SAFETY PRECAUTIONS ...………………...…………….……………………………………………
PRODUCT SAFETY NOTICE …………...…………….………...……………...…………….………
REMOTE CONTROL UNIT ……………..………...…………….……………………………………
Before servicing this chassis, it is important that the service techician reads the " Safety Precaution "
and " Product Safety Notices " in this Service Manual.
2
2
3
GENERAL OPERATIONS GUIDE .………………...…………….……………………………………
CIRCUIT DESCRIPTION …………...…………….……………………………………………………
ADJUSTMENT INSTRUCTIONS ……………………...…………….…………………………………
REPLACEMENT PARTS LIST …………………...…………….………………………………………
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.
COLOR TELEVISION
4
5
6
12
MARCH 2005 Hitachi Consumer Products ( THAILAND ) , Ltd.
SAFTY PRECAUTIONS
WARNING: The following precautions should be
opserved.
1. Do not install , remove, or handle the picture tube in could produce X-radiation moderately in excess of de any manner unless shatter proof goggles are worn. sign levels. The high voltage must not, under any cir People not so equipped should be kept away while cumstances, exceed 32kV on the chassis.
picture tubes are handled. Keep picture tube away
from the body while handing.
2. When service is required, an isolation transformer receiver is the picture tube. The tube utilized for the
should be inserted between power line and theabove mentioned function in this chassis is specially
receiver before any service is performed on theconstructed to limit X - radiatuion.
chassis.For continued X-radiation protection, replace tube with
3. When replacing the chassis in the cabinet,ensure
all the protective devices are put back in place,such
as barriers, non - metallic knobs, adjustment or
compartment covers or shields, isolation resistors/Many electrical and mechanical parts in HITACHI
capacitors, etc.television receiver have special safety related
4. When service is required, observe the original leadevident from visual inspection, nor can be protection
dressing. Extra precaution should be taken to afforded by them necessarily be obtained by using
assure correct lead dressing in the high voltage
circuitry area. Particularly note the R. G. B. leadwattage, etc. Replacement parts which have these
dressing. Ensure they are dressed well away fromspecial safety characteristics are identified by marking
the horizontal scan and F.B.T. circuitry.with a on the schematics and replacement
5. Always use the manufacturer ' s replacement
component. Always replace original spacers and safety characteristics as the HITACHI recommended
maintain lead lengths. Especially critical componentsreplacement one, shown in the parts list in this Service
are indicated thus on the parts list and Manual, may create electrical shock, fire, X - radiation,
should not be replaced by other makes.
Furthermore, where a short circuit has occurred,
replace those components that indicate evidence ofProduct Safety is continuously under review and new
overheating.instructions are issued from time to time. For the latest
6. Before returning a serviced receiver to the customer, Manual. A subscription to ,or additional copies of
the service technician must thoroughly test the unit HITACHI Service Manuals may be obtained at a nominal
to be certain that it is completely safe to operate charge from your HITACHI sales offices.
without danger of electrical shock, and be sure that
no protective device built into the instrucment by the
manufacturer has became defective, or inadvertenly The line output stage can develop voltages in excess
damaged during servicing. Therefore, the following of 25 kV; if the E.H.T cap is required to be removed,
checks are recommended for the continued discharge the anode cap to chassis via a high value
protection of the customers and service techninians.resistor, prior to its removal from the tube.
HIGH VOLTAGE
High voltage should always be kept at the rated value
of the chassis and no higher. Operating at higher
voltages may cause a failure of the picture tube or high
voltage supply, and also, under certain circumstances
X-RADIATION
TUBES : The primary source of X - radiation in this
the same type as the original, HITACHI approved type.
PRODUCT SAFETY NOTICE
characteristics. These characteristics are often not
replacement components rated for higher voltage,
parts list in this Service Manual.The use of a substitute
replacement component which does not have the same
or other hazards.
information,always consult the current HITACHI Service
TUBE DISCHARGE
INSULATION
Insulation resistantce should not be less than 4.5 Mohm
at 500 VDC between the mains poles and any accessible
metal parts. Also, no flashover or breakdown should
occur during the dielectric strength test, applying 3.2kV
AC for two seconds between the main poles and
accessible metal parts.
