Copyright 2002 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 non-insulated “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 as 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 compo-
nents, 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 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
measures 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.
0.15uF
1500 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 on 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 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 titled
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.
SR24 - 923-03508CL - SAFETY
i
Page 3
PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO-VIDEO PRODUCTS
X-RADIATION
To prevent possible exposure to radiation caused by excessive CRT Anode voltage, the CH/CL Chassis incorporates a
“High Voltage Shutdown” circuit. This circuit senses the level
of 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 for about 5 seconds, after which, restart is attempted.
SHUTDOWN CIRCUIT OPERATION
The flyback pulse voltage from Pin 6 of TX3201 (Flyback Transformer) is peak detected (rectified) by the action of diode
D3000 and capacitor C3001. This forms a DC voltage appearing on C3001 representative of the CRT anode voltage (HV)
produced by T3201. This voltage is divided down by precision
resistors RX3001, RX3002, & RX3003. This lower voltage, appear on the positive input of IC3101.
If the CRT anode voltage becomes excessive, pin 5 of IC3101
will be higher than the negative input of pin 6. This will
cause the output of pin 7 to rise to approximately 15 volts.
This signal (SD_DRV) is sent to the base of Q4000 causing
the Horizontal Drive to be disabled and latched, which causes
the HV to shutdown. In about 5 seconds, the shutdown circuit resets (Pins 8, 9 & 14 of IC2900), the Horizontal Drive
and HV will be reestablished. The circuit formed by Q3104,
C3108, C3113, D3107, R3134, R3132, R3131, and R3133 disables the HV compensation output (Q3102-B signal) during
turn on and shutdown conditions (transients).
CRT ANODE HIGH VOLTAGE MEASUREMENT PROCEDURE
Each CRT screen has its own safe operating Anode Voltage
and shutdown voltage. Critical Safety components (designed
with an ‘X’ in the component designator) are designed to
operate the CRT at a safe operating Anode voltage and provide proper shutdown thresholds. If replacement of any of
these components are deemed necessary, it is important to
use original type Zenith replacement components.
After a replacement is made, confirm proper Anode voltage
using the following procedure.
Measurement of the CRT Anode voltage must be performed
with no visible raster on the screen and operating at nominal horizontal scanning frequency 37.9 khz (TV or SVGA signal).
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 below for the proper CRT screen size. If the voltage reading is higher than the maximum, verify circuit component values and proper operation.
HV SHUTDOWN MEASUREMENT PROCEDURE
1. Adjust the beam current to OmA in NTSC mode.
2. Apply a variable DC voltage to pin 10 of the PDT1 connector, from 20 to 0 VDC, starting at 20 VDC.
3. Slowly decrease supply towards zero.
4. Remove DC voltage from pin 10 of PTD1.
5. After approximately 5 seconds, verify that the HV must be
reestablished (High Voltage Reset).
WAVE FORMS ................................................ 6-15
WAVE FORMS ................................................ 6-16
SR24 - 923-03508CL - TOC
TOC-1
Page 6
- TOC-2 -
Page 7
SECTION 1
TX3204
IC2100
OVERVIEW
JP1
4E9
IC801
IC2900
Q5102
CRT1
5F2
CON1
CON2
Q5101
5C2
1E11
2E6
1
1
11E1
Q5103
MPI
6E2
LX3880
IC800
IC1400
ICX3801
TU240
2K6
IC6000
ICX2200
IC4201
IC6001
CON4H2
4G9
2C5
10VGA1
2F5
TX3601
QX3251
CX3610
2H4
QX3203
3Y3
CX3608
3T8
ICX3612
LX3401
1
CON3R8
CX3612
OVERVIEW
This manual covers the CL Chassis Commercial Sets which are similar to the CH Chassis sets. All suffix 35 models have stereo, surround,
MPI, and super video in/out ports. The CL series chassis features seven ICs for all signal, sync, and sweep processing.
ICX2200 - 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 - Vertical sweep amplifier.
IC2900 - Video switch.
ICX3612 - 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 jumper 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 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 CONNECTOR)
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.
SR24 - 923-035081-2CL - OVERVIEW
Page 9
OVERVIEW
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.
11
ANTENNA
CABLE
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 1-5) for programming other TVs in the
system with the same features as the master TV.
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. EBC KNOB
For handling/removal of EBC (Edge Board Card).
ANTENNA
CABLE
66
M. P.I.M. P.I.
MATRIXOUT
VIDEOIN
R-- AUDIO IN --L
2233
4
5
Used on HXXX35DT ModelsUsed on H25E34Y Models
1
ANTENNA
CABLE
6
2
VIDEOIN
VIDEOIN
SPEAKEROUT
AUDIOIN
4
SPEAKEROUT
AUDIOIN
4
5
5
Used on H25E39Y
SR24 - 923-035081-3CL - OVERVIEW
Page 10
OVERVIEW
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.
MUTE
Press to turn off sound while
picture remains. Press again
C
C
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
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.
124-00213-18
*TV/FM:
SC652Z
SC692
124-00213-03A
This key is not available in model 124-00213-18
SR24 - 923-035081-4CL - OVERVIEW
Page 11
OVERVIEW
Connect cable to
TV MPI Jack and
follow on-screen
instructions
MPI
QuickSet II Programmer
ZENITH ELECTRONICS CORPORATION, GLENVIEW, ILLINOIS USA
LT-2000 CLONE PROGRAMMER
The Quick Set II programmer LT2000 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 LT2000 for future use and recall.
When using the LT2000, operation will be easier if the TV is
connected to a good quality signal and is displaying a stable
picture. To operate the LT2000, use the indicated keys on an
installer’s remote or user’s remote, or the front panel keys on
the TV receiver.
SETUP
Begin the programming process by setting up a master TV set
using one of the installer’s remotes or an MBR remote. Follow
the instructions in the operating guide for the specific TV
model. Remember to set all features that will be customized
including the channel scan list, channel labels, and installer
menu setups.
Next connect the LT2000 to the master TV set using the cable
provided with the programmer. Connect the cable between
the MPI jack on the TV and the programmer. The TV set
automatically activates the programmer.
Once connected, check the “Status Indicator” LED on the
programmer. If the indicator is green and flashing (a doubleblink “heartbeat” pattern), proceed to the next step.
Status
Indicator
Color
green
red
Blink pattern
slow
heart beat
LT2000
Reset
battery OK
battery low
power on
no communications
power on
communications OK
NOTE: A slowly flashing green light indicates there is a
problem with the communications between TV and
programmer. In this case, check for damaged cable,
poor contacts, or other connection problems. If the
status indicator is red, the programmer batteries are
low.
If communications are good, the sign-on screen will be
displayed on the TV screen as shown on the quick setup
instructions. If the intention is to set the TV’s or programmer’s
real-time clocks, and not the clone clock or TV clock time
settings, then press a key to proceed to the 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 separated memory clear operation.
Setups stored in programmer memory are nonvolatile and will
be retained even after a battery change.
