Memorex MT2327 User manual
SERVICE MANUAL
MT2327
Design and specifications are subject to change without notice.
COLORTELEVISION RECEIVER
ORIGINAL
MFR'S VERSION A
6. AVOID AN X-RAY1. KEEP THE NOTICES
5. TAKE CARE TO DEAL WITH THE
CATHODE-RAY TUBE
In the condition that an explosion-proof cathode-
ray tube is set in this equipment, safety is
secured against implosion. However, when
removing it or serving from backward, it is
dangerous to give a shock. Take enough care to
deal with it.
Safety is secured against an X-ray by consider-
ing about the cathode-ray tube and the high
voltage peripheral circuit, etc.
Therefore, when repairing the high voltage pe-
ripheral circuit, use the designated parts and
make sure not modify the circuit.
Repairing except indicates causes rising of high
voltage, and it emits an X-ray from the cathode-
ray tube.
Please include the following informations when you order parts. (Particularly the VERSION LETTER.)
1. MODEL NUMBER and VERSION LETTER
The MODEL NUMBER can be found on the back of each product and the VERSION LETTER can be
found at the end of the SERIAL NUMBER.
2. PART NO. and DESCRIPTION
You can find it in your SERVICE MANUAL.
Inferior silicon grease can damage IC's and transistors.
When replacing an IC's or transistors, use only specified silicon grease (YG6260M).
Remove all old silicon before applying new silicon.
IMPORTANT
HOWTO ORDER PARTS
SERVICING NOTICES ON CHECKING
As for the places which need special attentions,
they are indicated with the labels or seals on the
cabinet, chassis and parts. Make sure to keep the
indications and notices in the operation manual.
2. AVOID AN ELECTRIC SHOCK
There is a high voltage part inside. Avoid an
electric shock while the electric current is
flowing.
3. USE THE DESIGNATED PARTS
The parts in this equipment have the specific
characters of incombustibility and withstand
voltage for safety. Therefore, the part which is
replaced should be used the part which has
the same character.
Especially as to the important parts for safety
which is indicated in the circuit diagram or the
table of parts as a mark, the designated
parts must be used.
PUT PARTS AND WIRES IN THE
ORIGINAL POSITION AFTER
ASSEMBLING OR WIRING
4.
There are parts which use the insulation
material such as a tube or tape for safety, or
which are assembled in the condition that
these do not contact with the printed board.
The inside wiring is designed not to get closer
to the pyrogenic parts and high voltage parts.
Therefore, put these parts in the original
positions.
7.PERFORM A SAFETY CHECK AFTER
SERVICING
Confirm that the screws, parts and wiring which
were removed in order to service are put in the
original positions, or whether there are the
portions which are deteriorated around the
serviced places serviced or not. Check the
insulation between the antenna terminal or
external metal and the AC cord plug blades.
And be sure the safety of that.
(INSULATION CHECK PROCEDURE)
1.
2.
3.
4.
Unplug the plug from the AC outlet.
Remove the antenna terminal on TV and turn
on the TV.
Insulation resistance between the cord plug
terminals and the eternal exposure metal
[Note 2] should be more than 1M ohm by
using the 500V insulation resistance meter
[Note 1].
If the insulation resistance is less than 1M
ohm, the inspection repair should be
required.
[Note 1]
If you have not the 500V insulation
resistance meter, use a Tester.
[Note 2]
External exposure metal: Antenna terminal
A1-1
CONTENTS
SERVICING NOTICES ON CHECKING......................................................................................................
HOW TO ORDER PARTS ...........................................................................................................................
IMPORTANT................................................................................................................................................
CONTENTS ...............................................................................................................................................
GENERAL SPECIFICATIONS ....................................................................................................................
DISASSEMBLY INSTRUCTIONS
1. REMOVAL OF ANODE CAP ...........................................................................................................
2. REMOVAL AND INSTALLATION OF FLAT PACKAGE IC.............................................................
SERVICE MODE LIST.................................................................................................................................
CONFIRMATION OF HOURS USED ..........................................................................................................
WHEN REPLACING EEPROM (MEMORY) IC ...........................................................................................
ELECTRICAL ADJUSTMENTS ..................................................................................................................
BLOCK DIAGRAM ......................................................................................................................................
PRINTED CIRCUIT BOARDS
MAIN/CRT/STEREO..........................................................................................................................
MAIN/CRT..........................................................................................................................................
SCHEMATIC DIAGRAMS
MICON/TUNER..................................................................................................................................
CHROMA ...........................................................................................................................................
DEFLECTION/CRT............................................................................................................................
POWER .............................................................................................................................................
SOUND ..............................................................................................................................................
AV ......................................................................................................................................................
COMB/FILTER ...................................................................................................................................
AV JACK ...... ......................................................................................................................................
WAVEFORMS .............................................................................................................................................
MECHANICAL EXPLODED VIEW ..............................................................................................................
MECHANICAL REPLACEMENT PARTS LIST ..........................................................................................
ELECTRICAL REPLACEMENT PARTS LIST ............................................................................................
