Hitachi pa0139 schematic
+,7$&+,
CC
PA
No. 0139
27UX01B-501
SERVICE MANUAL
27UX01B-511
NA8 CHASSISNTSC
R/C:
CLU-432UG
CAUTION: Before servicing this chassis, it is important that the service technician read the “Safety
Precaution” and “Product Safety Notices” in this Service Manual.
This television will display television Closed
Captioning ( or ) in accordance
with paragraph 15.119 of the FCC rules.
CONTENTS
SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
PRODUCT SAFETY NOTICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
POWER SOURCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
SERVICE NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
CIRCUITS AND BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . 34
PARTS IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
SOLID STATE COLOR TELEVISION
JUNE 2000 HHEA-MANUFACTURING DIVISION
SAFETY PRECAUTIONS
NOTICE: Comply with all cautions and safety-related
notes located on or inside the cabinet and on the chasis or
picture tube.
WARNING: Since the chasis of this receiver is connected
to one side of the AC power supply during operation,
whenever the receiver is plugged in, service shoul d not be
attempted by anyone unfamiliar with the precautions
necessary when working on this type of receiver.
The following precautions should be observed:
1. Do not install, remove, or handle the picture tube in any
manner unless shatterproof goggles are worn. People
not so equipped should be kept away from the picture
tube while handling.
2. When service is required, an isolation transformer
should be inserted between power line and the receiver
before any service is performed on a “HOT” chassis
receiver.
3. When replacing a chassis in the receiver, all protective
devices must be put back in place, such as barriers,
nonmetallic knobs, adjustment and compartment
covershields, isolation resistors, capacitors, etc.
4. When service is required, observe the original lead
dress in the high voltage circuitry area.
Leakage Current Hot Check
Plug the AC cord directly into a 120V AC 60Hz outlet (do
not use an isolated transformer for this check). Turn the
AC power ON. Using a Leakage Current Tester
(Simpson’s Model 229 or equivalent), measure for current
from all exposed metal parts of the cabinet (antennas,
screwheads, overlays, control shafts, etc.). Any current
measured must not exceed 0.5 milliamps.
(READING
SHOULD NOT BE
ABOVE 0.5mA)
DEVICE
UNDER
TEST
EXPOSED METAL
2-WIRE CORD
ALSO TEST WITH
PLUG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED)
TEST ALL
SURFACES
LEAKAGE
CURRENT
TESTER
+-
EARTH
GROUND
5. Always use the manufacturer’s replacement
components. Critical components as indicated on the
circuit diagram should not be replaced by another
manufacturer’s. Furthermore, where a short circuit has
occurred, replace those components that indicate
evidence of overheating.
6. Before returning a serviced receiver to the customer, the
service technician must thoroughly test the unit to be
certain that it is completely safe to operate without
danger of electrical shock, and be sure that no
protective device built into the receiver has become
defective, or inadvertently defeated during servicing.
Therefore, the following checks should be performed for
the continued protection of the customer and service
technician.
Leakage Current Cold Check
With the AC plug removed from the 120V AC 60Hz source,
place a jumper across the two plug prongs. Turn the AC
power switch ON. Using an insulation tester (DC500V),
connect one lead to the jumpered AC plug and touch the
other lead to each exposed metal part (antennas,
screwheads, metal overlays, control shafts, etc.),
particularly any exposed metal part having a return path to
the chassis should have a minimum resistor reading of
0.24MΩ and a maximum resistor reading of 12MΩ. Any
resistance value below or above this range indicates an
abnormality which requires corrective action. An exposed
metal part not having a return path to the chassis will
indicate an open circuit.
AC LEAKAGE TEST
ANY MEASUREMENTS NOT WITHIN THE LIMITS
OUTLINED ABOVE ARE INDICATIVE OF A
POTENTIAL SHOCK HAZARD AND MUST BE
CORRECTED BEFORE RETURNING THE
RECEIVER TO THE CUSTOMER.
High voltage
This receiver is provided with a hol d down circuit for clearly
indicating that voltage has increased in excess of a
predetermined value. Comply with all notes described in
this service manual regarding this hold down circuit when
servicing, so that this hold down circuit is operated
correctly.
Serviceman Warning
With minimum BRIGHTNESS, CONTRAST,
SHARPNESS, and COLOR, the operating high voltage in
this receiver is lower than 28.30kV ±1.25kV. In case any
component having influence on the high voltage is
replaced, confirm that high voltage with minimum
BRIGHTNESS, CONTRAST, SHARPNESS, and COLOR
is lower than 28.30kV ±1.25kV. To measure high voltage
use a High Impedance High Voltage meter. Connect (-) to
chassis earth and (+) to the CRT ANODE button. (See the
connection diagram on page 4.)
