menu key
or the down arrow is pressed.
CHANNEL BANK
Allows to choose between one of 4 channel banks.
Press SOURCE to change between banks.
BANK 1
1. Run AUTO PROGRAM (in the SETUP MENU). The
channels available at your cable/antenna will be
entered in all channel banks (1, 2, 3 and 4).
Notes:
• Channels previously blanked will be cleared; channels
entered that are not currently available will be deleted.
• The Blank Channel feature is global. A channel will be
blanked in all channel banks.
2. Select a channel bank with a remote press SOURCE/
BANK (and repeat). The Channel BANK and BANK
number will be displayed.
3. Use the ADD/DEL/BLNK option (also in the SETUP
MENU) to customize your program package. You may
delete channels or add some that have not been
entered. You can also Blank a channel to
accommodate an audio-only program source or for
in-house communication. The ADD/DEL/BLNK option
has more details.
4. Repeat steps 2 and 3 to program another channel
bank.
It is best to do ADD/DEL customizing before doing
BLANKING. ADD and DEL (not BLNK) can be used
independently for channel banks 1, 2, 3, and 4).
SR21A1-19CH - MENUS
Page 26
Page 27
SECTION 2
INSTALLERS MENU 221-01390
INSTALLERS MENU ADJUSTMENTS
To access the Installer’s Menu, press and hold the MENU
key until the User Menu display disappears, then press
9876, and then ENTER to access the Installer’s Menu.
00 FACT MENU
01 PRESET PX: Stores customer menu adjustments in
the nonvolatile memory of the EAROM. Selections are
Custom and Preset-Store. Settings for Contrast,
Brightness, Color and Tint are stored in this manner. 0
is custom and 1 is Preset stored.
1
The black bar near the top of the screen indicates the
part number of the software in the TV set. To the right
is a number indicating that the module has been tested.
The date on the black bar near the bottom of the screen
indicates the date the module went through the factory.
When the Installer’s menu appears, it displays the fourth
Service Menu item: VERT POS. Use the SELECT UP/DOWN
keys to toggle through all of the adjustments. Use
ADJUST to make a change to the selected item.
00 FACT MENU: Use SELECT UP and DOWN Keys to select
item 00, the Factory Mode. This item is used by the
Factory when the module is being tested. It has two
positions: 0 and 1. In the field, this item should always
be left off (Zero is off).
When this item is off, only the first twenty-three items
in the Installer’s Menu can be accessed. They appear
one at a time near the middle left of the screen. When
this item is set to 1, 54 menu items are available.
In the Factory Menu, only the selected menu item is
displayed, near the top of the screen, as shown in the
figure.
When the Factory Menu is on, the AC Power-On feature
is always enabled regardless of the setting of AC ON in
the Installer’s Menu. The TV set will automatically come
on when AC is applied.
Use the remote to reenter the Installer’s Menu to turn
the Factory Menu off. The Factory Mode may also be
turned off by setting the clock, or running the Auto
Program feature in the customer Set Up menu.
02 POWER MANAGE: Range is 0-7. 1-7 is the length of
time (in hours) that the set will continue to operate if
unattended. When the set nears turnoff time, an onscreen message appears telling you to press any key to
continue normal viewing. When set to 0, this feature is
inactive.
03 VERT P0S: Moves On-Screen Displays vertically. The
Range is from 0-25. This adjustment is generally set at 5.
04 H0RZ POS: Moves On-Screen Displays horizontally.
Range is from 1-15. Generally set at 9.
05 BAND/AFC: There are eight positions:
0 is Broadcast fixed4 is Broadcast afc
1 is CATV afc5 is CATV fixed
2 is HRC afc6 is HRC fixed
3 is ICC afc7 is ICC fixed
06 MIN VOLUME: Allows adjustment of minimum volume
level. Range is 0-63. When this item is set to 0, the
sound level can be adjusted down to zero.
07 MAX VOLUME: Allows the adjustment of maximum
volume level. Range is 0-63. When this item is set to
63, the set has full adjustment capability.
08 AC ON: Has two positions; 0 is off, and 1 is on. In
ON position, the TV set will turn on and off when AC
power is applied.
09 KEY DEFEAT: Disables unmarked menu buttons on
the TV’s control panel. Range is 0-1. 0 is off and 1 is
on. Set to 1 (On) to turn the keys off.
