Sharp 34N-WF5H User manual

1
34N-WF5H
COLOR TELEVISION
Chassis No. D00A
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.
S40Z134N-WF5H
SHARP CORPORATION This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
»ELECTRICAL SPECIFICATIONS.................................1
»IMPORTANT SERVICE SAFETY PRECAUTION ........2
»LOCATION OF USER'S CONTROL.............................4
»DIMENSIONS...............................................................6
»REMOVINGTHE MAJOR PARTS ................................7
»DRESSING THE LEADS............................................10
»INSTALLATION AND SERVICE INSTRUCTIONS......11
Page
CONTENTS
SERVICE MANUAL
34N-WF5H
MODEL
ELECTRICAL SPECIFICATIONS
VIDEO INPUT ............. (INPUT 1, 2, 3, 4) Composite
Input Jack :Pin-jack ×1
Input Level :1Vp-p/75 ohm/Negative Sync
S-VIDEO INPUT .......... (INPUT 1, 2, 3)Y/C
Y :1 Vp-p/75 ohm/Negative Sync
C :0.286Vp-p/75 ohm
COMPONENT INPUT... (INPUT 4, 5) Component (Y, PB, PR)
Input Jack :Pin-jack ×3 (INPUT 4),
BNC ×3 (INPUT 5)
Input Signal: 480I, 480P, 1080I
Y :1 Vp-p/75 ohm/Negative Sync
PB, PR:0.525 Vp-p/75 ohm
(75% Saturation Level)
HD INPUT ................... (INPUT 3) R, G, B, H.V/R, G, B
Input Jack :D-Sub 15pin ×1
Input Signal: 480P, 1080I
RGB :0.7 Vp-p/75 ohm/No Sync
AUDIO INPUT ............. (INPUT 1, 2, 3, 4, 5)
Input Jack :Pin-jack ×2
0.5 Vrms/22k ohm or over
LINE OUTPUT............. Input Jack :Pin-jack ×2
0.89 Vrms (Max)/2.2k ohm or
less/Veriable
POWER INPUT...................................................... 120V AC 60 Hz
POWER RATING ..................................................................205 W
PICTURE SIZE ..........................................3,160 cm2 (489 sq 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 ....24 W (12 W + 12 W)(at 10% distortion and
Dual CH Operate)
SPEAKER
SIZE ................................ 10 cm (BOX)(2 pcs.),Tweeter (2 pcs.)
VOICE COIL IMPEDANCE................................6 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.)
Specifications are subject to change without
prior notice.
»ELECTRICAL ADJUSTMENT ....................................12
»CHASSIS LAYOUT.....................................................26
»BLOCK DIAGRAM .....................................................28
»SCHEMATIC DIAGRAMS ..........................................32
»PRINTED WIRING BOARD ASSEMBLIES................65
»REPLACEMENT PARTS LIST....................................76
»PACKING OF THE SET ............................................103
Page

2
34N-WF5H
IMPORTANT SERVICE SAFETY PRECAUTION
Service work should be performed only by qualified service technicians who are
thoroughly familiar with all safety checks and the servicing guidelines which follow:
CAUTION: FOR CONTINUED
PROTECTION AGAINST A
RISK OF FIRE, REPLACE
ONLY WITH SAME TYPE 5A-
125V FUSE.
X-RADIATION AND HIGHVOLTAGE LIMITS
1. Be sure all service personnel are aware of the
proceduresand instructionscoveringX-radiation.The
only potential source of X-ray in current solid state
TV receivers is the picture tube.However, the picture
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. Highvoltageshould always bekept atthe 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 highvoltageregulator isoperatingproperly
thereis nopossibilityof anX-radiationproblem.Every
timea colorchassisis serviced, thebrightnessshould
be tested while monitoring the high voltage with a
meter to be certain that the high voltage does not
exceed the specified value and that it is regulating
correctly.
5. Do not use a picture tube other than that specified or
make unrecommended circuit modifications to the
high voltage circuitry.
6. Whentroubleshooting andtakingtest measurements
ona receiverwith excessivehighvoltage,avoidbeing
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. Semiconductorheat sinksarepotentialshockhazards
when the chassis is operating.
4. The chassis in this receiver has two ground systems
which are separated by insulating material.The non-
isolated (hot) ground system is for the B+ voltage
regulator circuit and the horizontal output circuit.The
isolated ground system is for the low B+ DC voltages
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.
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.
5A 125V

