Memorex MT1190C User manual

Service Manual
MT1190C
19” Color Television
THIS SERVICE MANUAL IS FOR MT1190C SUFFIX A , B ,
C, D AND E CRT USAGE
SUFFIX A SUFFIX B SUFFIX C SUFFIX D SUFFIX E
V451 5721- 015ST51N
(51GGD95X)
5721- 51CN020T
(510UEB22DY)
5721-028TT48N
(A48LRH93X (W)) 5721- 029NT48N (A48LSD095X) 5721- 031ZT48N (A48LGS30X)
DY501 4993-118
4993-060 4993-126 4993-119 4993-123

-1 -
FEATURES
wOn-screen graphics guide you through setup features and operations
wAutomatic programming of channels allows easy selection of stations available in your viewing
area
wSleep timer programs the TV to turn itself off at a preset time
wOne day timer programs the TV to come on once at a preset time
wWeekly timer programs the TV to come on at a preset time every day
w26 button infrared remote control allows remote operation
wVHF/UHF/CATV tuning allows reception of standard broadcasts or cable TV channels
wClosed caption decoder displays captions or half-screen text
SPECIFICATIONS
AC Power Input: 120V, 60Hz
AC Power Consumption: 98Watts
Chassis Construction: IC Solid State
Picture Tube: 19” ( measured diagonally )
Speaker: 3.5 x 2 in (90 x 50 mm) Oval, 8 ohms
Tuner: 181 Channels, Freq. Synthesized
Remote Control: Infrared, Direct Access
26 Key, 2 “AA” batteries
Receiving Channels:
VHF 2 -13
UHF 14 -69
CATV
Mid Band 14 -22
Super Band 23 -36
Hyper Band 37 -65
Ultra Band 66 -94, 100 -125
Sub Mid Band 1, 95 -99
Cabinet: Monitor Style
Antenna Input Impedance 75 ohm (VHF/UHF) Coaxial Input
CAUTION:
•To prevent electric shock, match wide blade of plug to wide slot, fully insert.
wV-Block function

- 2 -
IMPORTANT SERVICE SAFETY INFORMATION
Operationofreceiveroutsideof cabinet or withbackremovedinvolves
a shock hazard.Work on these models should only be performed by
those who are thoroughly familiar with precautions necessary when
working on high voltage equipment.
Exercise care when servicing this chassis with power applied.Many
Bplus and high voltageRF terminalsare exposedwhich,if carelessly
contacted,cancauseseriousshockor result in damage tothechassis.
Maintain connecting ground lead connections between chassis,
escutcheon, picture tube dag and tuner cluster when operating
chassis.
These receivers have a “Polarized” AC line cord. The AC plug is
designed to fit into standard AC outlets in one direction only. The
wide blade connects to the “ground side” and the narrow blade
connects to the “hot side” of the AC line. This assures that the TV
receiver is properly grounded to the house wiring. If an extension
cord must be used, make sure it is of the “polarized” type.
When it is necessary to make measurements or tests with AC power
appliedto the receiver chassis,an IsolationTransformermustbeused
as a safety precaution and to prevent possible damage to transistors.
The Isolation Transformer should be connected between the TV line
cord plug and the AC power outlet.
Certain HV failures can increase X-ray radiation. Receivers should
not be operated with HV levels exceeding the specified rating for their
chassis type. The maximum operating HV specified for the chassis
used in these receivers is 25 KV ± 1.0KV at zero beam current with a
line voltage of 120V AC.Higher voltage may also increase possibility
of failure in HV supply.
It is important to maintain specified values of all components in the
horizontal and high voltage circuits and anywhere else in the receiver
that could cause a rise in high voltage, or operating supply voltages.
No changes should be made to the original design of the receiver.
Components shown in the shaded areas on the schematic diagram
or identified by the safety mark in the replacement parts list should
bereplacedonly with exactFactory recommendedreplacementparts.
The use of unauthorized substitute parts may create shock, fire,
X-radiation or other hazard.
To determine the presence of high voltage, use an accurate high
impedance HV meter connected between second anode lead and
the CRT dag grounding device. When servicing the High Voltage
System remove static charge from it by connecting 10K ohm resistor
inseries with an insulatedwire (such asa test probe)betweenpicture
tube dag and 2nd anode lead (AC line cord disconnected from AC
supply).
The picture tube used in this receiver employs integral implosion
protection.Replace with tube of the same type number for continued
safety. Do not lift picture tube by the neck. Handle the picture tube
only when wearing shatter-proof goggles and after discharging the
high voltage completely. Keep others without shatter-proof goggles
away.
When removing springs or spring mounting parts from tuner, tuner
cluster or chassis, shatter-proof goggles must be worn.Keep others
without shatter-proof goggles away.
SAFETY INSPECTION
Before returning the receiver to the user, perform the following safety
checks:
PROTECT YOUR CUSTOMER
1. Inspect all lead dress to make certain that leads are not pinched
or that hardware is not lodged between the chassis and other
metal parts in the receiver.
2. Replaceallprotectivedevicessuchas non-metallic control knobs,
insulating fishpapers, cabinet backs, adjustment and compart-
ment covers or shields, isolation resistor capacitor networks,
mechanical insulators, etc.
3. To be sure that no shock hazard exists, a check for the presence
of leakage current should be made at each exposed metal part
havingareturn pathto the chassis (antenna,cabinet metal, screw
heads, knobs and/or shafts, escutcheon, etc.) in the following
manner.
Plug the AC line cord directly into a 120V AC receptacle.(Do not use
an Isolation Transformer during these checks) All checks must be
repeatedwiththe ACline cordplugconnectionreversed.(Ifnecessary,
a non-polarized adapter plug must be used only for the purpose of
completing these checks.)
Ifavailable,measurecurrent using an accurateleakagecurrent tester.
(UseStandard Item No.25086,21641)Anyreadingof 0.4 mA or more
is excessive and indicates a potential shock hazard which must be
corrected before returning the receiver to the owner.
Ifareliableleakage current tester is not available,thisalternate method
ofmeasurement should be used.Usingtwo clip leads,connecta1500
ohm, 10 watt resistor paralleled by a 0.15 MF capacitor in series with
a known earth ground, such as a water pipe or conduit and the metal
part to be checked.Use aVTVM or VOM with 1000 ohms per volt, or
highersensitivity to measure this ACvoltagedrop across the resistor.
Any reading of 0.61 volt RMS or more is excessive and indicates a
potential shock hazard which must be corrected before returning the
receiver to the owner.
X-RAY PROTECTOR CIRCUIT CHECK
PERFORM WHENEVER HIGH VOLTAGE CIRCUITRY OR POWER
SUPPLY CIRCUITRY IS SERVICED.
1. Plug the AC Line Cord (P1) into a AC 120V, 60Hz receptacle.
2. Turn the Power Switch (S101) on and wait for about 10 minutes.
3. Connect the antenna leads to the EXT. Antenna Terminal (TE1)
and select a broadcasting station.
4. Connect DC Digital Voltmeter to TP11 (positive lead) and TP4
(negative lead).
5. Apply DC 11V betweenTP11 andTP4 from external equipment.
6. If picture and sound do not disappear, check IC301, D552, D553,
D554, R554, R555, R556, R557, C555 and C556.
AC
VOLTMETER
1500 OHMS
0.15 µF
TEST
PROBE
TO EXPOSED
METAL PARTS
TO KNOWN
EARTH GROUND