A2-1
A1-1
A1-1
A1-1
A2-1
A3-1~A3-4
B1-1
B2-1, B2-2
C-1
C-1
C-2
D-1~D-5
E-1, E-2
F-1, F-2
F-3, F-4
G-1, G-2
G-3, G-4
G-5, G-6
G-7, G-8
G-9, G-10
G-11, G-12
G-13, G-14
G-15, G-16
H-1, H-2
I-1
J1-1
J2-1, J2-2
GENERAL SPECIFICATIONS
G-1 TV CRT CRT Size / Visual Size 32 inch / 800.1mmV
System CRT Type Normal
Deflection 110 degree
Magnetic Field BV/BH +0.45G/0.18G
Color System NTSC
Speaker 2Speaker
Position Front
Size 1.8 x 3.9 Inch
Impedance 8 ohm
Sound Output MAX 5.0 + 5.0 W
10%(Typical) 4.0 + 4.0 W
NTSC3.58+4.43 /PAL60Hz No
G-2 Tuning Broadcasting System US System M
System Tuner and System 1Tuner
Receive CH Destination Others
Tuning System F-Synth
Input Impedance VHF/UHF 75 ohm
2 - 69, 4A, A-5 - A-1,
CH Coverage A - I, J - W, W+1 - W+84
Intermediate Picture(FP) 45.75MHz
Frequency Sound(FS) 41.25MHz
FP-FS 4.50MHz
Preset CH No
Stereo/Dual TV Sound Yes
Tuner Sound Muting Yes
G-3 Power Power Source AC 120V AC 60Hz
DC
Power Consumption at AC 130 W at AC 120 V 60 Hz
Stand by (at AC) 5 W at AC 120 V 60 Hz
Per Year -- kWh/Year
Protector Power Fuse Yes
G-4 Regulation Safety UL / CSA
Radiation FCC / IC
X-Radiation DHHS / HWC
G-5 Temperature Operation +
5
o
C
~ +4
0
o
C
Storage -2
0
o
C
~ +
60
o
C
G-6 Operating Humidity Less than 80% RH
G-7 On Screen Menu Yes
Display Menu Type Character
Picture Yes
Contrast Yes
Brightness Yes
Color Yes
Tint Yes
Sharpness Yes
Audio Yes
Bass Yes
Treble Yes
Balance Yes
BBE On/Off No
Stable Sound On/Off No
CH Set Up Yes
TV/CATV Yes
Auto CH Memory Yes
Add/Delete Yes
Language Yes
V-chip No
CH Label No
Favorite CH No
Color Stream DVD/DTV No
Control Level Yes
Volume Yes
Brightness Yes
Contrast Yes
Color Yes
Tint (NTSC Only) Yes
Sharpness Yes
Tuning No
Bass Yes
Treble Yes
Balance Yes
Back Light No
Stereo,Audio Output,SAP Yes
Video Yes
Color Stream No
Channel(TV/Cable) Yes
A3-1
GENERAL SPECIFICATIONS
CH Label No
Sleep Timer Yes
Sound Mute Yes
V-chip Rating No
G-8 OSD Language English French Spanish
G-9 Clock and Sleep Timer Max Time 120 Min
Timer Step 10 Min
On/Off Timer Program(On Timer / Off Timer) No
Wake Up Timer No
Timer Back-up (at Power Off Mode) more than -- Min Sec
G-10 Remote Unit RC-DJ
Control Glow in Dark Remocon No
Format NEC
Custom Code 86-05 h
Power Source Voltage(D.C) 3V
UM size x pcs UM-4 x 2 pcs
Total Keys 42 Keys
Keys Power Yes
1 Yes
2 Yes
3 Yes
4 Yes
5 Yes
6 Yes
7 Yes
8 Yes
9 Yes
0 Yes
100 No
CH Up Yes
CH Down Yes
Volume Up Yes
Volume Down Yes
TV/Caption/Text Yes
CH1/CH2 Yes
TV/Video(TV/AV) Yes
CH RTN/CH ENT(Quick View) Yes
Sleep Yes
RE Call(Call) Yes
Reset Yes
Menu Yes
Enter Yes
Mute Yes
Exit No
MTS(Audio Select) Yes
Set + Yes
Set - Yes
Multi Brand Keys CH Up(VCR) Yes
CH Down(VCR) Yes
Pause/Still Yes
TV/VCR(VCR) Yes
CH Enter Yes
Code Set (Code) Yes
FF Yes
Rew Yes
Rec Yes
Play Yes
Stop Yes
TV Yes
VCR Yes
Cable Yes
G-11 Features Auto Degauss Yes
Auto Shut Off Yes
Canal+ No
CATV Yes
Anti-theft No
Rental No
Memory(Last CH) Yes
Memory(Last Volume) Yes
V-Chip No
Type -
BBE No
Auto Search No
CH Allocation No
SAP Yes
Channel Lock No
A3-2
GENERAL SPECIFICATIONS
Just Clock Function No
Game Position No
CH Label No
VM Circuit No
Full OSD No
Premiere No
Comb Filter Yes
2 Lines
Auto CH Memory Yes
Hotel Lock No
Closed Caption Yes
Stable Sound No
Energy Star No
Power On Memory No
Favorite CH No
G-12 Accessories Owner's Manual Language English / French
w/Guarantee Card Yes
Remote Control Unit Yes
Rod Antenna No
Poles
Terminal
Loop Antenna No
Terminal
U/V Mixer No
DC Car Cord (Center+) No
Guarantee Card No
Warning Sheet No
Circuit Diagram No
Antenna Change Plug No
Service Facility List No
Important Safeguard No
Dew/AHC Caution Sheet No
AC Plug Adapter No
Quick Set-up Sheet No
Battery No
UM size x pcs
OEM Brand No
AC Cord No
AV Cord (2Pin-1Pin) No
Registration Card No
PTB Sheet No
300 ohm to 75 ohm Antenna Adapter No
G-13 Interface Switch Front Power Yes
System Select No
Main Power SW No
Sub Power No
Channel Up/Reset Yes
Channel Down/Enter Yes
Volume Up/Set Up Yes
Volume Down/Set Down Yes
Menu: Vol Up + Vol Down Yes
Rear AC/DC No
TV/CATV Selector No
Degauss No
Main Power SW No
Indicator Power No
Stand-by No
On Timer No
Terminals Front Video Input RCA
Audio Input RCA x 2
Other Terminal No
Rear Video Input(Rear1) RCA
Video Input(Rear2) No
Audio Input(Rear1) RCA x 2
Audio Input(Rear2) No
Video Output RCA
Audio Output RCA x 2
S-Input Yes
Color Stream No
Diversity No
Ext Speaker No
DC Jack 12V(Center +) No
VHF/UHF Antenna Input F Type
AC Outlet No
G-14 Set Size Approx. W x D x H (mm) 751 x 554 x 659
G-15 Weight Net (Approx.) 52.0kg (114.7 lbs)
Gross (Approx.) 58.0Kg ( 127.9 lbs)
A3-3
GENERAL SPECIFICATIONS
G-16 Carton Master Carton No
Content ---- Sets
Material -- /--
Dimensions W x D x H(mm) -- x -- x --
Description of Origin No
Gift Box Yes
Material Double/WHITE CORRUGATED CARTON
Dimensions W x D x H(mm) 840 x 625 x 757
Design As per Buyer's
Description of Origin Yes
Drop Test Natural Dropping At 1 Corner / 3 Edges / 6
Surfaces
Height (cm) 25
Container Stuffing 104 Sets/40' container
G-17 Material Cabinet Cabinet Front PS 94V0 DECABROM
Cabinet Rear PS 94V0 DECABROM
PCB Non-Halogen Demand No
Eyelet Demand No
A3-4
1. REMOVAL OF ANODE CAP
Read the following NOTED items before starting work.
