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SERVICE MANUAL R/C: CLU-417UI

pNUSGI (Asawu4 cclAssos 1

CAUTION: Before servicing this chassis, it is important that the service technician read
the "Safety Precautions" and "Product Safety Notices" in this Service Manual.

Ihis television receiver will display television 1
Closed Captioning (m or u ) in accordance
with ParaaraDh 15.119 of the FCC rules.


TABLE OF CONTENTS
SAFETY PRECAUTIONS .................................................... 2 WIRING DRAWING OF 35CX45B/CZ67 FINAL
ASSEMBLY ........................................................................ 54
PRODUCT SAFETY NOTICE.. ............................................ 3
PRINTED WIRING BOARD FOIL PATTERN.. .................. 55
POWER SOURCE.. ............................................................ .3
CIRCUIT SCHEMATIC DIAGRAM.. ................................... 57
TECHNICAL SPECIFICATIONS .......................................... 4
CIRCUIT SCHEMATIC DIAGRAM OF P in P.. .................. 58
TECHNICAL CAUTIONS ..................................................... 5
CIRCUIT SCHEMATIC DIAGRAM OF 32CX12B/CY62
ADJUSTMENT SPECIFICATIONS ...................................... 6 and 35CX45BlCZ67 ........................................................... 59
WAVEFORMS AT EACH SECTION .................................. 26

TROUBLESHOOTING FLOWCHARTS.. ........................... 30

REPLACEMENT PARTS LIST ........................................... 33

NOTES ............................................................................ .50
WIRING DRAWING OF 32CX12BKY62
FINAL ASSEMBLY ............................................................ 53




SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

SOLID STATE COLOR TELEVISION
DECEMBER 1996 HHEA- MANUFACTURING DIVISION
A3LXU4

SAFETY PRECAUTIONS

NOTICE: Comply with all cautions and safety related notes Leakage Current Hot Check
located on or inside the cabinet and on the chassis or pic-
ture tube. Plug the AC line cord directly into an AC 120V 60Hz outlet
(do not use an isolation transformer for this check). Turn
WARNING: Since the chassis of this receiver is connected the AC power ON. Using a "Leakage Current Tester
to one side of theAC power supply during operation, when- (Simpson's Model 229 or equivalent)", measure for current
ever the receiver is plugged in, service should not be at- from all exposed metal parts of the cabinet (antennas,
tempted by anyone unfamiliar with the precautions neces- screwheads, overlays, control shafts, etc.) particularly any
sary when working on this type of receiver: exposed metal part having a return path to the chassis or to
a known earth ground (water pipe, conduit, etc.). Any cur-
The following precautions should be observed: rent measured must not exceed OSmA.
1. Do not install, remove, or handle the picture tube in any
manner unless shatterproof goggles are worn. People
not so equipped should be kept away from the picture
tube while handling. `I (READING

2. When service is required, an isolation transformer should El0 SHOULD
BE ABOVE
NOT



I
be inserted between power line and the receiver before LEAKAGE OSmA)
DEVICE CURRENT
any service is performed on a "HOT" chassis receiver UNDER \TESTER ~
TEST `+ -
I
3. When replacing a chassis in the receiver; all the protec- TEST ALL
tive devices must be put back in place, such as barriers, EXPOSED METAL
nonmetallic knobs, adjustment and compartment cover- SURFACES
shields, isolation resistors, capacitors, etc. Z-WIRE CORD