( ADJUSTMENT BY REMOTE CONTROL )
-3 -
ADJUSTMENT MODE
The following adjustment items can be performed from menus by Remote Control as shown
below :
NOTE: The button combination and position on the Remote Control to select the
adjustment items is given on page 4.
1. Press the SHIFT + ADJ. MODE buttons on the Remote Control simultaneously to bring up
the adjustment mode menu screens shown below.
2. From the menu screen, press the + or -button on the Remote Control to select the item to
be adjusted.
3. Press the MENU button on the Remote Control to enter adjustment mode for the item
selected, and the display shown below appears :
Example:
4. Use the + or -button on the Remote Control to adjust the data for the item selected.
5. When adjustment has been completed, press the SHIFT + ADJ. MODE buttons on the
Remote Control simultaneously to return to the main menu.
COLOR 32
RED CUTOFF 127
OR

REMOTE CONTROL LAYOUT
-4 -
METHOD OF RECALL V-BLOCK PASS NUMBER
If user forgets the V-Block Pass Number, call recall by the Service Remote Control or User
Remote Control.
1. If use the Service Remote Control, at the Pass Number entry menu, while holding down
[SHIFT] button and press the [Q.REV] button repeatedly four times.
2. If use the User Remote Control, at the Pass Number entry menu, while holding down
[VOLUME DOWN] button on the TV set and press number [3] button on the remote control
repeatedly four times.
3. The blinking “?” will be replaced with “!” after each press.
4. Release the [SHIFT] button or [VOLUME DOWN] button and then press [MENU] button. “V-
BLOCK SET” menu will be appearing on-screen with the user setting pass number.
VIDEOVIDEO
VIDEO