Note: Turn power switch OFF without fail before the
connection to the Anode Button
- 2 -
Important Safety Notice . . . . . . . . . . . . . . . . . . 2
Safety Precautions . . . . . . . . . . . . . . . . . 2
Product Safety Notice . . . . . . . . . . . . . . . . . . . . 4
Horizontal Oscillator Disable Circuit . . . . 5
Receiver Feature Table . . . . . . . . . . . . . . . . . . . 6
Location of Controls (Receiver)
Receiver Front Control Panel . . . . . . . . . 7
Location of Controls (Remote). . . . . . . . . . . . . 8
Disassembly for Service. . . . . . . . . . . . . . . . . 15
Disassembly for CRT Replacement . . . . . . . . 15
Chassis Service Adjustment Procedures . . . 16
131.0V B+ Voltage Confirmation . . . . . 16
Source Voltage Chart . . . . . . . . . . . . . . 16
B+ 5V Source Voltages. . . . . . . . . . . . . 16
MPU 5V . . . . . . . . . . . . . . . . . . . . . . . . 16
Stand-by 5V . . . . . . . . . . . . . . . . . . . . . 16
B+ 9V Source Voltage . . . . . . . . . . . . . 16
B+ 12V (Stand-by) . . . . . . . . . . . . . . . . 16
High Voltage Check . . . . . . . . . . . . . . . 16
Purity and Convergence Procedures . . . . . . 17
Service Adjustments
(Electronic Control). . . . . . . . . . . . . . . . . . 30
Sub-Brightness. . . . . . . . . . . . . . . . . . . 30
Sub-Contrast. . . . . . . . . . . . . . . . . . . . . 30
Tint/Color Adjustment . . . . . . . . . . . . . . 30
Color Temperature Adjustment. . . . . . . 31
Horizontal Centering. . . . . . . . . . . . . . . 32
MTS Circuit Adjustment . . . . . . . . . . . . 32
Clock Adjustment (S7) . . . . . . . . . . . . . 33
Vertical Size . . . . . . . . . . . . . . . . . . . . . 33
Service Adjustments
(Mechanical Controls). . . . . . . . . . . . . . . . 33
Focus (Part of T551). . . . . . . . . . . . . . . 33
Audio Signal Path Block Diagram . . . . . . . . . 34
Video-Chroma Signal Path
Block Diagrams. . . . . . . . . . . . . . . . . . . . . 35
IC101 VCJ IN/OUT Pins and Functions . . . . . 36
IC001 MPU IN/OUT Pins and Functions. . . . . 37
Component Identification . . . . . . . . . . . . . . . . 38
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Serviceman Mode (Electronic Controls) . . . . 20
Entering Serviceman Mode . . . . . . . . . 20
Toggle between Modes. . . . . . . . . . . . . 20
Exiting the Serviceman Mode. . . . . . . . 20
Sub-Data Adjustment . . . . . . . . . . . . . . 21
Cut-Off Adjustment. . . . . . . . . . . . . . . . 21
Pin Cushion Adjustment . . . . . . . . . . . . 22
MTS Adjustment. . . . . . . . . . . . . . . . . . 22
PIP Adjustment. . . . . . . . . . . . . . . . . . . 23
Options Adjustment . . . . . . . . . . . . . . . 24
Comb Filter Adustment. . . . . . . . . . . . . 25
To Check Purity . . . . . . . . . . . . . . . . . . 26
Helpful Hints . . . . . . . . . . . . . . . . . . . . . 26
Instructional Flow Chart
for Serviceman Mode . . . . . . . . . . . . . . . . 27
- 3 -
PRODUCT SAFETY NOTICE
HIGH
IMPEDANCE
H.V. METER
CRT ANODE
+-
CHASSIS
GROUND
CRT
Many electrical and mechanical parts in HITACHI
television receivers have special safety-related
characteristics. These are often not evident from visual
inspection nor can the protection afforded by them
necessarily be obtained by using replacement components
rated for higher voltage, wattage, etc. Replacement parts
which have these special safety characteristics are
identified in this Service manual.
Electrical components having such features are identified
with a mark in the schematics and parts list in this
!
Service Manual.
The use of a substitute replacement component which
does not have the same safety characteristics as the
HITACHI recommended replacement component, shown
in the parts list in this Service Manual, may create shock,
fire, X-radiation, or other hazards.