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. Four different TV setups can be stored in the LT2000.
Using the On-screen menu, choose a memory or choose to
return to the main selection menu. Now 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 the learning cycle, or press
any other keys to return to the selection menu to make another
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.
WRITE TO TV
Select “WRITE TO TV”, and then press ON/OFF, POWER, or ENTER
to begin teaching process. Alternatively, use the TV front
panel CHANNEL UP or 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 press ON/OFF, POWER, or ENTER to begin the teaching
process. Alternatively, use the TV front panel CHANNEL UP or
DOWN keys to highlight choice. Press ON/OFF, POWER, or ENTER
to begin.
SR24 - 923-035081-5CL - OVERVIEW
Page 12
OVERVIEW
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 set the real-time clock in the LT2000, 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 LT2000 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 the time setting was the last task.
SET TV CLOCK FROM CLONE
To set the real time clock in the, select “SET TV CLOCK FROM
CLONE” and then press ON/OFF, POWER, or ENTER to copy current
LT2000 time to the TV 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 LT2000 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 the 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.
The TV screen will display the items in the service menu setups.
Use this function to quickly check the TV for correct setup.
Press any key to clear display and return to the 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, then press ON/OFF, POWER, or ENTER to
begin.
The TV screen will display the memory selection menu. Select
the desired memory number, and then press ON/OFF, POWER,
or ENTER to display the contents of the selected memory.
Alternatively, use the TV’s 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 factory menu setup.
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.
Note: The following two items only appear on sets that do
not have the built-in ability to clone channel labels.
EDIT CHANNEL LABELS
Select the edit channel labels option and push ON/OFF, Power,
or Enter. Select the memory location (1,2,3,4) and edit.
VOL L/RSelects update label
CH U/DSelects label to be changed
MUTEClears present setting
ENTERLoads new labels
POWERExits the menu
SEND CHANNEL LABELS
Select the send channel labels option and push ON/OFF, Power,
or Enter. Select the memory location (1,2,3,4) and push ON/
OFF. A message will indicate that is doing the copy and when
it is finished.
OPERATION NOTES
Disconnect the LT2000 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 real-time clock setting. It
may be necessary to reset the clock from a TV programmed to
the correct time.
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 with the service
menu is activated. Processors before the 221-01006 have a
limited screen display capability. They cannot display entire
screens as shown in the quick setup instructions accompanying
the LT2000 programmer. Use the printed menu illustrations
on the quick setup sheet as an aid in making programming
choices.
SR24 - 923-035081-6CL - OVERVIEW
Page 13
USER MENUS
SECTION 3
SETUP MENU
Press the MENU key on the Installer’s remote repeatedly so that
the SETUP MENU appears on the screen.
SETUP MENU
AUTO PROGRAMTO PROGRAM
ADD/DEL/BLNK
CH. LABELS
CLOCK SET
CAPTIONS
LANGUAGE
AUTO PROGRAM
Using the Up Arrow on the remote control, highlight AUTO
PROGRAM on the screen. Then press a RIGHT/LEFT Adjust arrow
button to reach the AUTO PROGRAM screen. Using the Up
Arrow, choose either CABLE TV or OFF-AIR ANTENNA. Press a
RIGHT or LEFT ADJUST arrow to begin the Channel Search. The
receiver searches for available channels and stores them in
memory for user access.
ADD/DEL/BLNK
Press the Up Arrowrepeatedly 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 ENTER to add a deleted channel.
Using the Right/Left 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 the Up Arrow to choose the CH LABELS option.
Pressing either the Right/Left 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.
You also has the option of creating 20 programmable labels
having five digits each.
CLOCK SET
Press MENU repeatedly to show the Setup menu. Use the Up
Arrow 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.
CAPTIONS
CAPTION is a feature that allows the TV to receive closed
captions and/or text options when made available by the
broadcaster.
There are two operating modes for caption: quick/mute and
standard: If quick mute is selected, pressing the cc key shows
the current cc selection.
Note:
Selecting the none option means the channel will not have a label.
SR24 - 923-035081-7CL - OVERVIEW
Selecting this label option means the channel will not be displayed on the channel/time/audio signal display.
Page 14
USER MENUS
BRIGHTNESS
COLOR
TINT
VIDEO MENU
CONTRAST
PICTURE PREFPRESET
SHARPNESS
Use the Right/Left 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.
LANGUAGE
In the Language menu, use the Right/Left 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.
AUDIO MENU
BASS
TREBLE
BALANCE
AUDIO MODESTEREO
FRONT SURROFF
SOUNDRITEOFF
AUDIO PREFCUSTOM
VIDEO MENU
Press MENU repeatedly until the Video Menu appears.
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 be-
tween amounts of red and green in the TV picture). Has 64
steps (0 to 63).
• SHARPNESS: Raises or lowers the definition of the TV pic-
ture. The lower the level, the softer the images will appear
(adjusts the sharpness of the 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.
Using the Up Arrow 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 29 steps (0 to 28).
•AUDIO MODE: Selects between stereo, Mono, Stereo and 2
nd
Audio/SAP. If 2nd Audio/SAP is selected, but the current
channel does not support SAP either Stereo or Mono will
be heard.
•FRONT SURR: 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, par-
ticularly while changing channels.
•AUDIO PREF: This feature allows the customer to maintain
two separate audio settings by selecting “custom” or “preset”. The Factory gets the “Preset” setting and the customer sets “custom”.
Press a RIGHT/LEFT ADJ arrow to adjust or change the option you
have selected. Press ENTER to return to TV viewing, or press
the Up Arrow to adjust another option.
SR24 - 923-035081-8CL - OVERVIEW
Use the Up Arrow on the remote control to highlight the setting
you want to change. Press Right/Left arrow to adjust or change
the option you have selected.
Press ENTER to return to TV viewing, or press the Up Arrow to
change other options in the video menu.
PARENTAL CONTROL
This optional feature can be used to prevent (block) unwanted
programming from appearing on your TV.
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.
Page 15
USER MENUS
PARENTAL CONTROL can be preset and turned on or off by a user
who specifies the 4 number password. The number of hours
blocked must 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.
PARENTAL CONTROL
AUX SOURCES
MPAA RATING
AGE BLOCK
CONTENT BLOCK
SET HOURS
SET PASSWORD
LOCK ON OFF
TO BLOCK
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 on
the next page). 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: the viewer will not be
able to see TV-PG, TV-14, or TV-MA rated programming.)
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 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 restric-
tions 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.
• 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 the Up Arrow
to choose an option, such as CONTENT BLOCK. Use the Left/
Right arrow to show the CONTENT BLOCK menu, to adjust or
set the rating for an option.
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.
ON-SCREEN DISPLAYS
CHANNEL/TIME/AUDIO DISPLAY
Press ENTER. Shows currently selected channel or source,
current time if the clock has been set, and incoming audio
signal.
