Sharp 27K-X2000 User manual

1
27K-X2000
COLOR TELEVISION
Chassis No.SN-84
In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its
original condition and only parts identical to those specified should be used.
S68S727K-X200
»ELECTRICAL SPECIFICATIONS......................................................................................................... 1
»IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................2
»LOCATION OF USER'S CONTROL.....................................................................................................4
»INSTALLATION AND SERVICE INSTRUCTIONS ...............................................................................5
»CHASSIS LAYOUT ............................................................................................................................ 13
»BLOCK DIAGRAM ............................................................................................................................. 15
»SCHEMATIC DIAGRAMS .................................................................................................................. 17
»PRINTED WIRING BOARD ASSEMBLIES ........................................................................................27
»REPLACEMENT PARTS LIST ........................................................................................................... 36
»PACKING OF THE SET ..................................................................................................................... 49
Page
POWER INPUT ................................................... 120 V AC 60 Hz
POWER RATING ..................................................................135 W
PICTURE SIZE ........................................... 2,187cm2(339sq inch)
CONVERGENCE............................................................. Magnetic
SWEEP DEFLECTION .....................................................Magnetic
FOCUS ............................................... Hi-Bi-Potential Electrostatic
INTERMEDIATE FREQUENCIES
Picture IF Carrier Frequency ..................................... 45.75 MHz
Sound IF Carrier Frequency ...................................... 41.25 MHz
Color Sub-Carrier Frequency..................................... 42.17 MHz
(Nominal)
AUDIO POWER
OUTPUT RATING.............. 1.3W + 1.3W (at 10% distortion and
Dual CH Operate)
SHARP CORPORATION This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
CONTENTS
ELECTRICAL SPECIFICATIONS
SPEAKER
SIZE ...................................................................... 8 cm (Round)
VOICE COIL IMPEDANCE...............................8 ohm at 400 Hz
ANTENNA INPUT IMPEDANCE
VHF/UHF ....................................................75 ohm Unbalanced
TUNING RANGES
VHF-Channels .............................................................. 2 thru 13
UHF-Channels ............................................................ 14 thru 69
CATV Channels .......................................................... 1 thru 125
(EIA, Channel Plan U.S.A.)
SERVICE MANUAL
27K-X2000
MODEL
Specifications are subject to change without
prior notice.

2
27K-X2000
IMPORTANT SERVICE SAFETY PRECAUTION
Serviceworkshouldbe performed only byqualifiedservicetechnicianswho are thoroughly
familiar with all safety checks and the servicing guidelines which follow:
4A 125V
SERVICING OF HIGH VOLTAGE SYSTEM
AND PICTURE TUBE
When servicing the high voltage system,
remove the static charge by connecting a
10k ohm resistor in series with an insulated
wire (such as a test probe) between the pic-
ture tube ground and the anode lead. (AC
line cord should be disconnected from AC
outlet.)
1. Picture tube in this receiver employs integral
implosion protection.
2. Replace with tube of the same type number for
continued safety.
3. Do not lift picture tube by the neck.
4. Handle the picture tube only when wearing
shatterproof goggles and after discharging the high
voltage anode completely.
X-RADIATION AND HIGH VOLTAGE LIMITS
1. Be sure all service personnel are aware of the
proceduresand instructions covering X-radiation.The
only potential source of X-ray in current solid state
TVreceivers is the picture tube.However, thepicture
tube does not emit measurable X-Ray radiation, if
the high voltage is as specified in the "High Voltage
Check" instructions.
It is only when high voltage is excessive that X-
radiation is capable of penetrating the shell of the
picture tube including the lead in the glass material.
The important precaution is to keep the high voltage
below the maximum level specified.
2. It is essential that servicemen have available at all
times an accurate high voltage meter.
The calibration of this meter should be checked
periodically.
3. Highvoltage should always be kept at the ratedvalue
−no higher. Operation at higher voltages may cause
a failure of the picture tube or high voltage circuitry
and;also, under certain conditions, may produce
radiation in exceeding of desirable levels.
4. Whenthe high voltage regulator is operating properly
thereisno possibility of an X-radiationproblem.Every
time a colour chassis is serviced, the brightness
should be tested while monitoring the high voltage
with a meter to be certain that the high voltage does
notexceedthespecifiedvalueandthatitisregulating
correctly.
5. Do not use a picture tube other than that specified or
make unrecommended circuit modifications to the
high voltage circuitry.
6. Whentroubleshootingandtakingtestmeasurements
onareceiver with excessive high voltage, avoid being
unnecessarily close to the receiver.
Do not operate the receiver longer than is necessary
to locate the cause of excessive voltage.
WARNING
1. For continued safety, no modification of any circuit
should be attempted.
2. Disconnect AC power before servicing.
3. Semiconductor heat sinks are potential shock
hazards when the chassis is operating.
4. The chassis in this receiver has two ground systems
whichare separated by insulating material.The non-
isolated (hot) ground system is for the B+ voltage
regulatorcircuitand the horizontal outputcircuit. The
isolatedgroundsystemisforthelowB+ DCvoltages
and the secondary circuit of the high voltage
transformer.
To prevent electrical shock use an isolation
transformer between the line cord and power
receptacle, when servicing this chassis.
CAUTION: FOR CONTINUED
PROTECTION AGAINST A
RISK OF FIRE, REPLACE
ONLY WITH SAME TYPE 4A-
125V FUSE.

