Hitachi CPX1403MS Schematic
SERVICE MANUAL
MANUEL D'ENTRETIEN
WARTUNGSHANDBUCH
CAUTION:
Before servicing this chassis, it is important that the service technician read the “Safety
Precautions” and “Product Safety Notices” in this service manual.
No. 0423
CPX1403MS
Data contained within this Service
manual is subject to alteration for
improvement.
ATTENTION:
Avant d’effectuer l’entretien du châassis, le technicien doit lire les «Précautions de sécurité»
et les «Notices de sécurité du produit» présentés dans le présent manuel.
VORSICHT:
Vor Öffnen des Gehäuses hat der Service-Ingenieur die „Sicherheitshinweise“ und „Hinweise
zur Produktsicherheit“ in diesem Wartungshandbuch zu lesen.
Les données fournies dans le présent
manuel d’entretien peuvent faire l’objet
de modifications en vue de perfectionner
le produit.
Die in diesem Wartungshandbuch
enthaltenen Spezifikationen können sich
zwecks Verbesserungen ändern.
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
Monitor
November 2004
2
SERVICE
MANUAL
1. Precautions
--------------------------------- 3
1-1. Safety Precautions --------------------- 3
1-2. Servicing Precautions ----------------- 5
1-3. Precautions for Electrostatically
Sensitive Devices(ESDs) ---------------- 6
2. Specifications
------------------------------ 7
3. Description of Controls
----------------- 9
4. Alignment and Adjustments
---------- 10
4-1. Preadjustment -------------------------- 10
4-2. Factory/Service Mode ---------------- 10
4-3. Other Adjustments --------------------- 12
5. Using Devices and Description
------17
5-1.
Main Signal Processor(VDP3130Y)
-- 17
5-2. Vertical Output(LA78040) ------------ 20
5-3. Video Output Amplifier
(TDA6108JF) ------------------------------- 21
5-4.
Audio Output Amplifier(TDA7052A)
--- 22
5-5. Power(STR-F6654) -------------------- 23
5-6. Audio Select switch(CD4066BE) --- 24
6. Technical Study(SMPS Operation)
-- 25
6-1. VIN terminal(pin 4)
: Start-up circuit ---------------------------- 25
6-2. OCP/F.B. terminal(pin 1)
: Oscillator and constant voltage
control circuit -------------------------------- 27
6-3. OCP/F.B. terminal(pin 1)
OCP circuit ---------------------------------- 29
6-4. Drive circuit ------------------------------ 30
6-5. Latch circuit ------------------------------ 30
6-6. Thermal shutdown circuit ------------ 31
6-7. Overvoltage protection circuit ------- 31
7. Trouble Shooting
------------------------- 32
7-1. No Power -------------------------------- 32
7-2. No Raster -------------------------------- 33
7-3. No Sound -------------------------------- 34
8. Block Diagram
----------------------------- 35
9. PCB Layout
-------------------------------- 36
10. Parts List
----------------------------------- 38
11. Circuit Diagram
CONTENTS
3
1. Precautions
Follow these safety, servicing and ESD precautions to prevent
damage and protect against potential
hazards, such as electrical shock and X-rays.
1-1. Safety Precautions
1. Be sure that all of the built-in protective devices are replaced.
Restore any missing protective shields.
2. When reinstalling the chassis and its assemblies, be sure to restore all protective devices,
including
nonmetallic control knobs and compartment covers.
3. Make sure that there are no cabinet openings through which people-particularly children-might
insert fingers and contact dangerous voltages. Such opening include the spacing between
the picture tube and the cabinet mask, excessively wide cabinet ventilation slots, and improperly fitted back covers.
If the measured resistance is less than 1.0 megohm or greater than 5.2 megohms, an
abnormality exists that must be corrected before the unit is returned to the customer.
4. Leakage Current Hot Check (Figure 1-1)
Warning Do not use an isolation transformer during this test. Use a leakage current
tester or a metering system that complies with International Electrotechnical Commission
65.(IEC 65)
ALSO TEST WITH
PLUG REVERSED
POWER
CORD
TEST ALL
EXPOSED METAL
SURFACES
EARTH
GROUND
READING SHOULD NOT
BE ABOVE
<0.7mA PEAK AC<2mA DC.
