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Models: 35UX85B/CZ68
Chassis: A6LXU
Service Manual
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SERVICE MANUAL
CAUTION:
Before servicing this chassis, it is important that the service technician read the "Safety Precautions" and "Product Safety Notices" in this Service Manual. This television receiver will display television Closed Captioning (ml or c1> in accordance with paragraph 15.119 of the FCC rules.
TABLE OF CONTENTS
SAFETY PRECAUTIONS .................................................... 2 3 3 4 5 6 TROUBLESHOOTING REPLACEMENT FLOWCHARTS ............................. 25 41 59 PRODUCT SAFETY NOTICE .............................................. POWER SOURCE ............................................................... TECHNICAL SPECIFICATIONS .......................................... PARTS LIST ...........................................
WIRING DRAWING OF FINAL ASS'Y ..............................
PRINTED WIRING BOARD FOIL PATTERN.. ................... 60 CIRCUIT SCHEMATIC DIAGRAM ..................................... 62
TECHNICAL CAUTIONS ..................................................... ADJUSTMENT SPECIFICATIONS ......................................
SPECIFICATIONS
AND PARTS ARE SUBJECTTO
CHANGE
FOR IMPROVEMENT
SOLID STATE COLOR TELEVISION
SEPTEMBER 1996 HHEA - MANUFACTURING DIVISION
A6LXU
SAFETY PRECAUTIONS
NOTICE: Comply with all cautions and safety related notes located on or inside the cabinet and on the chassis or picture tube. WARNING: Since the chassis of this receiver is connected to one side of the AC power supply during operation, whenever the receiver is plugged in, service should 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 the 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. 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 by the manufacturer has become defective, or inadvertently defeated during servicing. Therefore, the following checks shoutd 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 (DCSOOV), 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 0.24MQ and a maximum resistor reading of 12MR . Any resistance value below or above this range indicates an abnormality which requires corrective action. Exposed metal part not having a return path to the chassis will indicate an open circuit. Leakage Current Hot Check
Plug the AC line cord directly into an AC 12OV 6OHz outlet (do not use an isolation 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.) particularly any exposed metal part having a return path to the chassis or to a known earth ground (water pipe, conduit, etc.). Any current measured must not exceed 0.5mA.
F----7
ll\I I
I
TEST ALL EXPOSED SURFACES Z-WIRE CORD I METAL I I
1
(READING SHOULD NOT BE ABOVE 0.5mA)
AI
-G$--.l
I 0' ,I
ALSO TEST WITH PLUG REVERSED (USING AC ADAPTER PLUG AS REQUIRED)
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 hold 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 and CONTRAST, the operating high voltage in this receiver is lower than 37.OKV. In case any component having influence on the high voltage is replaced, confirm that high voltage with minimum BRIGHTNESS and CONTRAST is lower than 37.OKV. To measure high voltage use a high impedance High Voltage Meter. Connect (-) to chassis earth and (+) to the CPT Anode button (See the following connection diagram). NOTE: Turn the power switch OFF without fail before the connection to the Anode button is made.
CPT ANODE \
-T\zi,
CPT
HIGH IMPEDANCE H.V. METER CHASSIS GROUND
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 product and its safety. Consumers should not risk trying to do the necessary repairs and should instead 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 with lead in solder, avoid unprotected skin contact with the solder. Also, when soldering do not inhale any smoke or fumes produced.
PRODUCT SAFETY NOTICE
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. Replacements parts which have these special safety characteristics are identified in this Model Service Manual.
Electrical components having such features are identified with an A mark in the schematics and parts list in this Model Service Manual. The use of a substitute replacement component which does not have the same safety characteristics as the HITACHI recommended replacement one, shown in the parts list in this Model 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 Manual may be obtained at a nominal charge from HITACHI SALES CORPORATION.
SAFETY NOTICE USE ISOLATION TRANSFORMER WHEN SERVICING
Components having special safety characteristics are identified by ,!!!!, on the parts list in this Model Service Manual and its supplements and bulletins. Before servicing this, 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 120 Volts/ 60Hz, AC house current. Insert the power cord into a 120 Volts/GOHz outlet. NEVER CONNECT THE TV TO OTHER THAN THE SPECIFIED VOLTAGE OR TO DIRECT CURRENT.
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 emission. For continued XRadiation 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 an excessive high voltage problem, avoid coming unnecessarily close to the picture tube and the high voltage component. Do not operate the chassis longer than is necessary to locate the cause of the excessive voltage. 3
AGLXU TECHNICAL
Model: Picture Tube: Power Input: Power Consumption: Antenna Receiving Impedance: Channel:
VHF EXT. Mid CATV Mid CATV Super CATV Hyper 35UX85BKZ68 A89AGFll 120 volts Xl 0 AC, 60Hz
SPECIFICATIONS
Audio Output Power:
Front -3 watts 8 ohm impedance. Max output -5 Rear - 5 watts 8 ohm impedance. Max output -5 rms per channel, watts per channel, watts
210 watts-Maximum 155 watts-Operating 75 ohm Unbalanced VHF/UHF/CATV CH 2-13 (A-2)-(A-l), A-l J-W (W+29)-(W+53) 45.75 41.25 42.17
Dimension:
Height (in.) Width (in.) Depth (in.) Weight (Ibs.)
35UX85B
29"132
35
24131zz
266 CPT P.C.B. Signal P.C.B. Signal Sub P.C.B. Power/Deflection P.C.B. Power P.C.B. DF P.C.B. Deflection P.C.B. Control A P.C.B. Control B P.C.B. Surround A P.C.B. Surround B P.C.B. Terminal P.C.B.
4+
Circuit Board Assemblies:
Intermediate Frequency: Video Input: Video Output: Audio Input: Stereo Audio Output:
Picture I-F Carrier Sound I-F Carrier Color Sub Carrier 1 Voltp-p 1 Voltp-p 0.47 75 ohm 75 ohm
MHz MHz MHz
volt rms,
47 k ohm
0.47 volt rms, 1 k ohm
CAUTION The following symbol near the fuse indicates fast operating Example:
fuse (to be replaced).
Fuse ratings appear within the symbol.
F901
The rating of fuse F901 is 6.OA-125V. Replace with the same type fuse for continued
protection
against fire.
A6LXU TECHNICAL
High voltage limiter circuit operation check.
CAUTIONS
Adjustment Preparation 1. Connect a high voltage voltmeter between CPT anode terminal (anode capside) and the ground. 2. Set AC Input voltage to 120+3V. 3. Receive Circle Pattern or broadcast signal and set "BRIGHTNESS" and "CONTRAST" to maximum. Adjust the Screen VR so that Beam Current is I& 0. 1 mA. (The voltage of ABL terminal -C741- should be 12V or less.)
CPTAnode Use the voltmeterwhich can indicateup to the first decimal ,;r$ pedance; ,
1
HighVoltage Voltmeter (DC Voltage Divider)
~
I
DigitalVoltmeter CPT GroundWire
-_-----. k+
ABL
10 HV +B
Less than i2V
9
I
Adjustment Procedure 1. Check that the normal high voltage and +B voltage is as below.
CHASSIS CZ68
EHT le
+B 140.0(V) +0.3v
El 37.0 (KV) +1.3 KV
30.O(KV) fl KV
1.60rnA M.l mA
Adjustment Preparation 4. Set AC input voltage to 120*3V. Then, connect the VR (1 OOK-B) and Rl(27K) Note: At that time the value of VR should be maximum
to R927 and ground side as below.
c925 ,I
Use the voltmeter of input impedance indication to the 1 st decimal place.