3
27K-X2000
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SAFETY NOTICE
Many electrical and mechanical parts in television
receivers have special safety-related characteristics.
These characteristics are often not evident from visual
inspection, nor can protection afforded by them be
necessarilyincreased by using replacement components
rated for higher voltage, wattage, etc.
Replacement parts which have these special safety
characteristics are identified in this manual; electrical
components having such features are identified by "å"
and shaded areas in the Replacement Parts Lists and
Schematic Diagrams.
IMPORTANT SERVICE SAFETY PRECAUTION
(Continued)
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. Inspect all protective devices such as non-metallic
control knobs, insulating materials, cabinet backs,
adjustment and compartment covers or shields,
isolation resistor-capacity networks, mechanical
insulators, etc.
3. To be sure that no shock hazard exists, check for
leakage current in the following manner.
»Plug the AC cord directly into a 120 volt AC outlet,
(Do not use an isolation transformer for this test).
»Using two clip leads, connect a 1.5k ohm, 10 watt
resistorparalleledby a 0.15µFcapacitor inserieswith
all exposed metal cabinet parts and a known earth
ground,suchaselectricalconduitorelectricalground
connected to earth ground.
»Use anAC voltmeter having with 5000 ohm per volt,
or higher, sensitivity to measure theAC voltage drop
across the resistor. 1.5k ohm
10W
0.15µF
TEST PROBE
TO EXPOSED
METAL PARTS CONNECT TO
KNOWN EARTH
GROUND
For continued protection, replacement parts must be
identical to those used in the original circuit. The use of
substitutereplacementparts which do not have thesame
safety characteristics as the factory recommended
replacement parts shown in this service manual, may
create shock, fire, X-radiation or other hazards.
BEFORE RETURNING THE RECEIVER
(Fire & Shock Hazard)
Before returning the receiver to the user, perform
the following safety checks.
»Connect the resistor connection to all exposed metal
parts having a return to the chassis (antenna, metal
cabinet, screw heads, knobs and control shafts,
escutcheon, etc.) and measure the AC voltage drop
across the resistor.
AII checks must be repeated with the AC ine cord
plug connection reversed. (If necessary, a non-
polarized adapter plug must be used only for the
purpose of completing these check.)
Anycurrent measured must not exceed0.5milliamp.
Any measurements not within the limits outlined
above indicate of a potential shock hazard and
corrective action must be taken before returning the
instrument to the customer.