SR21A2-1CH-INSTALLERS MENU
Page 28
INSTALLERS MENU 221-01390 (continued)
10 STRT CH/VOL: Determines the channel that is selected
automatically each time the TV is turned on and sets
the audio volume level at turn-on. Range is 0-255. 0 is
the Aux position and 255 is Off. Use ADJUST to change
the channel number. START VOLUME is to be set before
setting the start channel. Use the volume control to set
the volume level.
11 HOSPITAL MODE: Range is 0-2. 0 is off. 1 is Hospital
Bed 1 using Zenith Private Label IR Codes 21 or 121. 2
is Hospital Bed 2 using Zenith IR Codes 1 or 101. When
item 22 (Feature Level) and HOSPITAL MODE are set to
0, Private Label is activated.
12 CHAN LOCK: Defeats tuning operations. Range is
0-1.
0 is Off and 1 is On. Use the START channel to lock
on a particular channel.
13 GHOST CH: Ghost channel when item #11 is set to
zero. Zero is off and 1 is on. When on, the channel
number will stay on screen at all times, unless captions
are present. The number moves slightly to prevent damage
to the screen. If captions are on, ghost channel will
not be present.
14 SCAN MODE: Range is 0-3. The sets turn off when
channel scan buttons are being used. In 0 mode, scan
off is inoperative. In position 1, the set will turn off
between auxiliary and lowest channel. In position 2,
the set will turn off between auxiliary and FM. In
position 3, the set turns off after an FM station scan.
Scan Mode Characteristics
19 OLD OCV: (On Command Video) Zero is off, one is
on. Set to one for operation with “Spectramate” systems
from On Command Corporation.
20 CAPTION LOCK: Zero is off, 1 is on. Set to 1 for
operation to restore previous on/off state after TV is
initially turned on.
21 FUNCTION PRE: (Function Menu Channel Preview)
Range is 0-1. Zero is off and one is on. Set to 1 to
suppress channel preview screen in the function menu
with some pay per view systems.
22 FEATURE LEVEL: Range is 0-1. Zero is Zenith Private
Label and one is Zenith. When item 11 (Hospital Mode)
and FEATURE LEVEL are set to 0, Private Label is activated.
23 TRAP 3.58: Zero is off, one is on. Set to 1 for normal
TV operation. Set to 0 if Y/C is used or chassis has a
comb filter.
24 RF BAND PASS: Sets adjustment range of the customer
control for brightness in therefore mode. Range is 0-1.
Set to 1.
25 RF BRT: (RF brightness) Sets adjustment range of
customer control for brightness in RF mode. Range is
0-63. A typical value is 30.
26 AUX BRT: (Auxiliary Brightness) Sets adjustment range
of the customer control for brightness in AUX mode.
Range is 0-63. Typical value is 30.
27 MAX CONTRAST: Sets adjustment range of customer
control for contrast. Range is 0-63. Typical value is 63.
0AUX, TV, VCR3, VCR4
1AUX, TV, VCR3, VCR4, ON/OFF
2AUX, TV, VCR3, VCR4, FM
3AUX, TV, VCR3, VCR4, FM, ON/OFF
15 TEXT MODE: Turns text mode on or off in the users
menu. Range is
0-1.
Zero is off and one is on. In on
mode, user can call up text mode. Set to 0 unless text is
being used.
16 SLEEP TIMER: Enables sleep timer feature. Range is
0-1. Zero is off and 1 is on.
17 ALARM: Enables Alarm feature. Range is 0-1. Zero is
off and one is on.
18 CH OVER RIDE: Zero is off, one is on. In on mode,
the TV works normally. This item is generally set to off
so it can be controlled with entertainment unit. In off
mode; Auto Program and Channel Add/Delete do not
function.
28 VERT SIZE: (Vertical Size) Range is 0-254.
29 HORZ SIZE: (Horizontal Size) Range is 0-254.
30 VERT PHASE: (Vertical Phase) Range is 0-7.
31 HORZ PHASE: (Horizontal Phase) Range is from 0-
31.
32 AUD LEVEL: Sound Attenuation range is 0-63.
33 RF AGC: (Rf Automatic Gain Control) Range is from
0-63. 48 is a general setting. Tune in weakest available
channel and adjust for a snow- free picture.
