Sanyo 28H1, Service Manual

SERVICE ADJUSTMENTS

[After replacing the Menory IC (IC802)]

The memory IC, IC802, stores the service adjustments data for each circuit, therefore, when the memory IC is
replaced, it should be readjusted the following adjustments and confirmed initial data value, refer to the adjustment
table on next page.

Adjustments

Service Mode

Stereo separation adjustment   

Item 000, Item 001

Vertical Centring 

Item 005

Vertical Height

Item 006

Horizontal Centring 

Item 009

Horizontal Width 

Item 010

White Balance

Item 034, Item 035

DCS Gain Item 

057

Auto Setup Option setting 

Item 069

Enter to the Service Mode

■

Press and hold the Function button on the RC handset and then press the Prog + button on the TV set.

+ To select the adjustment item, use the Prog+ or Prog- button. The selected item is indicated in red.
+ To change the service data, use the Level - or Level + button.
+ The data which is set in the service mode is stored into the memory IC automatically.

Exit from the Service Mode

■

Turn off the TV set by using the Mains switch.

ADJUST   DATA

+000 K1 

+001

+001 K2

-006

+003 STID

+000

ADJUST   DATA

+000 K1 

+001

+001 K2

-006

+003 STID

+000

Item

service data

Note: Some items of the service adjustments for this chassis are controlled by the CPU, IC801, and the
adjustments are carried out by using the RC handset.

-10-

Adjust. items Initial value

Status

Description

+000

K1

+000

ADJSTBL

Signal level adjustment for A2 stereo, 500mVrms at 54% dev. on pin 1 of SCART 1

+001

K2

-006

ADJSTBL

Separation adjustment for A2 stereo, minimise R signal on pin 3 of SCART 1

+002

STID

+000

Fixed

Judgement algolizum for A2 stereo, 0: FAST  1:NORMAL  2:FAST -> NORMAL

+003

ATT

+004

Fixed

Sound level adjustment between A2 stereo and NICAM stereo decoded output

+004

VFreq

+130

Fixed

Not used

+005

VCent

+086

ADJSTBL

Vertical centre adjustment for 50Hz

+006

VSize

+028

ADJSTBL

Vertical size adjustment for 50Hz

+007

SCore

+010

RECOMD

Vertical linearity adjustment (centre, top/bottom part), common data of 50/60Hz

+008

VLner

+009

RECOMD

Vertical linearity adjustment (top and bottom part), common data of 50/60Hz

+009

HCent

+175

ADJSTBL

Horizontal centre adjustment for 50Hz

+010

HSize

+032

ADJSTBL

Horizontal width adjustment for 50Hz

+011

PinAmp

+023

RECOMD

Horizontal pincushion adjustment for 50Hz

+012

Tilt

+022

RECOMD

Trapezoid distortion correction adjustment for 50Hz

+013

UCoPin

+010

RECOMD

Upper corner pincushion adjustment, common data of 50/60Hz

+014

LCoPin

+010

RECOMD

Lower corner pincushion adjustment, common data of 50/60Hz

+015

VBow

+011

RECOMD

Vertical line correction adjustment, common data of 50/60Hz

+016

VAngle

+007

RECOMD

Parallelogram distortion correction adjustment for 50Hz

+017

HVCmpV

+007

Fixed

Vertical size correction due to beam current, common data of 50Hz/60Hz

+018

HVCmpH

+007

Fixed

Horizontal width correction due to beam current, common data of 50/60Hz

+019

VFreq60

+000

Fixed

Setting of vertical osc. frequency for 60Hz (Not used)

+020

VCent60

-002

Fixed

Vertical centre adjustment for 60Hz (difference to ITEM 5)

+021

VC16950

+000

Fixed

Vertical centre adjustment on 16:9 mode for 50Hz (difference to ITEM 5)+00

+022

VC16960

+000

Fixed

Vertical centre adjustment on 16:9 mode for 60Hz (difference to ITEM 5)

+023

VSize60

+000

Fixed

Vertical size adjustment for 60Hz (difference to ITEM 6)