CH PREVIEW MENU
Press SURF. Displays list of the available TV Channels, Guest
Parental Control menu (if active) and Video Channel access.
SR24 - 923-035081-9CL - OVERVIEW
Page 16
USER MENUS
Press CHANNEL UP/DOWN to select a channel, then ENTER to
go to that channel. Pressing CC will activate the Parental
Control menu.
CHANNEL PREVIEW
NBC
2
NONE
3
PBS
4
5
NONE
CBS
6
ABC
7
NONE
8
NONE
9
NONE
10
CH / TO SELECT, ENTER TO QUIT
CC FOR PARENTAL CONTROL
CAPTIONS DISPLAY
Press CC. Sets and displays the Caption/Text options. See the
Captions section on page 1-7.
cc
CAPTIONS
OFF
MOTION PICTURE ASSOCIATION OF AMERICA (MPAA) RATING SYSTEM
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 Lan-
Suggestedguage, Sex, 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.
SR24 - 923-035081-10CL - OVERVIEW
Page 17
SECTION 2
SERVICE MENU
SERVICE MENU
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-four 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,
91 or 92 (Healthview) menu items are available. In the Factory Menu, only the selected menu item is displayed, near
the top of the screen.
1390 - 061.5701
Microcontroller
part number
03HPos9
Build Date
10/05/02
In the Factory Menu, only the selected menu item is displayed, near the top of the screen. 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.
01 PRESET PX: Stores the video 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.
02 PRESET AX: Stores customer Audio menu adjustments in the
nonvolatile memory of the EAROM. Selections are Custom and
Preset-Store. Settings for Bass, Treble, Balance and SoundRite
are stored in this manner.0 is custom and 1 is Preset stored.
03 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 turn off time, an on-screen message appears telling you to press any key to continue normal viewing. When set to 0, this feature is inactive.
04 VERT P0S: Moves On-Screen Displays vertically. The Range is
from 0-25. This adjustment is generally set at 5.
Program
Revision
Factory Option
Font
Revision
TE Status
TE=10110000
07 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.
08 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.
09 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.
10 KEY DEFEAT: When set to 1, the end user cannot access the
screen menus from the front panel . Menu, SELECT , and
ADJUST do not work. When set to 0, those keys are functional. The menus can always be accessed with menu on the
remote.
11 STRT CH: Determines the channel that is selected automati-
cally 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.
12 STRT VOL: Determines the volume that is selected automati-
cally each time the TV is turned on and sets the audio volume
level at turn-on. Range is 0-255. If 255 is used then the
volume takes the last used volume.
13 HOSPITAL MODE. (Range 0-2) The default is 0 for Concierge
and 1 for hospital Models, If it is 1 the Private IR codes are
selected. Used with Feature level to select the IR type code.
14 CHAN LOCK: Range is 0-1. 0 is Off and 1 is On. When set to
1, the TV must always be on the same channel. Changing
channels with the Channel up/down or the keypad numbers.
Generally , this feature is used in connection with Start Channel . When Ch Lock is active AUTOPROGRAM and ADD/DEL in
the SETUP MENU are not active.
15 GHOST CH: Either on or not signal present, 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.
16 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. In scan modes 1and 3 the power On/Off
could be changed with Start Ch SM=1 to Start channel.
05 H0RZ POS: Moves On-Screen Displays horizontally. Range is
from 1-15. Generally set at 9.
06 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
SR24 - 923-035082-1CL - SERVICE MENU
Scan Mode Characteristics
0 TV, VCR3, VCR4 , AUX
1 TV, VCR3, VCR4, AUX,ON/OFF
2 TV, VCR3, VCR4, FM ,AUX
3 TV, VCR3, VCR4, FM,AUX, ON/OFF
17 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.
Page 18
SERVICE MENU
18 SLEEP TIMER: Enables sleep timer key. Range is 0-1. Zero is
off and 1 is on.
19 ALARM: Enables Alarm key. Range is 0-1. Zero is off and 1 is
on.
20 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 work.
21 OLD OCV: (On Command Video) Zero is off, one is on. Set to
one for operation with “Spectramate” systems from On Command Corporation.
22 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.
23 FUNCTION PRE: (Function Menu Channel Preview) Range is
0-3. 0-1 Shows up and suppress channel preview screen in
the function menu with some pay per view systems. 2-3 as
the same like 0-1 respectively plus Show up and suppress
Caption lock option in Caption menu.
24 FEATURE LEVEL: Range is 0-1. If its is 1 and Hospital Mode=0
or 2 the selected IR codes are Zenith, in another way the
selected IR codes are Private.
25 TRAP 3.58: Zero is off, one is on. Set to 1 to normal TV
operation. Set to 0 if Y/C is used at chassis with a comb
filter.
38 60HZ SW: (60 Hertz Switched) The range is 0 to 2.
39 PIF VCO: ( PIF Voltaje Controlled Oscillator ) . Range is 0-
127.
40 RED CUT: B&W tracking adjustment. Range is 0- 254. Typi-
cal value is 20.
41 GREEN CUT: B&W tracking adjustment. Range is 0-254. Typi-
cal value is 0.
42 BLUE CUT: B&W tracking adjustment. Range is 0-254. Typi-
cal value is 28.
43 GREEN GAIN: B&W tracking adjustment. Range is 0-254.
Typical value is 45.
44 BLUE GAIN: B&W tracking adjustment. Range is 0-254. Typi-
cal value is 70.
45 6 KEY SYSTEM: Keyboard type. Set to 1 for 6 key and 0 for
10 key.
46 A ATT: Audio Attenuation adjustment.
47 A VCO: Stereo VCO and Audio SAP VCO free running frecuency
Adjustment.
48 A FILTER: STEREO, SAP and dbx filter adjustment.
49 A SPECTRAL: Adjustment of stereo separation(3 khz)
50 WIDE BAND: Adjustment of stereo separation(300 hz).
26 RF BAND PASS: Sets adjustment range of the customer con-
trol for brightness in therefore mode. Range is 0-1. Set to 1.
27 RF BRT (RF brightness) Sets adjustment range of customer
control for brightness in RF mode. Range is 0-63. A typical
value is 30.
28 AUX BRT: (Auxiliary Brightness) Sets adjustment range of
the customer control for brightness in AUX mode. Range is 0-
63. Typical value is 30.
29 MAX CONTRAST: Sets adjustment range of customer control
for contrast. Range is 0-63. Typical value is 63.
30 VERT SIZE: (Vertical Size) Range is 0-254.
31 HORZ SIZE: (Horizontal Size) Range is 0-254.
32 VERT PHASE: (Vertical Phase) Range is 0-7.
33 HORZ PHASE: (Horizontal Phase) Range is from 0-31.
34 AUDIO LEVEL: Sound Attenuation range is 0-63.
35 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.
36 HORZ AFC: Range is 0-1. Set to 0. 0=AFC Normal. 1=AFC X 3.
37 WHITE COMPRESS: (White Compression) The range is 0 to 1.
Set to 0. 0 = Enable and 1 = Disable.