IOM
ohm
or more
with
R92.5 + mm R926
CPT
Anode
/
CPT High VoltageVoltmeter (DC Voltage Dwider) I\ + + -8 Aa------Digital Vollmeter
Adjustment Procedure 2. Keep CONTRAST, BRIGHTNESS, and SCREEN VR as in item (3). Reduce the VR value gradually, and check that the picture disappears when high voltage is El. Immediately after checking that it disappears, turn off the set switch. Remove the VR and high voltage voltmeter. When connecting or removing high voltage voltmeter to or from anode cap, be sure to turn off the switch of the set. Also, be sure to perform it after the chassis discharge of residual high voltage, because the high voltage of CPT anode may be left.
5
A6LXlJ
ADJUSTMENT AGLXU CHASSIS I. MAIN CHASSIS ASSEMBLY ADJUSTMENT SPECIFICATIONS PAGE # . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............. 8 8 8 8 8 8 9 9 10 II t1 12 12 12 12 12 12 12 12 13 13 13 14 14 14
1, Signal Block Adjustment.. ................................................................................................................................................................ 1.1 Memory Initialize (I) ............................................................................................................................................................. 1.2 1.3 AFC Operation Channel 1.3.1 1.3.2 1.3.3 1.3.4 1.35 1.3.6 1.4 1.4.1 1.4.2 1.4.3 1.4.4 Check .......................................................................................................................................................... Check .................................................................................................................................... Selection Operation
OSD Position Remo-Con Channel
Check ...................................................................................................................................................... Operation Check ......................................................................................................................................... Operation Check ............................................................................................................................. Check ........................................................................................................................................... Check ....................................................................................................................................... Check ..........................................................................................................................................
Selection
Al Mode Operation CCD Mode Operation PinP Operation
Check ................................................................................................................................................. Check.. ......................................................................................................................................
Signal Circuit Operation Auto Color Operation Noise Reducer.. Weak Electric
........................................................................................................................................................... Field Check ..........................................................................................................................................
Notch Filter Circuit Check ............................................................................................................................................
2. Power Supply and Main P.W.B. ..................................................................................................................................................... 2.1 +B Voltage Adjustment ....................................................................................................................................................... 2.2 2.3 2.4 2.5 2.6 2.7 2.8 II. COMMON Protection Circuit Operation Check FBT Protection Circuit Operation Check High Voltage Limiter Circuit Coarse Coarse Coarse Side Pin Distortion H. Size, H. Center Vertical Discharge SERVICE Amplitude Adjustment Adjustment Adjustment .................................................................................................................................... ............................................................................................................................ .............................................................................................................................. ............................................................................................................................... ...............................................................................................................................
................................................................................................................................................
of 200V Line ...................................................................................................................................................... ADJUSTMENT a.............., A ..,..............................,............,....,.......,,...,,......
e..,.,..........,.,,..m.... e,.se,,.....m................ 14 14 14 14 15 15 16 16 16 17 17
1. Deflection 1.1 1.2 1.3 1.4
Circuit Adjustment Contents
........................................................................................................................................................ for CPT.. ..............................................................................................................................................
Alteration
Purity Check ....................................................................................................................................................................... Focus Adjustment ............................................................................................................................................................... Deflection Circuit Picture Adjustment .................................................................................................................................
2. Signal Circuit Adjustment .............................................................................................................................................................. White Balance Adjustment ................................................................................................................................................. 2.1 2.2 2.3 2.4 Sub Brightness Shoot Balance Adjustment Adjustment ................................................................................................................................................ ................................................................................................................................................. ......................................................................................................................................................
Sub Picture Adjustment
6
A6LXU
ADJUSTMENT SAGLXU CHASSIS 2.5 Surround 2.5.1 2.5.2 2.5.3 25.4 2.5.5 2.5.6 2.5.7 2.5.8 2.6 Operation Check.. ............................................................................................................................................... Off Check.. ................................................................................................................................................... Off/Mono Check.. .......................................................................................................................................... Check.. .............................................................................................................................................. SPEClFlCATlONS PAGE # 18 18 18 18 18 18 19 19 19 i9 19 19 20
Surround Surround
Matrix Surround
Matrix Surround/Mono Check ...................................................................................................................................... Hall Surround Check ................................................................................................................................................... Hall Surround/Mono Dolby Surround Dolby Surround/Mono Check ......................................................................................................................................... Check ................................................................................................................................................
Dynamic
Check ...................................................................................................................................... Bass Circuit Operation Check .............................................................................................................................
........................................................................................................................... 3. Check in Combination with Externat Equipment Check in Combination with External Equipment ................................................................................................................ 3.1 4. Polarity Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..=.......................................................................................................................................*..-..
Ill. INITIAL
SETTING
FOR SHIPMENT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..........................
20
:jlV. ADJUSTMENT
POINT LOCATIONS
. ..*.,.,.........~,...*.,..........L."........~~.~,...................~..........................................................................
22
Refer to CHASSIS SERVICE MANUAL PA NO, 0073 for additional technical information. Note: 1. MAIN CHASSIS ASSEMBLY ADJUSTMENT is done with precision equipment. Readjustment is only recommended if the service technician replaced a defective component related to the circuit. 2. COMMON SERVICE ADJUSTMENT is recommended for the service technician after final troubleshooting and repair is done. Quick check and fine tuning is advisable to verify that the problem is eliminated.
7
AGLXU
I. MAIN CHASSIS ASSEMBLY ADJUSTMENT 1. SIGNAL BLOCK ADJUSTMENT 1.1 Memory Initialization Adjustment procedure
(I) Press memory initialize key using the R/C. If you do not have this key, short the pins of the 2 pin connector PI1 for one second, then remove. A beep will be heard. Check the OSD according to the chassis type.
Note: Modulation
the color Checking
signal should bar signal. jig (All channel --------------------1
be used
at the circle
pattern
and
converter
can
be used)
RF
I I
(2)
Initialize
OSD (Memory MEMORY
Switches)
SWITCH 0 El 0 0 1
PIP 1 PIP2 POWER ON1 POWER ON2 AUX 3 SUR 1
SUR 2
q
& 1 1 III 01 1 il il 1 01 TO ANT
q
0 0
00
MAGIC I=. W. CONT S. CONT ANT CTV/PTV D. BASS 3D Y/C NOTCH PIP POSITION
a0 0 0 cl 0 00
1.3 Channel Selection Operation 1.3.1 OSD Position check Adjustment Preparation
(1) (2)
Check
Receive Hitachi circle pattern or standard Video setting in normal condition (center).
signal.
Adjustment
(1) (2) (3) (4)
Procedure
il 0 il HP 0111 (0000-l 111) VP 0111 (0000-1111) SHOOT BAL. ADJ 37 (O-63) SUB BRIGHT ADJ 127 (63-l 91)
The above table explains the AGLXU chassis specification
Press MENU button. Check that the lower blue rectangle matches the circle pattern measure of 3.5?2 as it shows. Check that the COLORED BAR matches to circle pattern measure of 3.5+1 as it shows. If using a standard signal, check distance between edge of set and OSD (XL and XR) shown in table below.
Note:
for the memory switch
(3)
arrangement.
COLORED
BAR
Press Memory Initialize key of the R/C one more time and check that the set is returned to factory shipping conditions. If you do not have this key, short the pins of the 2 pin connector Pll for one second, then remove. shipping conditions. any buttons during this operation.
n
Note: The TV will be set to factory
Do not unplug set or press
1.2
AFC Operation Check Adjustment Preparation
(1) (2) Connect the jig shown Turn on the sub-picture. below to the ANT (A) terminal.