34 HORZ AFC: Range is 0-1. Set to 0. 0=AFC2 Normal.
1=AFC2 X 3.
35 WHITE COMPRESS: (White Compression) The range is
0 to 1. Set to 0. 0 = Enable and 1 = Disable.
36 60HZ SW: (60 Hertz Switched) The range is 0 to 2.
32 MAX CONTRAST: Sets adjustment range of customer
control for contrast. Range is from 0-63. Set to 63.
SR21A2-2CH-INSTALLERS MENU
Page 29
INSTALLERS MENU 221-01390 (continued)
33 60HZ SW: A sync stability item. Range is 0-1.
Zero is off. Set to 0.
34 PIF VCO: Range is 0-127.
35 WHITE COMP: 0 is off, 1 is on.
36 60HZ SW: Range is 0-2.
37 PIF VCO: Range is 0-127.
Items 38 through 42 vary with CRT*
38 RED CUT: B&W tracking adjustment. Range is
0 to 255. Typical value is 20.
39 GREEN CUT: B&W tracking adjustment. Range is 0-
255. Typical value is 0.
40 BLUE CUT: B&W tracking adjustment. Range is
0-255. Typical value is 28.
41 GREEN GAIN: B&W tracking adjustment. Range is
0-255. Typical value is 45.
42 BLUE GAIN: B&W tracking adjustment. Range is
0-254. Typical value is 70.
43 6 KEY SYSTEM: Keyboard type. Set to 1 for 6 key
and 0 for 10 key.
45 STEREO VCO: (Stereo Voltage-Controlled Oscillator)
range is 0-63. Typical value range 10-39.
46 A FILTER: (Second Audio Program Voltage-Controlled
Oscillator) Stereo, SAP, and dBx filter adjustment. Range
is from 0-63.
47 A SPECTRL: Adjustment of stereo seperation (3kHz).
Range is 0-63.
48 WIDE BAND: Adjustment of stereo seperation
(300kHz). Range is 0-63.
49 MAX BLK HRS: Maximum amount of hours before the
Parental Control password expires. Range is 0-99.
50 STEREO: Enables stereo circuitry if present. Range is
0-1.
51 RADIO: Enables Radio circuitry if present. Range is 0-
1.
52 AUX: Enables Aux. Sources. Range is 0-1.
53 V-CHIP: Enables Parental Control. Range is 0-1.
*Adjust only if CRT has been changed. The “CUT”
adjustments affect the Lowlights and the “GAIN”
adjustments affect the Highlights.
00 FACT MENU0-100000Factory mode - refer to page 2-1
01 PRESET PX0-111111Used to store customer menu adjustments
02 POWER MANAGE 0-700000Hours TV will operate if not attended
03 VERT. POS0-301515151515Moves On Screen display vertically
04 HORZ POS0-4599999Moves On Screen display horizontally
05 BAND/AFC0-700000Broadcast Band adjustment
06 MIN VOLUME0-6300000Sets min. customer volume level
07 MAX VOLUME0-636363636363Sets max. customer volume level
08 AC ON0-100000AC power feature
09 KEY DEFEAT0-111111Disables control panel
10 STRT CH/VOL0-255255255255255255Determines channel/volume at turn on
11 HOSPITAL MODE 0-200020Remote control frequency level
12 CHAN LOCK0-100000Defeats tuning operation
13 GHOST CH0-100000In On mode, channel # will stay on screen
14 SCAN MODE0-300010Channel number On/Off
15 TEXT MODE0-111111Turns Text mode on or off in user menu
16 SLEEP TIMER0-111111Enables Sleep Timer feature
17 ALARM0-111101Enables Alarm feature
18 CH. OVER RIDE0-111111Channel scan advanced features
19 OLD OCV0-100000Y/C comb filter On/Off
20 CAPTION LOCK0-100000Affects captioning
21 FUNCTION PRE0-100000Function Menu Channel preview
22 FEATURE LEVEL0-111111Selects Zenith or private label
TECHNICAL SETTINGS (Black) Factory Mode 1
23 TRAP 3.580-1000003.58 Mhz trap
24 RF BANDPASS0-111111Brightness for therefore mode
25 RFBRT0-63303 0303030Brightness for RF mode
26 AUXBRT0-633030303030Brightness for AUX mode
27 MAX CONTRAST0-636363636363Sets customer control for contrast
28 VSIZE0-254163163163163155Vertical size
29 HSIZE0-254100100100100100Horizontal size