51 MAX BLK HRS: Range (0-99), Configure the maximum let-
ting Vchip blocking hours
52 START CH IN SM: Range (0-1) Used to enable the Start Chan-
nel like the programable power on/off channel in the Scan
Modes 1or 3.
53 RADIO: Enable or disable the access to radio function. 54
AUX. Enable the access to auxiliary input.
55 VCHIP: Enable the V Chip function.
56 MUTE DISABLE: If it is enabled (set to 1) it disable the
functionallity of the Mute Key.
57 EN LA7222: Used in Concierge Models to enable separate
auxiliary inputs (Camport and Rear Auxiliar).
58 AUTO CAMPORT: Enables the automatic switching to Camport
input when it is sensed.
59 ACK MASK: Used with Spectramate SN 0583358 Cable box to
mask the acknowledge in MPI comunications.
60 POLL RATE Range (20-168) Used to adjust the polling rate
in the MPI Communicaions. The Standard is 94.
61 TIMING PULSE. Range (186-227) Used to vary the standard
width of the pulses in the MPI Communications. The Standard is 217.
64 DIS VIDEO MENU: Disable/Enable displaying Video Menu.
65 DIS PARENTAL: Disable/Enable displaying Parental M.
66 CH TIME: Disable/Enable displaying CH TIMER.
67 EN SET UP COLORS: Disable/Enable custom colors for Setup
Menu.
68 AUDIO COLOR MENU: Disable/Enable custom colors for Au-
dio Menu.
69 VIDEO COLOR MENU: Disable/Enable custom colors for Pa-
rental Menu.
70 PARENTAL COLORS: Disable/Enable custom colors for Paren-
tal Menu.
71 CH TIMER COLORS: Disable/Enable custom colors for Ch Time.
72 FOREGROUND SETUP MENU: Select between (0 to7) to set
foreground Custom Setup Menu colors.
0- Black4- Blue
1- Red5- Magenta
2- Green6- Cyan
3- Yellow7- White
73 FOREGROUND AUDIO: Select custom foreground color for
Audio Menu.
82 CH TIME-SIZE: If it is set to 1 and the transparecy attribute
is selected and the TV is unblocked; the number of the current channel is shown in big size at the right upper corner of
the screen.
83 DEFEAT XDS: Set to 1 for not displaying the length, elapsed
time and title of TV programs.
84 CH NOT-AVAILABLE: Set this option to 1 and Ch-Override to
0 to display a message on the bottom of the screen when
attempting to enter a not added channel.
85 EN TIMER: This option is used to enable a new option in the
setup menu to configure a programmable ON/OFF Timer.
86 UPN MSB: A Unique Programmable Number is used to iden-
tify a TV in a TV net. This number is composed by 4 Programmable number (from the current option to option 89).
87 UPN MSB-1: MSB-1 of the Unique Programmable Number.
88 UPN MSB-2: MSB-2 of the Unique Programmable Number.
89 UPN LSB: LSB of Unique Programmable Number.
90 AIR AFT: Set to 1 to enable AFT independient of the cur-
rent tunning band.
91 IR BANKS ENABLE: In E line there are 4 new keys to access
the channel banks directly. This function is enabled when set
to 1, When set to 0 this function is disabled.
74 FOREGROUND VIDEO: Select custom foreground color for Video
Menu.
75 FOREGROUND PARENTAL M: Select custom foreground color
for Parental Menu.
76 FOREGROUND CH TIMER: Select custom foreground color for
Ch Time Display.
77 BACKGROUND SET UPMENU: Select the background for cus-
tom color settings. Select between (0 to7) to set Background
Setup Menu colors.
0- Black4- Blue
1- Red5- Magenta
2- Green6- Cyan
3- Yellow7- White
78 BACKGROUND AUDIO Select the background color for cus-
tom color setting as in 77 item for Audio Menu.
79 BACKGROUND VIDEO Select the background color for custom
color setting as in
77 item for Video Menu.
80 BACKGROUND PARENTAL Select the background color for cus-
tom color setting as in 77 item for Parental Menu.
81 BACKGROUND CH TIMER Select the background color for cus-
tom color setting as in 77 item for Parental Menu.
SR24 - 923-035082-3CL - SERVICE MENU
Page 20
SERVICE MENU
CL Chassis Factory Menu Settings
ITEMRANGEH20E35DT HW20E35DT HW25E35DT H25E34Y H25E35DT DESCRIPTION
00 FACT MENU0-100000Factory mode - refer to page 2-1
01 PRESET PX0-111111Used to store video menu adju stments
02 PRESET AX0-111101Used to store aud io men u adjustments
03 POWER MANAGE 0-700000Hours TV will operate if not attended
04 VERT. POS0-301515151515Moves On Screen display vertically
05 HORZ POS0-452020202320Moves On Screen display horizontally
06 BAND/AFC0-700000Broadcast Band adjustment
07 MIN VOLUME0-6300000Sets min. customer volume level
08 MAX VOLUME0-636363636363Sets max. customer volume level
09 AC ON0 -100000AC power feature
10 KEY DEFEAT0-111111Disables part of control panel
11 STRT CH0-255255255255255255Determines channel at turn on
12 STRT VOLUME0-63,255255255255255255Determines volume at turn on
13 HOSPITAL MODE 0-200000Remote control frequency level
14 CHAN LOCK0-100000Defeats tuning operation
15 GHOST CH0-100000In On mode, channel # will stay on screen
16 SCAN MODE0-300000Chann el adju st cycles On/Off
17 TEXT MODE0-111111Turns Text mode on or off in CC menu
18 SLEEP TIMER0-111111Enables Sleep Timer feature
19 ALARM0-111111Enable Alarm Key
20 CH. OVER RIDE0-111111Channel scan toggle
21 OLD OCV0-100000On Command Video toggle
22 CAPTION LOCK0-100000Caption state is maintained after power off
23 FUNCTION PRE0-300000Menu Channel Preview switch
24 FEATURE LEVEL 0 -111111Selects Zenith or private label
25 TRAP 3.580-1000003.58 Mhz trap
26 RF BANDPASS0-111111Luma Filter toggle
27 RF BRT0-633030303 03 0Brightn ess fo r RF mode
28 AU X BRT0-633 030303030Brightness for AUX mod e
29 MAX CONTRAST0-636363636363Sets maximum customer control for contrast
30 VSIZE0-254165165165155165Vertical size
31 HSIZE0-254118118118118118Horizontal size
32 VERT PHASE0-722222Shifts picture vertically
33 HORZ PHASE0-311616161516Shifts picture horizontally