Adjustment
(1) (2) Select Receive channel Check Receive Check (Perform Receive Check (Perform Select Same
Procedure
main picture. a standard carrier signal (not offset) with the UP/DOWN or direct selection buttons. that it is pulled into the standard tuning point. an offset signal of +1.5MHz. that it is pulled into the standard tuning point. the channel selection operation again.) an offset signal of -15MHz, that it is pulled into the standard tuning point. the channel selection operation again.) sub-picture. as adjustment on items (2) (3) and (4).
(3)
(4)
(5) (6)
8
AGLXU
1.3.2 Remo-Con Operation Check
1.3.2.1 Direct Channel Selection Adjustment Procedure (1) Input a channel number using the "0" to "9" buttons. Check that the input number matches the displayed channel number, and also the picture received matches the channel number. 1.3.2.2 LST-CH Adjustment Procedure (1) Check that the channel being channel received immediately -1 button is pressed. 1.3.2.3 MUTE Adjustment Procedure (1) Check that sound every time the mI
VOLUME 1111111llll
VOLUME : green
yel;oW
AVX Selection 1.3.3.4 (1) EverytimetieAVXselectionbutton ispressed,theinputofthepicture displayedonthesc~changesinsequenceasshowntselow. ANT A being received 4 VIDEO 4 VIDEO J/ VIDEO 4 ANT B 1 Channel 2 3 being received
received before
alternates with the every time the
alternates between mute button is pressed.
and normal
Channel
+
: Green IIIIIIIIIIII YELLOW
I MUTE
llllllllll~,,,,,,,,,,.,
1.3.2.4 RECALL Adjustment Procedure (1) Check that the On-Screen Display alternately every time the IRECALL/ * Check that the contents of the picture displayed screen rr-tatchesthecurrent On-Screen Display * WithVIDEO andVIDEO 3, iftheSinputisused, "(S-IN)" is displayed. cn the
is turned button
ON and OFF is pressed.
1.3.3
Channel
Selection
Operation
Check
1.3.3.1 POWER Adjustment Preparation (1) Set so that the VHF/UHF/CATV
signal
can
be received
Adjustment Procedure (1) Every time the POWER button is pressed, should alternate between ON and OFF
the power
1 s3.3.2 CH UP/DOWN Adjustment Procedure (1) Every time the CH UP (A) or CH DOWN (v) button pressed, the normal reception should be displayed VHF, UHF and CATV. * Check that the On-Screen Display corresponding to the received contents can be displayed. * ANT indication color.
is for
1
ANT
1 Cl-l Display
Color
)
1.3.3.3 VOL UP/DOWN Adjustment Procedure (1) Every time the VOL UP (A) or VOL DOWN (v) pressed, the volume should increase/decrease ously. * Check that the On-Screen Display changes.
button is continu-
9
AGLXU
1.3.3.5
40.
Clock Item
Set Specification mode (1) (2) (3) (4) Press Select Then Menu clock press and select set using initial set up using VA keys. VA keys. Remarks
1
Initial set-up
b key to set clock. * The addition diode intends to check the operation with check counting operation as 60 times mode.
The clock set should be set using the cursor buttons. The clock is started when the 4 key is pressed to go back to clock set menu. Connect the jig. DO25 to 1001 between (28) and (32). using the is going by 1
(5) (6)
Check that clock indication is displayed RECALL button. And the clock indication second per minute.
iig
1.3.4 Al mode operation check Adjustment Preparation (1) Receive the color bar signal. (2) Select the VIDEO SETTINGS option using the b button (3) Select Advance settings option using the b button. (4) Set the Ultra Al mode using the Av buttons. Adjustment Procedure (1) Set the AI:ON by pressing the b key of the remote control transmitter, checking that the display becomes dark when the front of QM02 (light detector transistor on the control P.W.B.) is covered with hands. (2) Set the AI:OFF by pressing the b key and check the contrast of the display return.
10
AGLXU
1.3.~
a^-
CCD
Mode
Operation Item
Check Specification Press using Press using MENU and select + keys. b button + keys. and select CUSTOMIZE option Receive caption Remarks signal signal. having closed
CLOSED
CAPTION
CLOSED
CAPTION
Press b button mode.
and select
the closed
caption
The DISPLAY mode should be set ON using the b key. The MODE should be set C.C. using the b key. The CHANNEL mode should be set 1 using the b key. Check setting the CAPTION is displayed corresponding on the screen. to the
Set CHANNEL to 2. Check that the CAPTION CHANNEL 2 is displayed on the screen. Set CHANNEL to 1. Check that the CAPTION CHANNEL 1 (FIELD 2) is displayed on the screen. Set the MODE to TEXT. Check that a black window appears and TEXT letters are displayed at the center of screen. Repeat from (6) to (7), and check letters are displayed. Set the MODE disappear. Set the DISPLAY CAPTION letters to C.C. The black that TEXT
of
* Reading error should not occur on any mode. The contents of error. 1. Wrong letters are displayed. 2. Letter omitting. 3. Other abnormal display.
of
window
should
to OFF. Check disappear.
that the
X
Y
.
<30mm ABCD _ . .
/ .
L
black
window
TEXT
letter
1.3.6 PinP Operation Check 1.3.6.1 Sub Picture Operation Adjustment Preparation (1) Connect the signal to ANT
b
and check
10
13
Main picture Sub picture
Adjustment Procedure (1) Press PinP key of R/C unit and PinP will appear on the screen. (2) Press PinP key again and the size of the PinP window will be reduced. (3) Press PinP key to remove PinP from the screen.
El
11
A6LXU
(2) (3) (4) Select Select Select the Video Setting option using b key. Advance Settings option using b key. Noise Reducer mode using AT key.
l-3-6-2 PinP Shift mode check Adjustment Preparation (I) Press PinP key of R/C unit. Adjustment Procedure (1) Check that with each press of SHIFT moves counterclockwise. When sub-picture channel number
key, the sub-picture
Adjustment Procedure (1) Set NOISE REDUCER:ON remote control transmitter,
by pressing the b key of the checking noise is reduced. check
is in the upper part of the screen, the of the main picture is in the lower right.
PinP Swap mode check l-3-6-3 Adjustment Preparation (1) Press PinP key of R/C unit. Adjustment Procedure (1) Check that with each press of "SWAP" key, the contents the main picture and sub-picture are exchanged. 1.3.6.4 PinP Freeze (at PinP: Adjustment Preparation (1) Connect the signal to ANT. (2) Press PinP key of R/C unit. Adjustment Check picture picture. Procedure that each alternates ON)
1.4.3 Notch filter circuit operation Adjustment Preparation (1) Receive the color-bar signal. (2) Select the Notch Filter mode. Adjustment (1) Set that the (2) Set Procedure the Notch Filter:ON the dot interference color-bar is reduced. the Notch Filter:OFF
by pressing the b key and check on horizontal color borderline of by pressing the b key.
of
(1)
time "FREEZE" key is pressed, between moving picture and
the subfreezing
Weak electric field check Adjustment Preparation (1) Connect one side of the 300 ohm feeder to 75 ohm300 ohm antenna adaptor. Beside, connect the antenna adaptor to the VHF antenna terminal board as shown below. (2) Turn to No Signal condition Adjustment Procedure (I) Check that phenomena beat, etc. do not occur
such as oscjllation on any channel.
and abnormal
/Antenna
Terminal
board
VHF/UHF
Moving
picture
-
Freezing screen. OFF)
picture
75 ohm - 300 ohm adaptor
(2)
Press
PinP key to remove
PinP from
1.3.6.5 PinP Freeze mode (at PinP: Adjustment Preparation (1) Connect the signal to ANT. (2) PinP mode OFF. Adjustment (1) Press (2) Check
2. Procedure FREEZE key on the R/C unit. that freezing sub-picture appears.
POWER 2.1
SUPPLY
P.W.B.