3
34N-WF5H
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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 and 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
resistorparalleled bya0.15µFcapacitorinseries with
all exposed metal cabinet parts and a known earth
ground,such aselectrical conduitorelectricalground
connected to earth ground.
•Use an AC voltmeter having with 5000 ohm per volt,
or higher, sensitivity to measure the AC voltage drop
across the resistor.
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 and 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 mustnot exceed0.5 milliamp.
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.
For continued protection, replacement parts must be
identical to those used in the original circuit.The use of
substitutereplacement partswhichdo nothavethe same
safety characteristics as the factory recommended
replacement parts shown in this service manual, may
create shock, fire, X-radiation or other hazards.
1.5k ohm
10W
0.15µF
TEST PROBE
TO EXPOSED
METAL PARTS CONNECT TO
KNOWN EARTH
GROUND
AC
VOLTMETER
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
necessarilyincreasedbyusingreplacementcomponents
rated for higher voltage, wattage and 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.

4
34N-WF5H
S-VIDEO VIDEO IN 2 L-AUDIO-R
INPUTCH – VOL + MENU DEGAUSS
Front control section
IN DOOR
DEGAUSS button
Press the DEGAUSS button to improve color unevenness of the screen
caused by moving the TV or changing the angle of the screen.
POWER
Press →
→
On.
Press again Off.
MENU button
Press MENU button to
access the MAIN MENU
screen
VOL(+)/(–) buttons
(+) Increases sound
(–) Decreases sound
SENSOR AREA
FOR REMOTE CONTROL
CH(up)/(down) buttons
( ) Selects next higher channel
( ) Selects next lower channel
INPUT button
Selects Input No. S-VIDEO input VIDEO input
(These terminals are also provided on the rear)
AUDIO L/R
input
POWER
(Stand-by: RED
ON: GREEN)
VIEW TIMER
(RED) HD TV (GREEN)
LED
LOCATION OF USER'S CONTROL

5
34N-WF5H
LOCATION OF USER'S CONTROL (Continued)
DTV
STB
POWER
TV
A
ENTER
MENU
VOL CH
AV MODE
MUTE
INPUT
ANT-A/B
DISPLAY
FLASHBACK ENT.
CC
PLAY FF
POP
REW
PAUSE
STOP REC
SEARCH
SELECT
DDFC
G1550CE
TWIN CH
VIEW
MODE TWIN PICTURE
VCR
POWER
MTS/SAP
L - TWIN ZOOM - R
SWAP FREEZE
BCD
CATV
HD-Ready TV
VCR CH
FAVORITES
VCR
INPUT
Press →Switches to external video
INPUT 1 mode.
Press again →Switches to external video
INPUT 2 mode.
Press 3 times →Switches to external video
INPUT 3 mode.
Press 4 times →Switches to external video
INPUT 4 mode.
Press 5 times →Switches to external video
INPUT 5 mode.
Press 6 times →Switches back to the
original TV mode.
POWER
Press →On.
Press again →Off. (Stand-by)
FAVORITES buttons
• Used to select any of four preset channels.
Cursor buttons
Used to move cursor on menu screen.
ENTER button
CHANNEL UP/DOWN
(+) Selects next higher channel.
(–) Selects next lower channel.
VOLUME UP/DOWN
(+) Increases sound.
(–) Decreases sound.
MENU
Press →Accesses MAIN MENU.
Press again →Exits MAIN MENU.
AV MODE
MUTE
Press →Mutes sound.
Press again →Restores sound.
• CLOSED CAPTION appears when sound is muted.
DIRECT ACCESS
Accesses any channel by the keypad.
button: Sharp DTV Decoder only
ENT.
Used in some instances where a VCR or
Cable Converter Box requires an “enter”
command after selecting channels, when
using the DIRECT ACCESS button.
DISPLAY
Press →Displays receiving channel for 4
seconds.
Press again →Displays remaining time of
SLEEP TIMER and VIEW
TIMER for 4 seconds.
FLASHBACK
Returns to previously viewed channel.
VIEW MODE
Select view size.
CC (Closed Caption)
Displays captions during
closed-caption broadcasts.
MTS/SAP
MTS/SAP select
VCR CONTROL
DDFC
Used to select High-quality image.
LIGHT
When this button is pressed , some buttons on the
remote control unit will light. The lighting will turn off if no
operations are performed within about six seconds. This
button is used for performing operations in dark places.
ANT-A/B button
Press to switch between ANTENNA-A and
ANTENNA-B when you wish to watch TV.
Remote control mode select buttons
Use to switch the remote control unit modes.
• This remote control can be used to operate the TV,
a DTV/STB Decoder and a Cable TV converter.
• By selecting one of the three mode select buttons,
this remote control can be used to adjust common
functions, such as channel selection, for that device.
INFRARED TRANSMITTER WINDOW
POP FUNCTION
With the VIDEO inputs, you can watch two pictures at
the same time.
"-TWIN CH-': Used to switch the channel for the
sub-picture of the TWIN PICTURE
screen.
TWIN PICTURE: Press to turn the TWIN PICTURE
screen function on and off.
SEARCH: Press to select the SEARCH
screen mode.
SELECT: Selects the screen for switching
the channel or input source.
FREEZE: When this button is pressed with
the regular screen, will change to the
TWIN PICTURE screen and the
picture at the time the button was
pressed will become the sub-picture,
displayed as a frozen image.
L-TWIN ZOOM: The left screen is enlarged with the
TWIN PICTURE function.
TWIN ZOOM-R: The right screen is enlarged with the
TWIN PICTURE function.
SWAP: The left and right screens are
interchanged with the TWIN
PICTURE function.
Note
For use of this remote control with an analog TV.
Note
•The above shaded buttons on the Remote Control glow in the dark. To use the glow-in-the-dark display on the
remote control, place it under a fluorescent light or other lighting.
•The phosphorescent material contains no radioactive or toxic material, so it is safe to use.
•The degree of illumination will vary depending on the strength of lighting used.
•The degree of illumination will decrease with time and depending on the temperature.
•The time needed to charge the phosphorescent display will vary depending on the surrounding lighting.