4
27K-X2000
LOCATION OF USER'S CONTROL

5
27K-X2000
CIRCUIT PROTECTION
The receiver is protected by a 4.0A fuse
(F701), mounted on PWB-A, wired into one
side of the AC line input.
X-RADIATION PROTECTOR CIRCUIT TEST
After service has been performed on the horizontal
deflection system, high voltage system, B+ system,
test the X-Radiation protection circuit to ascertain
proper operation as follows:
1) Apply 120V AC using a variac transformer for
accurate input voltage.
2) Allow for warm up and adjust all customer controls
for normal picture and sound.
3) Receive a good local channel.
4) Connect a digital voltmeter to TP653 and make sure
that the voltmeter reads 8.9V ±0.5V.
5) Apply external 10.9V DC at TP653 by using an
external DC supply, TV must be shut off.
6) Toresettheprotector,unplugtheACcord. Nowmake
sure that normal picture appears on the screen.
7) If the operation of the horizontal oscillator does not
stop in step 5, the circuit must be repaired before the
set is returned to the customer.
HIGH VOLTAGE CHECK
High voltage is not adjustable but must be checked
to verify that the receiver is operating within safe
and efficient design limitations as specified checks
should be as follows:
1. Connect an accurate high voltage meter between
ground and anode of picture tube.
2. Operate receiver for at least 15 minutes at 120V AC
linevoltage, with astrongairsignal or aproperlytuned
in test signal.
3. Enter the service mode and select the service
adjustment "S21" and Bus data "01" (Y-mute on).
4. Thevoltageshouldbe approximately,28.1kV(atzero
beam).
Ifa correct readingcannotbeobtained,check circuitry
formalfunctioningcomponents. After the voltage test,
make Y-mute off to the normal mode.
INSTALLATION AND SERVICE INSTRUCTIONS
Note: (1)When performing any adjustments to resistor controls and transformers use non-metallic
screwdrivers or TV alignment tools.
(2)Before performing adjustments, the TV set must be on at least 15 minutes.

6
27K-X2000
Figure A.
For adjustments of this model, the bus data is converted to various analog signals by the D/A converter
circuit.
Note: There are still a few analog adjustments in this series such as focus and master screen voltage.
Follow the steps below whenever the service adjustment is required. See "Table-B" to determine, if serv-
ice adjustments are required.
1. Service mode
Before putting unit into the service mode, check that
customer adjustments are in the normal mode. Use
the reset function in the video adjustment menu to
ensure customer controls are in their proper (reset)
position.
2. Service number selection
Once in the service mode, press the Ch-up or Ch-
down button on the remote controller or at the set.
The service adjustment number will vary in
increments of one, from "S01" to "A05". Select the
item you wish to adjust.
3. Data number selection
Press the Vol-up or down button to adjust the data
number.
To enter the service mode and exit serv-
ice mode.
While pressing the Vol-up and Ch-up buttons at the
sametime, plug the AC cord into a wall socket.
Now the TV set is switched on and enters the service
mode.
To exit the service mode, turn the television off by
pressing the power button.
S01 D:00
SERVICE ADJUSTMENT NUMBER
DATA NUMBER CHANNEL
(INPUT)
2
ANT-B
S01 081