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R
REMOTE CONTROL UNIT
19
16
10
11
2
1
6
7
5
17
18
14
4
8
9
12
3
15
13
19
16
20
10
11
2
1
6
7
5
17
18
14
4
9
8
12
3
15
13
Models without TeletextModels with Teletext
1.11.
POWER ON/OFF SWITCHDEFAULT
2.12.
INPUT SELECTORMUTE
3.13.
VOLUME UP/DOWNCHI/II (FOR NICAM/A2 MODELS)
4.14.
PROGRAMME UP/DOWNPROGRAMME SELECTOR (DIRECT KEY)
5.15.
RECALLCURSO
6.16.
SURROUND SOUNDRETURN
7.17.
MENUCOLOR SYSTEM
8.18.
TIMERSOUND SYSTEM
9.19.
PICTUREEQUALIZER
10.20
SOUNDT/TEXT FUNCTION KEY (T/TEXT MODELS ONLY)
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GENERAL OPERATIONS GUIDE
With this set, all adjustments/settings are performed by selecting from menu screens. Different menu screens and details
of adjustments/settings are shown below. To access the menu screen, press the button, then select the item by
pressing the up/down cursor buttonsand adjust by the left/right cursor buttons .
MENU
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BLOCK DIAGRAM
- 5 -
A
A
DJUSTMENT INSTRUCTIONS
HOW TO GO TO SERVICE MODE
1. How to go to adjustment mode no 001 ~ 022
Procedure
(1) Turn TV off by power switch on the TV set.
(2) Press " FUNCTION " button on the TV set and kept depress the button.
(3) Turn TV on by power switch on the TV set.
2. How to go to adjustment mode no 101 ~ 328
Procedure
(1) Set volume to be “0”.
(2) Press button on remote control to go to standby mode.
(3) Press “TV/VIDEO” button on the TV set, and kept depress the button.
(4) Press button on remote control to go to operation mode.
(5) TV will show service table,then please cancel to keep depress the "TV/VIDEO" button.
Note :1. Press the UP/DOWN cursor buttons
2. Adjust data by the left/right cursor buttons .
3. Press "RECALL" buttons to restore the data.
+B ADJUSTMENT
PREPARATIONPROCEDURES
1
AC input voltage 230 +
2Turns on the set and set the brightness and contrast+B voltage : TP902
to Max.(Signal : Philips Pattern)GND : TP901
3After 30 sec heat-run, check & adjust the +B voltage
FREE RUN FREQUENCY ADJUSTMENT
Receive a PAL-I monoscope signal on TV mode.
1
5V(50Hz)
PREPARATIONPROCEDURES
to select adjustment mode no.
1
1
djust R954 to obtain +B voltage as below
Select adjustment mode no. 1 and press "MENU" button
one time.
VIF-VCO FREE RUN FREQUENCY ADJUSTMENT
PREPARATIONPROCEDURES
Receive a PAL-I monoscope signal on TV mode.
1
Select adjustment mode no. 2 and press "MENU" button
1
one time.
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SOUND TRAP FREQUENCY ADJUSTMENT
A
PREPARATIONPROCEDURES
Receive a PAL-I monoscope signal on TV mode.
1
Select adjustment mode no. 3 and press "MENU" button
1
one time.
SECAM R-Y OFFSET ADJUSTMENT
PREPARATIONPROCEDURES
1Receive a secam color bar signal on Video 2.1Select adjustment mode no. 4.
2Connect oscilloscope probe to pin 5 of E701.2Adjust output level at pin 5 of E701 as indicated below
using service mode no. 4.
0 +
0.1 V
SECAM B-Y OFFSET ADJUSTMENT
PREPARATION
1Receive a secam color bar signal on Video 2.1
2Connect oscilloscope probe to pin 5 of E701.2
Select adjustment mode no. 5.
djust output level at pin 5 of E701 as indicated below
PROCEDURES
using service mode no. 5.
0.1 V
0 +
WHITE PEAK LEVEL ADJUSTMENT
PREPARATIONPROCEDURES
1Connect oscilloscope probe to pin 3 of E202 on CPT 1Adjust output level at pin 3 of E202 as indicated below
P.W.B with respect to ground.using service mode no. 15.
2Input PAL cross hatch signal to Video 2 terminal.