6
34N-WF5H
DIMENSIONS
[Units: mm (inches)]
Top View
FrontView Side View

7
34N-WF5H
REMOVING THE MAJOR PARTS
1. Remove the 13 lock screws off the rear cover.
2. Holding up the chassis frame, draw out the chassis about 5 cm (1.31/32 inch) first, disconnect the
speaker leads from the signal Unit, and pull out the chassis all the way.
`
`
`
`
Get the air vent tip cracked.
Degaussing Coil
Coil Holders
(4 locations)
Detaching the cathode ray tube
1. Detach the anti-magnetized coil from the four coil holders
that are at the cathode ray tube corners of the cabinet.
2. Remove the four pairs of screws and nuts off the cathode
raytube, anddetach thecathoderay tube.(The tubeweighs
about 60 kg (132.2lbs).)
Cathode ray tube handling precautions
Discharging
There may be a build-up of high-tension static electricity at
the high-voltage electrode (covered with the anode cap on
top of the cathode ray tube). Before taking the anode out of
the cathode ray tube, get it discharged.
Carrying
The cathode ray tube weighs 60 kg (132.2lbs) or so and its
shape is awkward to fit your hands. Preferably make a two-
person team to carry and move the tube.
Disposal
The cathode ray tube is under high vacuum inside. Before
disposing of it, get the air vent tip at the tube’s neck socket
crackedin ordertoturn thetubetotheatmospheric pressure
level.
~
Cabinet B
~~
~
~
~~~
~~
~
Cabinet A
Signal Unit Frame
AC Filter Unit Frame
Rear Panel
Power Unit Frame
Frame Holder
Note: Cabinet B mounting procedure and
precautions
1. Position the cabinet B in parallel with the
cabinet A.Start pushing in the cabinet B.
2. Insert the cabinet B until the clearance
between the cabinets A and B becomes 150
mm or so. Look into the terminal opening in
the back of the cabinet B to make sure the
tuner PWB and shield are out of contact with
the speaker guide boss.
3. Finally insert the coupling ribs of the cabinet
B in this order: left rib, top rib and right rib
when viewed from the back of the product.

8
34N-WF5H
Servicing precautions
1. Protector Operation
This model is provided with five protector circuits.Below discussed are the behaviors and indications of these circuits.
(Note: In some cases, the LED flashing cycle and possible trouble spot may be inconsistent.)
1Over-current Protector Circuit:
A rush current into the flyback transformer is detected.The circuit is activated if an over-current flows in.
Indication: The power LED (red) flashes once.
2X-Radiation Protector Circuit:
This circuit is activated if the rectified heater voltage rises above its specified level.
Indication: The power LED (red) flashes once.
OFF
ON
0.2
(seconds)
1.4
0.2
3Vertical Output Protector Circuit:
The vertical output is detected. The circuit is activated if the vertical output is missing (horizontal-only
screen or the like).
Indication: The power LED (red) flashes twice
ON
OFF
0.2 0.2
1.4
0.2
0.2 0.2 0.2
(seconds)
4+B Under-voltage Protector Circuit:
The voltages at the 6V, 10V, 16V, 28V and 30V lines of the switching regulator are detected.The circuit
is activated if any of the voltages drops below its specified level.
5+B Over-voltage Protector Circuit:
The voltages at the 6V and 10V lines are detected.The circuit is activated if any of the voltages rises
above its specified level.
Indication: The power LED (red) flashes three times.
(seconds)
0.2 0.2 0.2
1.4
0.2 0.2
0.2 0.2 0.2
0.2 0.2
OFF
ON
2. Stop of Protector Operation
The protector may be kept inactive by opening the detection circuits or grounding C3230 and C3231 (on the Signal