30 VERT PHASE0-722222Shifts picture vertically
31 HORZ PHASE0-31111111 1111Shifts picture horizontally
32 AUDLVL0-634646464646Audio level control
33 RF AGC 0-63464646 4646Weak channel adjustment
34 HOR AFC0-111111Horizontal Automatic Frquency control
35 WHITE COMPRESS 0-100000White compression
36 60HZSW0-22222260 Hertz Switched
37 PIFVCO1-1275252525252PIF Voltage Controlled Oscillator
38 RED CUT0-25500000B&W tracking adjustment
39 GREEN CUT0-25500000B&W tracking adjustment
40 BLUE CUT0-25511111B&W tracking adjustment
41 GREEN GAIN0-2548080808080B&W tracking adjustment
42 BLUE GAIN0-2549090909090B&W tracking adjustment
43 6 KEYS0-600000Keyboard Type
44 A ATT0-1599999Low frequency separation
45 STEREO VCO0-633131313131Stereo Voltage controlled Oscillator
46 A FILTER0-6331313131312nd Audio voltage controlled Oscillator
47 A SPECTRL 0-633131313131Stereo low pass filter
48 WIDE BAND0-6331313131312nd Audio program low pass filt
49 MAX BLK HRS0-99121212 1212Max Blank Hours
50 STEREO0-100100Enables Stereo
51 RADIO0-100110Enables Radio
52 AUX0-111101Enables auxiliary sources
53 V-CHIP0-111111Enables parental control
00 FACT MENU0-100000Factory mode - refer to page 2-1
01 PRESET PX0-111111Used to store customer menu adjustments
02 POWER MANAGE 0-700000Hours TV will operate if not attended
03 VERT. POS0-301515151515Moves On Screen display vertically
04 HORZ POS0-4599999Moves On Screen display horizontally
05 BAND/AFC0-700000Broadcast Band adjustment
06 MIN VOLUME0-6300000Sets min. customer volume level
07 MAX VOLUME0-636363636363Sets max. customer volume level
08 AC ON0-100000AC power feature
09 KEY DEFEAT0-111111Disables control panel
10 STRT CH/VOL0-255255255255255255Determines channel/volume at turn on
11 HOSPITAL MODE 0-200000Remote control frequency level
12 CHAN LOCK0-100000Defeats tuning operation
13 GHOST CH0-100000In On mode, channel # will stay on screen
14 SCAN MODE0-300000Channel number On/Off
15 TEXT MODE0-111111Turns Text mode on or off in user menu
16 SLEEP TIMER0-111111Enables Sleep Timer feature
17 ALARM0-111111Enables Alarm feature
18 CH. OVER RIDE0-111111Channel scan advanced features
19 OLD OCV0-100000Y/C co mb filter On/Off
20 CAPTION LOCK0-100000Affects captioning
21 FUNCTION PRE0-100000Function Menu Channel preview
22 FEATURE LEVEL0-111111Selects Zenith or private label
TECHNICAL SETTINGS (Black) Factory Mode 1
23 TRAP 3.580-1000113.58 Mhz trap
24 RF BANDPASS0-111111Brightness for therefore mode
25 RFBRT0-63303 0303030Brightness for RF mode
26 AUXBRT0-633030303030Brightness for AUX mode
27 MAX CONTRAST0-636363636363Sets customer control for contrast
28 VSIZE0-254155155145106139Vertical size
29 HSIZE0-254100100213124146Horizontal size
30 VERT PHASE0-7223324Shifts picture vertically
31 HORZ PHASE0-311111131210Shifts picture horizontally
32 AUDLVL0-634646464646Audio level control
33 RF AGC 0-634646464646Weak channel adjustment
34 HOR AFC0-111111Horizontal Automatic Frquency control
35 WHITE COMPRESS 0-100000White compression
36 60HZSW0-22222260 Hertz Switched
37 PIFVCO1-1275252525252PIF Voltage Controlled Oscillator
38 RED CUT0-25500000B&W tracking adjustment
39 GREEN CUT0-25500000B&W tracking adjustment
40 BLUE CUT0-25511111B&W tracking adjustment
41 GREEN GAIN0-2548080808080B&W tracking adjustment
42 BLUE GAIN0-2549090909090B&W tracking adjustment
43 6 KEYS0-600000Keyboard Type
44 A ATT0-1599999Low frequency separation
45 STEREO VCO0-633131313131Stereo Voltage controlled Oscillator