Production safety is continuously under review and new
instructions are issued from time to time. For the latest
information, always consult the current HITACHI Service
Manual. [A subscription to, or additional copies of
HITACHI Service Manuals may be obtained at a nominal
charge from HITACHI Sales Corporation.]
This Service Manual is intended for qualified service
technicians; it is not meant for the casual do-it-yourselfer.
Qualified technicians have the necessary test equipment
and tools, and have been trained to properly and safely
repair complex products such as those covered by this
manual. Improperly performed repairs can adversely
affect the safety and reliability of the product and may void
warranty. Consumers should not risk trying to do the
necessary repairs and should refer to a qualified service
technician.
WARNING
Lead in solder used in this product is listed by the California
Health and Welfare agency as a known reproductive
toxicant which may cause birth defects or other
reproductive harm (California Health and Safety Code,
Section 25249.5).
When servicing or handling circuit boards and other
components which contain lead in solder, avoid
unprotected skin contact with solder. Al so, when soldering
do not inhale any smoke or fumes produced.
SAFETY NOTICE
USE ISOLATION TRANSFORMER
WHEN SERVICING
X-Radiation
TUBE: The primary source of X-Radiation in this receiver
is the picture tube. The tube utilized in this chassis is
specially constructed to limit X-Radiation emissions. For
continued X-Radiation protection, the replacement tube
must be the same type as the original HITACHI-approved
type.
When troubleshooting and making test measurements in a
receiver with excessive high voltage problem, avoid being
unnecessarily close to the picture tube and high voltage
components.
Components having special safety characteristics
identified by on the parts list in this service manual and
!
its supplements and bulletins. Before servicing this
product, it is important that the service technician read and
follow the “Safety Precautions” and the “Product Safety
Notices” in this Service Manual.
For continued X-Radiation protection, replace picture tube
with original type or HITACHI equivalent type.
POWER SOURCE
This television receiver is designed to operate on 120Volt/
60Hz, AC house current. Insert the power cord into a
120Volts/60Hz outlet.
NEVER CONNECT THE TV TO OTHER THAN THE
SPECIFIED VOLTAGE OR TO DIRECT CURRENT.
Do not operate the chassis longer than is necessary to
locate the cause of excessive voltage.
- 4 -
Service Notes
IMPORTANT: To protect against possible damage to
the solid state devices due to arcing or static
discharge, make certain that all gro und wires and CRT
DAG wire are securely connected.
Equipment needed to check the disabled circuit:
1. Voltmeter (0 - 200V scale)
2. High Voltage Meter (0- 50kV)
CAUTION: The power supply circuit is above earth
ground and the chassis cannot be polarized. Use an
isolation transformer when servicing the Receiver to
avoid damage to the test equipmen t or to the chassis.
Connect the test equipment to the proper ground ( ) or
( ) when servicing, or incorrect voltages will be
measured.
WARNING: This Receiver has been designed to mee t
or exceed applicable safety and X-ray radiation
protection as specified by government agencies and
independent testing laboratories.
To maintain original product safety design standards
relative to X-ray radiation and shock and fire hazard,
parts indicated with the s ymbol
must be replaced with identical parts. Order parts from
the manufacturer’s parts center using the parts
numbers shown in t his service manual, or provide the
chassis number and the part reference number.
For optimum performanc e and reli ability, all other parts
should be replaced with components of
identical specification.
on the schematic
!
Horizontal Oscillator Disable Circuit
3. Variac or Isolation Transformer
Procedure:
1. Tune in a station to verify that the horizontal is
in sync.
2. Obtain a Monoscope pattern or a signal generator
crosshatch pattern
3. Turn the Receiver OFF. Connect a jumper across
IC803 pin 3 and pin 4. Apply +9V DC to cathode of
D001.
4. Reduce the AC supply voltage to approximately
45V. Connect the high voltage meter to the CRT
anode. (H.V. button).
Note: Use the Dag Ground (C10 on the CRT Board)
to connect the (-) lead of the meter.
5. Turn the Receiver ON. Slowly increase the AC
supply voltage and verify that the high voltages
does not exceed 37.1kV, when horizontal just
begins to pull ou t of sync . If the hig h voltage is not
within the specified limit, the cause must be
determined and corrected before the Receiver is
returned to the customer.