- 5-
INTEGRATED CIRCUITS
IC101 TA87C-B6Microcomputer IC601 STR30130 AVR
IC102 CAT24C04 EEPROM IC671 NJ7805LD Voltage Regulator and Reset
IC301 TA1268N IF/Video/Chroma/Deflection IC701 TLP651 Photo-Coupler
IC311 NJ7809FAVoltage Regulator IC702 TLP631 Photo-Coupler
IC501 AN5512 Vertical Deflection Output
TRANSISTORS
Q101 DTC143ZS Vertical Synchronizing Q551 2SC1473A(R) Horizontal Driver
Q102 2SC945(P) Horizontal Synchronizing Q552 2SD1877 Horizontal Driver
Q173 2SC945(P) SD Signal Buffer Q601 2SC945(P) Power On/Off Relay Driver
Q301 2SC945(P) SIF Signal Buffer Q701 2SC945(P) External Video In
Q302 2SA733(P) Video Buffer Amplifier Q703 2SC945(P) External Audio In
Q303 2SC945(P) Video Out Q751 2SC945(P) Video Amplifier
Q304 2SA733(P) Video In Q752 2SC945(P) Audio Amplifier
Q351 DTC143ZS Service Mode Switching Q753 2SC945(P) Video Amplifier
Q451 2SC1573A(R) Red Color Driver Q801 2SC945(P) Audio Amplifier
Q452 2SC1573A(R) Blue Color Driver Q802 2SA950(0) Audio Amplifier
Q453 2SC1573A(R) Green Color Driver Q803 2SC2120(0) Audio Amplifier
PICTURE TUBE
V451 51GGD95X CRT (SUFFIX A) V451 A48LSD095XCRT (SUFFIX D)
V451 510UEB22(DY) CRT (SUFFIX B) V451 A48LGS30X CRT (SUFFIX E)
CHASSIS REMOVAL
1. Remove 4 screws (177) from Cabinet Back (AB) and remove Cabinet Back from rear.
2. Discharge anode lead at CRT chassis ground through a 10k ohm resistor.
3. Disconnect anode lead from CRT.
4. Disconnect CRT Socket P.C. board (PCB-2) from CRT(V451).
5. Disconnect 3 connectors (CN501 (DY501), CN601 (L601) and LCN801) from Main P.C. board (PCB-1).
6. When replacing chassis, reverse the above procedure making certain that all leads are fastened in their
original places.
CRT REMOVAL
CAUTION: Wear shatterproof goggles and exercise proper handling precautions when working around high
vacuum picture tubes.
1. Remove chassis per instructions under CHASSIS REMOVAL.
2. Remove Convergence Magnet Assembly (MG451) from neck of CRT.
3. Remove Deflection Yoke (DY501) from neck of CRT
4. Remove 3 wedges (142) from CRT
5. Remove Degaussing Coil (L601) from CRT
6. Remove braid wire (331) and spring (158) from CRT
7. Lay cabinet face down on some protective material.
8. Remove 4 CRT mounting screws (156).
9. Remove CRT from Cabinet Front (AA).
10. To install new CRT, reverse above procedure.
11. Perform purity and convergence adjustments.
IC, TRANSISTOR AND CRT COMPLEMENT
V451 A48LRH93X(W) CRT (SUFFIX C)

- 6 -
CAUTION: Use an isolation transformer when performing any service on this chassis.
SHUTDOWN CIRCUIT: When the high voltage rises, there are simultaneous voltage increase developed at termi-
nal 5 of the Horizontal Output Transformer (T671) and applied to pin 29 of IC301. If excessive high voltage is
produced, the increased voltage developed exceeds the rating of zener diode D552 causing the Horizontal Oscil-
lator to stop functioning and the high voltage system to shut down.
AFT (AUTOMATIC FINETUNING) ADJUSTMENT
1. Connect TV Test Pattern Generator (NTSC signal, Monoscope signal, 70dBu, channel 2) to EXT. Antenna
Terminal (TE1) through TV Channel Signal Generator.
2. Connect wire (+) of DC Digital Voltmeter toTP6 and wire (-) to TP4.(Fig. 1)
3. Adjust T202 so that the DC DigitalVoltmeter reading is 2.0V ± 0.1V.
Fig. 1
SUBTINT ADJUSTMENT
1. Connect TV Test Pattern Generator (NTSC signal, Color Bar signal, 70dB u , channel 6) to EXT. Antenna
Terminal (TE1) through TV Channel Signal Generator.
2. Connect positive lead of Oscilloscope to TP14 and negative lead to TP4.
3. Connect EXT. trigger of Oscilloscope to R463.
4. Set Tint control to center position.(by Remote Control).
(NOTE: For steps 5, 6 and 7 below, refer to page 3 for Adjustment By Remote Control Method.)
5. Go to Adjustment Mode (1) by remote control.
6. Select SUB TINT from Adjustment Mode (1) menu screen.
7. Adjust SUB TINT level (by using + or - button on remote control) so that waveform is the same as shown in
Fig. 2.
INSTALLATION AND SERVICE INSTRUCTION
Fig. 2
1234
H
SUB COLOR
SUBTINT H
1
23
4
(INCORRECT) (CORRECT)
FLATTEN CURVES

