Text preview for : 32FX42B.pdf part of Hitachi 36UX52B Hitachi Solid State Color Television Models:36UX52B/CZ77, 32UX51B/CY77, 36CX35B/CZ73, 36FX42B/CZ75, 32FX41B/CY75 Chassis: M7LXU Service Manual



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l-m No. 0080

36UX52BICZ77
32UX51 BlCY77
36CX35BKZ73
36FX42BlCZ75
32FX41 BlCY75

R/C: . CLU-431 UI
CLU-432U

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


This television receiver will display television
Closed Captioning (m or 0 ) in accordance
with paragraph 15.119 of the FCC rules.


TABLE OF CONTENTS
SAFETY PRECAUTIONS .................................................... 2 WIRING DRAWING OF 32UX51 B AND 32FX41 B
PRODUCT SAFETY NOTICE .............................................. 3 FINAL ASSEMBLY . .. .. .. .. .. . .. .. .. .. .. .. . .. .. .. .. .. .. .. .. .. .. . .. .. .. .. .. .. .. . 77
POWER SOURCE ............................................................... 3 PRINTED WIRING BOARD FOIL PATTERN
TECHNICAL SPECIFICATIONS .......................................... 4 (MAIN P.W.B.) . . .. .. .. .. .. .. .. .. . .. .. .. .. .. .. . .. .. .. .. .. .. .. .. . ... . .. .. .. .. .. .. .. . 79
TECHNICAL CAUTIONS ..................................................... 5 PRINTED WIRING BOARD FOIL PATTERN
ADJUSTMENT SPECIFICATIONS ...................................... 6 (POWER P.W.B., CONTROL P.W.B.,
WAVEFORMS AT EACH SECTION .................................. 36 SIDE PIN P.W.B., FILTER P.W.B.) .. .. .. .. .. .. .. .. .. .. . .. .. .. .. .. .. .. . 80
TROUBLESHOOTING FLOWCHARTS ............................. 40 CIRCUIT SCHEMATIC DIAGRAM M7LXU CHASSIS .. .. .. . 81
NOTES ............................................................................. 50 CIRCUIT SCHEMATIC DIAGRAM OF PINP . .. .. . .. .. .. .. .. .. .. . 90
REPLACEMENT PARTS LIST.. ......................................... 51 CIRCUIT SCHEMATIC DIAGRAM OF SRS . .. .. .. .. .. .. .. .. .. .. . 91
WIRING DRAWING OF 36UX52B AND 36FX42B CIRCUIT SCHEMATIC DIAGRAM OF
FINAL ASSEMBLY.. ........................................................... 75 3-LINE COMB FILTER .. ... . .. .. .. .. . .. .. .. .. .. . .. .. .. .. .. .. .. .. .. .. .. .. .. .. . 92
WIRING DRAWING OF 36CX35B
FINAL ASSEMBLY.. ........................................................... 76




SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT


SOLID STATE COLOR TELEVISION

JULY 1997 HHEA - MANUFACTURING DIVISION
M7LXU


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- Plug the AC line cord directly into an AC 120V 60Hz outlet
ture tube. (do not use an isolation transformer for this check). Turn
the AC power ON. Using a "leakage Current Tester
WARNING: Since the chassis of this receiver is connected
(Simpson's Model 229 or equivalent)", measure for current
to one side of the AC power supply during operation, when- from all exposed metal parts of the cabinet (antennas,
ever the receiver is plugged in, service should not be at-
screwheads, overlays, control shafts, etc.) particularly any
tempted by anyone unfamiliar with the precautions neces-
exposed metal part having a return path to the chassis or
sary when working on this type of receiver.
to a known earth ground (water pipe, conduit, etc.). Any
current measured must not exceed 0.5mA.
The following precautions should be observed:
1. Do not install, remove, or handle the picture tube in any



m
manner unless shatterproof goggles are worn. People
not so equipped should be kept away from the picture
tube while handling. (READING
SHOULD NOT
0 BE ABOVE
2. When service is required, an isolation transformer should LEAKAGE 0.5mA)
DEVICE
be inserted between power line and the receiver before CURRENT
UNDER `,TESTER J
any service is performed on a "HOT" chassis receiver. TEST `f -
I