This chassis employs a special circuit to protect
against excessive high voltage and beam current. If, for
any reason, the high voltage and beam current e xc ee d
a predetermined level this protective circuit activates
and detunes the horizontal oscillator that limits the high
voltage. The over-voltage protection circuit is not
adjustable. However, if components indicated by the
symbol
sweep system or the over-voltage protection circuit
itself are changed, the operation of the circuit should
be checked using the following procedure:
on the schematic in either the horizontal
!
- 5 -
Receiver Feature Table
FEATURE\MODEL
Chassis NA8
Tuning system 96K
# of channels 181
Menu language Eng/Span/Fr
Closed Caption X
V-Chip X
75 Ω input X
Picture in Picture 2T
Remote Model # HL01423
Picture tube M68LGLO61X
V/A norm (X=both) X
MTS/SAP/DBX X
Volume Correction X
Built-in audio power 5Wx2 (10%)
# of speakers 2
A/V in (rear/front) 3(2/1)
Dimensions mm
(HxWxD) in
27UX01B-501
27UX01B-511
594.8x665.2x544.5
23.4x26.1x21.4
Weight (kg/lbs) 38/83.6
Power source (V/Hz) 120/60
Anode voltage
Video input jack
Audio input jack 500mV RMS 47kΩ
A-Board TNP2AH017 AE
C-Board TNP2AA047 AP
S-Board TNPA0190 AL
Y-Board TNPA1059 BC
28.30kV ±1.25kV
75Ω, phon o jack
1V
p-p
Table 1. Receiver Features
Specifications are subject to change without notice or obligation.
Dimensions and weights are approximate.
- 6 -
Location of Controls (Receiver)
1 2 3 4 5 6
Figure 1. Location of Controls Receiver
Quick Reference Control Operation
Quick Reference
Control Operation
1
Power Button - Press to turn ON or OFF.
Volume Buttons - Press to adjust Audio Level, or to adjust Audio Menus, Video
2
Menus, and select operating features when menus are displayed
Channel Buttons - Press to selec t programmed c hannels. Pres s to highlight de sired
3
features when menus are displayed.
Menu Button - Press to display Main Menu and access On Screen feature and
4
Adjustment Menus.
5
Input Button - Press to select TV or one of two Video Inputs.
6
AV Input - AV and earphone jacks.
- 7 -
Location of Controls (Remote )
e
0
s
Power Button
Press to turn ON or OFF.
PIP Buttons
Press to control PIP features.
PIP CH Buttons
Press to select PIP channels.
Menu Button
Press to display main menu and
access or exit onscreen features
and adjustment menus.
Mute Button
Press to mute audio (Closed Caption
appears, if available). A second press
resumes audio (Closed Caption will not
be displayed).
V olume Buttons
Press to adjust TV audio level.
Mode Buttons
Set remote to control your TV,
cable box, satellite dish, DVD or
VCR.
TV/VCR Button
When controlling t he TV or VCR,
this switches TV/VCR. When
controlling cable, this switche
between A and B.
Cursor Button
Press to adjust audio menus,
video menus and select operati ng
features.
Exit Button
Press to exit selection and
adjusting menus.
Lst-Ch (Last Channel) Button
Press to switch to the previous
channel.
Channel Button
Press to select channels.
Keypad Buttons
Press desired channel number to
randomly access any channel.
Input Button
Press to select TV or video input.
CLU- 432UG
Figure 2. Location of Controls (Remote)
- 8 -
Sleep Button
Press to turn TV off in 30, 60 or 9
minutes.
Precoded VCR/DVD Buttons
These buttons transmit th
chosen precoded VCR/DVD
codes.
Remote Control Quick Reference Functional Key Chart
POWER
PIP CH
Key Operates Function
TV
VCR
DVD
CABLE
SATELLITE
T urns On and Off selected components
TV
CBL/SAT
VCR/DVD
PIP
SWAP
MOVE
FREEZE
TV/VCR
TV TV mode selection for remote control
CABLE
SATELLITE
VCR
DVD
TV
Cable mode selection for remote control
Satellite mode selection for remote control
VCR mode selection for remote control
DVD mode selection for remote control
Displays the PIP frame, press button once
more, and PIP frame becomes smaller
TV Switches PIP and Main picture source
TV
Moves the PIP frame to one of four corners
of Main picture
TV Freezes the PIP picture
TV Selects channels for the PIP frame
TV
VCR
CABLE
Selects TV or VCR mode
Selects TV or VCR mode
Selects A/B
MENU
EXIT
LST-CH
MUTE
VOL
TV
Menu navigation
TV Access and Exits menus
TV Exits selection and adjusting menus
TV Returns to previous channel
TV Mutes TV Audio
TV Volume up/down
- 9 -
Key Operates Function (Continued)
1
4
7
2
5
8
3
6
9
0
TV
CH
KEYPAD BUTTONS
CABLE/
SATELLITE
Channel up/down for main picture
Channel up/down
INPUT
SLEEP
TV
VCR
DVD
CABLE/
SATELLITE
TV Selects input mode
TV Selects SLEEP timer menu
VCR
DVD
VCR
DVD
VCR
DVD
Selects channel
Selects channel
Selects channel
Rewind
Play
Fast forward
REC
CS
RECALL
VCR
DVD
VCR
DVD
VCR
DVD
VCR
DVD
VCR
DVD
Record
Stop
Pause
Not used for this model
Displays channel, time, channel I.D. and
audio mode
- 10 -
Programming the Remote
VCR Functions
This remote is design ed to operate different brands of VCRs. You must first program the remo te to match the
remote system of your VCR.