After turning the power off there might still be a potential
voltage that is very dangerous. When removing the
Anode Cap, make sure to discharge the Anode Cap's
potential voltage.
Do not use pliers to loosen or tighten the Anode Cap
terminal, this may cause the spring to be damaged.
REMOVAL
1. Follow the steps as follows to discharge the Anode Cap.
(Refer to Fig. 1-1.)
Connect one end of an Alligator Clip to the metal part of
a flat-blade screwdriver and the other end to ground.
While holding the plastic part of the insulated screwdriver,
touch the support of the Anode with the tip of the
screwdriver.
A cracking noise will be heard as the voltage is discharged.
Flip up the sides of the Rubber Cap in the direction of the
arrow and remove one side of the support.
(Refer to Fig. 1-2.)
2.
GND on the CRT
Screwdriver
Alligator Clip
Support CRT
GND on the CRT
Rubber Cap
CRT Support Fig. 1-2
3. After one side is removed, pull in the opposite direction to
remove the other.
NOTE
Take care not to damage the Rubber Cap.
INSTALLATION
1. Clean the spot where the cap was located with a small
amount of alcohol. (Refer to Fig. 1-3.)
Location of Anode Cap
NOTE
Confirm that there is no dirt, dust, etc. at the spot where
the cap was located.
2.
3.
Arrange the wire of the Anode Cap and make sure the
wire is not twisted.
Turn over the Rubber Cap. (Refer to Fig. 1-4.)
4. Insert one end of the Anode Support into the anode button,
then the other as shown in Fig. 1-5.
5.
6. Confirm that the Support is securely connected.
Put on the Rubber Cap without moving any parts.
CRT Support
DISASSEMBLY INSTRUCTIONS
Fig. 1-3
Fig. 1-4
Fig. 1-5
*
*
Fig. 1-1
B1-1
Masking Tape
(Cotton Tape)
DISASSEMBLY INSTRUCTIONS
2.
REMOVAL
IC
Put the Masking Tape (cotton tape) around the Flat
Package IC to protect other parts from any damage.
(Refer to Fig. 2-1.)
1.
Fig. 2-1
NOTE
REMOVAL AND INSTALLATION OF
FLAT PACKAGE IC
Some ICs on the PCB are affixed with glue, so be
careful not to break or damage the foil of each IC
leads or solder lands under the IC when removing it.
NOTE
Masking is carried out on all the parts located within
10 mm distance from IC leads.
Blower type IC
desoldering machine
IC
Heat the IC leads using a blower type IC desoldering
machine. (Refer to Fig. 2-2.)
2.
Fig. 2-2
NOTE
Do not add the rotating and the back and forth
directions force on the IC, until IC can move back and
forth easily after desoldering the IC leads completely.
When IC starts moving back and forth easily after
desoldering completely, pickup the corner of the IC using
a tweezers and remove the IC by moving with the IC
desoldering machine. (Refer to Fig. 2-3.)
3.
Blower type IC
desoldering
machine
IC Fig. 2-3
Tweezers
Peel off the Masking Tape.4.
B2-1
Absorb the solder left on the pattern using the Braided
Shield Wire. (Refer to Fig. 2-4.)
5.
NOTE
Do not move the Braided Shield Wire in the vertical
direction towards the IC pattern.
Braided Shield Wire
Soldering Iron
Fig. 2-4
IC pattern
DISASSEMBLY INSTRUCTIONS
Supply soldering
from upper position
to lower position
IC
Supply the solder from the upper position of IC leads
sliding to the lower position of the IC leads.
(Refer to Fig. 2-6.)
2.
Fig. 2-6
Soldering IronSolder
IC
Absorb the solder left on the lead using the Braided
Shield Wire. (Refer to Fig. 2-7.)
3.
Fig. 2-7
Soldering Iron
Braided Shield Wire
NOTE
Do not absorb the solder to excess.
IC
When bridge-soldering between terminals and/or the
soldering amount are not enough, resolder using a Thin-
tip Soldering Iron. (Refer to Fig. 2-8.)
4.
Fig. 2-8
Thin-tip Soldering Iron
NOTE
When the IC leads are bent during soldering and/or
repairing, do not repair the bending of leads. If the
bending of leads are repaired, the pattern may be
damaged. So, be always sure to replace the IC in this
case.
Finally, confirm the soldering status on four sides of the
IC using a magnifying glass.
Confirm that no abnormality is found on the soldering
position and installation position of the parts around the
IC. If some abnormality is found, correct by resoldering.
5.