- 7-
SOUND IF ADJUSTMENT
1. Connect TV Test Pattern Generator (NTSC signal, 70dB u, channel 2) to EXT. Antenna Terminal (TE1) through
TV Channel Signal Generator. (Standard modulation is 400Hz at 25kHz deviation for sound signal.
2. Connect positive lead of DC Digital Voltmeter to TP7 and negative lead to TP4.
3. Adjust T203 so that the DC Digital Voltmeter reading is 4.0V.
COLOR PURITY ADJUSTMENT
For best results, it is recommended that the purity adjustment be made in the final receiver location. If the receiver
will be moved, perform this adjustment with it facing East.
The receiver must have been operating 15 minutes prior to this procedure and the face plate of the CRT must be at
room temperature. The following procedure is recommended while using a Dot/Bar Generator.
1. Check correct location of all neck components. (Refer to Fig. 3)
2. Rough-in the static convergence at the center of the CRT, as explained in the static convergence procedure.
3. Set the Contrast control to minimum position and Brightness control as far maximum as possible without
causing the picture to “bloom”.
4. Apply green raster signal from Dot/Bar Generator to receiver.
5. Loosen the deflection yoke clamp screw and pull the deflection yoke toward the rear of the CRT.
6. Begin the following adjustment with the tabs on the round purity magnet rings set together. Slowly separate
the two tabs while at the same time rotating them to adjust for a uniform green vertical band at the center of
the CRT screen.
7. Carefully slide the deflection yoke forward to achieve green purity (Uniform green screen).
(NOTE: Center purity is obtained by adjusting the tabs on the round purity magnet rings. Outer edge purity is
obtained by sliding the deflection yoke forward.)
8. Check for red and blue field purity by applying red and blue raster signal alternately from Dot/Bar Generator to
receiver. Repeat steps 2 through 7, if required.
9. Tighten deflection yoke clamp screw.
10. Perform BLACK AND WHITE ADJUSTMENT procedure.
(CW : clockwise, CCW : counterclockwise)
Fig. 3
CLAMP SCREW
65.0mm
(2.56 inches)
CLAMP SCREW
6 POLE MAGNETS
4 POLE MAGNETS
PURITY MAGNETS
DEFLECTION YOKE

- 8 -
STATIC CONVERGENCE ADJUSTMENT (Refer to Fig. 3 and 4)
IMPORTANT: Before proceeding, make sure the location of the convergence magnet assembly on the neck of the
CRT is as shown in Fig.3. The rear edge of this assembly must be positioned 65 mm from the tip of the CRT base.
If not properly positioned, convergence adjustment may be difficult, if not impossible.
1. Apply dot or crosshatch pattern from Dot/Bar Generator to receiver. Reduce setting of Brightness and/or
Contrast controls to eliminate any blooming in pattern.
2. Observe the blue and red pattern appearing on the CRT screen.Locate the 4 pole magnet rings and separate
their adjusting tabs approximately the width of one tab.
3. Now rotate this pair of magnet rings as a unit without re-adjusting the spacing between the tabs. This will
minimize the separation between the blue and red dots (lines).
4. If the blue and red dots are not completely converged at this point, readjust the spacing between the two tabs
to complete convergence of the blue and red dots (lines), thus producing magenta dots (lines).
5. If necessary, repeat step 2, 3 and 4 until proper convergence is achieved.
6. Observe the magenta (B/R) and green pattern now appearing on the CRT screen.
7. Locate the 6 pole magnet rings and separate their adjusting tabs approximately the width of one tab.
8. Rotate this pair of magnet rings as a unit without re-adjusting the spacing between the tabs.This will minimize
the separation between the magenta (B/R) and green dots (lines).
9. If the magenta and green dots (lines) are not completely converged at these points, readjust the spacing
between the two tabs to complete convergence of the magenta and green dots (lines).
10. If necessary, repeat step 7, 8 and 9 until proper convergence is obtained.
To prevent accidental mis-adjustment of the magnets, apply a stripe of paint across all six rings and onto the
neck of the CRT.
Fig. 4
DYNAMIC CONVERGENCE ADJUSTMENT (Refer to Fig. 5)
Dynamic convergence (convergence of the three edges of the CRT screen) is accomplished by proper insertion
and positioning of three rubber wedges between the edges of the deflection yoke and funnel of the CRT.This is
accomplished in the following manner.
1. Turn the receiver ON and allow it to warm up for 15 minutes.
2. Apply crosshatch pattern from Dot/Bar Generator to receiver. Observe spacing between lines around edges
of CRT screen.
3. For the misconvergence shown in Fig.5 (A), tilt the deflection yoke down and insert wedge A between deflec-
tion yoke and CRT.
4. For the misconvergence shown in Fig.5 (B), tilt the deflection yoke up and insert wedge B between deflection
yoke and CRT.
5. For the misconvergence shown in Fig. 5 (C), tilt left side of the deflection yoke and slightly insert wedge C
between deflection yoke and CRT.Then, deeply insert wedges A and B between deflection yoke and CRT.
6. For the misconvergence shown in Fig.5 (D), tilt right side of the deflection yoke and deeply insert wedge C
between deflection yoke and CRT.Then, slightly insert and/or extract wedges A and B between deflection
yoke and CRT.
7. Alternately change spacing between and depth of insertion of the three wedges until proper dynamic conver-
gence is obtained.
8. Use a strong adhesive tape to firmly secure each of the three rubber wedges to the funnel of the CRT.
RED
GREEN
BLUE
GREEN
RED
BLUE
BLUE
GREEN
/RED
BLUE
GREEN
RED
BLUE
GREEN
/RED
BLUE
GREEN
/RED
BLUE
/GREEN
/RED
BLUE
GREEN
/RED