Procedure
1. Turn ON your VCR.
2. Aim the remote control at the front of your VCR.
3. While holding down the VCR bu tton on the remote, enter the 2-digit preset code that matches your VCR.
(See “Component Code s” on page 12~ page 14.) The rem ote will turn off your VCR wh en the correct 2
digit preset code is entered. When this occurs, the remote control is programmed for your VCR. If the VCR
does not turn off after 25 seconds, try a different code, if available.
4. The remote will now control your VCR.
Notes
• If yo ur VCR will not operate remotely after per forming the above procedures, this m eans that your
VCR’s code has not been coded into the remote. Please consult your VCR’s operating guide.
• The remote control will remember the codes you have programmed in until the batteries are removed
from the remote control. After replacing the batteries repeat the programming procedure stated
above.
• If your VCR does not have a remote power function, the remote will issue the CHANNEL UP function.
•The MENU button will act as the VCR MENU button for HITACHI VCRs.
•The INPUT button will act as your VCR +100 button, if required.
Cable/Satellite Box Functions
This remote is designed t o opera te di fferent bran ds of cab le boxes and Satellite boxes. You must first program the
remote to match the remote system in your cable/satellite box.
Procedure
1. Turn ON your cable/satellite box.
2. Aim the remote control at the front of your cable/satellite box.
3. While holding do wn the CABLE button on the remote, en ter the 2 digit preset code (See “C omponent
Codes” on page 12 ~ page 14) that matches your cable/s atellite box. The remote wil l turn off your cable/
satellite box when the correct 2 digit code is entered. When this occurs, the remote control is programmed
for your cable/satel lite box. If the ca ble/satellite box does not turn off after 5 secon ds, try another 2 digi t
preset code, if available.
4. The remote will now control your cable/satellite box.
Notes
• If your cable/satellite box will not operate remotely after performing the above procedures, this means
that your cable/satel lite box code has not bee n coded into the remo te. Please consult your cable/
satellite box operating guide.
• The remote control will remember the codes you have programmed in until the batteries are removed
from the remote control. After replacing the batteries, repeat the entire programming procedure stated
above.
• If your cable/satellite box does not have a remote power function, the remote will issue the CHANNEL
UP function.
Write the code numbers from tables in this space. This
will serve as a reference if you need to program your
remote control.
CABLE/SATELLITE BOX VCR
- 11 -
Component Codes
The remote control is capable of operating many brands of VCRs and cable/satellite boxes. You must first program
the remote control to match the remote system in your VCR or cable/satellite box.
Some models of VCRs or cable/satellite boxes may not remotely operate because the codes are not available due
to limited memory. The remote control is not designed to control all features that are available in all models.