4. When service is required, observe the original lead dress
ALSO TEST WITH
in the high voltage circuitry area. PLUG REVERSED
(USING AC ADAPTER
5. Always use the manufacturer's replacement components. PLUG AS REQUIRED)
Critical components as indicated on the circuit diagram
should not be replaced by another manufacturer's. Fur-
thermore, where a short circuit has occurred, replace
those components that indicate evidence of overheat- AC LEAKAGE TEST
ing.
ANY MEASUREMENTS NOT WITHIN THE LIMITS OUT
6. Before returning a serviced receiver to the customer, LINED ABOVE ARE INDICATIVE OF A POTENTIAL
the service technician must thoroughly test the unit to be SHOCK HAZARDAND MUST BE CORRECTED BEFORE
certain that it is completely safe to operate without dan- RETURNING THE RECEIVER TO THE CUSTOMER.
ger of electrical shock, and be sure that no protective
device built into the receiver by the manufacturer has High Voltage
become defective, or inadvertently defeated during ser-
This receiver is provided with a hold down circuit for clearly
vicing.
indicating that voltage has increased in excess of a prede-
Therefore, the following checks should be performed for the termined value. Comply with all notes described in this Ser-
vice Manual regarding this hold down circuit when servic-
continued protection of the customer and service technician.
ing, so that this hold down circuit is operated correctly.
Leakage Current Cold Check
With the AC plug removed from the 120VAC 60Hz source, Serviceman Warning
place a jumper across the two plug prongs. Turn the AC With minimum BRIGHTNESS and CONTRAST, the operat-
power switch ON using an insulation tester (D&OOV), con- ing high voltage in this receiver is lower than 37.OKL! In
case any component having influence on the high voltage is
nect one lead to the jumperedAC plug and touch the other
lead to each exposed metal part (antennas, screwheads, replaced, confirm that high voltage with minimum BRIGHT
metal overlays, control shafts, etc.), particularly any exposed NESS and CONTRAST is lower than 37.OKV To measure
metal part having a return path to the chassis should have a high voltage use a high impedance High ultage Meter. Con-
minimum resistor reading of 0.24MD and a maximum resis- nect (-) to chassis earth and (t) to the CPTAnode button
tor reading of 5.2MQ . Any resistance value below or above (See the following connection diagram).
this range indicates an abnormality which requires correc-
tive action. Exposed metal part not having a return path to NOTE: Turn the power switch OFF without fail before the
the chassis will indicate an open circuit. connection to the Anode button is made.



2
A3LXU4

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in HITACHI television This Service Manual is intended for qualified service techni-
receivers have special safety related characteristics. These cians; it is not meant for the casual do-it-yourselfer Quali-
are often not evident from visual inspection nor can the pro- fied technicians have the necessary test equipment and
tection afforded by them necessarily be obtained by using tools, and have been trained to properly and safely repair
replacement components rated for higher voltage, wattage, complex products such as those covered by this manual.
etc. Replacements parts which have these special safety Improperly performed repairs can adversely affect the prod-
characteristics are identified in this Model Service Manual. uct and its safety. Consumers should not risk trying to do
the necessary repairs and should instead refer to a quali-
Electrical components having such features are identified fied service technician.
with an A mark in the schematics and parts list in this Model
Service Manual. WARNING
Lead in solder used in this product is listed by the California
The use of a substitute replacement component which does Health and Welfare agency as a known reproductive toxi-
not have the same safety characteristics as the HITACHI cant which may cause birth defects or other reproductive
recommended replacement one, shown in the parts list in harm
this Model Service Manual, may create shock, fire, X-Ra- (California Health and Safety Code, Section 25249.5).
diation, or other hazards.
When servicing or handling circuit boards and other compo-
Production Safety is continuously under review and new in- nents with lead in solder, avoid unprotected skin contact with
structions are issued from time to time. For the latest infor- the solder. Also, when soldering do not inhale any smoke or
mation, always consult the current HITACHI Service fumes produced.
Manual. Asubscription to, or additional copies of HITACHI
Service Manual may be obtained at a nominal charge from
HITACHI SALES CORPORATION. SAFETY NOTICE
USE ISOLATION TRANSFORMER
CPT ANODE WHEN SERVICING
\

Components having special safety characteristics are iden-
tified by Aon the parts list in this Model Service Manual
CPT
and its supplements and bulletins. Before servicing this, it is
important that the service technician read and follow the
"Safety Precautions" and the "Product Safety Notices" in
H.V. METER this Service Manual.
`CHASSIS GROUND

For continued X-Radiation protection, replace picture tube
with original type or Hitachi equivalent type.