1.4 Signal Circuit Operation Check Auto Color Operation Check 1.4.1 Adjustment Preparation (1) Receive the color-bar signal. (2) Select the Video Setting option using the k key. (3) Select Advance Settings option using b key. (4) Select Auto Color mode by pressing AV key. Adjustment Procedure (1) Set COLOR CONTROL:MAX. (2) Set AUTO COLOR:OFF by pressing the b key, checking that the red part of color-bar signal grows deeper. (3) Return the AUTO COLOR:ON by pressing the b key. (4) Return the COLOR CONTROL;TYPICAL. 1.4.2 Noise Reducer Operation Checking Adjustment Preparation (1) Receive the color-bar signal.
+B Voltage Adjustment Adjustment Preparation (1) Set the AC input power supply tol20flV (distortion 3% or less). (2) Receive a color bar signal. (3) Set the Contrast Brightness control to maximum. (4) Measure about 30 seconds after the power is turned on. Adjustment Procedure (1) Connect the DC voltmeter to R908. (2) Adjust R928 so that the indication of the DC voltmeter is 140.0f0.3V.
2.2
Protection
Circuit
Operation
Check
2. 2.1 +2OV Audio Power Supply Adjustment Preparation (1) CONTRAST to maximum, BRIGHTNESS
to center.
12
Adjustment Procedure (1) Connect a 10kfi resistor between Q945 base and GND and check that the picture disappears. (2) Disconnect resistor immediately and the power cord. (3) Discharge C905 as follows. 2.4
(2)
After checking, remove AC PLUG and the IOK resistor to return the set to the previous state. After about 15 seconds, discharge C906. Turn on the power again, and check the set operates normally.
_L =
2.2.2 +26V Audio Power Supply Preparation for Adjustment (1) CONTRAST to maximum,
2 `=
(wire wound resistor)
High Voltage Limiter Circuit Operation Check Checking Preparation Connect the assembly to a standard set. (1) (2) Connect a high voltage voltmeter between CPT anode terminal (anode cap side) and the ground. (3) Set AC input voltage to 120f3V. (4) Receive a circle pattern or color bar signal and set "BRIGHTNESS" and "CONTRAST" to maximum. Adjust screen VR so that beam current is I&O. 1 mA. (The voltage of ABL terminal -C741 both ends should be 12V or less.) Adjustment Procedure Check that the normal (5) as below.
BRIGHTNESS
to center.
high voltage
and
+B voltage
is
Adjustment Procedure (1) Connect a 10kfi resistor between Q963 base and GND and check that the picture disappears. (2) Disconnect resistor immediately and the power cord. (3) Discharge C905 as foltows.
CHASSIS
E HT
IB
+B
II
El
Adjustment Preparation Set AC input voltage to 120?3V. Then, connect the (6) VR(lOOK-B) and Rl(27K) to R927 and ground side as below. Note: At that time the value of VR should be maximum. 2.2.3 +12V Power Supply Preparation for Adjustment (1) CONTRAST to maximum,
BRIGHTNESS
to center,
Adjustment Procedure (1) Connect a 1 OkM resistor between Q964 base and GND and check that the picture disappears. (2) Disconnect resistor immediately and the power cord. (3) Discharge C905 as follows.
CPT
Use a voltmeter of input impedance IOM ohm or more with indication to the 1 st decimal place.
z =
(wire wound resistor)
Adjustment Procedure (7) Keep CONTRAST, BRIGHTNESS, and Screen VR as in Item (4). Reduce the VR value gradually, and check that the picture disappears when high voltage is El. Immediately after checking that it disappears, turn off the set switch. Remove the VR and high voltage voltmeter. When connecting or removing high voltage voltmeter to or from anode cap, be sure to turn off the switch of the set. Also, be sure to perform it after the chassis discharge or residual high voltage, because the high voltage of CPT anode may be left. 2.5 Side Pin Distortion Coarse Adjustment Preparation (1) Receive a circle pattern (2) Set the AC input power For picture controls, set (3) and set the other controls Adjustment signal or cross-hatch signal. supply to 120+1V. the BRIGHTNESS to center to their standard conditions.
2.2.4 +B Over Voltage Preparation for Adjustment (1) CONTRAST to maximum,
BRIGHTNESS
to center,
Adjustment Procedure (1) Connect a 1Ofi resistor to both check that the +B voltage goes 2.3 FBT Protection Circuit Operation Preparation for Adjustment (1) Turn on the power of the set.
ends of R955 and up and down. Check
Adjustment Procedure (1) Add lOK!Z! (1/16w-1/8w) resistor between Q713 base and GND (/ENH2/ connector pin 0) and check the operation.
13
AGLXU
Adjustment Procedure (1) Vary R7HF so that the right straight. 2.6 (3) and left vertical lines are PY2 H. size, H. Center Coarse Adjustment Adjustment Preparation (1) Receive a circle pattern signal or cross-hatch signal. (Cross-hatch signal: 20 vertical lines, 14 horizontal lines.) (2) Set the AC input power supply to 120+ 1V. (3) Set CONTRAST to maximum and BRIGHTNESS to center. Adjustment Procedure (1) Vary R7H6 so that the horizontal size markers of the circle pattern at the right and left end are 1.5-I .5 on the average. (2) If using the cross-hatch signal, vary R7H6 so that the far left and right vertical lines are at the screen edges. (3) Vary R759 so that the difference of the horizontal size markers of the circle pattern at the right and left end are within 1.5. (4) If using the cross-hatch signal, vary R759 so that the difference of the far left and right vertical lines at the screen edges are within 0.5 of a cross-hatch. 2.7 Vertical Amplitude Coarse Adjustment (R631) Adjustment Preparation (1) Receive a circle pattern signal or cross-hatch signal. (Cross-hatch signal: 20 vertical lines, 14 horizontal lines.) (2) Set the AC input power supply to 120f IV. (3) For picture controls, set the BRIGHTNESS to maximum and set the other controls to their standard conditions. Adjustment Procedure (1) Turn the vertical amplitude adjustment VR (R631) and adjust as shown below. (2) If using the cross-hatch signal, vary R631 so that the top and bottom of the screen edge is 7 cross-hatch away from the exact center of the cross-hatch signal. Adjustment position (inner edge of the outer circle) 1.2 Purity Check The magnetic field in artificial magnetic field should follow the magnetic field according to the destination, and the set should face as follows. After degaussing in each direction, check these items visually and with a microscope. (A) No problem in white uneveness. (B) Each single color must not hit any other colors. (C) If white or each single color is defective, apply a magnet(S) on CPT for correction. If any magnet is applied, check it after degaussing. CPT P.W.B.
+2oov GND
1
Adjustment (1)
Procedure After the adjustment and checking of the mounting, the power is turned off then close the Sl, S2 switch (for 3-5 seconds) and discharge 200V line. SERVICE CIRCUIT ADJUSTMENT ADJUSTMENT
It. 1.
COMMON DEFLECTION 1.1
Alteration Contents for CPT (1) Keep DY sticked to CPT funnel. (2) Receive white raster signal and adjust the white balance according to Item II, 2.1. (3) Set BRIGHTNESS control and CONTRAST to maximum and apply heat-run to the TV set with circle pattern or white raster signal received for "T" minutes or more. (See Table l-1 .)