34 AUDIO LEVEL0 -634 64 6464646Audio level co ntrol
35 RF AGC0-634646464646Weak channel adjustment
36 HOR AFC0-111111Horizontal Automatic Frequency control
37 WHITE COMP0-100000White compression
38 60HZ SW0-22222260 Hertz Switched
39 PIF VCO0-1275252525252PIF Voltage Controlled Oscillator
40 RED CUT0-25400000B&W tracking adjustment
41 GREEN CUT0-25400000B&W tracking adjustment
42 BLUE CUT0-25400000B&W tracking adjustment
43 GREEN GAIN0-2 548 080808080B&W tracking adjustment
44 BLUE GAIN0-2549090909090B&W tracking adjustment
45 6 KEYS SYS0-100000Keyboard Type
46 A ATT0-1599999Audio Attenu ation
47 A VCO0-633131313131Audio Voltage Controlled Oscillator
48 A FILTER0-633131313131Audio Filter Adjustment
49 A SPECTRL 0-6 33131313131Adjustment of High Frequency Stereo Separation
50 WIDE BAND0-633131313131Low Frequency Stereo Sep aration
51 MAX BLK HRS0-991212121212Max Blank Hours for V-Chip
52 STRT CH IN SM0-100000Enable start channel at scan mod e
53 RADIO0-111101Enable/Disable Radio Function
54 AUX0-111111Enable the access to auxiliary input
55 V-CHIP0-111111Enable V chip Block
SR24 - 923-035082-4CL - SERVICE MENU
Page 21
SERVICE MENU
CL Chassis Factory Menu Settings
ITEMRANGEH20E35DT HW 20E35DT HW25E35DT H25E3 4Y H2 5E35DT DESCRIP TION
56 MUTE DISABLE0-100000Disabel mu te key
57 EN LA72 220-111000Enable separate auxiliary inputs (Camport/Rear Aux)
58 AUTO CAMPORT0-111101Enable auto camport switch
59 ACK MASK 0-100000Used in MPI co mmunicatio n
60 POLL RATE20-1699494949494Select Poll rate for MPI communications
61 TIMING PULSE186-227207207207207207Select timming pulse for MPI communication
62 DIS. SETUP M0-100000Disable/Enable displaying Setup Menu
63 DIS. AUDIO M0-100000Disable/Enable displaying Audio Menu
64 DIS. VIDEO M0-100000Disable/Enable displaying Video Menu
65 DIS. PARENTAL 0-100000Disable/Enable displaying Parental Menu
66 DIS. CH-TIME0-100000Disable/Enable displaying CH-TIME
67 EN. SET. COL0-100000Disable/Enable custo m colors for Setup Menu
68 EN. AUD. COL0-100000Disable/Enable custom co lors for Audio Menu
69 EN. VID. COL0-100000Disable/Enable custo m colors for Video Menu
70 EN. PT L. COL0- 100000Disab le/En able c usto m colors for P arental Menu
71 EN. CH-T COL0-111111Disab le/Enable custom colors for CH-TIME
72 F OR. SETUP M0 -766666Se lec t fo rg rou nd col or for Setu p Menu
73 F OR. AUDIO M0-711111Select fo rgrou nd co lor fo r Au dio Menu
74 F OR. VIDEO M0-744444Select fo rg rou nd c olor for V id eo Men u
75 F OR. PTL M0 -766666Selec t fo rgrou nd col or fo r P aren tal Men u
76 F OR. CH- TIME0-711111Selec t fo rgrou nd color fo r CH -TIME
77 BCK. SETUP M0-744444Select background color for Setup Menu
78 BCK. AUDIO M0-777777Select background color for Audio Menu
79 BCK. VIDEO M0-777777Select background color for Video Menu
80 BCK. PTL M0-744444Select background color for Parental Menu
81 BCK. CH-TIME0-711111Select background color for CH-TIME
82 CH TIME-SIZE0-100000Show the number of the current channel
83 DEFEAT XDS0 -100000Disable the extended services like program leng h, TV titles, etc.
84 CH NOT AVAILABLE 0-100000
85 EN TIMER0-111111Enable a new option to configure a programmable on/off Timer.
86 UPN MSB0-255LINE DAYLINE DAYLINE DAYLINE DAY LINE DAY Unique programmab le Numb er
87 UPN MSB-10-255WEEKWEEKWEEKWEEKWEEKUn ique programmab le Number
88 UPN MSB-20-255S.N. HIGHS.N. HIGHS.N. HIGHS.N. HIGH S.N. HIGH Unique p rogrammable Number
89 UP N LSB0-25 5S.N. LOWS.N. LOWS.N. LOWS.N. LOWS.N. LOW U niqu e programmable Number
90 AIR AFT0-100000Enable AFT independent of the current tunning band
91 IR BANKS ENABLE0-111111Disable the op tion to acces the channel banks
Display a message when attempt entering a not added channel.
SR24 - 923-035082-5CL - SERVICE MENU
Page 22
SERVICE MENU
CL Chassis Factory Menu Settings
ITEMRANGEH25E39Y H27E35DT H32E35DT H36E35DT HPK20E35DT HPK27E35DT DESCRIPTION
00 FACT MENU0 -1000000Fact ory mode - refer to page 2-1
01 PRESET PX0-1111111Used to store video menu adjustments
02 PRESET AX0-1011111Used to store aud io menu adjustments
03 POWER MANAGE 0-7000000Hours TV will operate if not attended
04 VERT. POS0-30151515151515Moves On Screen display vertically
05 HORZ POS0-45242420202024Moves On Screen display horizontally
06 BAND/AFC0-7000000Broadcast Band adjustment
07 MIN VOLUME0-63000000Sets min. customer volume level
08 MAX VOLUME0-63636363636363Sets max. customer volume level
09 AC ON0-1000000AC power feature
10 KEY DEFEAT0-1111111Disables part of control panel
11 STRT CH0-255255255255255255255Determines channel at turn on
12 STRT VOLUME0-63,255255255255255255255Determines volume at turn on
13 HOSPITAL MODE 0-2000000Remote control frequency level
14 CHAN LOCK0 -1000000Defeats tuning o peratio n
15 GHOST CH0-1000000In On mode, channel # will stay on screen
16 SCAN MODE0-3000000Channel adju st cycles On/Off
17 TEXT MODE0-1111111Turns Text mode on or off in CC menu
18 SLEEP TIMER0-1111111Enables Sleep Timer feature
19 ALARM0 -1111111Enable Alarm Key
20 CH. OVER RIDE0-1111111Channel scan tog gle
21 OLD OCV0-1000000On Command V ideo toggle
22 CAPTION LOCK0 -1000000Caption state is maintained after power off
23 FUNCTION PRE0-3000000Menu Channel Preview switch
24 FEATU RE LEVEL 0-1111111Selects Zenith o r private label
25 TRAP 3.580-10001003.58 Mhz trap
26 RF BANDPASS0-1111111Luma Filter toggle
27 RF BRT 0-63 30303030 30 30Brightness for RF mode
28 AUX BRT0-63303030303030Brightness for AUX mode
29 MAX CONTRAST0-63636363636363Sets maximum customer control for contrast
30 VSIZE0-254155165165185165165Vertical size
31 HSIZE0-254150150118140118150Horizontal size
32 VERT PHASE0-7222322Shifts picture vertically