X-Radiation POWER SOURCE

TUBE: The primary source of X-Radiation in this receiver is This television receiver is designed to operate on 120Voltsl
the picture tube. The tube utilized in this chassis is spe- 60Hz, AC house current. Insert the power cord into a 120
cially constructed to limit X-Radiation emission. For contin- Volts/GOHz outlet.
ued X-Radiation protection, the replacement tube must be
the same type as the original HITACHI approved type. NEVER CONNECTTHETVTO OTHERTHAN THE SPECI-
FIED VOLTAGE OR TO DIRECT CURRENT.
When troubleshooting and making test measurements in a
receiver with an excessive high voltage problem, avoid Use of this TV set in 50 Hz areas will not harm then/ set,
coming unnecessarily close to the picture tube and the high However, it will cause the clock display to run slower: Con-
voltage component. sult service personnel if you move to an area where the
power supply frequency is 50 Hz.
Do not operate the chassis longer than is necessary to lo-
cate the cause of the excessive voltage.
A3LXU4 I
TECHNICAL SPECIFICATIONS
POWER RATINGS

32CX12B/CY62 .. . .. .. .. .. ..*......................................... 190 watts
35CX45B/CZ67 . . .. . .. ... . ... .. ... .. .. .. .. .. .. .. ... .. .. .. ... .. .. ... .. . 205 watts



COLOR PICTURE TUBE

32CX12B/CY62 .. . .. .. .. ... .. .. ... .. .. .. .. .. ... . ... .. .. .. ... .. ... . A80LJF30X
35CX45B/CZ67 ... .. .. .. .. .. .. ....a..............*............ A89AE J 15X02




CAUTION
The following symbol near the fuse indicates fast operating fuse (to be replaced). Fuse ratings appear within the symbol.
Example:




The rating of fuse F901 is 5.OA-125V
Replace with the same type fuse for continued protection against fire.




4
A3LXU4

TECHNICAL CAUTIONS

High Voltage Limiter Circuit Operation Check and Overvoltage Protection Circuit Operation Check

Adjustment Preparation
1. Connect a High Voltage Voltmeter between CPTAnode terminal (Anode capside) and Ground. (TP701)
2. Set the AC input voltage to 120 +/- 3V
3. Receive Circle Pattern or Broadcast Si nal and set "BRIGHTNESS" and "CONTRAST" to maximum. Adjust the SCREEN
VR and SUB-BRIGHTNESS VR (R34 8 so that BeamCurrent is la + 0.1 mA. (The voltage at ABL terminal (C747) should
be 12V or less.)

1 High Voltage Voitmster
(DC I+ltage Divider)
CPT Anode

Use the Voltmeter which can
indicate up to the firsi
6
decimal point wim
an impedance of lOMs2 or more.
I\ + m-w mm
+ . I 10
I I
4 I
I
DigitalVoltmeter 6
I
I %.
CPT Ground wire


Adjustment Preparation
1. Check that the normal High Mltage is EHT +l KV.

CHASSIS EHT=l KV IB 2 0.1 mA El +1.3d
CZ67 3O.QW 1.70mA 36.OUV
CY62 3o.oKv 1.50mA 36.OKV



Ad'ustment Preparation
4. kiet AC input voltage to 100 + 5V. Short circuit both ends of R903.

I I
I CPTAnode
Short Circuit
High Voltage Voltmeter
(DC Voltage Divider)




CPT Ground Wire
(TP701)
Digital Voltmeter



Use the voltmeter impedance 10M Q or more with indication to the first decimal place.
Adjustment Procedure
2. Keep CONTRAST, BRIGHTNESS, and SCREEN VR as in item (3). increase AC input voltage gradually and check that
the picture disappears when high voltage is El. Immediately after checking that it disappears, turn OFF the set switch.
Remove adjustment Jig and High Voltage Voltmeter. When connecting or removing High Voltage Voltmeter to or from
Anode cap, be sure to turn OFF the switch of the set. Also, be sure to perform it after the chassis discharge of residual
high voltage, because the high voltage of CPTAnode may be left.