Table MODEL 35UX85B (CZSS) 1
I
l-l 1 MINUTES(T)
I
CPT (MAKER) A89AGFll Xi 0
1
I
NOTE 17% Cf'T
1
40 min.
2.8
Discharge of 200V Line Adjustment Preparation (1) After the adjustment of assembled P.W.B. and after checking of mounting, the jig below is connected. (2) Deflection P.W.B.
the MODEL 35UX85B (CZ68) ( CPT (MAKER) A89AGFllXlO ( CHECK FACE
EY2 connector
North South
A: 1OKR
A6LXU
1.3 Focus Adjustment
NO.
MODEL
CPT
l l
Condition Receive the cross-hatch signal Contrast Control: Maximum 0 Sharpness Control: Center l Brightness Control: Center
Focus VR Setting Position a) Turn the Focus VR (F2) gradually to adjust 6th vertical line becomes best. b) Turn the Focus VR (Fi) gradually to adjust center horizontal line becomes best. c) Turn to Item (a)/(b) again and finish.
1 1 1 35UX85B 1 A89AGFll X10
6th h
2nd 4
6th
1.4.2 Vertical Size Adjustment (R631) Adjustment Preparation (1) The TV set should face North or South. (2) Receive circle pattern signal or cross-hatch signal. (Cross-hatch signal: 20 vertical lines, 14 horizontal lines.) Set CONTRAST control to maximum and BRIGHTNESS control to center. Adjustment Procedure (1) Adjust V. size VR (R631) so that the outer circle pattern is like figure. Note: Perform this adjustment more than 5 minutes after applying the power ON. i) When the picture center is below CPT center. Adjust so that l/2 of the width of outer circle comes to the screen. *If using the cross-hatch signal, adjust so that the top and bottom of the screen edge is 7.25 cross-hatch away from the exact center of the cross-hatch signal.
Screen
ii) Standard condition Adjust so that the inner circle comes in contact with the top and bottom of the screen. *If using the cross-hatch signal, adjust so that the top and bottom of the screen edge is 7 cross-hatch away from the exact center of the cross-hatch signal.
1.4
Deflection
Circuit
Picture
Adjustment
Horizontal Center Picture Adjustment (R759) 1.4.1 Adjustment Preparation (1) Receive circle pattern signal or cross-hatch signal. (Cross-hatch signal: 20 vertical lines, 14 horizontal lines.) Set CONTRAST control to maximum and BRIGHTNESS control to center. Adjustment Procedure (1) Adjust H. Center VR (R759) so that the difference horizontal size markers of the circle pattern at the and left end are within 0.5. (2) If using the cross-hatch signal, vary R759 so that difference of the far left and right vertical lines at screen edges are within 0.25 of a cross-hatch.
of the right the the
iii) When the picture center is above CPT center. (1) When the picture center is O-2 mm above CPT center, adjust so that the bottom of the inner circle comes in contact with the TOP of the screen. *If using the cross-hatch signal, adjust so that the top and bottom of the screen edge is 7 cross-hatch away from the exact center of the cross-hatch signal.
15
A6LXU
(2) Except for the above, adjust so that l/2 of the width of the outer circle comes to the BOTTOM of the screen. *If using the cross-hatch signal, adjust so that the top and bottom of the screen edge is 7.25 crosshatch away from the exact center of the crosshatch signal. When a bright colored line does not appear, set the screen VR fully clockwise. Turn fully clockwise the low brightness white balance VRs except VR-A and adjust so that red, green and blue bright colored lines appear on the screen equally. Return the switch S851 back to normal position. Set CONTRAST and BRIGHTNESS controls to minimum and turn sub-black level VR (R325) to set at the position where the white raster is just slightly seen. Set the white balance meter at the center of the screen Adjust CONTRAST control so that the indication of the brightness meter is 80% of the full scale. Then, turn the drive adjusting VRs (R860, R864) and adjust the high-brightness white balance. Adjust CONTRAST control to minimum and check that the low-brightness white balance is obtained by directly observing the CPT surface, without using a mirror. When the low brightness white balance is not obtained, adjust other low brightness white balance VRs except VR-A and return to item (6). White balance color temperature setting: 7,200" K.
(2)
(3) (4)
(5)
(6)
(7)
(8)
1.4.3 Side Pin Distortion Adjustment (R7HF) Adjustment Preparation (1) Receive cross-hatch signal. Set CONTRAST control to maximum and BRIGHTNESS control to the point where the background is set. Adjustment (1) Adjust straight Procedure R7HF so that the line of the right and (Specification: Dt. D,<7mm 35V)
(9) Set white control
left is 2.2 1.4.4 Horizontal Size Adjustment (R7H6) Adjustment Preparation . (1) Receive circle pattern signal or cross-hatch signal. (Cross-hatch signal: 20 vertical lines, 14 horizontal lines.) (2) Set CONTRAST control to maximum and BRIGHTNESS control to center. Adjustment Procedure (1) Adjust R7H6 so that the average reading of right and left is 1.5. The reading of each side should be at least 1. Acceptable Tolerance: 1.5-tO.5 (2) If using cross-hatch signal, adjust R7H6 so that the far left and right vertical lines are at the screen edge, within 0.25 of a cross-hatch. 2. SIGNAL CIRCUIT ADJUSTMENT and check 9,300X
(color temperature that color temperature
control) to cool, is approximately
Sub Brightness Adjustment Adjustment Preparation (1) Start adjustment 20 minutes or more after the power is turned on. Receive the color bar signal. (2) Set the CONTRAST and color controls to minimum. (3) The vertical incident illumination on the screen should be 20 Iux or less. Adjustment Specification: within i0.3 step Adjustment Procedure (1) Press the memory initialize key on the R/C. If you do not have this key, short the pins of the 2 pin connector PI1 for one second, then remove. A beep will be heard. (2) Press the A button to select SUB-BRIGHTNESS Mode. (3) Use the 4, buttons to increase or decrease so that points Aland A2 sink to black and A3 rises slightly above it. (Visually adjust) (4) After above adjustment, SUB-BRIGHTNESS will have value between 63 and 191. Adjustment is now complete. (5) After adjustment is done, press the memory initialize key on the R/C one more time and the data is stored in memory. If you do not have this key, short the pins of the 2 pin connector PI1 for one second, then remove. Note: When selecting SUB-BRIGHTNESS mode the peon sets the CONTRAST and COLOR to min. automatically but make sure that the other conditions are center. Directly observe the CPT screen by eye without using a mirror.
White Balance Adjustment Adjustment Preparation (I) Apply heat-run 20 min. or more after the power is turned on. (2) Check that the purity adjustment has been completed. (3) Set the vertical incident illumination on the CPT surface to 20 Iux or less. (4) Receive white raster signal and set the color temperature control (white control) to STD. (5) Set drive adjustment VRs (R860, R864) to the mechanical center. (6) Turn low brjghtness white balance adjusting VRs (R866, R868, R870) fully counterclockwise. (7) Turn the screen adjusting VR fully counterclockwise. (8) The picture is switched to a lateral line by the switch 5851. Adjustment Procedure (I) Turn the screen adjusting VR clockwise and set to the position where the bright colored line starts appearing on the CPT screen. Do not turn thereafter the low brightness white balance VR (this is called VR-A) corresponding to the color first appearing.