3. When replacing a chassis in the receiver, all the protec- TEST ALL
EXPOSED METAL
tive devices must be put back in place, such as barri- SURFACES
ers, nonmetallic knobs, adjustment and compartment
cover-shields, isolation resistors, capacitors, etc. 2-WIRE CORD


4. When service is required, observe the original lead dress ALSO TEST WITH 6 d
in the high voltage circuitry area. PLUG REVERSED EARTH
(USING AC ADAPTER 4 GROUND
PLUG AS REQUIRED)
5. Always use the manufacturer's replacement compo-
nents. Critical components as indicated on the circuit
diagram should not be replaced by another
manufacturer's, Furthermore, where a short circuit has AC LEAKAGE TEST
occurred, replace those components that indicate evi-
dence of overheating.
ANY MEASUREMENTS NOT WITHIN THE LIMITS OUT-
6. Before returning a serviced receiver to the customer, the LINED ABOVE ARE INDICATIVE OF A POTENTIAL
service technician must thoroughly test the unit to be SHOCK HAZARD AND 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-
termined value. Comply with all notes described in this
Therefore, the following checks should be performed for Service Manual regarding this hold down circuit when ser-
the continued protection of the customer and service tech- vicing, so that this hold down circuit is operated correctly.
nician.
Serviceman Warning
Leakage Current Cold Check With minimum BRIGHTNESS and CONTRAST, the operat-
With the AC plug removed from the 12OV AC 60Hz source, ing high voltage in this receiver is lower than 35.0kV. Ir,
place a jumper across the two plug prongs. Turn the AC case any component having influence on the high voltage
power switch ON using an insulation tester (DC500V), con- is replaced, confirm that high voltage with minimum BRIGHT
nect one lead to the jumpered AC plug and touch the other NESS and CONTRAST is lower than 350kV. To measure
lead to each exposed metal part (antennas, screwheads, high voltage use a high impedance High Voltage Meter.
metal overlays, control shafts, etc.), particularly any exposed Connect (-) to chassis earth and (+) to the CPT Anode but-
metal part having a return path to the chassis should have ton (See the following connection diagram).
a minimum resistor reading of 0.24MQ and a maximum re-
sistor reading of 5.2MQ Any resistance value below or NOTE: Turn the power switch OFF without fail before the
above this range indicates an abnormality which requires connection to the Anode button is made.
corrective action. Exposed metal part not having a return
path to the chassis will indicate an open circuit.
2
M7LXU

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 tools,
tection afforded by them necessarily be obtained by using and have been trained to properly and safely repair com-
replacement components rated for higher voltage, wattage, plex products such as those covered by this manual. Im-
etc. Replacements parts which have these special safety properly performed repairs can adversely affect the product
characteristics are identified in this Model Service Manual. and its safety. Consumers should not risk trying to do the
necessary repairs and should instead refer to a qualified
Electrical components having such features are identified service technician.
with an A mark in the schematics and parts list in this Model
WARNING
Service Manual.
Lead in solder used in this product is listed by the California
Health and Welfare agency as a known reproductive toxi-
The use of a substitute replacement component which does
cant which may cause birth defects or other reproductive
not have the same safety characteristics as the HITACHI
harm
recommended replacement one, shown in the parts list in
(California Health and Safety Code, Section 25249.5).
this Model Service Manual, may create shock, fire, X-Ra-
diation, or other hazards.
When servicing or handling circuit boards and other compo-
nents with lead in solder, avoid unprotected skin contact with
Production Safety is continuously under review and new in-
the solder. Also, when soldering do not inhale any smoke or
structions are issued from time to time. For the latest infor-
fumes produced.
mation, always consult the current HITACHI Service Manual.
A subscription to, or additional copies of HITACHI Service
Manual may be obtained at a nominal charge from HITACHI
SALES CORPORATION. SAFETY NOTICE
USE ISOLATION TRANSFORMER
WHEN SERVICING
CPT ANODE
\
Components having special safety characteristics are iden-
tified by A on the parts list in this Model Service Manual
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 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 120 Volts/
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 OTHERTHANTHE
SPECIFIED VOLTAGE OR TO DIRECT CURRENT.
When troubleshooting and making test measurements in a
receiver with an excessive high voltage problem, avoid com-
ing unnecessarily close to the picture tube and the high volt-
age component.