5
A3LXU4

ADJUSTMENT SPECIFICATIONS

A3LXU4 CHASSIS PAGE #

I. MAIN CHASSIS ADJUSTMENT ........................................................................................................................................................... 8

1. 1% Bus System ........................................................................................................................................................................ 8
2. Adjustment Procedure - Start-Up ............................................................................................................................................... 8
2-l How to Get to Adjustment Code ......................................................................................................................................... 8
2-2 Changing Data and Adjustment Code ................................................................................................................................ 8
3. Adjustment Mode ....................................................................................................................................................................... 8
4. Adjustment Procedure ............................................................................................................................................................... 9
4-1 VCO for OSD Adjustment ................................................................................................................................................... 9
4-2 Deflection Circuit Picture Adjustment Check ...................................................................................................................... 9
4-2-l Verticle Size Adjustment (R62A) .............................................................................................................................. 9
4-2-2 Side Pin Distortion Coarse Adjustment (R752) ........................................................................................................ 9
4-2-3 Horizontal Side Adjustment (R755) ........................................................................................................................ 10
4-2-4 High Voltage Limiter Circuit Operation Check and Overvoltage Protection Circuit Operation Check .................... 10
4-2-5 FBT Protection Circuit Operation Check ................................................................................................................ 10
4-2-6 +16V Short Protection Circuit Check ...................................................................................................................... 10
4-2-7 Load Reduction Circuit Operation Check ............................................................................................................... 10
4-2-8 MFC Circuit Operation Check (35CX45BKZ67 Only) ........................................................................................... 11
4-3 MTS Adjustment ............................................................................................................................................................... 11
4-3-l Input Level Adjustment ........................................................................................................................................... 11
4-3-2 Stereo VCO Adjustment ......................................................................................................................................... 11
4-3-3 Filter Adjustment ..................................................................................................................................................... 11
4-3-4 Separation Adjustment ........................................................................................................................................... 12
4-3-5 SAP VCO Adjustment ............................................................................................................................................. 12

II. MEMORY INITIALIZE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......*....................................... 12

4-4 Timer Sound Operation Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .................. 12

Ill. OPERATION CHECK ....................................................................................................................................................................... 12
4-5 AFC Operation Check ....................................................................................................................................................... 12
5. Channel Selection Circuit Operation Check ............................................................................................................................. 12
5-l Channel Up/Down Selection ............................................................................................................................................. 12
5-2 Channel Up/Down Selection (Sub-Picture) ....................................................................................................................... 13
5-3 Volume Up/Down .............................................................................................................................................................. 13
5-4 Power On/Off .................................................................................................................................................................... 13
5-4-l Input ....................................................................................................................................................................... 13
5-5 Menu ................................................................................................................................................................................. 13
5-6 Menu Mode (Using Remo-Con) ........................................................................................................................................ 14
5-6-l Set-Up Mode .......................................................................................................................................................... 14
5-6-2 Customize Mode .................................................................................................................................................... 14
5-6-3 Video Mode ............................................................................................................................................................ 15
5-6-4 Audio Mode ............................................................................................................................................................ 15

IV. P IN P OPERATION CHECK .............................................................................................................................................................. 16
6. PinP ..................................................................................................................................................................................... 16
6-1 Move .................................................................................................................................................................................. 16
6-2 Swap .................................................................................................................................................................................. 16
6-3 Freeze ................................................................................................................................................................................ 16
6-4 Freeze (at P in P off) .......................................................................................................................................................... 17
6-5 Weak Electric Field Check ................................................................................................................................................. 17