VCR
Brand Code
Adventura 00
Aiko 50
Aiwa 00
Akai 14, 23, 49
American High 09
Asha 48
Audiovox 10
Beaumark 48
Bell & Howell 30
Brandt 38
Broksonic 33, 37, 43, 51, 52
Calix 10
Canon 09
Capehart 05
Carver 28
CCE 27, 50
Citizen 10, 50
Colt 27
Craig 10, 19, 27, 48
Curtis Mathes 09, 14, 22
Cybernex 48
Daewoo 03, 05, 17, 29, 50
Dayton 05
Dynatech 00
Electrohome 10
Electrophonic 10
Emerex 06
Emerson
Fisher 19, 21, 25, 30
Fuji 07, 09
Funai 00
Garrard 00
GE 09, 22, 24, 39
Goldstar 04, 10, 11
Gradiente 00
Harley Davidson 00
Harmon/Kardon 11
Harwood 27
Headquarter 18
HI-Q 19
Hitachi 14, 15, 24, 31
Jensen 14
00, 01, 10, 16, 23, 33, 37, 40, 41, 43, 44,
50, 51, 52,
Brand Code
JVC 02, 14, 26
KEC 10, 50
Kenwood 11, 14, 26
KLH 27
Kodak 9, 10
Lloyd 00
Lloyd’s 40
Logik 27
LXI 10
Magnavox 09, 12, 28, 32, 34
Magnin 48
Marantz 09, 28
Marta 10
Matsushita 09
MEI 09
Memorex 00, 09, 10, 12, 18, 19, 20, 30, 48
MGA 16, 23
MGN T echnology 48
Minolta 15, 23
Mitsubishi 16, 23, 26, 36, 49
Motorola 09, 20
MTC 00, 48
Multitech 00, 27
NEC 11, 13, 14, 26, 30
Nikko 10
Noblex 48
Olympus 09, 47
Optimus 10, 20, 30
Orion 51
Panasonic 09, 35, 46, 47, 53
J.C. Penney 09, 10, 11, 13, 15, 21, 48
Pentax 15, 24, 31
Philco 09
Philips 09, 28, 32
Pilot 10
Pioneer 26
Portland 05
Portec 27
Pulsar 12
Quarter 18
Quartz 18
Quasar 09
Radio Shack 00, 10
- 12 -
Brand Code
Brand Code
Radix 10
Randex 10
RCA 15, 22, 24, 31, 34, 39
Realistic 00, 09, 10, 18, 19, 20, 25, 30, 48
Ricoh 08
Runco 12
Samsung 17, 48
Sanky 12, 20
Sansui 14, 26
Sanyo 18, 19, 30, 48
Scott 16, 17, 33, 37, 43, 44
Sears 09, 10, 15, 18, 19, 21, 25, 30, 31
Sharp 20
Shintom 27
Shogun 48
Singer 27
Sony 06, 07, 08, 09
STS 15
Sylvania 00, 09, 16, 28, 32
Symphonic 00
Tatung 14
Teac 00, 14
Technics 09, 35
Teknika 09, 35
Telefunken 00, 09,10
TMK 38
Toshiba 40, 48
Totevision 16, 17, 25, 44
Unitech 10, 48
Vector 48
Vector Research 17
Video Concepts 11, 13
Videosonic 13, 17, 23
Wards 00, 09, 15, 19, 20, 22, 27, 34, 44, 48
XR-1000 27, 34, 44, 48
Yamaha 11
Zenith 07, 08, 12
SATELLITE
Brand Code
General
Instrument
Jerrold 61, 62
Primestar 61, 62
RCA 60
Sony 63
Brand Code
Hitachi 00
Megatron 00
Brand Code
ABC 01, 03, 05, 06, 09, 11, 12, 14, 30
Antronix 44
Archer 28, 40, 44
Belcor 31
Cable Star 31
Century 40
Citizen 40
Colour Voice 19, 25
Comtronics 29, 34
Contec 15
61
TV
CABLE BOX
Brand Code
Dae Ryung 06
Eastern 02
Electricord 37
Everquest 13
Focus 57
Garrard 40
GC Electronics 31, 44
Gemini 13, 32, 36, 46
General
Instrument/
09, 51
- 13 -
Brand Code
Brand Code
Goldstar 29, 39
Hamlin 08, 16, 27, 49, 50
Hitachi 09
Hytex 05
Jasco 40
Jerrold 03, 09, 10, 12, 13, 30, 51
Macom 26
Magnavox 21
Memorex 00
Movie Time 35, 37, 42
NSC 35, 36, 42
Oak 05, 15, 47
Panasonic 00,17, 38
Paragon 00
Philips 19, 21, 22, 23, 24, 25, 40, 46, 54
Pioneer 18, 39, 65
Popular
Mechanics
Pulsar 00
RCA 17
Realistic 44
Recoton 57
Regal 16, 49, 50, 53
Regency 02
Rembrandt 09, 36
Runco 00
57
Samsung 29, 39
Scientific Atlanta 04, 06, 14, 52
Signal 13, 29
Signature 09
SL Marx 29
Sprucer 17, 55
Starcom 03, 13, 30
Stargate 13, 29
Starquest 13
Starsight 58, 59
Sylvania 01
Teleview 29
Texscan 01
Tocom 10, 11, 33
Toshiba 00
Tusa 13
TV86 35
Unika 40, 44
United Artists 05
United Cable 03
Universal 28, 31, 37, 40, 43, 44
Videoway 48
Viewstar 21, 34, 35, 45
Zenith 00, 64
Zentek 57
- 14 -
Disassembly for Service
Disassembly for CRT
Back Cover
Remove all the screws marked with an arrow( )
from the back of the Receiver.