- 9 -
FOCUS ADJUSTMENT
Adjust focus control, located on the Horizontal OutputTransformer (T671), for maximum overall definition and fine
picture detail with Brightness and Contrast controls set at normal viewing levels.
BLACK ANDWHITE ADJUSTMENT (CUTOFF /WHITE BALANCE)
The purpose of this procedure is to adjust the bias applied to the color picture tube for reproducing a quality
monochrome picture at all brightness levels and also to achieve maximum usable brightness.Confirm that proper
purity and AGC adjustments have been completed before starting this adjustment.
1. Connect the TV test pattern generator (Monoscope pattern) to the EXT. antenna terminal via TV VHF/UHF
signal generator (NTSC signal, 70dB u).
2. Select Cutoff Mode by remote control, (refer to page 4 for remote control key combination and position) and
CUT OFF will be displayed on top-right screen for about 3 seconds. At the same time the data readings for
Cutoff and Gain in Adjustment Mode (2) will become as follows:
R CUTOFF: 50, G CUTOFF: 50, B CUTOFF: 50, G GAIN: 127, B GAIN: 127
3. Select Service Mode by remote control, (refer to page 4 for remote control key combination and position) and
TV screen becomes horizontal line.
4. Turn the Screen control (located under the flyback transformer) clockwise until any blue, green or red color
line appears.
5. Check the color of the line which appeared first, then turn the Screen control (located under the flyback
transformer) fully counterclockwise.
6. Adjust the cutoff level of the color which appeared first by remote control, (refer to page 4 for remote control
key combination and position) so that voltage betweenTP16 and TP15 (blue),TP14 (green) or TP13 (red) is
20 ± 1V.
7. Turn the Screen control (located under the flyback transformer) clockwise so that the bright color line can just
be seen.
8. Adjust cutoff levels other than the above by remote control, (refer to page 4 for remote control key combination
and position) so that the line color is white.
9. Press again Service Mode key by remote control, (refer to page 4 for remote control key combination and
position) to return to TV position.Monoscope pattern will appear on TV screen.
10. Adjust the contrast and brightness controls to make the picture dim.Adjust the Green and Blue Cutoff levels
byremote control,(referto page4 forremote controlkeycombination andposition) sothat thepicture iswhite.
11. Adjust the contrast and brightness controls to make the picture bright.Adjust the Green and Blue Gain levels
byremote control,(referto page4 forremote controlkeycombination andposition) sothat thepicture iswhite.
12. Repeat steps 10 and 11 so that the picture is white in both dim and bright conditions.
Fig. 5
GREEN
RED BLUE
(
A
)
RED
GREEN
BLUE
WEDGE A
DEFLECTION YOKE REAR VIEW
GREEN
BLUE RED
GREEN
RED BLUE
BLUE
GREEN
RED
RED
GREEN
BLUE
(C)
WEDGE A
WEDGE B
WEDGE C
DEFLECTION YOKE REAR VIEW
GREEN
BLUE RED
(
B
)
BLUE
GREEN
RED
WEDGE B
DEFLECTION YOKE REAR VIEW
GREEN
RED BLUE
GREEN
BLUE RED
RED
GREEN
BLUE
BLUE
GREEN
RED
(
D
)
WEDGE A
WEDGE B
WEDGE C
DEFLECTION YOKE REAR VIEW