33 HORZ PHASE0-31151616161616Shifts picture horizontally
34 AUDIO LEVEL0-634646464 64646Au dio level control
35 RF AGC0-634646464 64646Weak channel adjustment
36 HOR AFC0-1111111Horizontal Automatic Frequency control
37 WHITE COMP0-1000000White compression
38 60HZ SW0-222222260 Hertz Switched
39 PIF VCO0-127525252525252PIF Voltage Controlled Oscillator
40 RED CUT0-254000000B&W tracking adju stment
41 GREEN CUT0-254000000B&W tracking ad justment
42 BLUE CUT0-254000000B&W tracking adju stment
43 GREEN GAIN0-2 54808080808080B&W tracking adjustment
44 BLUE GAIN0-254909090909090B&W tracking adjustment
45 6 KEYS SYS0-1000000Keyboard Type
46 A ATT0-15999999Audio Attenuation
47 A VCO0-63313131313131Audio Voltage Controlled Oscillator
48 A FILTER0-63313131313131Audio Filter Adjustment
49 A SPECTRL 0-6 3313131313131Adjustment of High Frequency Stereo Sep aration
50 WIDE BAND0-63313131313131Low Frequency Stereo Separation
51 MAX BLK HRS0-99 12121212 12 12Max Blank Hours for V-Chip
52 STRT CH IN SM0-1000000Enable start channel at scan mo de
53 RADIO0-1000011Enable/Disable Radio Function
54 AUX0-1111111Enable th e access to auxiliary inpu t
55 V-CHIP0-1111111Enable V chip Block
58 AUTO CAMPORT0-1011111Enable auto camport switch
59 ACK MASK 0-1000000Used in MPI communication
60 POLL RATE20-169949494949494Select Poll rate for MPI communications
61 TIMING PULSE186-227207207207207207207Select timming pulse for MPI communication
62 DIS. SETUP M0-1000000Disable/En able d isplaying Setup Menu
63 DIS. AUDIO M0-1000000Disable/Enable displaying Audio Menu
64 DIS. VIDEO M0-1000000Disable/Enable displaying Video Menu
65 DIS. PARENTAL M0-1000000Disable/Enable displaying Parental Menu
66 DIS. CH-TIME0-1000000Disable/Enable displaying CH-TIME
67 EN. SET. COL0 -1000000Disable/Enable custom colors for Setup Menu
68 EN. AUD. COL0-1000000Disable/Enable custom colors for Audio Menu
69 EN. VID. COL0-1000000Disable/Enable custom colors for Video Menu
70 EN. PTL. COL0-1000000
71 EN. CH-T COL0-1111111Disable/Enable custom colors for CH-TIME
72 FOR. SETUP M0-7666666Select forground color for Setup Menu
73 FOR. AUDIO M0- 7111111Select forg rou nd color for Aud io Menu
74 FOR. V IDEO M0-7444444Select forgrou nd co lor for Vid eo Menu
75 FOR. P TL M0-7666666Select forg rou nd co lor for Parental Menu
76 FOR. CH-TIME0-7111111Select forg rou nd color for CH-TIME
77 BCK. SETUP M0-7444444Select backg round co lor for Setu p Menu
78 BCK. AUDIO M0-7777777Select background color for Audio Menu
79 BCK. VIDEO M0-7777777Select background color for Video Menu
80 BCK . PTL M0-7444444Sel ect backg roun d c ol or fo r Parental Menu
81 BCK. CH-TIME0-7111111Select background color for CH-TIME
82 CH TIME-SIZE0-1000000Show the nu mber of the current channel
83 DEFEAT XDS0-1000000
84 CH NOT AVAILABLE 0-1000000
85 EN TIMER0-1111111
86 UPN MSB0-2 55LINE DAY LINE DAYLINE DAYLINE DAYLINE DAYLINE DAYUnique programmable Number
87 UPN MSB-10-255WEEKWEEKWEEKWEEKWEEKWEEKUnique programmable Number
88 UPN MSB-20-255S.N. HIGH S.N. HIGH S.N. HIGH S.N. HIGHS.N. HIGHS.N. HIGHUnique programmab le Numb er
89 UPN LSB0-255S.N. LOWS.N. LOWS.N. LOWS.N. LOWS.N. LOWS.N. LOWU nique programmab le Number
90 AIR AFT0-1000000
91 IR BANKS ENABLE0-1111111Disable the option to acces the channel banks
Enable separate auxiliary inp uts (Camport/Rear
Aux)
Disable/En able custom co lo rs for Paren tal
Menu
Disable the extended services like program
lengh, TV titles, etc.
Display a message when attempt entering a
not added channel.
Enable a new option to configure a
pro grammable on/off Timer.
Enable AFT independent of the current
tunning band
SR24 - 923-035082-7CL - SERVICE MENU
Page 24
Page 25
SECTION 3
SERVICING
GENERAL INFORMATION
Servicing the CL 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.
MODULE-LEVEL SERVICING
The CL Chassis is Module LeveL repair only. Replacement
modules are available on an exchange basis.
If the CRT or Video processor IC is 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 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” 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 (W5101) 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 32 inch & B+ 124 VDC for 27 inch.
+15 VSB at CX3800
+14 +VL at C3803
+5 VSB at CX3802
Power On at IC6000 pin 32
Check the following:
Keyboard input at IC6000 pins 7 and 8
IR input at IC6000 pin 15
Power On output at IC6000 pin 32
Q3802 power supply “turn on” transistor.
Check the switched voltages:
+15 VSW DC at CX3804
+15 VAUD DC for the Audio Amp at LX3805
+9 VSW DC CX3806
SWEEP DERIVED VOLTAGES
+25 volts DC at (+) CX2105
+35 volts DC at the junction of CX3253 and DX3252
+215 volts DC at the juction of CX3208 and RX3208
+33 volts DC at the juction of RX3216 and ZD6001
CRT FILAMENT
Check at pin 1 and 2 of connector 2F5. This should read
voltages between 6.1 and 6.3 volts AC on a true RMS
meter.
VIDEO PROCESSOR ICX2200
Check the following key operating signals and voltages:
Luminance at ICX2200 pin 43
Chroma at ICX2200 pin 45
Horizontal drive at pin 32
Vertical drive at pin 24
R Out pin 19
G Out pin 20
B Out pin 21
Serial Clock, Serial Data pins 27 and 28 respectively
VCC 9 volts pins 9, 26, 46 & 48
R in from micro (IC6000) at pin 15
G in from micro (IC6000) at pin 16
B in from micro (IC6000) at pin 17
MICROPROCESSOR
Check the following:
IR in on pin 15
+5 volts on pins 27 and 18
Serial Data, Serial Clock on pins 36 and 38
Reset at pin 30
Horiz. SYNC at pin 1, Vertical SYNC at pin 2
R Out at pin 52, G Out at pin 51 and B Out at pin 50
SR24 - 923-035083-1CL - SERVICING
Page 26
SERVICE ADJUSTMENTS (continued)
VERTICAL CIRCUIT
Check the following:
Vertical drive at pin 3.