7
27K-X2000
»To call up the service mode, hold down the CH UP and VOL UP keys of the unit at once and plug the AC power
cord into a wall outlet. The unit switches on and comes in the service mode.
»Now hold down both the CH UP and CH DOWN keys of the unit for 2 seconds or longer. The above default values
are written in the EEPROM.
SERVICE
No.
S01 PICTURE HEIGHT 0 ~ 127 71 RF signal input (TUNER-B) Deflection processor IC (IC502) adjusted
(or EXT. Video input)
S02 V-LINEARITY 0 ~ 31 27 ” ”
S03 V-∫CORRECTION 0 ~ 63 40 40 ” ”
S04 PICTURE WIDTH 0 ~ 63 50 45 ” ”
S05 E-W PARABOLA 0 ~ 63 15 32 ” ”
S06 E-W CORNER 0 ~ 31 13 16 ” ”
S07 TRAPEZIUM 0 ~ 127 65 64 ” ”
S08 AGC SW 0 ~ 1 1 1 ” ”
S09 PICTURE(SUB CONTRAST) 0 ~ 31 28 ” VCJ IC (IC401) adjusted
S10 TINT 0 ~ 63 20 ” ”
S11 COLOR(SUB COLOR) 0 ~ 31 13 ” ”
S12 BRIGHT (BRIGHTNESS) 0 ~ 101 58 ” ”
S13 SHARP(SHARPNESS) 0 ~ 27 5 0 ” ”
S14 V-POSITION 0 ~ 7 0 0 ” ”
S15 H-POSITION 0 ~ 31 17 ” ”
S16 R CUT-OFF 0 ~ 255 64 ” ”
S17 G CUT-OFF 0 ~ 255 64 ” ”
S18 B CUT-OFF 0 ~ 255 64 ” ”
S19 G(R) DRIVE 0 ~ 127 64 ” ”
S20 B DRIVE 0 ~ 127 64 ” ”
S21 Y-MUTE/V-OFF 0 ~ 2 0 ” 00: Normal, 01: Y-mute, 03: Horizontal Y-mute
S22 Y-γCURVE 0 ~ 3 0 3 ” VCJ IC (IC401) adjusted
S23 VSM PHASE 0 ~ 3 1 3 ” ”
S24 APACON PEAK f0 0 ~ 7 1 1 ” ”
S25 DC RESTORATION 0 ~ 63 21 21 ” ”
S26 DC RESTORATION LIMIT 0 ~ 3 0 3 ” ”
S27 BLACK STRETCH POINT 0 ~ 7 3 3 ” ”
S28 APL VS BPS 0 ~ 3 1 1 ” ”
S29 B.L.C. 0 ~ 1 1 1 ” ”
S30 DYNAMIC ABL POINT 0 ~ 7 4 0 ” ”
S31 DYNAMIC ABL GAIN 0 ~ 7 4 7 ” ”
S32 ABL POINT 0 ~ 7 3 3 ” ”
S33 ABL GAIN 0 ~ 7 3 2 ” ”
S34 Y-DL 0 ~ 1 1 0 ” ”
S35 TOF-f0 0 ~ 7 4 7 ” ”
S36 TOF-Q 0 ~ 7 4 4 ” ”
S37 VSM GAIN 0 ~ 3 1 3 ” ”
S38 OSD SL 0 ~ 1 0 1 ” ”
VARIABLE
DATA RANG INITIAL VALUE FIXED VALUE CONTROL DESTINATION
INPUT CONDITIONS
ADJUSTMENT ITEM

8
27K-X2000
SERVICE
No.
VARIABLE
DATA RANG INITIAL VALUE FIXED VALUE CONTROL DESTINATION
INPUT CONDITIONS
ADJUSTMENT ITEM
S39 C-DECODE 0 ~ 255 105 161 ” ”
S40 OSD POSITION 0 ~ 15 11 ” C.C. display positioning
M01 INPUT LEVEL (ATT) 0 ~ 15 7 ” MTS IC (IC3001) adjusted
M02 MTS VCO 0 ~ 63 37 ” ”
M03 FILTER 0 ~ 63 30 ” ”
M04 WIDE BAND 0 ~ 63 17 ” ”
M05 SPECTRAL 0 ~ 63 22 ” ”
M06 MTS DATA READ 0 ~ 1 0 Note 1 ” Factory-adjusted only
P01 PIP Y-LEVEL(CONTRAST) 0 ~ 127 43 ” P-IN-P adjusted
P02 PIP TINT (TINT) 0 ~ 63 41 37 ” ”
P03 PIP COLOR(COLOR_SAT) 0 ~ 127 55 RF signal input (TUNER-B) P-IN-P adjusted
P04 Y-OFFSET(Y_OFFSET) 0 ~ 31 9 09 ” ”
P05 PIP H-POSI(HXA) 0 ~ 255 9 10 ” ”
P06 BGP(HADJ) 0 ~ 15 0 00 ” ”
P07 FREE RUN(FREE_RUN_ADJ) 0 ~ 15 11 11 ” ”
C01 PICTURE-C(SUB CONTRAST) 0 ~ 31 28 14 Component signal input VCJ IC (IC401) adjusted
C02 TINT-C 0 ~ 63 20 14 ” ”
C03 COLOR-C(SUB COLOR) 0 ~ 63 13 3 ” ”
C04 BRIGHT-C(BRIGHTNESS) 0 ~ 101 58 ” ”
C05 SHARP-C(SHARPNESS) 0 ~ 27 5 0 ” ”
C06 V-POSITION-C 0 ~ 7 0 0 ” ”
C07 H-POSITION-C 0 ~ 31 19 ” ”
C08 R CUT-OFF-C 0 ~ 255 64 ” ”
C09 G CUT-OFF-C 0 ~ 255 64 ” ”
C10 B CUT-OFF-C 0 ~ 255 64 ” ”
C11 G(R) DRIVE-C 0 ~ 127 64 ” ”
C12 B DRIVE-C 0 ~ 127 64 ” ”
C13 VSM GAIN-C 0 ~ 3 2 3 ” ”
A01 PICTURE-2 0 ~ 31 28 RF signal input (TUNER-A) ”
A02 TINT-2 0 ~ 63 20 ” ”
A03 INPUT LEVEL-2 0 ~ 15 7 ” MTS IC (IC3001) adjusted
A04 WIDE BAND-2 0 ~ 63 17 ” ”
A05 SPECTRAL-2 0 ~ 63 22 ” ”
Note 1 : This item is used only at the manufacturing factory.
Do not change the data. (If this setting is changed to "1", the adjustment data may get wrong.)
Table - A