46 A FILTER0-6331313131312nd Audio voltage controlled Oscillator
47 A SPECTRL 0-633131313131Stereo low pass filter
48 WIDE BAND0-6331313131312nd Audio program low pass filt
49 MAX BLK HRS0-991212121212Max Blank Hours
50 STEREO0-101111Enables Stereo
51 RADIO0-101000Enables Radio
52 AUX0-111111Enables auxiliary sources
53 V-CHIP0-111111Enables parental control
SR21A2-5CH-INSTALLERS MENU
Page 32
Page 33
SECTION 3
SERVICING
GENERAL INFORMATION
Servicing the CH chassis is the same as with other Zenith
single-board chassis. If the set is dead, first check the
standby and switched voltages. If the switched voltages
do not appear, check the power “On” circuit. If the power
supply is OK and the set will turn On, the Horizontal
sweep circuit should be checked next. Is horizontal drive
available from the video processor chip? If the sweep
system does not start up, sweep-derived voltages will
not be generated.
If the sweep and high-voltage circuits are OK and video
or audio are missing, then the audio/video/tuner circuits
should be checked. If the receiver is working but some
feature is not working, check the Service Menu. Bring up
the Service menu and check to be sure that all items are
set correctly.
COMPONENT-LEVEL SERVICING
The following troubleshooting information is intended
for component servicing on the 19" through 27" models.
Replacement modules are available on an exchange basis
for the 32" and 36" models.
5 VDC at C3802
Power On at IC6000 pin 32
Check the following:
Keyboard input at IC6000 pin 7 and 8
IR input at IC6000 pin 15
Power On output at IC6000 pin 32
Q3802 power supply “turn On” transistor.
Check the Switches voltages:
+ 15 volts DC at CX3804
+ 15 volts DC for the Audio Amp at LX3805.
+9 volts DC C3806
SWEEP DERIVE VOLTAGES
+ 25 VOLTS dc AT (+) CX2105
+ 35 volts DC at the junction of CX3253 and DX3252
+ 215 VOLTS DC at the junction of CX3208 and RX3208
+ 33 volts DC at the junction of RX3216 and ZD6001
If the CRT or Video processor IC are replaced, Black/
White tracking must be reset. Refer to the Service Menus
section of this book for Black/White tracking
adjustments.
When troubleshooting video circuits, remember that all
video travels through the PIP IC (if used) and the Video/
Audio switcher IC. A defect in either of these IC’s can
result in no video.
WARNING!
DO NOT disconnect the Video output module from the
CRT when troubleshooting 32” and 36” receivers. If
the video output module is removed on these sets while
power is ON, the CRT will arc and can be permanently
damaged. Also, the technician is in danger of serious
shock. There is a termination circuit (R5110) on the
CRT module to prevent this from happening.
SERVICING THE POWER SUPPLY
Check the standby voltages first:
VDC at CX3407 ((usually 169.7 VDC when 120 VCA)
B+ at CX3610
NOTE: B + 130 VDC for CH 32 and 36 inch
CRT FILAMENT
Check at pin 1 and 2 of connector 2F5. This should
read voltages between 6.1 to 6.3 volts AC on a true RMS
meter.
VIDEO PROCESSOR ICX2200
Check the following key operating Signals and voltages:
Luminance in at ICX2200 pin 45
Chroma in at ICX2200 pin 45
Horizontal drive at pin 32
Vertical drive pin 24
R Out 19
G Out 20
B Out 21
Serial Data, Serial Clock pins 27 and 28
VCC 9 volts pins 9,46,8,48
R in form micro (IC6000) at pin 15
G in from micro (IC6000) at pin 16
B in from micro (IC6000) at pin 17
+ 15 VDC at CX3800
+14 VDC at C3803
SR21A3-1CH - SERVICING
Page 34
SERVICING
MICROPROCESSOR
Check the following:
IR in on pin 15.