Note: Screw configuration, type, and number of
screws vary depending on the model of the
Receiver serviced and the app lication; various
models are covered in this Manual. Us e same
hardware when reassembling the receiver.
• 3 screws at the top edge of the Receiver.
• 1 screw at each lower corner of the Receiver.
• 1 screw by the retainer plate of the AC power cord.
• 1 screw by the Flyback assembly.
• 1 screw by the A/V jacks.
• 1 screw by the VAO OUT jacks.
A-Board - Main Chassis
1. Slide the chassis completely out of the guide rails.
2. Stand the Receiver on its edge. The underside o f
the board is completely accessible for component
replacement.
Note: Some tie-wraps that s ecure the wire dressi ngs
may need to be unfastened for chassis
removal.
C-Board - CRT Output
Plugs into the socket on the CRT neck.
Y-Board - PIP Processing
Plugs into the A-Board.
S-Board - Second Tuner
Slides into left side of chassis.
Speakers
Each speaker is secured to the cabinet’s front with
4 screws.
Keyboard Push Button Assembly
Fastened to the inside of the cabinet front with up
to 3 screws.
Replacement
1. Discharge the CRT as instructed in the Safety
Precautions (see page 2).
2. Disconnect the yoke (DY) plug, degaussing coil
(DEG) plug and the CRT 2nd anode button from
the main board.
3. Remove the C-Board from the CRT base and
unplug the black wire (CRT dag ground) C10.
4. Disconnect the A11, A12, and Speakers plugs from
the A-Board.
5. Lift the Main Chassis (A-Board) and all mounted
boards completely out with the CRT Board attached.
CRT Replacement
1. Perform Disassembly for CRT Replacement
procedure.
2. Insure that the CRT H.V. Anode button is
discharged before handling the CRT. Read the
Safety Precautions (see page 2) on handling the
picture tube.
3. Remove the components from the CRT neck and
place the cabinet face down on a soft pad.
4. Note the original order for the CRT mounting
hardware as they are removed from the CRT
mounting brackets at each corner of the CRT.
5. Remove the CRT with the dega ussing co il and th e
dag ground braid attached.
6. Note the original locations and mounting of the
degaussing coil and the dag ground assembly to
insure proper reinstallation on the replacement
CRT.
To remove and re-mount the degaussing coil:
The degaussing co il is held in place by clampers
fastened to the CRT corner ears. These c lampers
must be installed onto th e replacement CRT prior
to mounting the degaussing coil.
To remove and re-mount the dag ground braid:
a. Unhook the coil spring from the bottom corners
of the CRT ears.
b. Releas e the braid loop fr om the upper corne rs
of the CRT ears.
7. Mount the dag ground braid on the replacement
CRT. Position the degaussing coil with new ties.
Dress coil as was on the original CRT.
8. Replace the components on CRT neck and
re-install into cabinet. Verify that all ground wires
and circuit board plugs get connected.
- 15 -
Chassis Service Adjustment Procedures
All service adjustments are factory preset and should not require adjustment unless controls and/or
associated components are replaced.
Note: Connect the (-) lead of the voltmeter to the appropriate ground. Use IC803’ s heat sink when the HOT ground
symbol ( ) is used. Otherwise, use COLD ground ( ) — Tuner shield, IC451’s heat sink or FA2.
IC 002
A31
A32
IC 6501
IC 001
164
32 33
A11
152
T
U
N
E
R
26 27
FA1
DAT A
TP15
CLK
FA2
IC 101
TP
SP
IC 551
IC 552
IC 2302
Figure 3. A-Board
Main Components
and Test Points
IC 4402
A61
IC 2321
A-BOARD
COLD ( )
HOT ( )
RL801
F801
IC 803
C552
TPD9
TPD8
IC 451
Q501
C809
FOCUS SCREEN
A7
A8
Q551
D554
Viewed from the trace side (bottom of the circuit board)
MOMENTARILY CONNECT A JUMPER FOR ENTERING SERVICE MODE (FA1 to FA2 )
131.0V B+ Voltage Confirmation
1. Set the Bright and the Picture to Minimum by
using the Picture Menu.
2. Connect the DVM between C809(+ sid e) and cold
ground ( ).
3. Confirm that B+ voltage is 131.0V ± 2.5V. This
voltage supplies B+ to the Horizontal Output &
Flyback circuits.