Solder temporarily
Soldering Iron
INSTALLATION
Take care of the polarity of new IC and then install the
new IC fitting on the printed circuit pattern. Then solder
each lead on the diagonal positions of IC temporarily.
(Refer to Fig. 2-5.)
1.
Fig. 2-5
Solder temporarily
B2-2
SERVICE MODE LIST
This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily.
To enter the Service Mode, press both set key and remote control key for more than 1 second.
Set Key Remocon Key Operations
VOL. (-) MIN 0Releasing of V-CHIP PASSWORD.
VOL. (-) MIN 1 Initialization of the factory.
NOTE: Do not use this for the normal servicing.
If you set a factory initialization, the memories are reset such as the clock
setting, the channel setting, the POWER ON total hours.
C-1
CONFIRMATION OF HOURS USED
VOL. (-) MIN 6
POWER ON total hours is displayed on the screen.
Refer to the "CONFIRMATION OF HOURS USED".
Can be checked of the INITIAL DATA of MEMORY IC.
Refer to the "WHEN REPLACING EEPROM (MEMORY) IC".
VOL. (-) MIN 8 Writing of EEPROM initial data.
NOTE: Do not use this for the normal servicing.
VOL. (-) MIN Display of the Adjustment MENU on the screen.
Refer to the "ELECTRICAL ADJUSTMENT" (On-Screen Display Adjustment).
9
POWER ON total hours can be checked on the screen. Total hours are displayed in 16 system of notation.
NOTE: If you set a factory initialization, the total hours is reset to "0".
1.
2.
3.
Set the VOLUME to minimum.
Press both VOL. DOWN button on the set and Channel
button (6) on the remote control for more than 2 second.
After the confirmation of using hours, turn off the power.
ADDRESS DATA
INIT 00 08
CRT ON 0010
FIG. 1
Initial setting content of MEMORY IC.
POWER ON total hours.
= (16 x 16 x 16 x thousands digit
value)
+ (16 x 16 x hundreds digit value)
+ (16 x tens digit value)
+ (ones digit value)
C-2
WHEN REPLACING EEPROM (MEMORY) IC
If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to
ensure correct data settings while making reference to TABLE 1.
+2
INI +0 +1 +3 +4 +A
+9
+5 +6 +7 +8 +F
+B +C +D +E
Table 1
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
The unit will now have the correct DATA for the new MEMORY IC.
Enter DATA SET mode by setting VOLUME to minimum.
Press both VOL. DOWN button on the set and Channel button (6) on the remote control for more than 20 second.
ADDRESS and DATA should appear as FIG 1.
ADDRESS is now selected and should "blink". Using the SET + or - keys on the remote, step through the ADDRESS until
required ADDRESS to be changed is reached.
Press ENTER to select DATA. When DATA is selected, it will "blink".
Again, step through the DATA using SET + or - until required DATA value has been selected.
Pressing ENTER will take you back to ADDRESS for further selection if necessary.
Repeat steps 3 to 6 until all data has been checked.
When satisfied correct DATA has been entered, turn POWER off (return to STANDBY MODE) to finish DATA input.
After the data input, set to the initializing of shipping.
Turn POWER on.
While holding down VOLUME button on front cabinet, press key 1 on remote control for more than 2 seconds.
After the finishing of the initializing of shipping, the unit will turn off automatically.
00 68 4408 30 8B 0A B7 24 3B 02 00 00 0C 3B 3D 0A
20 77 5956 76 57 77 58 58 78 78 59 79 79 5A 5A 5A
40 5E 5F5D 5D 7D 7D 7E 7E 5F 5F 5F 7F 7F 7F 7F 7F
10 48 5062 45 26 07 4A 6B 4D 4E 4F 51 52 53 54 55
30 5B 5C7A 7A 7A 5B 5B 7B 7B 7B 5C 5C 7C 7C 7C 5D
ELECTRICAL ADJUSTMENTS
1.
Read and perform these adjustments when repairing the
circuits or replacing electrical parts or PCB assemblies.
CAUTION
2. BASIC ADJUSTMENTS
2-1: RF AGC
Place the set with Aging Test for more than 15 minutes.
Receive an 63dB ±1dB monoscope pattern.
Connect the digital voltmeter to the TP001.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (02) on the remote control to
select "RF.AGC".
Press the VOL. UP/DOWN button on the remote
control until the digital voltmeter is 2.40 ±0.15V.
1.
2.
3.
4.
5.
BEFORE MAKING ELECTRICAL
ADJUSTMENTS
2-2: CUT OFF
1.
2.
3.
4.
Adjust the unit to the following settings.
R.DRIVE=64, B.DRIVE=64, R.BIAS=127, G.BIAS=127,
B.BIAS=127, BRI.CENT=150, CON.MAX=100.
Place the set with Aging Test for more than 15 minutes.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (01) on the remote control to
select "CUT OFF".
Adjust the Screen Volume until a dim raster is obtained.
2-3: FOCUS
1.
2.
3.
Receive the monoscope pattern.
Turn the Focus Volume fully counterclockwise once.
Adjust the Focus Volume until picture is distinct.
2-4: WHITE BALANCE
NOTE: Adjust after performing CUT OFF adjustment.
Place the set with Aging Test for more than 10 minutes.
Receive the white 100% signal from the Pattern
Generator.
Using the adjustment control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (10) on the remote control to
select "R.BIAS".
Using the VOL. UP/DOWN button on the remote control,
adjust the R.BIAS.
Press the CH. UP/DOWN button on the remote control to
select the "R.DRIVE", "B.DRIVE", "G.BIAS" or "B.BIAS".
Using the VOL. UP/DOWN button on the remote control,
adjust the R.DRIVE, B.DRIVE, G.BIAS or B.BIAS.
Perform the above adjustments 6 and 7 until the white
color is looked like a white.
1.
2.
3.
4.
5.
6.
7.
8.