+ 5 volts on pin 27 and 18.
Serial Data, Serial Clock on pins 36 and 38
Reset pin 30.
Horiz. Flyback pin 1, Vertical puce on pin 2
R Out 52, G Out 51, B Out 50.
VERTICAL CIRCUIT ICX2100
Check the following:
Vertical drive ramp pin 3
Vertical out pin 1
+ 25 VDC at pin 10
HORIZONTAL CIRCUIT
Check the following:
Horizontal drive to base of Q3201 predriver.
Driver transformer output at base of QX3203.
Shutdown voltage at RX3010M.
Scan derived voltages + 25V,+ 35V, + 215V +33V.
HIGH VOLTAGE AND X RADIATION PROTECTION
A potential source of x-rays is the picture tube, if the
high voltage (HV) is out of specification. When the HV
is operating properly, there is no x-radiation. For the CH
chassis family, the HV has no adjustments. A HV
shutdown circuit is used to prevent excessive HV and
x-ray emissions.
THEORY OF OPERATION (SHUTDOWN CIRCUIT)
This circuit basically monitors the sweep pulse voltage
derived from the sweep transformer TX3204 pins 5 & 6.
This voltage is rectified, and applied to a 12V zener diode
ZDX3004. When the HV reaches its maximum allowed,
value (see drawing) the zener diode conducts, the voltage
on pin 29 of the video processor (ICX2200) increases
until it reaches the threshold voltage of 3.5 VDC, and
shuts down the TV
If the shutdown circuit has operated, the microcontroller
will prevent the TV from being turned on again, without
first having to unplug the AC cord to reset the
microcontroller.
Apply signal through the video generator or tune the TV
color receiver to crosshatch pattern. Connect an accurate
HV meter between the picture tube anode and chassis
ground. Access Video Menu and adjust Brightness and
Contrast controls for minimum screen luminance. Wait
until, the Video Menu or display disappear. Read HV meter.
SR21A3-2CH - SERVICING
Page 35
SERVICE ADJUSTMENTS
G2 ADJUSTMENT
Use the following procedure when resetting G2.
1. Set brightness and contrast in Video Menu to mid
range.
2. Set color level to minimum.
3. Connect output of an NTSC generator to the antenna
input on the receiver. Select a color bar signal and
turn chroma off.
4. Adjust G2 control so that bar patterns range from
completely black to a “not overdriven” (not saturated) white. There should also be a distinct difference between black and white bars. Different shades
of gray should also be distinguishable if the G2 is
set correctly.
5. Return color level control to its normal setting.
Leave generator connected if RGB cutoff is to be
adjusted.
ADJUSTMENT OF RGB CUTOFF
Note: The G2 control must be adjusted before RGB
drive!
1.
If main module or CRT have been replaced, set
Service Menu items 41G Gain and 42 B Gain to default
settings for the receiver’s screen size.
2. Set color level to minimum and Tint to midrange.
3. Connect output of an NTSC generator to the antenna
input of the receiver. Set the generator output to
apure white signal, chroma off.
4. Access Service Menu cutoff adjustments. (Factory
mode item 00 must be set to 1 to gain access to
adjustments).
5. Set menu items 38 R Cut, 39 G Cut, and 40 B Cut to
0. These are the cutoff values.
6. Carefully observe which color is predominant on the
CRT screen. DO NOT change the cutoff control for
cutoff controls for best white screen display.
7. Set the NTSC generator to a color bar signal and
turn chroma off. Check that the TV set displays a
good gray scale from black to white. If black level
istoo high, readjust G2 slightly.
8. Return color level control to normal.
IF AND AUDIO SERVICING
VIDEO DETECTOR
If there is no viewable picture on screen, access the
Service Menu and check default settings for the
following items:
#33 RF AGC should be at least 40.
#37 PIF VCO Set to 63.
Tune in a good off-the-air signal. Place a high-impedance
voltmeter at pin 44 of ICX2200. Adjust item PIF VCO
(#37) to 2.5 volts DC.
AGC DELAY
With a strong noise-free antenna signal, adjust RF AGC
(#33) to a lower setting until the signal gets noisier.
Increase the setting again for a noise-free picture.
Note: If the setting is too high above 50, the tuner
input will overload. Under certain conditions,
beats may also appear in the picture.