Should Should Q 1 I 1 WiOO%
Adjustment
sink to black. from blact
rise slightly
1
BLK
within k0.3 step
specification:
16
A6LXU
2.3 Shoot Adjustment balance adjustment Preparation Receive the reverse cross-hatch hatch lines are black.) Set the video condition to factory 2.4.2 pattern reset. signal. (CrossSub Picture White Balance Adjustment BLUE ~ Adjustment R5C7 GREEN - Adjustment R5C5 On the Signal P.W.B. RED - Adjustment R5C3 Preparation for Adjustment by pressing "P in P" key or remote (1) Turn off the sub picture controller. (Keeping the white signal with main picture.) Display and match the sub picture details with the main (2) picture details by pressing "FREEZE" key of remote controller. Condition should be set as follows. (3) CONTRAST MAXIMUM ( OTHERS 1 CENTER amplitude 1 .OVpp (4) White signal specification
(1)
(2) Adjustment (1)
1
(2) (3)
(4)
Procedure Press the memory initialize key of the R/C. If you do not have this key, short the pins of the 2 pin connector PI1 for one second, then remove. A beep will be heard. Press the A button and select SHOOT BALANCE mode. Using the 4, buttons, gradually adjust so the widths of pre-shoot and over-shoot of the vertical line (black) shown in the circle pattern are balanced. (Visually adjust) After adjustment is done, press the memory initialize key on the R/C one more time and the data is stored in memory. If you do not have this key, short the pins of the 2 pin connector PI1 for one second, then remove.
Adjustment Procedure (1) Observe Q857 collector on the CPT P.W.B. and turn the BLUE adjustment VR R5C7 and adjust so that the amplitude of the sub picture is the same as that of the main picture. (2) Similarly, observe Q854 collector on the CPT P.W.B. and turn the GREEN adjustment VR R5C5 and adjust so that the amplitude of the sub picture is the same as that of the main picture. Similarly, observe Q851 collector on the CPT P.W.B. and (3) turn the RED adjustment VR R5C3 and adjust so that the amplitude of the sub picture is the same as that of the main picture. Check that the white balance of the sub picture is the (4) same as that of the main picture. If it does not, return to step (1). ti Adjustment specification: + 1V * Waveform of Q851/Q854/Q857 (R/G/B)=cathode (sub picture level compared with main picture level.)
`,
Pre-Shoot
CTAdjust same width Directly observe using a mirror. the CPT screen by eye without
1-1
Oscilloscope range : 1 OV/0.2msec * If the sub picture sag to vertical direction, adjust the sub picture center point.
Note:
Sub oicture `Center point
2.4
Sub
Picture
Adjustment
2.4.1 Sub Picture Black Level Check Adjustment Preparation (1) Start adjustment about 20 minutes after the power switch is turned ON. (2) After displaying the white signal with main picture, display the sub picture and receive the color bar signal with it. Condition : i CONTRAST-MAXIMUM OTHERS-CENTER
I!? Perform this adjustment after the white balance and sub-brightness adjustments of the main picture are completed. Q White balance 7200"K+OMPCD (Color coordinates: x=0.301, y=O.310) A Refer to the sub brightness adjustment for details of the gray scale of color bar signal. 2.4.3 Sub-picture position adjustment Adjustment Preparation (1) Select signal on main picture. (2) Video settings have to be at normal
Adjustment Procedure (1) Check the sub picture setting the part bar pattern to black. (Check specification kO.5 steps.)
condition.
of Al of the color
Adjustment Procedure (I) Press the Memory Initialize key on have this key, short the pins of the one second, then remove. A beep Press the AT buttons to select the (2)
the R/C. If you do not 2 pin connector PI1 for will be heard. PIP position mode.
17
(3) (4)
(5)
Adjust the VP (vertical) and the HP (horizontal) position using the 4, buttons. Press the Memory Initialize key of the R/C to store the value in memory. If you do not have this key, short the pins of the 2 pin connector PI1 for one second, then remove. Select PIP mode and shift the sub-picture using the SHIFT button. Distance between PIP and edge of screen should be equal when shifted. if it is not, repeat (i)-(5). Surround Operation Check Adjustment Preparation Input the following audio signals to the audio input of the VIDEO INPUT terminals. When checking surround: L CH: 400Hz sine wave 475mVrms R CH: 5kHz sine wave 475mVrms Set the INT. SPEAKER : ON Set the volume controls of FRONT and REAR to center. Set the BASS, TREBLE and BALANCE to center. Note: Front waveform: Front speaker output of the set. Rear waveform: Rear speaker output of the set. Surround Off Check Set to SURROUND: OFF and check shown below is obtained.
2.5.3 Matrix Surround Check Adjustment Preparation (1) Set to SURROUND : MATRIX Check that the following waveforms are obtained. Front : Check that the phases of R and L are different and 400H.z is superimposed on 5kHz. The amplitudes of R and L are different. Rear : Check that the phases of R and L are opposite and 400Hz is superimposed on SkHz. Front Rear
2.5
O.Sms/div+
0.5ms/div+
2.5.1 (1)
that the waveform 2.5.4 Matrix Surround/Monaural Check Adjustment Preparation Check that the following waveforms are obtained. : R and L waveforms are almost equal. Front Rear : R and L waveforms are almost zero.
Front
@KHz)
Front
Rear
400Hz
(400Hz)
400Hz
OSms/div
Note: REAR output is no signal. 2.5.5 Hall Surround Check Adjustment Preparation (1) Set to SURROUND : HALL. Check that the following waveforms are obtained. : Check that the phases of R and L signals are Front different and 4OOHz is superimposed 5kHz. Rear : Check that the phases of R and L are opposite and 400Hz is superimposed on 5kHz. The amplitudes of R and L are equal. Front Rear
2.5.2 Surround Off/Monaural Check Adjustment Preparation Check that the following waveform is obtained. of 2 channels are equal.
The amplitudes
Front
400Hz
400Hz
Note:
Monaural check can be omitted. REAR output is no signal.
0.5ms/div-t
O.Eims/div+
Note:
Amplitude
levels
of front
R and L are not even.
18
A6LXU
2.5.6 Hall Surround/Monaural Check Adjustment Preparation Check that the following waveforms are obtained. Front : The phases of R and 1 are different. The amplitudes of R and L are different. Rear : The phases of R and L are opposite. Front Rear 3. CHECK 3.1 IN COMBINATION WITH EXTERNAL EQUIPMENT
0.5ms/div+ Note:
O.Sms/div+
Check in Combination with External Equipment Preparation for Check (1) Input video signals to "Video I", "Video 2" and "Video 3" input terminals. Signal condition 100% white signal 140.2vp-p 75fi termination (2) Input audio signals to Audio I", "Audio 2" and "Audio 3" input terminals. Signal condition 435+20mVrms VCR or Tuner or equivalent. the monitor TV to output terminal. (3) Connect Input Y-C separate signats to "S-VIDEO" input terminal. (4) the "Audio Input Terminals" of the monitor TV (5) Connect to "Audio to Hi-F?' output terminals, and "Transmitter Out" output terminals. Checking Procedure (1) Each time the input selection of the remote control transmitter is pressed, input signal should be received alternately. (2) Check that the picture and sound are normal when the external signals are received. (3) Check that the "Transmitter Out" signal are switched when the "WtRELESS MODE" is selected. Remark: (1) The 100% white of TV signal should be almost the same brightness as the IVp-p (75R termination) external video input signal. (2) For the audio signal 100% modulation (25kHz div) of the TV signal should be almost the same level as the 435mVrms external audio signal. Checking Procedure (4) Check that the reception of the monitor TV connected to output terminal is also switched when Item (1) is checked. Remark: (1) The signals from the output terminals are the same as those of the picture and sound of the TV set. Checking Procedure (5) When the phono plug connected to Audio R terminal is pulled out with the external signat input, the sound from both left and riyht speakers should be normal (L monaural check). When the phono plug is connected only to R terminal, check that the sound is output only from the right speaker. (The sound should not be output from the left speaker.) Check above in "VIDEO 2" and "VIDEO 3" modes. Remark: (1) The audio input terminals are switched over between stereo and monaural by switching the phono jacks. l When the phono plugs are connected to both L and R: Stereo input mode. l When the phono plug is connected only to L: Monauraf input mode. Checking Procedure (6) When the Video (S-In) is selected, the picture and sound from the Y/C separated signal should be received. However, the output signal is composite signal of SVideo input signal.