DEVICE
UNDER
TEST
LEAKAGE
CURRENT
TESTER
5. With the unit completely reassembled, plug the AC line cord directly to the power outlet.
With the unit s AC switch first in the ON position and then OFF, measure the current
between a known earth ground (metal water pipe, conduit, etc.) and all exposed metal
parts, including
handle brackets, metal cabinets, screwheads and control shafts.
The current measured should not exceed < 0.7 mA peak AC < 2mA DC.
Reverse the power-plug in the AC outlet and repeat the test.
6. X-ray Limits
The picture tube is especially designed to prohibit X-ray emissions.
To ensure continued X-ray protection, replace the picture tube only with one that is the
same type as the original. Carefully reinstall the picture tube shields and mounting
hardware these also provide X-ray protection.
7. High Voltage Limits
High voltage must be measured each time servicing is done on the +B, horizontal
deflection or high voltage circuits.
8. High voltage is maintained within specified limits by close-tolerance, safety-related
components and adjustments. If the high voltage exceeds the specified limits, check
each of the special components.
9. Design Alteration Warning
Never alter or add to the mechanical or electrical design of this unit.
Example
Do not add auxiliary audio or video connectors. Such alterations might
create a safety hazard. Also, any design changes or additions will void the
manufacturer
s warranty.
10. Components, parts and wiring that appear to have overheated or that are otherwise
damaged should be replaced with parts that meet the original specifications. Always
determine the cause of damage or overheating, and correct any potential hazards.
11. Observe the original lead dress, especially near the following areas
Antenna wiring, sharp edges, and especially the AC and high voltage power supplies.
Always inspect for pinched, out-of-place, or frayed wiring.
Do not change the spacing between components and the printed circuit board. Check
the AC power cord for damage. Make sure that leads and components do not touch
thermally hot parts.
12. Picture Tube Implosion Warning
The picture tube in this receiver employs "integral implosion"protection.
To ensure continued implosion protection, make sure that the replacement picture tube
is the same as the original.
13. Do not remove, install or handle the picture tube without first putting on shatterproof
goggles equipped with side shields.
Never handle the picture tube by its neck. Some
"
in-line"picture tubes are equipped
with permanetly attached diflection yoke do not try to remove such "permanently
attached"yokes from the picture tube.
4
5
14. Product Safety Notice
Some electrical and mechanical parts have special safety-related characteristics which
might not be obvious from visual inspection.
These safety features and the protection they give might be lost if the replacement
component differs from the original-even if the replacement is rated for higher voltage,
wattage, etc.
Components that are critical for safety are indicated in the circuit diagram by
shading( )
Use replacement components that have the same ratings, especially for flame
resistance and dielectric strength specifications. A replacement part that does not have
the same safety characteristics as the original might create shock, fire or other hazards.
1-2. Servicing Precautions
Waning 1 First read the "Safety Precaution"section of the manual.
If some unforeseen circumstance creates a conflict between the servicing and
safety precautions, always follow the safety precaution.
Warning 2
An electrolytic capacitor installed with the wrong polarity might explode.
1. Servicing Precautions are printed on the cabinet. Follow them.
2. Always unplug the unit s AC power cord from the AC power source before attempting
to (a) Remove or reinstall any component or assembly, (b) Disconnect an electrical
plug or connector, (c) Connect a test component in parallel with an electrolytic capacitor.
3. Some components are raised above the printed circuit board for safety.
An insulation tube or tape is sometimes used. The internal wiring is sometimes clamped
to prevent contact with thermally hot components.
Reinstall all such elements to their original position.
4. After servicing, always check that the screws, components and wiring have been
correctly reinstalled. Make sure that the portion around the serviced part has not been
damaged.
5. Check the insulation between the blades of the AC plug and accessible conductive parts
(examples
metal panels,. input terminals).
6. Insulation Checking Procedure Disconnect the power cord from the AC source and
turn the power switch ON. Connect an insulation resistance meter (500V) to the blades of
the AC plug.
The insulation resistance between each blade of the AC plug and accessible conductive
parts (see above) should be greater than 1 megohm.
7. Never defeat any of the B+ voltage interlocks. Do not apply AC power to the unit (or any
of its assemblies) unless all solid-state heat sinks are correctly installed.
5
6
8. Always connect a test instrument s ground lead to the instrument chassis ground before
connecting the positive lead always remove the instrument s ground lead list.