9
27K-X2000
NECESSARY UNNECESSARY
ADJUSTMENT NOTES
PART REPLACED
Holdingdownboth the CH-up/down buttonson theTV set at service modefor morethan2seconds will automatically
write the above initial values into IC2002.
The adjustment is needed to compensate for characteristics
of parts including IC401.
Data is stored in IC2002.
X
IC2001
Holding down both the CH-up/down bottons on the TV set in
the service mode for more than 2 seconds will automatically
write the above initial values into IC2002. Then perform a
complete adjustment.
Adjust items related to MTS only (M01~M05).
Adjust items related to picture tube only.
Adjust items related to P-IN-P only (P01~P07).
CRT
IC3001
IC1801
X
X
Table - B
IC2002 X
IC401 X
X

10
27K-X2000
SERVICE ADJUSTMENT
Entering The Fixed Values
1. Before starting all the adjustments, enter the fixed
values listed in Table - A.
Screen Adjustment
1. FeedtheB/Wpatternsignal from thesignalgenerator.
2. Connect the oscilloscope probe between TP854 and
GND.
3. Set the S21 bus data to "01" to get the Ysignal mute.
4. Adjust the S16(R), S17(G) and S18(B) settings to
Step "64".
5. Adjust the S12 (SUB-BRIGHT) setting to fix the
voltage between TP854 and GND at 2.15V.
6. Adjust the SCREEN control until the raster becomes
as dim as possible and just visible.
7. Selectaluminance-shortgun,andadjust the bus data
of S16(R), S17(G) or S18(B) to have the luminance
at the white level.
8. Adjust the SCREEN control again to cut off the CRT.
9. SettheS21busdatato"00"todeactivatetheYsignal
mute.
Sub-Picture Adjustment
1. Receive a good local channel signal through the
antenna B.
2. Make sure the customer picture control is set to
maximum.
3. Enter the service mode and select the service
adjustment "S09".
4. Adjust the data value to achieve normal contrast
range.
5. Receivethe same local channel throughtheantenna
A.
6. Adjustthe"A01" setting to achieve thesame contrast
as that with the antenna B.
Sub-Tint Adjustment
1. Receive a good local channel through the antenna
B.
2. Set customer tint control to center of it's range.
3. Enter the service mode and select the service
adjustment "S10".
4. Adjust "S10" data value to obtain normal flesh tones.
5. Receivethe same local channel throughtheantenna
A.
6. Adjust the "A02" setting to achieve the same tint as
that with the antenna B.
Sub-Color Adjustment
1. Receive a good local channel.
2. Makesure the customer color controlisset to center
position .
3. Entertheservicemodeandselectserviceadjustment
"S11".
4. Adjust "S11" data value to obtain normal color level.
2.15 ±0.15 V DC
GND
White Balance Adjustment
White balance adjustment of composite signal input
1. Feed the B/W pattern signal via the video input
terminal from the signal generator.
2. Adjust the "S19" and "S20" settings to obtain the
specified white level.
White balance adjustment of component signal input
1. FeedtheB/Wpatternsignalviathecomponentsignal
input Y terminal from the signal generator.
2. Set the S21 bus data to "01" to get the Ysignal mute.
3. Adjust the C08(R), C09(G) and C10(B) settings to
step "64".
4. Selectaluminance-shortgun,andadjust the bus data
of C08(R), C09(G) or C10(B) to have the luminance
at the white level.
5. Adjust the "C11" and "12" settings to obtain the
specified white level.