Do not operate the chassis longer than is necessary to lo-
cate the cause of the excessive voltage.
M7LXU


TECHNICAL SPECIFICATIONS

POWER RATINGS
36FX42B/CZ75.. ..................... 190 Max. Watts
32FX41 B/CY75 ....................... 176 Max. Watts
36UX52B/CZ77 ...................... 193 Max. Watts
32UX51 B/CY77 ...................... 177 Max. Watts
36CX35B/CZ73 ...................... 174 Max. Watts


COLOR PICTURE TUBE
36FX42B/CZ75 ....................... ASOAHH50XOl
32FX41 B/CY75.. ..................... A80LJF30X (W)
36UX52BlCZ77 ...................... ASOAHH50XOl
32UX51 B/CY77 ...................... A80LJF30X (W)
36CX35B/CZ73 ...................... ASOAFX 15X0 1



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




F90f


The rating of fuse F901 is 6.OA-125V.
Replace with the same type fuse for continued protection against fire.




4
1 M7LXU

TECHNICAL CAUTIONS

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

Adiustment Preparation
1. Connect a High Voltage Voltmeter between CPT Anode terminal (Anode capside) and Ground.
2. Set the AC input voltage to 120 k3V.
3. Receive Circle Pattern or Broadcast Signal and set "BRIGHTNESS" and "CONTRAST" to maximum. Adjust the
SCREEN VR so that Beam Current is IS + 0.1 mA. (The voltage at ABL terminal (C747) should be l2V or less,)



High VoltageVFltmeter
+ (DC Voltage Divider)
CPT Anode
Use the voltmeterwhichcan
indicateup to thefirst decimal
point with an impedance of
1OMn or more.

I\ +
+ *


-a
-
cy
- DigitalVoltmeter

CPT Ground Wire




Adjustment Procedure
1. Check that the normal High Voltage and +B Voltage as below.

I CHASSIS IEHTI~-IKvIIB-~o.I~AI +B I

cz77 I cz75 I cz73 30.OKV 1.80mA 130 f.3V
CY77 I CY75 29.6KV 1 SOmA 130 +.3v



CPT Anode
CPT
1
High VoltageVoltmeter
(DC Voltage Divider)