Source Voltage Chart
120V AC line input. Se t the Bright and the Picture to
Minimum by using th e Picture Menu. Use cold ground
(
) for the (-) lead of the DVM.
C572 (+) +5.0V ± 0.25V
TPD9 +13.0V ± 2V
C552(+) +8.0V ± 1V
TPD8 +27.4V ± 2V
IC551 pin3 +9.0V ± 0.5V
Cathode of D554 +220.0V ± 5V
Adjust Picture Menu for normalized video adjustments.
MPU 5V:
Emitter Q002 = IC001 (VDD, AVDD).
Stand-by 5V:
IC001 (key in 1), I2C EEPROM (IC002), Remote
Receiver.
B+ 9V Source Voltage
IC551 pin 3 = IC101 (IF 9V), Tuner (BM).
B+ 12V (Stand- by)
Note: +16V when power is on
Cathode D001 = RL801 (on-off relay), Q002 (+5V
Reg).
High Voltage Check
1. Select an active TV channel and confirm that
horizontal is in sync.
2. Adjust Brightness and Picture using Picture Icon
menu so video just disappears.
3. Confirm B+ 131V is within limit.
4. Using a high voltage meter confirm that the High
Voltage is
28.30kV ±1.25kV .
B+ 5V Source Voltages
Volatile 5V:
C572, + side = IC552 pin 3, Tuner BP, IC101 (IF 5V).
- 16 -
Purity and Convergence Procedure
Adjustment is necessary only if the CRT or the
deflection yoke is replaced or if the setting was
disturbed. The complete procedure consists of:
1. Vertical Raster Shift Adjustment. (Only for Models
with Purity/Convergence Assembly with 4 Pairs
of Rings).
2. Initial static convergence.
3. Setting the purity.
4. Final static convergence.
When the CRT or the Yoke is Replaced
Place the yoke on the CRT neck (do not tighten
the clamp).
For a 2-piece assembly (see Fig. 4):
Position purity/convergence assembly as shown and
tighten clamp snugly. Remove the hot-melt glue seal
on assembly and position like tabs of purity device
together at 12 o’clock to reduce its magnetic field
effect.
R&B Convergence Rings
R&B&G Convergence Rings
G3 G4
Purity Rings Centered
Over G3/G4 Gap
For a 1-piece assembly (see Fig. 7):
Position like tabs of purity devices together at 12
o’clock to reduce any magnetic field effect. (For better
results, note part number and loo k for specifi cations at
Service Center)
Figure 7. Positioning of Purity/Convergence
Assembly (1-piece assembly)
For either assemblies:
Turn the Receiver ON. Operate the Receiver for 60
minutes using the first Purity Check field (white screen)
to stabilize the CRT.
Fully degauss the Receiver by using an external
degaussing coil .
Slide the deflecti on yoke bac k and forth on the nec k of
the CRT until it produces a near white, uniform raster.
Figure 4. Positioning of Purity/Convergence Assembly
(2-piece assembly)
For models using 4 pairs of rings, place the vertical
raster shift tabs at 3 o’clock (90
o
from the purity and
convergence tabs, see Fig. 5 and Fig. 6)
R&B Convergence Rings
R&B&G Convergence Rings
Vertical Raster Shift Ring
G3 G4
Purity Rings Centered
Over G3/G4 Gap
Figure 5. Positioning of Purity/Convergence Assembly
(4 Pairs of Rings)
R&B&G Convergence Rings
R&B Convergence Rings
Vertical Raster
Shift Rings
Purity Rings
90
o
Figure 6. Positioning of Purity/Convergence Assembly
(4 Pairs of Rings)
Vertical Raster Shift Adjustment (Only for
Models with Purity/Convergence Assembly with 4
Pairs of Rings).
Apply a green pattern wi th a horizontal line, a djust the
Deflection Yoke so that has no tilt, then secure it.
Adjust center line of the pattern with the mechanical
center of the CRT, this center is determined by two
marks at the side edges of the screen. To adjust the
line, once the vertical raster shift tabs are place at 3
o’clock to reduce its magnetic field effect (see Fig. 5
and Fig. 6) open the tabs the same angle from the
center, until the center line of the pattern becomes a
straight line, ce ntered with the mar ks of the CRT. (see
Fig. 8)
Center line
from pattern
Mechanical
Center Marks
Vertical Raster Shift tabs
Figure 8. Vertical Raster Shift Adjustment
(4 pairs of rings assembly)
Open the
same angle
from center
- 17 -
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