11
27K-X2000
Sub-Brightness Adjustment
1. Have unit receive a good local channel.
2. Make sure the customer brightness control is set to
center position.
3. Enter the service mode and select the service
adjustment "S12".
4. Adjust "S12" data value to obtain normal brightness
level.
5. Enter the same data value as the "S12" setting to
"C04".
Vertical Linearity Adjustment
1. Feed the circular or crosshatch pattern signal.
2. Enter the service mode and select the service
adjustment "S02".
3. While observing the top and bottom of the screen,
adjust "S02" data value to proper vertical linearity.
Vertical Size Adjustment
1. Feed the circular or crosshatch pattern signal.
2. Enter the service mode and select the service
adjustment "S01".
3. While observing the top and bottom of the screen,
adjust "S01" data value to proper vertical size.
Vertical Phase Adjustment
1. Enter the service mode and select the service
adjustment "S14".
2. Adjust data value to "00".
Note: Thismustbe set "00" when changeddata retrace
line will appear.
Figure B.
Horizontal Position Adjustment
1. Have unit receive a good local channel.
2. Enter the service mode and select the service
adjustment "S15".
3. Adjust "S15" data value so that picture is centered.
4. Enter the "S15" setting plus 2 steps to "C07".
Caption Position Adjustment (Horizontal)
1. Have unit receive a good local channel.
2. Enter the service mode and select the service
adjustment "S40".
3. A black text box appears on the screen. (see Figure
B below)
4. Adjust "S40" data value so that text box is positioned
in the center of the screen.

12
27K-X2000
P-IN-P ADJUSTMENTMTS ADJUSTMENT
MTS Level Adjustment
1. Feed the following monaural signal to pin (14) of
IC3001.
Monaural signal : 300Hz, 245mVrms
2. Connect the rms voltmeter to pin (39) of IC3001.
3. Enter the service mode and select the service
adjustment "M01".
4. Adjust the data so that the rms voltmeter reads.
Spec.: 490 ±10mVrms.
MTS VCO Adjustment
1. Keep the unit in no-signal state.
2. Connectthe frequency countertopin (39) of IC3001.
3. Connect a capacitor (100µF, 50V) in between
positive(+) side of C3005 and ground.
4. Enter the service mode and select the service
adjustment "M02"
5. Adjust the data so that the frequency counter reads.
Spec.: 62.94 ±0.75kHz.
Filter Adjustment
1. Feed the following stereo pilot signal to pin (14) of
IC3001 .
Stereo pilot signal: 9.4kHz, 600mVrms.
2. Enter the service mode and select the service
adjustment "M03".
3. Adjust the data at the point where "OK" appears on
the screen. The "OK" represents the approximate
center of the adjustable range of the data.
Separation Adjustment
1. Connect the rms voltmeter to pin (39) of IC3001.
2. Receive the following composite stereo signal 1.
Composite stereo signal: 30% modulation, left
channel only, noise reduction on, 300Hz
3. Enter the service mode and select the service
adjustment "M04".
4. Adjust the data until the AC voltage reading of the
rms voltmeter is minimum.
5. Receive the following composite stereo signal 2.
Stereo signal: 30% modulation, left channel only,
noise reduction on, 3kHz
6. Enter the service mode and select the service
adjustment "M05".
7. Adjust the data until the AC voltage reading of the
rms voltmeter is minimum.
8. Take the above steps 1 thru 8 again for fine
adjustment.
P-IN-P Y LEVEL Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service
adjustment "P01".
3. Adjust "P01" data value to obtain normal contrast
level.
P-IN-P TINT Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service
adjustment "P02".
3. Adjust data value to "37".
P-IN-P COLOR Adjustment
1. Receive a good local channel.
2. Make sure the customer color control is set to center
position.
3. Entertheservicemodeandselectserviceadjustment
"P03".
4. Adjust "P03" data value to obtain normal color level.
P-IN-P Y-OFF SET Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service
adjustment "P04".
3. Adjust data value to "09".
P-IN-P H-POSITION Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service
adjustment "P05".
3. Adjust data value to "10".
P-IN-P BURST GATE PULSE (for MAIN)
1. Receive a good local channel.
2. Enter the service mode and select the service
adjustment "P06".
3. Adjust data value to "00".
P-IN-P FREE RUN
1. Recieve a good local channel.
2. Entertheservicemodeandselectserviceadjustment
"P07".
3. Adjust data value to "11".