- 10 -
HORIZONTAL PHASE ADJUSTMENT
1. Connect TV Test pattern Generator (NTSC signal 70dB u, Monoscope Pattern) to EXT. Antenna Terminal
(TE1) through TV Channel Generator.
(NOTE: For steps 2, 3 and 4 below, refer to page 3 for Adjustment By Remote Control Method).
2. Go to Adjustment Mode (2) by remote control.
3. Select H. PHASE from Adjustment Mode (2) menu screen.
4. Adjust H. PHASE level (by using + or - button on remote control) so that horizontal reading of test pattern
becomes the same value.
VERTICAL PHASE ADJUSTMENT
1. Connect TV Test pattern Generator (NTSC signal 70dB u, Monoscope Pattern) to EXT. Antenna Terminal
(TE1) through TV Channel Generator.
(NOTE: For steps 2, 3 and 4 below, refer to page 3 for Adjustment By Remote Control Method).
2. Go to Adjustment Mode (2) by remote control.
3. Select V. PHASE from Adjustment Mode (2) menu screen.
4. Adjust V. PHASE level (by using + or - button on remote control) so that vertical reading of test pattern
becomes the same value.
VERTICAL AMPLITUDE ADJUSTMENT
1. Connect TV Test pattern Generator (NTSC signal 70dB u, Monoscope Pattern) to EXT. Antenna Terminal
(TE1) through TV Channel Generator.
(NOTE: For steps 2, 3 and 4 below, refer to page 3 for Adjustment By Remote Control Method).
2. Go to Adjustment Mode (2) by remote control.
3. Select V. AMP from Adjustment Mode (2) menu screen.
4. AdjustV. AMP level (by using + or - button on remote control) so that picture fills the picture opening from top
to bottom and is proportionate to the width.
RF AGC ADJUSTMENT
1. Connect TV Channel Signal Generator to EXT.Antenna Terminal (TE1).
2. Connect positive lead of DC Digital Voltmeter to TP5 and negative lead of DC DigitalVoltmeter toTP4.
3. Adjust level ofTV Channel signal Generator so that the output level is 55dB u. (Monoscope Pattern)
(NOTE: For steps 4, 5 and 6 below, refer to page 3 for Adjustment By Remote Control Method).
4. Go to Adjustment Mode (2) by remote control.
5. Select RF AGC from Adjustment Mode (2) menu screen.
6. Adjust RF AGC level (by using + or - button on remote control) so that the DC DigitalVoltmeter reading is 6.0V
± 0.2V.
SUB BRIGHTNESS ADJUSTMENT
1. ConnectTVTestPattern Generator(NTSC signal,Color BarSignal, 70dBu) toEXT.AntennaTerminal through
TV Channel Signal Generator.
2. Set Brightness, Tint and Sharpness menu option to center. Set Color and Contrast menu option to
minimum (by Remote Control).
(NOTE: For steps 3, 4 and 5 below, refer to page 3 for Adjustment By Remote Control Method).
3. Go to Adjustment Mode (1) by remote control.
4. Select SUB BRI. from Adjustment Mode (1) menu screen.
5. Adjust SUB BRI. level (by using + or - button on remote control) to obtain a dim pattern. (Refer to Fig.6)
Fig. 6
DIM LIGHT

- 11 -
VIDEO IN ADJUSTMENT
1. Connect Pattern Generator (1Vp-p, Color Bar Pattern) to video jack (J701).
2. Connect positive lead of Oscilloscope probe 1 to R703 and negative lead of Oscilloscope to TP4 to detect
video in signal.
3. Connect positive lead of Oscilloscope probe 2 toTP10 and negative lead of Oscilloscope to TP4.
4. Select Video Mode by remote control.
5. Compare the waveform probe 2 with waveform probe 1.
6. AdjustVR701 to get the waveform atTP10 andTP4 is 0.9Vp-p ± 0.1Vp-p same with the waveform at probe 1.
(Refer to Fig.7)
Fig. 7
AUDIO IN ADJUSTMENT
1. Connect Pattern Generator (1Vp-p, Color Bar Pattern) to video jack (J701).
2. Connect Audio Generator to audio jack (J702).
3. Connect positive lead of Oscilloscope probe 1 to R705 and negative lead of Oscilloscope to TP4 to detect
audio in signal.
4. Connect positive lead of Oscilloscope probe 2 toTP9 and negative lead of Oscilloscope to TP4.
5. Select Video Mode by remote control.
6. Compare the waveform probe 2 with waveform probe 1.
7. AdjustVR702 to get the waveform atTP9 andTP4 is 1.0Vp-p ± 0.05Vp-p same with the waveform at probe 1.
(Refer to Fig.8)
Fig. 8