The monaural check can be omitted. Amplitude levels of front R and L are not equal
2.5.7 Dolby Surround Check Adjustment Preparation (1) Set to SURROUND : DOLBY Check that the following waveforms are obtained. Front : R is 5kHz sine wave. L is 400Hz sine wave. Rear : R and L are the same signal and 400Hz is superimposed on 5kH.z. Front Rear
0.5ms/div+
0.5ms/div+
2.5.8 Dolby Surround/Monaural Check Adjustment Preparation Check that the following waveforms are obtained. : R and L are the same signal. Front Rear : Almost no output from both R and L. Note: Front side check can be omitted. Front Rear
400Hz
* 400Hr
2.6
Dynamic Bass Circuit Operation Check Adjustment Preparation (1) Input 90Hz audio signal with 435mVrms (2) Set the VOLUME to center. (3) Set to SURROUND OFF. Adjustment Procedure (1) Switch the DYNAMIC BASS of the SOUND from OFF to ON and check that the output front speaker changes by t6dB at 70Hz.
to L/MONO.
SETTING tevel of the
A6LXU
(7) The signal controlled from the TV Balance, Volume, Mute, Surround) from Audio to Hi-Fi output terminal checked. The signal controlled from the TV when the "WIRELESS MODE" is P BALANCE, VOLUME, SURROUND, output "WIRELESS MODE" is main output from transmitter terminals. side (Bass, Treble, should be output when Item (1) is side (P in P VOLUME in P, BASS, TREBLE, MUTE when the or rear) should be
(8)
4.
POLARITY CHECK This check is performed according There should be electricity between earth.
to UL standard requirement. AC power cord and chassis
III.
INITIAL
SETTING
1
NO. 1 2 3 4 5 6 7 8 9 10 Reception ANTENNA INPUT VOLUME P IN P P in P POSITION cm Al R/CABLE CHANNEL CHANNEL CHILD VOLUME CLOCK CONTRAST TINT COLOR BRIGHTNESS SHARPNESS ULTRA BALANCE BASS TREBLE MTS MODE VIEW LOCK
NAME Channel 03 CH ANT TV 20 STEP ) OFF LOWER OFF AIR MEMORY CAPTION 02-l 3 CH A
SPEC
I RIGHT (P in P ON)
No Reqistered
for all Channels I
I
If 12 13
I OFF
OFF OFF
for all Channels for all Channels
CORRECTION SET
I
14 15 16 17 18 19 20
) MAXIMUM i/2 l/2 l/2 l/2 Al OFF l/2 l/2 l/2 1 STEREO BASS ~ 1 OFF 1 ON 1 20 STEP 1 OFF OFF CAPTION CHl
I
I
1 I I I I I
I --21
22 1 1 23 24
DYNAMIC
(TINT.PEAKERS 1 1 26 27 28 29 30 REAR VOLUME
SURROUND FREEZE CCD CCD MODE CHANNEL
I I
I
20
A6LXU
Ill. INITIAL SETTING
21
AGLXU
IV. ADJUSTMENT POSITION LIST
SIGNAL
P.W.B.
325
-
-l
240 I
0
I-
325
:
SUB-SIGNAL
P.W.B.
R5C7
(B) 0 (G) 0 (R) 0 P in P UNIT
lul
SURROUND P.W.B.
PI1
R5C5 R5C3
.
2LINE COMB.
UNIT
TERMINAL
P.W.B.
240
`I
-0 0
22
IV. ADJUSTMENT
POSITION
LIST
POWER
P.W.B./DEF.
P.W.B.
DEF
P.W.B.
V. SIZE i POWER P.W.B. c R631
ADJ.
0
Q711
I
I
I R759 ' -=--. H. CENTER ADJ.
T902
R7HF
I
R7H6
R928
J
/
+BADJ
r
0
23
IV. ADJUSTMENT
POSITION
LIST
CPT P.W.8.
R-DRIVE
\
R860 I B-DRIVE R864 B F /
CUT-OFF SWITCH
'
24
TROUBLESHOOTING
PRODUCT
SAFETY NOTICE
The shaded and A marked components have special characteristics important to safety. Read carefully the product safety notice of each Service Manual. Don't degrade the safety of the receiver through improper servicing when replacing any of these components.
HOW TO USE THE FLOW CHART `1) The flow chart shows the following: Normal (5.7V) ( This shows the name of the faulty circuit and main parts to be checked.
This shows the point to be checked.
(2) The voltage shown in the chart may differ to some extent depending
on the condition
of the set and tester.
.PRECAUTION 1. 2. 3. 4. 5. 6. 7. 8. 9.
ON MAKING
MEASUREMENTS
AND ON HANDLING
When any parts become abnormally hot or there is a smell of burning, cut off the power immediately. Do not make shorts between circuits or across terminals except for those specified. When applying a signal for checking purposes, make connection in the alternate current system for any not specified. When measuring the voltages of ICs and TRs, be careful to see that the lead bar of the tester does not touch any other terminal. Measure the voltage correctly. Measure the resistance over a small range. Be sure to switch off the power when replacing parts. Do not apply a solderjng iron for a long time when replacing parts. (Use a solder-wick.) Use an isolation transformer when troubleshooting.
25
AGLXU TROUBLESHOOTING
@ POWER RELAY DOES NOTTURN ON
About 15V
R/C Circuit
NO
YES [ I
26
A6LXU TROUBLESHOOTING
@ NO RASTER AND SOUND
About 320V (at AC120V)
Open
Normal
DC 2V
El
D991 defective
Short (between
C and E)
Normal Normal iov v 1901,1501,1001 defective
ov /,
27
A6LXU TROUBLESHOOTING
OV or low voltage
Normal 9v
waveform
of 1501
No switching
1501, F701 open, n7n' UILI, CDT u rpl -lefective
0.7v (High voltage protection circuit operating) 1501 defective
1901, Q901, D901, T701, T702, DY, C721 etc. 9V Line defective C629 shorted, 1401 defective 1902 defective Q72 l defective
28
TROUBLESHOOTING
@ NO PICTURE
Does
On-Screen
No
1501, 1001, 1006, (2024 defective
Is waveform
of
Normal t
c
Is waveform
Abnormal
of
Normal
i
Abnormal Front-end, IYOI defective
29
AGLXU TROUBLESHOOTING
@ DARK PICTURE
controls
are increased
picture when Contrast
Does not change
b
1501, 1001, Q501, Q502 defective.
Normal
b
Front-End, Tuning circuit, defective.
No sync. or distorted picture )
I Front-End, peripheral 1501 and parts defective.
I
No raster or dark )
Front-End, IYOI, QCOI, Q5A3, Q5A4, Q5A5, Q5A6, and peripheral parts defective.