27K-X2000 27K-X2000
121110987654321
A
B
C
D
E
F
G
H
CHASSIS LAYOUT PWB-B
PWB-H
PWB-K
PWB-L
PWB-R
PWB-A
13 14

27K-X2000 27K-X2000
121110987654321
A
B
C
D
E
F
G
H
BLOCK DIAGRAM
15 16

27K-X2000 27K-X2000
121110987654321
A
B
C
D
E
F
G
H
17 18
DESCRIPTION OF SCHEMATIC DIAGRAM
NOTES:
1. The unit of resistance "ohm" is omitted.
(K=k Ω =1000 Ω , M=M Ω )
2. All resistors are 1/8 watt, unless otherwise noted.
3. All capacitors are µ F, unless otherwise noted.
(P=pF=µµF)
4. (G) indicates ±2% tolerance may be used.
5. indicates line isolated ground.
6. indicates hot ground.
VOLTAGE MEASUREMENT CONDITIONS:
1. All DC voltages are measured with DVM connected
between points indicated and chassis ground, line
voltagesetat120VAC andall controls set for normal
picture unless otherwise indicated.
2. All voltages measured with 1000µ V B & W or Color
signal.
WAVEFORM MEASUREMENT CONDITIONS:
1. Photographs taken on a standard gated color bar
signal, the tint setting adjusted for proper color. The
wave shapes at the red, green and blue cathodes of
the picture tube depend on the tint, color level and
picture control.
2. indicates waveform check points (See chart,
waveforms are measured from point indicated to
chassis ground.)
å AND SHADED ( ) COMPONENTS
= SAFETY RELATED PARTS.
' MARK= X-RAY RELATED PARTS.
This circuit diagram is a standard one, printed circuits
may be subject to change for product improvement
without prior notice.
WAVE FORMS
SCHEMATIC DIAGRAM: CRT, FRONT AV Unit
654321
A
B
C
D
E
F
G
H

27K-X2000 27K-X2000
121110987654321
A
B
C
D
E
F
G
H
19 20
SCHEMATIC DIAGRAM: MAIN-1 Unit

27K-X2000 27K-X2000
121110987654321
A
B
C
D
E
F
G
H
21 22
SCHEMATIC DIAGRAM: MAIN-2 Unit

27K-X2000 27K-X2000
121110987654321
A
B
C
D
E
F
G
H
23 24
SCHEMATIC DIAGRAM: SUB and SURROUND Unit

27K-X2000 27K-X2000
121110987654321
A
B
C
D
E
F
G
H
25 26
SCHEMATIC DIAGRAM: P-IN-P Unit

27K-X2000 27K-X2000
121110987654321
A
B
C
D
E
F
G
H
27 28
PRINTED WIRING BOARD ASSEMBLIES
PWB-A : MAIN Unit (Wiring Side)