V. YNR OPERATION CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ......................................... 17




6
A3LXU4




VI. FINAL ADJUSTMENT/COMMON SERVICE ADJUSTMENT . .... .. ... .... ... .... ...*................................................................................ 18

7-1. Purity Convergence Adjustment .......................................................................................................................................... 18
7-1-1. Purity Adjustment (Using Microscope) .................................................................................................................... -18
7-l-2. Purity Adjustment (Hand Operated) ........................................................................................................................ 19
7-1-3. Static Convergence Adjustment .............................................................................................................................. 21
7-l-4. Dynamic Convergence Adjustment ......................................................................................................................... 21

7-2. Focus Adjustment .. ... .... ... ... .... .. ... ... .... .. ... ... .... ... .... .... .. .... ... .... ... ... .... ... .... ... ... .... ... .... ... .. ... ... ... ... .......................................... 22

7-3. Deflection Circuit Picture Adjustment .................................................................................................................................. 22
7-3-l. Horizontal Center Adjustment ................................................................................................................................. 22
7-3-2. Vertical Size Adjustment ......................................................................................................................................... 22
7-3-3. Side Pin Distortion Adjustment ..................................................................................................... .......................... 22
7-3-4. Horizontal Size Adjustment ..................................................................................................................................... 22

7-4. White Balance Adjustment .................................................................................................................................................. 23

7-5. Sub-black Level Adjustment .... ... ... ... ... .. .... ... .... ... .... ... ... .... ... ... .... ... .... ... ... .... ... .... ... ... ... ... ... ... .. .... ... ... .... ... ........................... 23

7-6. Channel Selector Operation Check ..................................................................................................................................... 23
7-6-l. C.C.D. Display Position Adjustment ........................................................................................................................ 23

7-7. Matching Check with Other Equipments ............................................................................................................................. 23
7-7-l. VIDEO 1 input Terminal Matching Check ............................................................................................................... 23
7-7-2. VIDEO 2 Input Terminal Matching Check ............................................................................................................... 23
7-7-3. VIDEO 3 Input Terminal Matching Check ............................................................................................................... 23
7-7-4. S-INPUT Terminal Matching Check ........................................................................................................................ 24
7-7-5. AUDIO Output Level Check .................................................................................................................................... 24

7-8. Safety Check ....................................................................................................................................................................... 24
7-8-l. Polarity Check ......................................................................................................................................................... 24

7-9. MTS Operation Check ......................................................................................................................................................... 24
7-Q-l. STEREO/SAP Broadcast Receiving Check ............................................................................................................ 24
7-Q-2. MTS Mode Check ................................................................................................................................................... 24
7-Q-3. STEREO Separation Check .................................................................................................................................... 24

7-10. Setting for Delivery .............................................................................................................................................................. 24

7-11. Magnetic Field Correction Circuit Operation Check (35V ONLY) ........................................................................................ 24

VII. ADJUSTMENT POSITION LIST ... .. ... .... .. ... ... .... .... ... .... ... .... ... .. .... ... .... ... ... .... .... ... ... ... .... .. ... ... ... ... ... ... .... ... .... ... ...................... 25


Refer to CHASSIS SERVICE MANUAL PA NO. 0074 for additional technical information.
Note:
1. MAIN CHASSIS ADJUSTMENT is done with precision equipment. Readjustment is only recommended if the service technician
replaced a defective component related to the circuit.
2. COMMON SERVICE ADJUSTMENT is recommended for the service technician after final troubleshooting and repair is done. Quick
check and fine tuning is advisable to verify that the problem is eliminated.




7
A3LXU4
I. MAIN CHASSIS ADJUSTMENT *This data is an approximate service mode data. Fine
adjustment must be done using the specified test procedure
1. I'C BUS SYSTEM and adjustment tools.
A3lXU4 Chassis uses 1% Bus control System. Fig. 1 shows
this control system.
~SLAVEI
IMASTE6? r I
2-2 Changing Data and Adjustment Code
When set is in adjustment mode, the cursor
"4, p, A, v and "ENTER" keys of the customers
remo-con will be the adjustment keys.
A. Use any Hitachi remote control with "ENTER" button as
shown when making an adjustment.