2-5: VIF VCO
Place the set with Aging Test for more than 15 minutes.
Receive an 80dB monoscope pattern.
Connect the digital voltmeter between the pin 5 of
CP601 and the GND.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (03) on the remote control to
select "V.VCO".
Press the VOL. UP/DOWN button on the remote
control until the digital voltmeter is 2.5V.
1.
2.
3.
4.
5.
D-1
•
•
•
•
Use an isolation transformer when performing any service
on this chassis.
Before removing the anode cap, discharge electricity
because it contains high voltage.
When removing a PCB or related component, after
unfastening or changing a wire, be sure to put the wire
back in its original position.
When you exchange IC and Transistor for a heat sink,
apply the silicon grease (YG6260M) on the contract
section of the heat sink. Before applying new silicon
grease, remove all the old silicon grease. (Old grease
may cause damages to the IC and Transistor.)
On-Screen Display Adjustment
In the condition of NO indication on the screen.
Press the VOL. DOWN button on the set and the
Channel button (9) on the remote control for more than
2 second to appear the adjustment mode on the screen
as shown in Fig. 1-1.
1.
Fig. 1-1
Use the Channel UP/DOWN button or Channel button
(0-9) on the remote control to select the options shown
in Fig. 1-2.
Press the MENU button on the remote control to end
the adjustments.
2.
3.
FUNCTION
OSD H
CUT OFF
RF AGC
VIF VCO
H.VCO
H.PHASE
V.SIZE
V.SHIFT
R.DRIVE
B.DRIVE
R.BIAS
G.BIAS
B.BIAS
BRIGHT CENT
BRIGHT MAX
BRIGHT MIN
NO.
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15 Fig. 1-2
FUNCTION
CONTRAST CENT
CONTRAST MAX
CONTRAST MIN
COLOR CENT
COLOR MAX
COLOR MIN
TINT
SHARPNESS
FM LEVEL
LEVEL
SEPARATION 1
SEPARATION 2
TEST MONO
TEST STEREO
NO.
16
17
18
19
20
21
22
23
24
25
26
27
28
29
TV
00 OSD 15
1. Oscilloscope
2. Digital Voltmeter
3. Pattern Generator
Prepare the following measurement tools for electrical
adjustments.
ELECTRICAL ADJUSTMENTS
2-6: SUB TINT/SUB COLOR
1.
2.
3.
4.
5.
6.
7.
8.
9.
Receive the color bar pattern.
Connect the oscilloscope to TP024.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (22) on the remote control to
select "TINT".
Press the VOL. UP/DOWN button on the remote control
until the section "A" becomes as straight line.
(Refer to Fig. 2-1)
Connect the oscilloscope to TP022.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (19) on the remote control to
select "COL.CENT".
Press the VOL. UP/DOWN button on the remote control
until the red color level is adjusted to 110 ±10% of the
white level. (Refer to Fig. 2-2)
Receive the color bar pattern. (Audio Video Input)
Press the TV/AV button on the remote control to set to
the AV mode. Then perform the above adjustments 2~7.
Fig. 2-1
White 100% Red 110% Fig. 2-2
2-7: HORIZONTAL PHASE
1.
2.
3.
4.
Receive the monoscope pattern.
Using the adjustment control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (05) on the remote control to
select "H.PHAS".
Press the VOL. UP/DOWN button on the remote
control until the SHIFT quantity of the OVER SCAN
on right and left becomes minimum.
1.
2.
3.
4.
5.
2-8: VERTICAL SHIFT, VERTICAL LINEARITY
Receive the monoscope pattern.
Using the remote control, set the brightness and contrast
to normal position.
Check if the step No. V. SHIFT is "0"
Adjust the VR401 until the horizontal line becomes fit
to the notch of the shadow mask.
Adjust the VR402 until the SHIFT quantity of the OVER
SCAN on upside and downside becomes minimum.
D-2
2-9: VERTICAL SIZE
1.
2.
3.
4.
5.
Receive the monoscope pattern.
Using the adjustment control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (06) on the remote control to
select "V.SIZE".
Press the VOL. UP/DOWN button on the remote control
until the SHIFT quantity of the OVER SCAN on upside
and downside becomes 9 ±2%.
Receive a broadcast and check if the picture is normal.
NOTE: Adjust after performing adjustments in section 2-8.
2-10: OSD HORIZONTAL
1.
2. Activate the adjustment mode display of Fig. 1-1.
Press the VOL. UP/DOWN button on the remote
control until the difference of A and B becomes
minimum. (Refer to Fig. 2-3)
B
A
TV
00 OSD 15
Fig. 2-3
Receive an 70dB monoscope pattern.
Using the adjustment control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (13) on the remote control to
select "BRI.CENT".
Press the VOL. UP/DOWN button on the remote control
until the screen begin to shine.
Press the TV/AV button on the remote to set to the
AV mode. Then perform the above adjustment 1~4.
1.
2.
3.
4.
5.
2-11: SUB BRIGHTNESS
2-12: PALABOLA CORR
1.
2. Receive the chosshatch pattern.
Adjust the VR403, so that the 3rd length line becomes
straight from the outside of the right and left.
"A"
ELECTRICAL ADJUSTMENTS
2-16: LEVEL
1.
2.
3.
4.
Receive a 70dB monoscope pattern.
Connect the AC voltmeter to the pin 6 of CP601 and
the GND.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (25) on the remote control to
select "LEVEL".
Press the VOL. UP/DOWN button on the remote
control until the AC voltmeter is 75 ±2mV.
2-13: CONSTANT VOLTAGE
1.
2.
3.
4.
5.
Place the set with Aging Test for more than 15 minutes.
Connect the digital voltmeter to the TP401.
Set condition is AV MODE without signal.
Using the remote control, set the brightness and contrast to
normal position.
Adjust the VR502 until the digital voltmeter is 135 ±1V.