1-3. Precautions for Electrostatically Sensitive Devices (ESDs)
1. Some semiconductor ("solid state") devices are easily damaged by static electricity.
Such some components are called Electrostatically Sensitive Devices (ESDs) examples
include integrated circuits and some field-effect transistors. The following techniques will
reduce the occurrence of component damage caused by static electricity.
2. Immediately before handling any semiconductor components or assemblies, drain the
electrostatic charge from your body by, touching a known earth ground. Alternatively,
wear the discharging wrist-strap device. (Be sure to remove it prior to applying powerthis is an electric shock precaution)
3. After removing an ESD-equipped assembly, place it on a conductive surface such as
aluminum foil to prevent accumulation of electrostatic charge.
4. Do not use freon-propelled chemicals. These can generate electrical charges that
damage ESDS.
5. Use only a grounded-tip soldering iron when soldering or unsoldering ESD
S.
6. Use only an anti-static solder removal device. Many solder removal devices are not rated
as "anti-static" these can accumulate sufficient electrical charge to damage ESDS.
7. Do not remove a replacement ESD front its protective package until you are ready to
install it. Most replacement ESDs are packaged with leads that are electrically shorted
together by conductive foam, aluminum foil or other conductive materials.
8. Immediately before removing the protective material from the leads of a replacement
ESD, touch the protective material to the chassis or circuit assembly into which the
device will be installed.
9. Minimize body motions when unpackaged replacement ESDs. Motion, such as brushing
clothes together, or lifting a foot from a carpeted floor can generate, enough static
electricity to damage an ESD.
6
7
2. Specifications
MODEL : CT14KQ
DESCRIPTION : 14 INCH CCTV WITH 2 CH CHMERA INPUT &
HORIZONTAL RESOLUTION 450 LINES
1) SPECIFICATIONS
COLOR SYSTEM : NTSC 3.58 / PAL-B
POWER INPUT : AC 100-240V(50/60 Hz)
POWER CONSUMPTION : 45W
VIDEO IMPEDANCE : 75Ohm BNC
SOUND OUTPUT : 1.0
0.2W 8 Ohm
SPEAKER SIZE : 70mm
40mm
VIDEO OUTPUT LEVEL : 1.0V
p-p 10% at 75 Ohm
VIDEO INPUT LEVEL : 1.0V
p-p 10% at 75 Ohm
AUDIO OUTPUT LEVEL : RCA JACK TYPE
300
50mVrms
AUDIO INPUT LEVEL : RCA JACK TYPE
300
50mVrms
SOUND DISTORTION : Less Than 10%
HUM : Less Than 10mVrms
BUZZ : Less than 200mV
p-p
2) FEATURES
PROTECTION CIRCUIT FOR X-RAY
S-VIDEO INPUT
VIDEO THROUGH-OUT
3) CONTROLS & SWITCHES
MAIN AC POWER S/W : PUSH LOCK FRONT
PICTURE CONTROL : ROTARY FRONT
(CONTRAST, BRIGHTNESS, TINT, COLOR, SHARPNESS)
VOLUME CONTROL : ROTARY FRONT
S-VIDEO/CAMERA SELECTION : TACT SWITCH FRONT
7
8
4) LIGHTINGS
INDICATOR : POWER ON (GREEN)
: VIDEO 1 (GREEN)
: VIDEO 2 (GREEN)
: S-VIDEO (GREEN)
5) JACK & TERMINALS
4 BNC : VIDEO INPUT/OUTPUT
6 AUDIO RCA : AUDIO INPUT/OUTPUT
S-VHS MINI DIN : S-VIDEO INPUT
AC INLET : AC INPUT
6) ACCESSORIES
WARRANTY CARD
OWNER’S MANUAL
POWER CORD
7) CABINET SIZE
350(W) 328(H) 371(D)
8) PACKING
BOX OUT : 437(W) *427(H) *450(D)