Unit).The vertical output protector circuit, however, cannot be made inactive.
Note: Be sure to get the protector back to normal after servicing.

9
34N-WF5H
3. Self-diagnostic Function (Protector Circuit Operation)
This model is equipped with five protector circuits.Shown below are the detections of the protector circuits and
possible trouble spots (outlined).
+130V line
FBT
+10V line
+16V line
136
IC501
T630
4
7
10
R620
to FBT
Q750 Q782 Q3255
Q3224
Q781
C3231
C3230
D732 D731
D633
D790
D789
D786
D782
D781
D787
D792
D783
D772
D560
D582
IC3501
(DUNTKA140DE) (DUNTKA096DE) (DUNTKA163DE)
85
84
95
17
80
Q3208
ACPOW
Q3204
RY3701
(DUNTKA116DE)
Micom UNIT
Horizontal
Protector
Power Protector
Micro-processor
Vertical Protector
Relay Drive
AC Relay
AC Filter UNIT
Signal UNIT
Drive
Drive
IC3210
Inverter IC
+14V line
-14V line
IC770 (Chopper Regulator)
+6V line
+30V line
(VT line)
+28V line
(Audio + B)
Drive Circuit
Power UNIT
Current AMP.
Detection Circuit
A: Detection
B: Possible Trouble Spot
1Over-Current Protector Circuit
A: +130V line current detected
(Flyback transformer rush current detected)
B: •Flyback transformer defective
•Horizontal deflection circuit transistor or diode
short-circuited
•Flyback transformer secondary-side rectifier circuit
parts short-circuited or load circuit parts short-circuited
2X-Radiation Protector Circuit
A: Flyback transformer terminal 0voltage detected
B: •Resonance capacitor open
•Horizontal circuit open
4Switching Power Secondary-side under-voltage
protector circuit
A: +10V, +16V, +28V, +30V and 6V line voltages detected
B: •+B line rectifier circuit parts (diode, capacitor)
short-circuited
•+B line load short-circuited
5Switching Power Over-voltage Protector Circuit
A: +10V and +6V line voltage rise detected
B: •Switching power primary-side circuit in trouble
(causing voltage rise)
•Chopper regulator malfunctioning
3Vertical Output Protector Circuit
A: Vertical output (pulse) monitored and no-pulse
condition detected
B: +14V line circuit in trouble, causing voltage
drop (rectifier circuit parts short-circuited)
or circuit open.

10
34N-WF5H
DRESSING THE LEADS
Earth
GS SH
GS SH
Tightening torque:
1.17 ±0.19 N-m
(12 ±2 kg-cm)
Connect M.
Bundle M and EW.
Insert GS.
Connect K.
Bundle K.
Insert EW ×2
Insert EW
Insert NS.
Bundle K, GS, EW and NS.
Insert the PWB
(until securely locked).
Insert GS and dress
the leads with no
slack.Fold back and
bundle the leads.
Insert SH.
Connect M.
(Keep the M leads tight.)
Couple the speaker
connectors
(for both sides).
Couple the speaker
connectors
(for both sides).
Dress the speaker leads
(for both sides).
Catch them at the hooks indicated.
Dress the speaker leads
(for both sides).
Catch them at the hooks
indicated.
Connect
the coating ground lead
(2 points).
Connect Pu.
Remove the pin cover
and fit the CRT PWB.
Connect the anode
(after connecting the
coating ground lead).
Anode clamp: LHLDW1087CEKZ x2
Reposition the anode clamp.
Keep the CRT and other leads
10 mm or more away
from the anode lead.
Bundle the K and
anode leads.
Secure the CA leads
at 2 spots.
Secure the AC cord at 2 spots.
Place the core between
the two wire holders.
Insert the AC cord holder (LHLDK0014PEZZ)
into the indicated recess.
Speaker boxe:RSP-Z0109CEZZ x2
Place the speaker boxes in
position and tighten the 4 screws.
Screw:LX-TZ3096CEFD ×4
The wider side is the
positive terminal. Do not
confuse the right and left
speakers.Their polarities
are different from each
other.
Pu/Mg
Screw
Screw
å
å
å
å
å