- 12 -
TEST POINT

- 13 -
VOLTAGE CHART (all in volts)
OPERATION CONDITION: TINT, BRIGHT and COLOR CONTROL............................ CENTER
CONTRAST ......................................................................MAXIMUM
COLOR BAR SIGNAL
IC101 TERMINAL No 12345678910
Volt 0.0 0.0 0.0 0.0 5.0 5.0 0.0 0.0 0.0 4.9
TERMINAL No 11 12 13 14 15 16 17 18 19 20
Volt 5.0 0.0 5.0 5.0 5.0 2.1 0.0 0.0 4.9 4.9
TERMINAL No 21 22 23 24 25 26 27 28 29 30
Volt 4.9 0.0 0.0 0.0 0.0 4.0 4.5 4.7 4.8 0.0
TERMINAL No 31 32 33 34 35 36 37 38 39 40
Volt 2.0 2.2 5.0 0.0 5.0 4.4 2.7 2.4 0.0 2.0
TERMINAL No 41 42
Volt 3.0 5.0
IC102 TERMINAL No 12345678
Volt 0.0 0.0 0.0 0.0 2.3 2.7 0.0 5.0
IC301 TERMINAL No 12345678910
Volt 0.0 3.7 3.2 3.3 4.6 0.0 2.0 0.7 8.8 4.4
TERMINAL No 11 12 13 14 15 16 17 18 19 20
Volt 6.2 4.7 0.0 0.0 4.7 4.8 4.8 3.3 2.2 2.2
TERMINAL No 21 22 23 24 25 26 27 28 29 30
Volt 2.3 0.7 4.7 4.8 5.5 8.2 2.7 2.2 1.5 1.2
TERMINAL No 31 32 33 34 35 36 37 38 39 40
Volt 0.7 1.2 6.8 5.3 0.0 2.8 3.2 3.0 1.6 5.2
TERMINAL No 41 42 43 44 45 46 47 48 49 50
Volt 3.0 4.7 4.6 2.0 1.8 8.8 4.0 8.8 7.8 7.8
TERMINAL No 51 52 53 54 55 56
Volt 0.0 0.0 2.8 4.3 2.8 0.0
IC311 TERMINAL No 123
Volt 16.0 0.0 9.0
IC501 TERMINAL No 123456789
Volt 0.0 12.6 0.0 23.0 13.6 0.7 -0.3 1.7 22.4
IC601 TERMINAL No 12345
Volt 0.0 118.0 124.0 118.0 0.0
IC671 TERMINAL No 12345678
Volt 14.0 0.0 5.5 0.0 0.0 4.9 0.0 5.0
IC701 TERMINAL No 12345678
Volt 0.0 7.7 6.5 0.0 0.0 1.2 0.7 8.8
IC702 TERMINAL No 123456
Volt 7.7 6.8 0.0 0.0 1.0 0.6
BEC
Volt Volt Volt
Q551 0.3 0.0 80.0
Q552 -0.2 0.0 -
Q601 0.7 0.0 0.2
Q701 2.1 1.6 6.6
Q703 2.2 1.7 7.0
Q751 1.2 0.5 3.6
Q752 1.0 0.4 5.1
Q753 3.6 3.0 8.9
Q801 0.7 0.0 7.1
Q802 8.3 7.7 14.4
Q803 7.1 7.7 0.0
BEC
Volt Volt Volt
Q101 0.1 0.0 4.6
Q102 -0.4 0.0 4.0
Q173 -0.1 0.0 4.5
Q301 3.9 3.9 8.8
Q302 1.5 2.1 0.0
Q303 1.6 1.0 8.8
Q304 3.0 3.6 0.0
Q351 0.0 0.0 8.8
Q451 2.2 2.1 126
Q452 2.3 2.2 120
Q453 2.2 2.1 127

- 14 -
CHASSIS WAVEFORM
NOTES:
WAVEFORMS SHOWN WERE PRODUCED USING A PATTERN GENERETOR WITH ITS CONTROL SET TO
PRODUCE A COLOR BAR SIGNAL AND A WIDEBAND OSCILLOSCOPE WITH LOW CAPACITY PROBE TO
PREVENT LOADING. RECEIVER OPERATING CONTROLS WERE ADJUSTED TO PRODUCE A NORMAL
PICTURE. OSCILLOSCOPE SWEEP WAS SET AT 5mS FOR VERTICAL WAVEFORMS AND 20uS FOR
HORIZONTALWAVEFORMS. PEAK-TO-PEAKVOLTAGESINDICATEDMAYVARYDEPENDING ON CALIBRATION
OF TEST EQUIPMENT, CHASSIS PARTS TOLERENCES AND CONTROL SETTINGS. ALL WAVEFORMS ARE
TAKEN WITH WIDEBAND OSCILLOSCOPE VOLTAGES AND WAVEFORMS ARE TAKEN WITH COLOR BAR
SIGNAL GENERATOR APPLIEDTOTHE SET.
WF-7 27.0Vp-p(V) WF-8 195.0Vp-p(H) WF-9 0.75Vp-p(H)
WF-4 2.4Vp-p(V) WF-5 27.4Vp-p(H) WF-6 21.0Vp-p(H)
WF-1 1.0Vp-p(H) WF-2 9.7Vp-p(H) WF-3 50.0Vp-p(V)