Q TY SET PER 40 FOOT FCL : 675 SETS
Q TY SET PER 20 FOOT FCL : 325 SETS
9) REMARKS
WEIGHT : 14Kg
899
3. Description of controls
WARNING : TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS
CCTV TO RAIN OR MOISTURE
Front View Side View
Rear View
123456 78910
11
12 15 16 1721
22
1314 181920
23
1. TINT
2. SHARPNESS
3. COLOR
4. BRIGHTNESS
5. CONTRAST
6. VOLUME
7. VIDEO 1
8. VIDEO 2
9. S-VIDEO
10. POWER BUTTON
11. POWER LED LAMP
12. AC INLET
13. VIDEO 1 IN
14. VIDEO 2 IN
15. VIDEO 1 OUT
16. VIDEO 2 OUT
17. S-VIDEO
18. AUDIO V1 IN
19. AUDIO V2 IN
20. AUDIO S-VIDEO IN
21. AUDIO V1 OUT
22. AUDIO V2 OUT
23. AUDIO S-VIDEO OUT
10
4. Alignment and Adjustments
4-1. Preadjustment
4-1-1. Factory Mode
1. Do not attempt these adjustments in the VIDEO mode.
2. The Factory Mode adjustments are necessary when either the EEPROM(Q002) or the CPT
is replaced.
3. Do not tamper with the "Adjustment" screen of the Factory Mode menu. The screen is intended
only for factory use.
4-1-2. When EEPROM (Q002) is replaced
1. When Q002 is replaced all adjustment data revert to their initial values. It is necessary to reprogram this data.
2. After Q002 is replaced, warm up the CCTV SET for 10 seconds.
4-1-3. When CPT is replaced
1. Make the following the adjustments after setting up purity and convergence:
White Balance
Vertical center
Vertical size
Horizontal size
HRS
4-2. Factory / Service Mode
4-2-1. Procedure for the "Adjustment" Mode
1. This mode uses the standard remote control. The Factory (Service) Mode is activated by
pressing the "Factory" key on the remote control.
2. The Factory Mode will be displayed. The Factory Mode has eight components:
Screen adjustment, White Balance, Picture adjustment, Service 1, Service 2, Volume test,
EFPROM reset, Option adjust
3. Access the Adjustment Mode by pressing the PROGRAM keys (Up or Down).
The adjustment Parameters adjusted are listed in the accompanying table,
and they are selected by pressing the VOLUME keys (Left or Right).
4. The VOLUME keys increase or decrease the adjustment values, which are stored in the nonvolatile memory as soon as the adjustment is cancelled.
5. Cancel the Adjustment Mode by pressing the OUT CONDITION key.
10
11
FACTORY MODE
(1) WHITE BALANCE
(6500
K)
(2) WHITE BALANCE
(9300 K)
(3) PICTURE
(4) SERVICE 1
(5) SERVICE 2
(6) OPTION
OSD ABBREVIATION
R-CUTOFF
G-CUTOFF
B-CUTOFF
R-DRIVE
G-DRIVE
B-DRIVE
R-CUTOFF
G-CUTOFF
B-CUTOFF
R-DRIVE
G-DRIVE
B-DRIVE
HEIGHT
HRS
H-SIZE
PINCUSHION
TRAPEZIUM
Min
Cen
Max
Min
Cen
Max
Min
Cen
Max
Min
Cen
Max
Min
Cen
Max
VOL MAX ADJ.
SUB BRI
AGC
AUTO LOCK
INI.C.TEMP
BLUE BACK
COLOR TEMP.
LANGUAGE
INTIAL DATA
150
150
142
700
700
587
150
150
150
700
700
700
730
82
14
-1221
0
10
17
32
10
90
120
0
127
255
1
3
6
-87
0
87
145
20
OFF
ON
6500
OFF
DEL
DEL
REMARK
Key 1
Key 5
Key 9
Key 2
Key 6
Key 0
Key 1
Key 5
Key 9
Key 2
Key 6
Key 0
CONT
BRI
COLOR
SHARP
TINT
4-2-2.
12
4-2-3. Outcondition
The Outcondition Mode is used during factory inspection.
Function Reset
1. System Auto
4-3. Other Adjustments
4-3-1. General Alignment Instructions
1. Usually, a color CCTV needs only slight touch-up adjustment upon installation. Check the
basic characteristics such as height, horizontal and vertical sync and focus.
2. Observe the picture for good black and white details. There should be no objectionable
color, shading if color shading is present, perform the purity and convergence
adjustments described below.
3. Use the specified test equipment or its equivalent.
4. Correct impedance matching is essential.
5. Avoid overload. Excessive signal from a sweep generator might overload the front-end of
the CCTV SET. When inserting signal markers, do not allow the marker generator to distort
test results.
6. Connect the CCTV SET only to an AC power source with voltage and frequency as
specified on the backcover nameplate.