Vertical out at 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 RX3010.
Scan derived voltages +25V, +35V, +215V, +33V.
HIGH VOLTAGE AND X RADIATION PROTECTION
Without high voltage (HV) adjustments, the picture tube
iS a potential source of X-rays. An HV shutdown
circuit is used to prevent excessive HV and X-ray emissions.
THEORY OF OPERATION (SHUTDOWN CIRCUIT)
This circuit monitors the sweep pulse voltage derived
from 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) increase
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. Unplug
the AC cord to reset the microcontroller.
HIGH VOLTAGE TEST PROCEDURE
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.
External Power
Supply
4-8Volts
R1
100 Kohm
AV SHUTDOWN EXTERNAL
Q2
121-1187
R4
1 Kohm
1 Kohm
Q1
121-1187
R5
220 Ohm
MODULE
RX3703
27" 174K
32" 182K
R3
RX3704
3.57K
C
A
ICX3702
R
SR24 - 923-035083-2CL - SERVICING
Page 27
SERVICE ADJUSTMENTS (continued)
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:
#35 RF AGC should be at least 40.
#39 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 (#39) to 2.5 volts DC.
AGC DELAY
With a strong noise-free antenna signal, adjust RF AGC
(#34) 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.
If no audio is present, access the Service Manual and
check the default setting for the following item:
#34 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 L1202 for 4 volts DC.
Note: Wait at least five minutes after the set has been
turned on before making alignments.
STEREO LEVEL ADJUSTMENT
1. Apply an RF signal with good video and audio at
400 Hz and 100% modulation.
2. Access item #34 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 #34 to 490 to 500mV AC.
MTS DECODER ALIGNMENT
This procedure is adjusts the register of SONY audio
decoder and processor CXA2054S. Five registers of the
audio processor should be adjusted. TEST-DA=”0” and
TEST1=”0” conditions are selected when the FACT MENU
is set to 1.
Press the “B” key of the remote control. The ten bits
registers will display at the bottom of the screen. The
first one is TEST-DA register and the second one is TEST1
register. Press the “QUIT” key of the remote control in
order to set TEST-DA=”0” and TEST1=”1”. Press the “QUIT”
key again to invert the state of the registers.
A ATT ADJUSTMENT
Set bits TEST-DA= ”0” and TEST1= “0” of IC1400. Set the
chassis for RF input. Input signal: PIF 30 dBmv modulated with color bars at 85% mod., SIF 19 dBmv modulated with 100 Hz at 25 KHz deviation (100% mod.), 75
µs off. Adjust item A ATT (#45) for 490 mVrms (±10mVrms)
in TVOUT-L output, pin #44 of IC1400.
STEREO, SAP VCO ADJUSTMENT
Set bits TEST-DA= ”1” and TEST1= ”0”. Monitor the TVOUTR output frequency (pin #43 of IC1400) in a no input
state. Adjust item A VCO (#46) so that frequency is as
near to 62.936 KHz (±0.5 KHz) as possible.
STEREO, SAP DBX FILTER ADJUSTMENT
Set bits TEST-DA= ”0” and TEST1= ”1”. Input 9.4 KHz,
600mVrms to COMP-IN pin #19 of IC1400. While monitoring the STATUS FLAG of IC1400, adjust item A FILTER
(#48).
SEPARATION ADJUSTMENT
Set bits TEST-DA= “0” and TEST1= “0”. Set the chassis for
RF input. Set IC1400 to stereo mode.
a) Input signal: PIF 30 dBmv modulated with color bars
at 85% mod., SIF 19 dBmv modulated with stereo
signal, 300 Hz at 12.9 KHz deviation (30% mod.), left
channel only, dBx On.
b) Adjust item WIDEBAND (#50) to reduce right speaker
output to a minimum. Set the frequency SIF signal to
3 KHz. Adjust item A SPECTRAL (#49) to reduce right
speaker output to a minimum.
SR24 - 923-035083-3CL - SERVICING
Page 28
SERVICE ADJUSTMENTS (continued)
G2 ADJUSTMENT
Use the following procedure when resetting G2.
1. Set brightness and contrast in the Video menu to
mid range.
2. Set color level minimum.
3. Connect the output of an NTSC generator to the
antenna input on the receiver.
4. Select a color bar signal and turn color off. Adjust
the G2 control so that the range of bar pattern
starts from completely white (not overdriven) to
black. Leave visible 6 of 8 bars.
5. Return color level control to its normal setting.
FOCUS ADJUSTMENT
1. Connect the output of an NTSC generator to the
antenna input on the receiver.
2. Select white raster pattern.
3. Push menu key of remote control to observe the
OSD.
4. Adjust focus potentiometer to obtain the best focus at letters of menu.
ADJUSTMENT OF RGB CUTOFF
NOTE: If the Main Module or the CRT has been replaced,
G2 must be readjusted before adjusting the RGB
Cutoff.
1. Enter the Service menu to gain access to the cutoff
adjustments. (Factory mode item 00 must be set to
1 to gain access to this adjustment).
2. Set G Gain (Green) and B Gain (Blue) registers in the
Service menu to the default setting for the screen
size as listed in the service menu. See table.
3. Set color level and contrast to minimum. Set tint
to mid range.
Control:Register27"32"
Green Gain439090
Blue Gain449090
4. Connect the output of an NTSC generator to the
antenna input of the receiver. Set the generator
to a pure white signal, chroma off.
5. Set Factory menu registers #40, #41, and #42 to
adjust cutoff controls.
6. Carefully observe which color is predominant on the
CRT: Red, Green or Blue. Do not change the value of
cutoff control of this color.
7. Adjust the other two cutoff controls to obtain color
balance on the screen.
8. Select the color bars pattern from the Video generator and turn the chroma off. Check that the TV set
displays 3/4 of gray scale from white to black. If
black level is too high, readjust register #27, RF
Brightness. Set #28 Aux Brightness equal to RF Brt.
9. Return the color level control to preset.
10.Disable the factory menu (Factory Mode item 0 must
be set to 0). Select “Preset” in the Video Menu under picture preference.
SWITCHING PROCESS
Video switching is done between the CV inputs and
the Y/C inputs. There are three CV signals to consider:
CAMPORT VIDEO enters at V2 (pin14).
REAR VIDEO enters at V1 (pin7).
If Video enters at TV (pin5).
These signals exit from VOUT1 (pin46) to be processed
and returned to the switch as Y/C signals (Y-COMB and
C-COMB).
The second part of the switching is between:
Y/C COMB signals enter at YIN1/CIN2 (pins 42 & 44)
and Y/C EXT signals entering at Y2/C2 (pins 16 & 18).
The selected Y/C signals exit from YOUT1/COUT1 (pins
1 & 3) to be sent to the video processor as main signals. To provide a SYNC signal for the video processor,
the YMAIN signal is also sent to TV/IN (pin 37 - ICX2200).