MTS STEREO DECODER ALIGNMENT
The purpose of this procedure is adjusting registers of
SONY audio processor CXA2054S (IC1400).
If no audio is present, access the Service Menu and check
the default setting for the following items:
#32 AUDIO LEVEL set to 46.
Tune in a strong off air signal.
Place a high impedance meter on pin 54 of ICX2200 or
from + side of capacitor C1214. Adjust L1205 for 4 volts
DC.
Note: Alignment should be accomplished at least five
minutes after the set has been turned on.
STEREO LEVEL ADJUSTMENT
1. Apply an RF signal with good video and audio at
400Hz and 100% modulation.
2.Access item #32 AUDIO LEVEL on the Installer’s Menu.
3. Place a high impedance meter on pin 19 of IC1400
or the positive side of capacitor C1427. Adjust item
AUDIO LEVEL (#32) to 490 to 500mV AC.
4. Access item #44 A ATT on the Service Menu. Place a
high impedance meter on pin 44 of IC1400. Adjust
item A ATT (#44) to 490 to 500mV AC.
MTS MODELS: Enter settings in their appropriate locations
in the Service Menu, items 44-48, (starting with the left
most two digits for item 44).
Note: Items 44-48 have no effect on MONO models. Do
not change default settings.
SR21A3-3CH - SERVICING
Page 36
SERVICE ADJUSTMENTS
PURITY & CONVERGENCE SETUP PROCEDURE
PRELIMINARY SETUP
1. Allow the receiver to warm up for 15 to 20 minutes.
2. Degauss the CRT.
3. Connect a crosshatch generator to the receiver and
“rough in” the static (center) convergence. Follow
the Convergence Procedure.
4. Adjust for best focus.
PURITY ADJUSTMENT
1. Purity tab positioning. Set the 2 pole purity tabs
together in the 3 or 9 o’clock positions and the 4and 6-pole purity tabs together in the 12 or 6 o’clock
positions.
2. Move yoke to the maximum forward funnel position.
3. Next, switch the crosshatch generator to a red field.
4. Pull the yoke toward the rear of the CRT neck, keeping
it centered, until a red raster is displayed.
5. If the red raster is not displayed as a pure red field,
adjust the 2-pole purity tabs until a pure field is
obtained.
CONVERGENCE ADJUSTMENT
1. Release locking assembly.
2. Connect crosshatch generator to the receiver and
adjust static (center) convergence as follows:
a. Adjust the 4-pole static control by moving the
two tabs separately to converge the red and blue
lines horizontally. Move the two tabs together
around the neck of the CRT (in a 45° arc) from the
top-dead-center position to converge the red and
blue lines vertically.
b. After the 4-pole control has been adjusted to
superimpose the red and blue lines on top of one
another. Use the 6-pole static adjustment to place
the converged red and blue lines over the green
line. Move the two tabs together around the neck
of the CRT (in a 30° arc) from the top-dead-center
position to move the lines vertically. Adjusting the
two tabs separately will move the converged beam
to the left or right. Using a crosshatch generator
capable of producing individual fields, adjust the
generator to produce a red field. Use the purity
tabs to center a red stripe.
6. Check for proper yoke tilt setting.
Wedges’ Adhes ive Tape (3)
Deflection Yoke
Purity & Convergence
Magnet Assembly Unit
4 Pole
Yoke’s Glass Cloth Tape
Rubber Wedges (3)
6 Pole
Purity Magnet
CRT Ring Location Purity
Adjust Tabs Beam Movement
for Convergence
Ring
Pairs
6 Pole
Convergence
R&B over G
4 Pole
Convergence
R over B
Rotation direction
of Both Tabs
Opposite
Same
Opposite
Same
Movement of Red
and Blue Beams
BB
OR
RR
B
B
OR
R
B
OR
R
OR
B
R
B
R
R
BR
SR21A3-4CH - SERVICING
Page 37
SERVICE ADJUSTMENTS (continued)
VERTICAL-TILT WEDGE ADJUSTMENT
The vertical lines at 6 and 12 o’clock are converged by
vertically tilting the yoke and inserting a wedge at the
top of the yoke until it is firmly seated between the CRT
glass and the horizontal coils.