Lower than 120V cathode R, G, B
1 CPT P.W.B., CPT, FBT,
1
Higher than 120V
Low output transistors Q852, Q855, Q858
Normal
(5.5V) )
1
1501, 1001, 1002, 1003 1004 defective
I
30
AGLXU TROUBLESHOOTING
@ RECEPTION IMPOSSIBLE WITH SNOW NOISE
ANT A-Green
Channel OS0
Reception impossible with snow noise
No i
15A4,0105
I
(
I
(
I
( ulot (
ANT B-Yellow
Channel
OSD
Reception
impossible with snow noise
No
LOCK pin of U102
voltage applied to pins
No
31
AGLXU TROUBLESHOOTING
@ DEFECTIVE SYNCHRONlZATlON
(
Defective sjchronization
>
Check voltage of
Abnormal
(OV)
7 Normal G-w `I'
0 bserve waveform
Normal
1620 defective
32
c
TROUBLESHOOTING
@ NOSYNC.
Bright Is picture Bright?
Dark
.
Front-End defective
@
ONLY
RASTER
OR FLYBACKTRACE
APPARENT
ON PICTURE
Normal Output Transistors
High
1501 and peripheral parts defective
1
Abnormal
1
33
Abnormal
1620, 1001 defective
TROUBLESHOOTING
@ NO COLOR
Normal
Normal F When normal
0201, Q5A3, Q5A4, Q5A5, Q5A6 and peripheral parts defective
T Vp-p 300m
1
waveforms
of pins )
1501 and peripheral defective
parts
Abnormal
Does not change ) control is turned. 1001 and peripheral defective parts
!I.
It changes
1501 and peripheral parts defective
34
I
TROUBLESHOOTING
@ WHITE BALANCVTINT DEFECTIVE
AGLXU
Normal white balance
I
voltage
Abnormal
One of them abnormal
Normal
Normal of Video Output
One of them abnormal CPT P.W.B., Q812, Q85 1-Q859 defective
35
AGLXU TROUBLESHOOTING
@ NO VERTlCAt DEFLECTION OR V. SIZE IS DISTORTED
ov
Normal 26V
1
1620, D721, R730 defective F601 open
25V
ov
Normal (12V DC 50V peak) 4
ov
36
TROUBLESHOOTING
@ NO SOUND (WHEN SURROUND OFF)
OV or lower
Defective 23V
Audio Power
Supply
line
input at pins @ and @I
1402 defective
IA03 defective
No I i
IYOI defective No I I
Ul 01, Front-End
Circuits
defective
37
AGLXU TROUBLESHOOTING
@ NO SOUND (NO AUDIO POWER)
Check SVcc2
F
L935 defective
@
CHANNEL
DISPLAY
IS NOT
DONE
Abnormal waveform of 1001
Normal
waveform
of 1001
1007 and peripheral parts defective
Normal
/
38
I
TROUBLESHOOTING
@ CHANNEL SELECTION IS NOT DONE
A6LXU
Abnormal
Normal
Abnormal Channel Display vary?
Normal
NO
[ YES f UIOI, QIOI, Q102, Qi 05 defective
39
AGLXU
I TROUBLESHOOTING
@
DOES
NOT
OPERATE
BY REMOTE
CONTROL
Abnormal
I
4
Normal
channel UP / DOWN Operate by the TV set? Does the power turn
NO
voltage of HMO1 pin @I
ov ov b b
YES
Normal
Abnormal
40
REPLACEMENT
PARTS LIST
PRODUCT SAFETY NOTE: Components marked with a Ahave special characters important to safety. Before replacing any of these components, read carefully, the PRODUCT SAFETY NOTICE of this Service Manual. Don't degrade the safety of the receiver through improper servicing. ABBREVlATtONS Capaitors: CD: PF: EL: PP: PR: TA: TM: Ceramic Disc Polyester Film Electrolytic Polypropylene Paper Tantalum Trimmer Resistors: CF: CC: MF: VR: WW: FR: MG: Carbon Film Carbon Composition Metal Oxide Film Variable Resistor Wire Wound Fuse Resistor Metal Glaze SYMBOL NO.
CSA3 CSA4 CSA5 CSA6 CSA7 CSA8 CSA9 CSCl csc2 csc3 csc4 csc5 CSC7 CSC8 CSEl CSE2 CSE3 CSE4 CSE7 CSE8 CSE9 CSFl CSF6 CSF7 CSF8 CSF9 CSG3 CSG4 CSG6 CSG7 CSG9 CSHl CSH4 CSH6 CSNl CSN2 CSN3 CSN4 CSN5 CSN6 CSN7 CSOl cso2 cs29 cs30 CS36 cs37 CS38 cs39 cs40 cs41 CS42 cs43 cs44 cs45
Semiconductors:
TR: Dt: ZD: VA TH: IC:
Transistor Diode Zener Diode Varistor Thermistor Integrated Circuit
SYMBOL NO.
PART NO.
CAPACITORS
PART DESCRIPTION
PART NO.
0890087R 0284638R 0880051 0880041 0880041 0880051 0880057R 0800049R 0800049R 0800015R 0800015R 0800015R 0800015R 0800015R 0800003R 0800003R 0244105R 0244105R 0800015R 0800003R 0800042R 0800059R 0800042R 0800042R 0800051 0800083F 0880057R 0880057R 0800083F 0800083F 0880057R 0880057R 0800015R 0800041 0800018R 0800047R 0800018R 0880044R 0800047R 0800018R 0880044R 0880057R 0800049R 0800023R 0800012R 0284638R 0284638R 0880057R 0800058R 0246451 0246451 0800058R 0880051 0880033R 0880051 CD EL PF PF PF PF PF EL EL EL EL EL EL EL EL EL CD CD EL EL EL EL EL EL EL EL PF PF EL EL PF PF EL EL EL EL EL PF EL EL PF PF EL EL EL EL EL PF EL CD CD EL PF PF PF
PART DESCRIPTION
lOOOPF-K 50V lOUF-SME(BP) 16V O,033UF-KEB 50V O.O056UF-KEB 50V O.O056UF-KEB 5OV O.O33UF-KEB 50V 0.1 UF-KEB 50V 1 OOUF-M 16V lOOUF-M 16V lOUF-M 16V 1 OUF-M 16V lOUF-M 16V IOUF-M 16V 1 OUF-M 16V 1 .OUF-M 50V 1 .OUF-M 50V 2200PF-K 50V TAPE 2200PF-K 50V TAPE IOUF-M 16V 1 .OUF-M 50V 47UF-M 25V 220UF-M 25V 47UF-M 25V 47UF-M 25V l OOUF-M 25V lOOOUF-M 25V 0.1 UF-KEB 50V 0.1 UF-KEB 5OV lOOOUF-M 25V lOOOUF-M 25V 0.1 UF-KE8 50V 0.1 UF-KEB 50V lOUF-M 16V 47UF-M 16V lOUF-M 50V lOOUF-M 6.3V lOUF-M 50V 0.01 UF-KEB 50V lOOUF-M 6.3V lOUF-M 50V 0.01 UF-KEB 50V 0.1 UF-KEB 50V lOOUF-M 16V 22UF-M 16V 4.7UF-M 50V lOUF-SME(BP) 16V lOUF-SME(BP) 16V 0.1 UF-KEB 50V 220UF-M 16V 3OPF-JB CH 50V 3OPF-JB CH 50V 220UF-M 16V O.O33UF-KEB 50V O.O015UF-KEB50V O.O33UF-KEB 50V
;A01 3A02 :A03 3A04 3A05 ?A06 :A07 ?A08 X26 :A27 :A28 x29 zA31 sA33 SA34 SA35 SA36 CA37 CA38 CA39 CA40 CA41 CA50 CA51 CA52 CA53 CA54 CA55 CA56 CA57 CA68 CA69 CA70 CA71 CA72 CA73 CA74 CA75 CA76 CA80 CA81 cc02 cc70