Closed caption is achieved by taking a signal from the
VSW-OUT pin (41) of the video processor. This means
that the video processor’s internal switch MUST ALWAYS
be pointing to the TV IN option.
S-Video monitor output (Y/C Outputs) is taken from
the CXA2089 through YOUT1/COUT1 (pins 1 & 3). Using two buffers, the S-Video output is always active
and it shows whatever the CRT is showing (MAIN Y/C).
SR24 - 923-035083-4CL - SERVICING
Page 29
IF
Tuner
SAW Filter
To
Video
Output
Board
221-1165
7
PIFIN
8
2
I C
SCL
27
SDA
28
19
ROUT
GOUT
20
21
BOUT
“CAMPORT” JK PK inputs
VRL
“REAR” JK PK inputs
V
R
Main Board (9-2206/9-2208)
TA1268
47
TV/DET
C-IN
45
43
Y-IN
Y-Main for Sync
37
TV/IN
41
VSW-OUT
14
FBLNK
ROSD
15
GOSD
16
BOSD
17
L
SERVICE ADJUSTMENTS (continued)
VIDEO PROCESSING & SWITCHING WITH Y/C INPUT/OUTPUT
Audio
Trap
C-MAIN
Y-MAIN
Y-Main for MICRO
Video Sense Line
Micro
Processor
223-45
COMB FILTER
Daughter Board (9-2207)
Video Switch
CXA2089 SONY
221-01438
TV
5
C-SW
COUT1
3
Y-SW
YOUT1
1
2
I C
SDA
33
SCL
32
VOU1
YIN1
CIN1
Y2
C2
S-2
V1
V3
CV
46
42
44
16
18
20
7
21
SW
Y
VIDEO CAMPORT
COMB
3.58 T
C
COMB
CV
EXT
3.58 BPF
Y
EXIT
C
EXIT
CHROMA-MONITOR-OUT
LUMA-MONITOR-OUT
Y/C IN
YC SENSE LINE
Y/C OUT
SENSING AND PRIORITIES
CL-Series 34, 35, & 39 models do not have a source menu.
Switching between sources is done by software sensing
the inputs based on their priorities.
The camport input always has first priority, it is sensed
directly through the microprocessor. The S-Video input
has the second level. The Y/C connector does the S-Video
sensing. The third level corresponds to rear video and
antenna signal (RF), they would be selected by remote
control.
SR24 - 923-035083-5CL - SERVICING
Page 30
SERVICE ADJUSTMENTS (continued)
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.
6. Check for proper yoke tilt setting.
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 topdead-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.
Wedges' Adhesive Tape (3)
Deflection Yoke
Purity & Convergence
Magnet Assembly Unit
6 Pole
Purity Magnet
4 Pole
Yoke's Glass Cloth Tape
Rubber Wedges (3)
SR24 - 923-035083-6CL - SERVICING
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
B
OR
RR
OR
R
B
B
OR
R
B
OR
B
B
R
B
R
R
BR
Page 31
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 horizontal 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 949-00050). 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.
X
2" To 3"
MAGNET
Clamp and Screw
6 Pole Magnets
2 Pole Magnets
4 Pole Magnets
SR24 - 923-035083-7CL - SERVICING
Page 32
- 3-8 -
Page 33
SECTION 4
MODEL PARTS
MODEL PARTS
PARTS
All CL models are module level repair only. Parts contact
information is below.
Voice: 1-888-3-ZENITH
Fax:1-888-6-ZENITH
Mail:ZENITH NATIONAL PARTS
P O Box 240007
Huntsville, AL 35824-6407
H20E35DT
014-11976-02 Cabinet Tray
014-12048-P09 Cabinet Rear
014-12056-P59 Cabinet Front
020-04330-31 Coil, Degausser
124-00213-03A Space Command Transmitter
152-00335Wedge, Yoke Spacer/Positioner
192-00889Crystal Window, IR
206-03749Instr Book, Operation & Installation,
A-07690-P08Magnet Assembly, Static Convergence and P
A-14323Balun Assembly
A-18682-01Power Cord Ass’y
A-18693-03CRT Assembly with Deflection Yoke
A-18695-20Gnd Strap Ass’y, CRT
A-19097-P01PC Board Ass’y, Jackpack, Camport Front
F-53386Keyboard Ass’y, 10 Key with LED and IR
P009-02277Module, Main, 20V with MTS/FM
P049-01369-03 Speaker, Oval, 6 X 9 cm
P050-02864Connector & Cable Assembly, Speaker
Interconnect
PA-19410Convergence Helper
HW20E35DT
014-11976-02 Cabinet Tray
014-12048-P09 Cabinet Rear
014-12056-P59 Cabinet Front
020-04330-31 Coil, Degausser
152-00335Wedge, Yoke Spacer/Positioner
192-00889Crystal Window, IR
A-07690-P08Magnet Assembly, Static Convergence and P
A-14323Balun Assembly
A-18682-01Power Cord Ass’y
A-18693-03CRT Assembly with Deflection Yoke
A-18695-20Gnd Strap Ass’y, CRT
A-19097-P01PC Board Ass’y, Jackpack, Camport Front
F-53386Keyboard Ass’y, 10 Key with LED and IR
P009-02277-01 Module, Main, 20V with MTS/FM
P049-01369-03 Speaker, Oval, 6 X 9 cm
P050-02864Connector & Cable, Assembly, Speaker
049-01368-07 Speaker, Oval, 6 X 13 cm
095-04531Transformer, Deflection Yoke
124-00213-18 Space Command Transmitter, TV only SC652Z
152-00335Wedge, Yoke Spacer/Positioner
192-00916Lens, IR
206-03745Instr Book, Operation & Installation
6334V27001BCPT, A63AFW36X 0.5Gaus Philip
A-07690-P08Magnet Assembly, Static Convergence and P
A-14323Balun Assembly
A-18682-01Power Cord Ass’y
A-18695-P23Gnd Strap Ass’y, CRT
A-19092-P02Jack Assembly, 3 Phono, Front Panel
F-53646Keyboard Ass’y, 10 Key, With Tall IR
P009-02275Module, Main, Cl 25V Mono No MPI
P014-12365-01 Cabinet Front
P014-12366-01 Cabinet Rear
P020-04330-45 Coil, Degausser
P030-01538Decorative Item
P050-02863-01 Connector and Cable Assembly, Speaker
Interconnect
PA-19410Convergence Helper
H27E35DT
014-12254-P12 Cabinet Rear
014-12336-P06 Cabinet Front
030-01532-01 Decorative Item, Logo, Zenith
049-01368-07 Speaker, Oval, 6 X 13 cm
050-02361-02 Connector and Cable Assembly, CTV Yoke
124-00213-18 Space Command Transmitter, TV only SC652Z
192-00916Lens, IR
206-03751Instr Book, Operation & Installation