--e
- Digital
Voltmeter



Use the voltmeterimpedance1OMRor more withindication the first decimalplace.
to



2. Connect a lOKS1 1/8W resistor to both ends of D708 and check that power is turned off.

D708
R736
+56V 0
> To D707
t



1 OkG2 1/8W Resistor


3. Disconnect the AC plug and remove the 10kQ resistor.



5
M7LXU

ADJUSTMENT SPECIFICATIONS

M7LXU CHASSIS PAGE #

I. MAIN CHASSIS ADJUSTMENT .............................................................. .8
l.MultiMaster12CBusSystem ............................................................. .
2. Adjustment Procedure-Start Up ......................................................... .8
2-l How to Get to Adjustment mode ..................................................... .8
2-2 Changing Data and Adjustment Code ................................................. .8
3. Adjustment Mode ..................................................................... .
4.AdjustmentProcedure ............................................................... ..9
4-l Adjusting MI-CON clock ........................................................... .9
4-2 IFAdjustment ........................................ ..".....~.......~..........I 0
4-2-l PIF/AFC Adjustment (Except 36CX35B/CZ73) .................................... IO
4-2-2 Adjustment of IF Waveform (Except 36CX35BICZ73) ............................... 10
4-2-3 VCO for OSD Adjustment .................................................... 11
4-3 PinPAdjustment.................................................................l I
4-3-l Color amplitude ........................................................... 1I
4-3-2 Yamplitude .................................................... ..~.~.....I I
4-4 MTSAdjustment.................................................................l I
4-4-l Input Level Adjustment ..................................................... 11
4-5 Stereo VCO Adjustment ........................................................... 12
4-6 FilterAdjustment .............................................................. ..I 2
4-7 SeparationAdjustment .......................................................... ..I 2
4-8 SAPVCO Adjustment ............................................................. 13
4-9 Cut-off Adjustment (Picture Adjustment) ............................................... 13
4-l 0 Deflection Circuit Picture Adjustment .................................................. 13
4-l O-l Horizontal Center Adjustment ................................................ 13
4-10-2 Vertical Size Adjustment ..................................................... 13
4-l O-3 Side Pin Distortion Adjustment (R777) .......................................... 13
4-l O-4 Horizontal Size Adjustment (R755) ............................................. 13
4-l I White Balance Adjustment ......................................................... 14
4-12 Sub Black Level Adjustment ........................................................ 14
4-13 AGC Adjustment For Sub Video (Except 36CX35BKZ73) .................................. 14
4-14 SubTintAdjustment ........................................................ .."...I 5
4-15 Sub Sharpness Adjustment ......................................................... 15
4-16 Sub Color Adjustment ............................................................. 15
4-17 PinP Position Adjustment .......................................................... 15
4-18 PinP Tint Adjustment .............................................................. 15
4-19 PinP Sharp Adjustment ............................................................ 15

II. FUNCTIONSETTING ............ ..~~...~................................................15
1. How to Set Memory Switch Setting Mode ................................................ .I5
2. ExplanationofFunctions ............................................................ ..I 5

Ill. MEMORYINITIALIZE.. ................................................................. .I6
I. TimerSoundOperationCheck ......................................................... .I6

IV. OPERATION CHECK ................................................................... .I6
1. AFCOperationCheck ............................................................... ..I 6
2. Channel Selection Circuit Operation Check ............................................... .I6
2-l Channel UP/DOWN Selection ....................................................... 16
2-2 ChannelUP/DOWN .............................................................. 17
2-3 Volume UP/DOWN.. ............................................................. 18
2-4 PowerON/OFF ................................................................. 18
2-5 Input ......................................................................... 18
2-6 Menu.. ....................................................................... 18
2-7 Menu Mode (using Remo-Con) ..................................................... 18
2-7-l SetUpMode ............................................................. 18
2-7-2 Program Mode ........................................................... 19


6
M7LXU

2-7-3 Clock Mode (clock operation check) ............................................ 20
2-7-4 Picture Mode ............................................................. 20
2-7-5 Sound Mode ............................................................. 21
2-7-6 Auto LinkMode ........................................................... 22

V. DEFLECTION CIRCUIT PICTURE ADJUSTMENT OPERATION CHECK ............................. 22
1. M7LXU Chassis High Voltage Limiter Circuit Operation Check
and Overvoltage Protection Circuit Operation Check ........................................ 22
2. FBT Protection Circuit Operation Check .................................................. 23
3. Check +18v Short Protection Circuit ..................................................... 23
4. Check +14v Short Circuit Protection Circuit ............................................... 23
5. Load Short Protection Circuit Operation Check ............................................ .24
6. WeakElectricFielcl Check ............................................................. 24