HORIZONTAL-TILT WEDGE ADJUSTMENT
The vertical lines at 3 o’clock and 9 o’clock are converged
by horizontally tilting the yoke and inserting a wedge.
Adjust first at 4 or 8 o’clock, whichever has the larger
space, until the wedge is firmly seated between the CRT
glass and yoke coils. Then, insert the 3rd wedge in the
remaining horizontal tilt position until it is firmly seated
between the CRT glass and yoke coils. Convergence at
the 3 and 9 o’clock should be maintained during this
operation.
When the 3 wedges are firmly installed and positioned
for acceptable convergence, lock the wedges in place by
applying a 2.5 inches long strip of tape across the tabs
of each wedge firmly against the CRT glass. The CRT
glass surface should be clean and free of dust and other
foreign material.
UNUSUAL TILT CASE
There may be some instances where the picture tube
and yoke will require vertical tilt in the opposite (up)
direction to obtain convergence. In such cases, insert
the vertical tilt wedge at the bottom (6 o’clock)
position. Follow through on the horizontal tilt
adjustment by using the 2 and 10 o’clock positions and
secure each wedge with a piece of tape, as described
above.
IMPROVING CRT CORNER PURITY
CRTs that display corner purity problems even after
following the service procedures can be modified with a
picture correction kit (P/N 949-50). The purity can be
improved by placing a picture-correction magnet
(included in the kit) on the CRT funnel. Refer to the
following modification steps and illustration to place the
magnet properly. Fully degauss the CRT before installing
correction magnets.
MODIFICATION
1. Place the magnet on the CRT funnel as shown in the
figure displayed below, in the quadrant exhibiting
impurity.
2. Rotate the magnet in place to the position shown
for best purity.
3. Place a piece of 1/2" by 2" long Fiberglass tape over
the magnet to hold it in place.
4. Degauss the CRT once magnet is in place to insure
that the magnet is not over the internal magnet
shield.
Note:If the magnet is placed over the internal
magnet shield, any apparent purity correction
will disappear after degaussing. Reposition the
correction magnet off the internal shield and
degauss again.
ABCDEFGDAG0001 A-19197GROUNDING ASSY, WIRE AND TERMINAL, WHITE,
ABCDEFGDX2101 103-00347-03ADIODE, LOW VOLTAGE GENERAL, SILICON
ABCDEFGDX2102 103-00461ADIODE, FAST SWITCHING, HIGH CONDUCTANCE
ABCDEFGDX2103 103-00461ADIODE, FAST SWITCHING, HIGH CONDUCTANCE
ABCDEFGDX2104 103-00339-04ADIODE, LOW VOLTAGE GENERAL, SILICON
ABCDEFGDX3005 103-00461ADIODE, FAST SWITCHING, HIGH CONDUCTANCE
ABCDEFGDX3006 103-00344-06ADIODE, LOW VOLTAGE GENERAL
ABCDEFGDX3201 103-00344-06ADIODE, LOW VOLTAGE GENERAL
ABCDEFGDX3203 103-00347-03ADIODE, LOW VOLTAGE GENERAL, SILICON
ABCDEFGDX3204 103-00461ADIODE, FAST SWITCHING, HIGH CONDUCTANCE
DAG
DAG
RCREFPART#DESCRIPTION
GDX3250 103-00305-01ADIODE, HIGH VOLTAGE GENERAL, SILICON
GDX3251 103-00344-06ADIODE, LOW VOLTAGE GENERAL
ABCDEFGDX3252 103-00344-06ADIODE, LOW VOLTAGE GENERAL
ABCDEFGDX3401 103-00588ADIODE, LOW VOLTAGE GENERAL
ABCDEFGDX3402 103-00588ADIODE, LOW VOLTAGE GENERAL
ABCDEFGDX3403 103-00588ADIODE, LOW VOLTAGE GENERAL
ABCDEFGDX3404 103-00588ADIODE, LOW VOLTAGE GENERAL
ABCDEFGDX3601 103-00461ADIODE, FAST SWITCHING, HIGH
ABCDEFGDX3602 103-00344-06ADIODE, LOW VOLTAGE GENERAL
ABCDEFGDX3604 103-00461ADIODE, FAST SWITCHING, HIGH
ABCDEFGDX3700 103-00461ADIODE, FAST SWITCHING, HIGH