7. Do not attempt to connect or disconnect any wires while the CCTV SET is turned on.
Make sure that the power cord is disconnected before replacing any parts.
8. To protect against shock hazard, use an isolation transformer.
4-3-2. Automatic Degaussing
A degaussing coil is mounted around the picture tube, so that external degaussing after
moving the CCTV SET should be unnecessary.
But the receiver must be properly degaussed upon installation.
The degaussing coil operates for about 1 second after the power is switched ON. If the set is
moved or turned in a different direction, the power should be OFF for at least 10 minutes.
If the chassis or parts of the cabinet become magnetized, poor color purity will result. If this
happens, use an external degaussing coil. Slowly move the degaussing coil around the
faceplate of the picture tube and the sides and front of the receiver. Slowly withdraw the coil to
a distance of about 6 feet before turning power OFF.
If color shading persists, perform the following Color Purity and Convergence adjustments.
4-3-3. High V oltage Check
CAUTION There is no high voltage adjustment chassis. The B+power supply should be
+
135 volts (see table 1).
1. Connect a digital voltmeter to the second anode of the picture tube.
2. Turn on the CCTV SET. Set the Brightness and Contrast controls to minimum.
3. Adjust the Brightness and Contrast controls to both extremes.
Ensure that the high voltage does not exceed Maximum High voltage (see table 1) under
any conditions.
Table 1 +B and Maximum High voltage
4-3-4. FOCUS Adjustment
1. Input a cross dot signal.
2. Adjust the tuning control for clearest picture.
3. Adjust the FOCUS control for well defined scanning lines in the center area of the screen.
4-3-5. Screen Adjustment
1. Tune to the ACTIVE channel.
2. Adjust the FACTORY key is pressed on Remote Controller, Factory Mode shows up.
3. Selected OSD color is red.
4. Select for screen adjustment to SUB BRI in SERVICE2 by pressing the
PROGRAM( )key and VOL+key.
5. Adjust the SCREEN VR of FBT for a normal picture is no blooming.
6. After white balance adjustment, once again Select for detail screen adjustment to
SUB BRI in SERVICE2 by pressing the PROGRAM(
)key and change the value
of SUB BRI by VOL+key.
4-3-6. Purity Adjustment
1. Warm up the receiver for at least 30 minutes.
2. Plug in the CRT deflection yoke. Tighten the clamp screw.
3. Plug the convergence yoke into the CRT and set it as shown in Fig. B-1.
4. Input a black and white signal.
5. Fully demagnetize the receiver by using an external degaussing coil.
6. Turn the CONTRAST and BRIGHTNESS controls to maximum.
7. Loosen the clamp screw holding the yoke. Slide the yoke backward or forward to produce a
vertical green belt. (Fig. B-2)
8. Tighten the convergence yoke.
13
+
B (Volts)
135
Maximum High Voltage
26 KV
14
9. Slowly move the deflection yoke forward. Adjust for the best overall green screen.
10. Temporarily tighten the deflection yoke.
11. Produce blue and red rasters by adjusting the-low-light controls.
Check for good purity in each field.
12. Tighten the deflection yoke.
4-3-7. Center Convergence Adjustment
1. Warm up the receiver for at least 30 minutes.
2. Adjust the two tabs of the 4-pole magnets Change the angle between them.
Superimpose the red and blue vertical lines in the center area of the screen.
3. Adjust the BRIGHTNESS and CONTRAST controls for a well-defined picture.
4. Adjust the two tabs of the 4-pole magnets, and change the angle between them.
Superimpose the red and the blue vertical lines in the center area of the screen.
5. Turn both tabs at the same time, keeping the angle constant, and superimpose the red and
blue horizontal lines in the center of the screen.
6. Adjust ing two-tabs of 6-pole magnets to superimpose the red and blue lines onto the green.
Adjusting the angle affects the vertical lines, and rotating both magnets affects the horizontal
lines.
7. Repeat adjustments 2-6, if necessary.
8. Since the 4-pole and 6-pole magnets interact, the dot movement is complex(fig B-3).
FIG. B-1 CONVERGENCE MAGNET ASSEMBLY
6 Pole Magnet
4 Pole Magnet
2 Pole Magnet
2 Pole
PURITY
4 Pole
CONVERGENCE
6 Pole
CONVERGENCE
YOKE
CLAMP
SCREW
Clamper
Screw
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