VI. REMO-CON OPERATION CHECK .......................................................... 24
1. DirectChannelSelection .............................................................. 24
2. LST-CH Last Channel Recall ........................................................... 24
3. Mute .............................................................................. 24
4. Recall ............................................................................. 24
5. PinP .............................................................................. 24
6. Move .............................................................................. 24
7. Swap .............................................................................. 25
8. Freeze ............................................................................. 25
9. PinP CH (Except 36CX35B) ............................................................ 25

VII. MEMORY INITIALIZE (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , 25

VIILFINAL ASSEMBLY ADJUSTMENT/COMMON SERVICE ADJUSTMENT ............................. 25
1. Purity Convergence Adjustment ........................................................ 25
1-i Preparation for Adjustment ........................................................ 25
l-2 Purity Adjustment by using Microscope ............................................... 25
l-3 Purity Adjustment by Hand Operation ................................................. 28
I-4 Static Convergence Adjustment ...................................................... 30
1-5 Dynamic Convergence Adjustment ................................................... 31
2. FocusAdjustment ................................................................... 31

IX. MATCHING CHECK WITH OTHER INSTRUMENTS ............................................. 32
1. Video 1 InputTerminal Matching Check .................................................. 32
2. Video2lnputTerminalMatchingCheck .................................................. 32
3. Video 3 Input Terminal Matching Check .................................................. 32
4. S-IN Input Terminal Matching Check ..................................................... 32
5. Audio Output Level Check ............................................................. 32

X. SAFETYCHECK ....................................................................... 32
l.PolarityCheck ....................................................................... 32

Xl. MTS OPERATION CHECK ................................................................ 33
l.STEREO/SABroadcastReceivingCheck ................................................. 33
2. MTSModeCheck .................................................................... 33
3. STEREO Separation Check ............................................................ 33

XII. SETTING FOR DELIVERY . . . . . . . . . . . . . . . . . . . . . . . . . . . = . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

XIII. ADJUSTMENT POSITION LIST . . . m. . . . . . . . . . . . . . . . . . . . . I. . . m. . . , m. . . . . . . . . . . . . . . . . . m. . . . .35
n




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
M7lXU

I. MAIN CHASSIS ADJUSTMENT TABLE 1
Adjustment Code
1. Multi Master 1% Bus System Code Name Adjustment Mode Adjustment Data Item Remark
Sewice l


Made Dale



M7LXU Chassis uses 1% Bus control system. Fig. 1
shows this control system.

FIGURE 1
(SLAVE)
If
IW.2 1201 IPWI
EEPROM IF/VlDEOiCHROMA PINP
BEF CONTROL
(SLAVE)




I I



* Notfor 36CX35B model
** Only for UX models
*** Only for 36CX35Bmodel
**** Notfor UX models




1001 (Master) controls other ICs (slave). Adjustment
data is memorized in 1002 (EEPROM). 1001 reads this
data and controls other KS. * This data is an approximate service code data. Fine
Adjustment items applied in this chassis are shown in adjustment must be done using the specified test pro-
Table 1. cedure and adjustment tools.

2. ADJUSTMENT PROCEDURE-START UP 2-2 Changing Data and Adjustment Code
When the CTV set is in adjustment mode, the cursor
2-1 How to Get to Adjustment Mode " 4, ), A, v " and ENTER keys of the customers
Chassis adjustment can be done by using the front remo-con will be the adjustment keys.
control panel buttons with CTV set turned off. Press
"POWER" and "MENU" or "INPUT" keys at the same A. Use any Hitachi remote control with ENTER button
time, and hold more than 3 seconds. The CTV set as shown when making an adjustment.
turns on in adjustment mode with OSD as follows.