2-14: SEPARATION 1, 2
1.
2.
3.
4.
5.
Set the multi-sound signal generator for each different L-ch
and R-ch frequency (Ex. L-ch=2KHz, R-ch=400Hz) and
receive the RF.
Connect the oscilloscope to the pin 6 and pin 7 of CP601.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (26) on the remote control to
select "SEP 1".
Press the VOL. UP/DOWN button on the remote control to
adjust it until the audio output wave becomes a fine sine
wave.
Press the CH UP button once the set to "SEP 2" mode.
Then perform the above adjustment 4.
Method (1)
1.
2.
3.
4.
5.
6.
7.
8.
9.
Set the multi-sound signal generator L-ch=1KHz, R-ch
=Non input and receive the RF.
Connect the oscilloscope to the pin 6 and pin 7 of CP601
Press the AUDIO SELECT button on the remote control to
set to the stereo mode.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (26) on the remote control to
select "SEP 1".
Press the VOL. UP/DOWN button on the remote control to
adjust it until the R-ch output becomes minimum.
Set the multi-sound signal generator L-ch=Non input,
R-ch=1KHz and receive the RF.
Connect the oscilloscope to the pin 6 and pin 7 of CP601
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (27) on the remote control to
select "SEP 2".
Press the VOL. UP/DOWN button on the remote control to
adjust it until the L-ch output becomes minimum.
Method (2)
Please do the method (1) or method (2) adjustment.
D-3
2-17: CONTRAST MAX
1.
2.
3.
4.
5.
6.
7.
Receive the color bar pattern. (RF Input)
Using the remote control, set the brightness and contrast
to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (17) on the remote control to
select "CONT MAX".
Press the VOL. UP/DOWN button on the remote
control until the contrast step No. becomes "100".
Receive a broadcast and check if the picture is normal.
Receive the color bar pattern. (Audio Video Input)
Press the TV/VIDEO button on the remote control to set
to the AV mode. Then perform the above adjustments
2~5.
Please check if the fixed values of the each adjustment
items are set correctly referring below.
2-18: Confirmation of Fixed Value (step No.)
NO.
04
07
14
15
16
18
20
21
23
24
28
29
FUNCTION
H VCO
V SHIFT
BRIGHT MAX
BRIGHT MIN
CONT CENT
CONT MIN
COLOR MAX
COLOR MIN
SHARPNESS
FM LEVEL
TEST MONO
TEST STERIO
RF
04
00
140
64
50
25
55
05
34
74
00
00
AV
---
---
140
64
50
25
55
05
34
---
---
---
2-15: HORIZONTAL SIZE
1.
2.
3.
Receive the monoscope pattern.
Using the remote control, set the brightness and contrast
to normal position.
Adjust the VR404 until the SHIFT quantity of the OVER
SCAN on the right and left becomes 10%
D-4
ELECTRICAL ADJUSTMENTS
3.
1.
2.
3.
1.
2.
3.
4.
5.
6.
7.
8.
3-2: PURITY
NOTE
Adjust after performing adjustments in section 3-1.
1.
2.
3.
4.
5.
Receive the green raster pattern from color bar
generator.
Adjust the pair of purity magnets to center the
color on the screen.
Adjust the pair of purity magnets so the color at the
ends are equally wide.
Move the deflection yoke backward (to neck side)
slowly, and stop it at the position when the whole
screen is green.
Confirm red and blue colors.
Adjust the slant of the deflection yoke while watching the
screen, then tighten the fixing screw.
DEFLECTION YOKE
DEFLECTION YOKE SCREW
MAGNET SCREW
PURITY MAGNETS
6 POLE MAGNETS
4 POLE MAGNETS
Fig. 3-1
PURITY AND CONVERGENCE
ADJUSTMENTS
NOTE
3-1: STATIC CONVERGENCE (ROUGH ADJUSTMENT)
Tighten the screw for the magnet. Refer to the adjusted
CRT for the position. (Refer to Fig. 3-1)
If the deflection yoke and magnet are in one body,
untighten the screw for the body.
Receive the green raster pattern from the color bar
generator.
Slide the deflection yoke until it touches the funnel
side of the CRT.
Adjust center of screen to green, with red and blue on the
sides, using the pair of purity magnets.
Switch the color bar generator from the green raster
pattern to the crosshatch pattern.
Combine red and blue of the 3 color crosshatch pattern
on the center of the screen by adjusting the pair of
4 pole magnets.
Combine red/blue (magenta) and green by adjusting the
pair of 6 pole magnets.
Adjust the crosshatch pattern to change to white
by repeating steps 6 and 7.
Turn the unit on and let it warm up for at least 30
minutes before performing the following adjustments.
Place the CRT surface facing east or west to reduce the
terrestrial magnetism.
Turn ON the unit and demagnetize with a Degauss Coil.
3-3: STATIC CONVERGENCE
1.
2.
3.
3-4: DYNAMIC CONVERGENCE
Adjust after performing adjustments in section 3-3.
1.
2.
Adjust the differences around the screen by moving
the deflection yoke upward/downward and right/left.
(Refer to Fig. 3-2-a)
Insert three wedges between the deflection yoke
and
CRT funnel to fix the deflection yoke.
(Refer to Fig. 3-2-b)
R G B
R
G
B
Fig. 3-2-a
WEDGE WEDGE
WEDGE
WEDGE POSITION
Fig. 3-2-b
R G B
R
G
B
Receive the crosshatch pattern from the color bar
generator.
Combine red and blue of the 3 color crosshatch pattern
on the center of the screen by adjusting the pair of
4 pole magnets.
Combine red/blue (magenta) and green by adjusting the
pair of 6 pole magnets.
UPWARD/DOWNWARD SLANT RIGHT/LEFT SLANT
Adjust after performing adjustments in section 3-2.