- 15 -
WIRING DIAGRAM

EXPLODED VIEW
-16 -
142
158

- 17-
SCHEMATIC DIAGRAM
MCT5525 S/M p14-17 6/6/01, 9:29 AM16

Part No. Description Part No. Description
GENERAL UNIT PARTS LIST MISCELLANEOUS
127 1532-26001 Window DY501 4993-119 Coil Deflection Yoke SUFFIX D
128 1662-79801 Push Button DY501 4993-123 Coil Deflection Yoke SUFFIX E
142 2132-412 Wedge Deflection Yoke;SPACER(x3) LCN801 4163-06038003 Connector with Lead Wire;(SP)
146 2133-334 Protector;BUTTON MG1 4291-034 Magnet Assembly SUFFIX A
151 2222-379 Heat Sink;CA MG1 4291-031 Magnet Assembly SUFFIX C
152 2222-294 Heat Sink;CA MG1 4291-031 Magnet Assembly SUFFIX E
153 2222-302 Heat Sink;CA SP801 5812-0101G750 Speaker
156 2340-065 Screw (+);(x4) V451 5721-015ST51N CRT;(51GGD95X) SUFFIX A
158 2651-0000199 Spring CRT;WIRE V451 5721-51CN020T CRT;(510UEB22DY) SUFFIX B
161 2240-581 Holder V451 5721-028TT48N CRT;(A48LRH93X) SUFFIX C
162 2240-755 Holder;(x4) V451 5721-029NT48N CRT;(A48LSD095X) SUFFIX D
163 2240-742 Holder;CORD V451 5721-031ZT48N CRT;(A48LGS30X) SUFFIX E
166 2240-7052 Holder Wiring 121 6142-09010 Infrared Remote Control;CONTROL
167 2240-7051 Holder Wiring;DY L601/CRT WIRE,JL101 331 4105-01102 CRT Wire;(CRT GND)
168 2240-R0101 Holder Wiring; DEGAUS*2(x4)
173 2347-R0130082 Self-Tapping Screw (+) (3x8 mm);(x3);CA
174 2347-R0130102 Self-Tapping Screw (+) (3x10 mm);(x2);CA
176 2347-R0140162 Self-Tapping Screw (+) (4x16 mm);(x12);CA CAPACITORS
177 2347-R0140162 Self-Tapping Screw (+) (4x16 mm);(x4)
178 2347-R0130082 Self-Tapping Screw (+) (3x8 mm);(x2) C4 5345-475-50 4.7 uF +-20% 50V Electrolytic
182 2347-R0130102 Self-Tapping Screw(+)(3x10mm);314,BUTTONx3(x5) C7 5345-337-16 330 uF +-20% 16V Electrolytic
145 2133-333 Protector;SENSOR;AA C8 5345-226-50 22 uF +-20% 50V Electrolytic
AA A412-19V1114C Cabinet;AA C101 5369-104144 0.1 uF +-10% 25V Semiconductor
AB A422-19V1114G Cabiback; SUFFIX A C102 5369-104144 0.1 uF +-10% 25V Semiconductor
AB A422-19V1114B Cabiback; SUFFIX B C103 5345-475-50 4.7 uF +-20% 50V Electrolytic
AB A422-19V1114C Cabiback; SUFFIX C C104 5361-270JCH 27 pF +-5% 50V Ceramic CH
AB A422-19V1114D Cabiback; SUFFIX D C105 5361-270JCH 27 pF +-5% 50V Ceramic CH
AB A422-19V1114E Cabiback; SUFFIX E C106 5361-300JCH 30 pF +-5% 50V Ceramic CH
C107 5345-107-10 100 uF +-20% 10V Electrolytic
ELECTRICAL PARTS LIST C108 V5369-S04FZ223 0.022 uF +80%-20% 25V Semiconductor
C109 S5361-S17CJ8R2 8.2 pF +-5% 50V Ceramic CH
C111 V5369-S05BK681 680 pF +-10% 50V Semiconductor
L601 4994-040 Coil C112 V5369-S05BK681 680 pF +-10% 50V Semiconductor
C126 V5361-S17BK561 560 pF +-10% 50V Ceramic B
MISCELLANEOUS C127 V5369-S05BK102 1000 pF +-10% 50V Semiconductor
C130 5361-101KB 100 pF +-10% 50V Ceramic B
DY501 4993-118 Coil Deflection Yoke SUFFIX A C177 V5361-S17BK271 270 pF +-10% 50V Ceramic B
DY501 4993-060 Coil Deflection Yoke SUFFIX B C180 V5361-S17BK101 100 pF +-10% 50V Ceramic B
DY501 4993-126 Coil Deflection Yoke SUFFIX C C206 V5369-S05BK102 1000 pF +-10% 50V Semiconductor
- 19 -
Ref No. Ref No.
COILS AND TRANSFORMER
PCB-1 MAIN P.C.BOARD (D551-19V1114A)