Hold 3 - 5 Set Hold More Than 5 Sec.
0 MENU

cl ENTER




"A, v " keys are used for changing adjustment
I A00
DO00

AUDIO Adjustment
--
0
PO0
DO00

PICTUREAdjustment
code.
" 4, ) " keys are used for changing data.
Mode Mode ENTER key is used for changing "Cut Off
A00 Adjustment Code (Refer to Table 1) Mode"/"Normal mode." (Refer to cut off adjust-
DO00 _ Adjustment Data ment)

"To Escape from Adjustment Mode" 3. ADJUSTMENT MODE
Press "POWER" button of remo-con or front panel If below display appears
once at anytime. Then set returns to normal state.




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

Set data "0020" at "AOO" or "D030" at "POO" by
" 4 , b " keys.
Then adjustment code can be changed by "AJ"
keys.
8
- Change Selection

l-7 A

B. By Front Control Panel-Another Method Decrease
t Increase Data Value
Data Value

1. Before turning ON the set, press and hold the
POWER button and INPUT button for about
L Change Selection (Down)
3 seconds.

2 After 3 seconds, a small square will appear in the Match front panel control cursor to remote control cursor.
left lower corner. There are two different displays,
depending upon how long the INPUT button is
pressed and held. One shows A and D for audio 4. ADJUSTMENT PROCEDURE
adjustment, and the other shows P and D for the 4-I Adjusting Mi-con clock
picture adjustment. Adiustment Preparation
(1) Initial setting of EEPROM (1002)
Add +I 2V to @ point and check @ point is
5VkO.3V
Note: Keep adding +I 2V more than 5 seconds.




3. To activate the adjustment mode, input a data value of
30 (D030), using the front panel cursor 4 ,F before
any of the picture adjustments can be adjusted. (2) Connect a frequency counter and a 12MHz
amplifier as follows.




The same for the audio adjustment. To activate the
audio adjustment, you need an input data value of 20
before any of the audio adjustments can be adjusted.

Adiustment Procedure
(1) This adjustment should be done at stand-by
mode.
4. To make a selection, you have to use the arrow keys (2) Adjust CT01 so that the frequency is
on front control panel. 12,000,000+1 OOHz.

(Other method)
Volume Channel
FRONT (1) Add +12V A point. (Same as 4-I (1))
YONTROLS `npuT;T; & ~ l_;
(2) Connect fre uency counter to lOOl@.
(31 Short 1001 ?I pin to GND.
52
(4) Adjust CT01 so that the clock outputted from
1001 @I pin is 166.666KHzk2Hz.
(5) This adjustment should be done at power on
I I I I
MENU2 mode.
`:rt
CURSOR




9
M7LXU

4-2 IF ADJUSTMENT 4-2-2 Adjustment of IF waveform
4-2-l PIF/AFC Adjustment (except for 36CX35BKZ73)
(except for 36CX35BKZ73) Adjustment Preparation
Adjustment Preparation (1) Connect signal as follows.
(1) Add +9V to pin @and +12V to pin @, @ of
PNH2 connector. 5os75i2

(2) Add IOOrt resistor between GND and U102 pin
CD.
(3) Input signal to X201 pin (I) as shown below.
f=l93.25 Mhz

Marks 0.2MHz
1 MHz Output level 75k5 dB p (50R load)
2 MHz I Modulation 90-70%
3.6MHz


(2) Connect the oscilloscope to Q201 0.
Check the signal at Q201 0 as follows.


A : Set up level 0.15v
r_______________________________________-------------~ B : Sweep Signal Level 0.5V
I C : Sync. level 0.29v
1




(3) Add the following voltage.
(a) +9V to pin @ of PNH2 connector base.
(b) +I 2V to pin @ and pin 0 of PNH2
connector base.
(4) Connect DC voltmeter (input impedance IM ohm (c) +56V to pin @ of PNSI connector base.
or more) to 1201 pin @. (d) Connect a 1 Ka resistor and a diode as
below.
Adiustment Procedure R065 IK R064
(1) Set adjustment code "PO1 ."
Change data so that the voltmeter is 1 SS270/1 S2076
2.5+O.W at 1201 pin @?. (e) Receive a color bar signal.