NOTE
NOTE
D-5
ELECTRICAL ADJUSTMENTS
4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION)
CRT PCB
R803
R805
J801
CP802B CP803B
TP022
TP024
CP801
CP806
MAIN PCB
CP802A
CP1001
CP502
VR401
VR402
S501A
FB401
T501
CP803A
VR404
VR403
J707 J701 J705
TU001
CP601
S501B
AC IN
TP001
CP401
CRT
SPEAKER
L503
CRT
VR502
TP401
D451
CD803
CD802
J702
J703
J704
STEREO PCB
CD701
CP701
CD801
CP805
CD805
REMOCON
21
22
23
15
14
32
59
64
63
CF601
SAW FILTER
CHROMA IC
IC601 M61250FP
PUMP UP
AMP
+
-
52
3
V-OUT IC
IC401
LA78041
Q801, Q804
RED OUT
Q803, Q805
GREEN OUT
Q802, Q806
BLUE OUT
CRT
V801
11 6 8
RGB
Heater F7
34
RED R 35
GREEN G
36
BLUE B
26CVIN
MICON IC
IC101 OEC7072A
X-RAY
TEST SW.
Q403
11
AUDIO MUTE
10
X-RAY_TEST
9
OS101
1
X-RAY TEST
SW
Q404
FSC IN
42
6
E-1 E-2
POWER
VOL UP
KEY1
6
CH UP
VOL DOWN
CH DOWN
KEY2
7
SOUND DECORDER IC
IC901 AN5829S
18 19
AC IN
F501
8
5
T501
VR502
+B ADJ.
L503
DEGAUSS COIL
RY501
RELAY
Q504
RELAY DRIVE
23
22 21 24 2
3
2
REAR_AV_OUT
(STEREO)
J707
3
VIDEO AMP IC
IC702
NJM2245L
531
Q901
BUFFER
MEMORY IC
IC199
S-24C08ADPA-01
SCL 1
30
SDA 1
31
4
BLOCK DIAGRAM
2
14
7
1VCC
Q402
H. DRIVE
Q401
H. OUTPUT
6
5
SCL
SDA
BUFFER
Q902
7
X-RAY
POWER
29
8
13 AV1
12 AV2
2EXT MUTE
51 AUDIO OUT
VIF IN(1)
G IN
B IN
R IN
RF AGC OUT
POWER ON CONT
H OUT
VREG Vcc
VIF IN(2)
20
SCL
26 SDA
27
10
V PULSE OUT
5V OUT
28
FPB IN
14
DEGAUSS_H
13
15
STEREO+5V
REG
Q605
REG
Q608
REG
Q604
X602
3.579545MHz
31
11
49
8.7V REG OUT
P.CON 5.7V REG
AT5.7V REG OUT
Y SW OUT
R OUT
G OUT
47
28
RECTIFIER
16
B OUT
Q606
REG
REG
Q603
AT+5V
346
5 2
REAR_AV-IN
(STEREO)
J701
FEED BACK
SW.
Q507
BUFFER
Q502
SWITCHING
Q501 FB401
10
HV
F
S
FBT
9
1
3
24
IC501
LTV-817M-VB
FEED BACK
IC402
KIA78L09BP-AT
9V REG IC
TUNER+5V
P.CON + 9V
910 14
TONE CONTROL IC
IC302 M62420FP
7
219
AV/S SW IC
IC1502 NJM2283M
12 6 7
358911 16
12 14
Q701
BUFFER
Q702
BUFFER
VIDEO
J702
41
TV/Y IN
38
EXT C in
44
HI VCC
34
X' TAL
SPEAKER
SP1001
IC1001 AN5276
SOUND
AMP IC 9
12
7
5
8
2
Q706
BUFFER S_VIDEO
J705
6
3
4
MUTE
Q707
MUTE
Q705
AGC
IF
TU001
1
38
H. SYNC
37
V. SYNC
58
VIF VIDEO OUT
1
DY
11 45
SCL SDA
TH501
D501~D504
2
AUDIO_R
J704
2
3
2
AUDIO_L
J703
29 FSC OUT 1
10 15
COMB FILTER IC
IC1501 TC90A45F
413
SPEAKER
SP1002
C652
R626
CF601
R630
R631
R627
D616
D615
D613
R610
C603
R614
D611
D612
D610
C612
Q603
C625
C604
L606
C605
C610 C601
C634
X602
R608
R638
L608
W089
C647
C613
C635
CF604
L607
Q607
R617
C632
R404
R607
C646
Q609
R613
C639_1
C626
W020
CP802A L601
R637
C911
C915
C916
C904
C905
C907
C910
C903
Q902
Q901
R312
R308
C317 C328_1
W078
W076
CP1001
W863
W864
W011
W012
W007
W009
W048
C124_1
IC199
C122
W801
L101
W845
R114
C115
C120
R111
R107
C128
SW105
W169
SW102 SW101 SW104 SW103
W122
R140
D104
C123
R131
W121
W120
W054
C119
W066
W128
W053
W067
W068
W127
W130
W056
W070
C137
C129
C125
W117
W133
W134
W131
W051
C1513
L1501
C1504
L1502
W803
C1512
Q1507
W125
L1506
L1504
Q1502
L1503
C1514
W129
W139
D405
R422
R417_1
R407
R446
C455
W144
R421_1
R450
VR502
Q507
B504
C521
R410
R434
IC401
FH502
F501
FH501
CP502
D504
D502
C420
C448
R424
R402
D503
D501
W162
C507
Q403
Q404
C427_1 R433
R412
R435
R436
HS501
C412
C511_1
R542
D528
C453_2
R535
D404
R416
R418
R500
R515
D411
W167
R439
R503
W850
R427
Q502
Q504
D407
D509
IC501 Q401
VR401
VR402
D410
Q501
Q805Q806
Q804
Q801 Q802 Q803
D802
D803
D801
CP806
W151
D408
W841
R806
CP801
CP805
RY501
D521
R803
R805
R807
J801
C506_1
R520
R511
W821
W867
C502
C503
S501A
C403_1
R501
R514
CP401
T501
D512
D525
R547
R554
R555
R536
D518
W849
R512