1001 (Master) controls other ICs (slave). Adjustment data is
memorized in 1002 (EEPROM). IO01 read this data and controls
ENTER
other ICs.
0
Adjustment items applied in this chassis is shown in Table 1.


2. ADJUSTMENT PROCEDURE-START UP "A, v keys are used for changing adjustment code.
"4, b," keys are used for changing data.
2-1 How to Get to Adjustment Mode "ENTER" key is used for changing "Cut Off Mode" Normal
Chassis adjustment can be done by using the front control mode". (Refer to cut off adjustment)
panel buttons with CTV set turned off. Press "POWER" and
"MENU" or "INPUT" keys at the same time, and hold more than
3 seconds. The CTV set turns on in adjustment mode with OSD
as follows. 3. ADJUSTMENT MODE
If below display appears




Adjustment code can not be changed by cursor "A, v keys.




I I I I

"To Escape from Adjustment Mode" Set data "D020" at "AOO" or "D030" at "POO" by "4, b," keys.
Press "POWER" key or "POWER" button of remo-con once at Then adjustment code can be changed by "A, v keys.
anytime. Then set returns to normal state.


B. By Front Control Panel -Another Method


1. Before turning ON the set, press INPUT. Then press
TABLE 1 ADJUSTMENT CODE
POWER and keep pressing INPUT for about 3 seconds.


Afler 3 seconds, a small square will appear on the left
lower corner and there are two different displays. One
shows A and D, and the other P and D for
the picture adjustment.
A04 Input Level Adj. - 023
A05 Stereo VCO Adj. - 011
A06 Stereo VCO Adi. - 024
- - D = Data value
P 00 Picture Adj. Key Code
P 01 PIP Color Adj. - 027 P = Picture
P 02 PIP Tint Adj. - 036 A = Audio




8
1 A3LXU4
3. Since this adjustment is by control panel, the P
and D has a value of zero. For the adjustment Adjustment Preparation
mode, first you have to input a data value of 30 (1) Receive Color Bar or Circle Pattern Signal.
and then you can select the other P options.
(2) Connect a DC Voltmeter to point @.



The same for the other adjustment of A and D for



rl
I
A00
DO00
I
this
you
adjustment
can select
you need an input value
other options for A.
of 20 so




3. To make selection you have to use the arrow keys on front Adjustment Procedure
control panel. (1) Adjust LO10 so that the Voltmeter is 2.5 t 0.2V




CENTER FRONT
PANEL CONTROLS
,
INWT . VOL. VCHA Power
ovl 1
0000000 CORE POSITION
MENU EXIT 4 l v .
I t f
MENU i \ t $

CURSOR

I CORE
CORE



4-2. DEFLECTION CIRCUIT PICTURE ADJUSTMENT OPERATION
rr- Change Selection CHECK


4-2-l. Vertical Size Adjustment (R62A)

Decrease l Adjustment Preparation
c--Increase Data Value
Data Value (1) Receive Circle Pattern Signal.
G-9 Set "CONTRAST" to maximum and "BRIGHTNESS" to
the center.
-Change Selection (Down)
Adjustment Procedure
Match front panel control cursor to remote control cursor.
(1) Adjust Vertical Size Adjustment VR (R62A) so that the
inner circle of Circle Pattern comes in contact with the top
and bottom of the screen.

4. ADJUSTMENT PROCEDURE
4-2-2. Side Pin Distortion Coarse Adjustment (R752)
Adjustment Preparation
4-1 VCO For OSD Adjustment,
(1) Receive Circle Pattern Signal.
This chassis starts in initial turn ON and AUTO demonstration