1201 @ Pin output Adjustment Procedure
(1) Adjuster IF coil (U102) so that the output level of
0.2MHz is reference level (100%) and 3.6MHz
level is 60%. (At that time, do not turn tuner IFT
coil more than 1 turn.)
1201 @ Pin
2.5v
Voltage




3FH 7FH
OOH

Data Adjustment point
0.2 I 2 3.6MHz
I

Check that 1 MHz-2MHz level is 70%-l 00%




10
M7LXU

4-2-3 VCO for OSD adjustment 4-3-2 Y amplitude
Adjustment Preparation Adiustment Preoaration
(1) Receive color bar or circle pattern signal.
(2) Connect a DC voltmemter to point 0.


point @




loo1 PgfL~ coo2
(2) After adjustment of color amplitude, connect
oscilloscope to pin @ of PIPA connector base.
(3) Select PinP adjustment code "P17."

Adiustment Procedure Adiustment Procedure
(1) Adjust LOO1 so that the votmeter is 2.5+0.2V (1) Change data so that the amplitude of main and
sub signal white peak level are the same.

SJ

2.w




ov


4-4 MTS ADJUSTMENT
4-4-l Input level Adjustment
Core Adiustment Preparation
Core
(1) Apply a signal to F/E UIOI (or UlOlA for
36CX35B/CZ73) IF output terminals of Main PWB
4-3 PinP ADJUSTMENT
using the circuit shown below. And connect the
4-3-l Color amplitude AGC terminal @of UIOI (UIOIA for
Adiustment PreDaration 36CX35B/CZ73) to GND with a IOOR resistor.
(1) Input red pattern signal to VIDEOl.
A Video signal 1

0.45v



0.29v
I (40 IRE) LA,



SYNC is=41.25MHz
IN
IF modulator output signal waveform
(Color bar or all white)
(2) Turn CTV set ON.
(3) Select PinP adjustment code, "Pi 8."
(4) Connect oscilloscope to pin @ of PfPA connec- Note : Video signal and Audio Signal
tor base. should be synchronized.


Adiustment Procedure
(1) Change data of "P18" so that the amplitude of
main and sub signal level are the same. - - Carrier 0


$ Sub


IF modulator out ut level and P/S
P=l05dBu ({Ofi termination)
S level; -3dB to P level
At this time, S/N ratio of F/E
video output is 45dB or less.



11
M7LXU

Sound modulation condition 4-6 Filter Adjustment
Noise reduction encoder: ON Adjustment PreDaration
Stereo signal
1 .R=O (L only), 300Hz, 30% modulation
(1) Set capacitor lOOpF/16V as shown as follows.
(see note)
(2) Apply the signal to IS01 pin @ with the circuit
shown as follows.
Z.R=O (L only), 3kHz, 30% modulation
(see note) F/E
- 1 RS21 + -
Monaural signal UlOl@ : r, I VW f l=i 0 IS01
3. Monaural, 400Hz, 100% modulation I +m
CS06
(PRE-EN Off) UP61A j sftf j RS26
SAP signal (For CZ73) ---I
4.SAP, 300Hz, 30% modulation (see note) 10Oj.~F/f 6V


(2) Connect AC vottmeter Vo to IS01 pin @.
Use the AC voltmeter of Matsushita made, model
VP-950C or equivalent.
(3) Apply +9V to 1201, IS01 (Refer to item 4-2-l(1))
(4) Same as item 4-l (1)
(5) Select adjustment code "A04" @I SG output signal spec.
0 Frequency
f=1573kHz (Sin wave)
Adjustment Procedure
0 Signal Level
(I) Select sound input @ and adjust the data "A04" V=l OOmVrms
to Vo=sig 450mVrms + 1OmVrms at IS01 pin @ .
(3) Connect an AC voltmeter or oscilloscope to IS01
4-5 Stereo VCO adjustment