CP803A
CP802B
CP803B
D452
C449
D451
C451
R461
HS402
W160
W156
R415
W163
C434
R409
W146
VR404
VR403
R441
R438
Q408
R455
W165
W166
R456
R458
D415
R457
R454
R447_1
R445
C441
W164
R430
R141
R142
W104
R902
W095
C445
Q407
C430_1
R406
C437
R444
R420
R440
R460
R431
R443
W844
W161
W159
W158
C730
C729
C704
C703
C705
C728 C726 R720
R721
Q705
Q707
J707 J701
J705
D001
W106
W111
W029
TU001
W023
R623
R606
R760
W040
R645
C719
R749
D705
W025
Q706 R632
R629_1
Q608
Q606
W026
C628
Q604
Q605
C624
D601
D602
W027
IC702
HS1001
C1011
R1009
R1004
C1003 C1001
W031
D605
W114
C1008
W024
R621
W034
C1014
C003
C002
TP001
W107
W108
W109
C721
C706
C717
W093
W099
C707
W030
W037
W041
W112
W105
W110
W088
W137
W082
C1505
D1502
W092
C1527
R1520
W090
W049 Q1508
D1501
W050
C620
C645
W039
W102
W152
W171
R1003
W044
C630 C1009
R504
R1008
R702
C435_1
W075
R901
W010
W047
W036
W032
C732
C501
C527
C118 C446
W035
C1013
W172
D510
C504
C648
W154
W136
R804
W168
W147
R802
L401_1
OS101
R106
R105
C104
W074
C007
C303
C918
C917 C912
C914
C327
C301
C727
C316
C323
C401
C402
W142
W143
C436
C440_2
C452_1
C509_2
C516
C802
D414
D505
Q409
Q701
Q702
T401
D417
Q402_1
C442
C322
Q405
R904
D508
R507
D506
D523
L501
C518
C505_1
C444_1
R408
R459
IC402
C515
W079
W113
W043
W085
W124
HS401
W091
W021
L603
L602
W017
W019
W064
W065
W063
D507
C513_1
R513
W086
W084
W132
D511
Q101
D101
R138
W115
W077
R137
C325
W018
C607_1
W002
D102
C621
W004
W001
R405
W003
TP022
TP023
TP024
C512_1
C520
C447
L901_1
Q406
R517_1
B501
W823
D516
W042
C720
W175
W073
L403
W174
W176
R429
W813
W185
R641
C1501
W140
R543_1
W045
W180
C418
W822
W835
C331
C722
C631
W150
D607
W096
C901
C902
W052
W181
R113
Q103
R516
S501B
FB401_2
W182
D514
D517
C433
C1007
W080
W081
D412
C439
L801
C414
C417
W083
W100
W101
W097
W098
W153
D513
C644
C517
Q102
W183
IC1001
C514_1
W184
R508
D515
C528
C508
W816
C619
Q1505
Q1501
S801Y
W186
S801X
W103
D406
C454
ICP501
L605
C638
TH501_1
CF603
CP601_2
R1526
C805
W857
W852
L701
W177
W860
CP701
S808Y S802Y
S802X
CF602
C1532_1
C406
R521
W856
R644
W149
W851
C629_1
CD501
W187
W005
W006
W825
C731
S808X
S803X
S803Y
S804X
S804Y
W072
W071
CD802A
CD802B
CD803A
CD803B
R423
R426
PRINTED CIRCUIT BOARDS
F-1 F-2
CD701
J704
J703
J702
C709
C710
R705
R706
C713
C711
R701
C712
MAIN/CRT (INSERTED PARTS)
SOLDER SIDE STEREO
SOLDER SIDE
_A_V
6.3A125VOR250V
17
33
49
1
R636
R605
R619
R625
R642R646
C616
R633
R628
C655
C623_1
R609
C618
C636
R601
R602
C622
R650
C650
R639
IC601
C913
C908
R903
IC901
R306
C324
R307
C332
R310
C315
R309
IC302
R311
R118
R109
C108
C107
R108
C103
R127
C113 C121
C114
R134
R129
C609
R119
R104
R121
IC101
R122
R103 R120
R124
R123
C140
R101
R128
R126
R112
R115
R635
R130
IC1501
C1506
C1510
C1508
R1503
C1507
C1509
C1511
R1505
R1501
C1502_1
R1527
C1515
IC1502
C1526
C1517
R1504
C1518
R1506
C1516
R1517
C1519
C1523
R1508
R532 R533
R437
R534
R814
R816
R811
R815
R809
R813
C810
C809
C811
R808
R801
R810
C801
R817
R818
R819
C408
R722
R725
R726
R728
R723
R711
R709
R703
R704
R729
R727
R731
R710
C708
R622
R615
C602 R611
R004
C1004
R1014
R1015
C1002
R719
R1523
R1521
R1519
R1518
R110
R1002
R1006
R708
R505
R125
R133
R1511
R139
R102
R136
R643
C614
C1520
R143
R403
C110
C106
C109
R1512
R1515
R1514
R620
R117 C1521
R724
R707
R909
R905
R908
R145
R144
R146
R518
C1525
C1530
C117
C806
W829
C606
W859
C642
C1531
W865
W866
C919_1
R907
W855
C1524_1
PRINTED CIRCUIT BOARDS
MAIN/CRT (CHIP MOUNTED PARTS)
SOLDER SIDE
F-3 F-4
Other manuals for MT2327
1
Table of contents
Other Memorex TV Receiver manuals