+024

VS16950

+000

Fixed

Vertical size adjustment on 16:9 mode for 50Hz (difference to ITEM 6)

+025

HCent60

+003

Fixed

Horizontal centre adjustment for 60Hz (difference to ITEM 9)

+026

HCentTX

-010

Fixed

Horizontal centre adjustment on teletext mode (difference to ITEM 9)

+027

HSize60

+002

Fixed

Horizontal width adjustment for 60Hz (difference to ITEM 10)

+028

PinAmp60

+001

Fixed

Horizontal pincushion adjustment for 60Hz (difference to ITEM11)

+029

Tilt60

+003

Fixed

Trapezoid distortion correction for 60Hz (difference to ITEM12)

+030

Colour

+023

Fixed

Sub colour setting

+031

TintAN

+069

Fixed

Tint setting for AN5390

+032

Cont

+027

Fixed

Sub contrast setting

+033

Bright

+022

Fixed

Sub brightness setting

+034

DriveR

+152

ADJSTBL

R-drive adjustment of white-balance

+035

DriveB

+160

ADJSTBL

B-drive adjustment of white-balance

+036

CutofG

+050

RECOMD

G-cut off adjustment of white-balance

+037

CutofR

+063

RECOMD

R-cut off adjustment of white-balance

+038

CutofB

+042

RECOMD

B-cut off adjustment of white-balance

+039

BYGinPA

+035

Fixed

B-Y gain setting (PAL)

+040

RYAnglPA

+000

Fixed

R-Y angle setting (PAL)

+041

MatrxPA

+003

Fixed

G-Y matrix ratio setting (PAL)

+042

BYGinNT

+037

Fixed

B-Y gain setting (NTSC)

+043

RYAnglNT

+000

Fixed

R-Y angle setting (NTSC)

+044

MatrxNT

+002

Fixed

G-Y matrix ratio setting (NTSC)

+045

BYGinSE

+037

Fixed

B-Y gain setting (SECAM)

+046

RYAnglSE

+000

Fixed

R-Y angle setting (SECAM)

+047

MatrxSE

+002

Fixed

G-Y matrix ratio setting (SECAM)

+048

TintSW

+009

Fixed

Tint setting fro AN5390

+049

ABLACL*

+000

Fixed

ABL/ACL defeat switch and other setting

+050

Black

+104

Fixed

Setting of operational point and gain for black expansion function

+051

Gamma

+240

Fixed

Setting of gamma compensation (o: minimum, 240: maximum)

+052

White

+032

Fixed

Setting of slice level for white peak and adder value to B signal

+053

ABL

+095

Fixed

Setting of ABL operational point and gain

+054

ACL

+207

Fixed

Setting of ACL operational point and gain

+055

VMGain

+012

Fixed

Gain setting of VM

+056

SW12

+000

Fixed

Y/C delay value setting for AN5390

+057

DCSGain

+220

ADJSTBL

Gain setting of DSC

+058

Sharp

+004

Fixed

Sub sharpness adjustment

+059

DGain

+120

Fixed

Sharpness setting of small signal part

+060

DCore

+125

Fixed

Coring setting of Dgain

+061

DC000

Fixed

Change Dcore value according to TDA9143 noise detection (0: No correction)

+062

Sepetn

+100

Fixed

Setting of Dgain and aperture control value

Adjustment Items and data Table

+063

Xtal

+002

Fixed

X’tal setting, 0:3.58+3.58, 1:3.58, 2:4.43, 3:4.43+3.58

+064

System

+224

Fixed

Sub address setting 01 of TDA9134

+065

TintTDA

+016

Fixed

Tint setting of TDA9143

+066

YDelyPA

+010

Fixed

Y/C phase setting for PAL (sub address setting 18 of TDA9143)

+067

YDelyNT

+010

Fixed

Y/C phase setting for NTSC (sub address setting 18 of TDA9143)

+068

YDelySE

+010

Fixed

Y/C phase setting for SECAM (sub address setting 18 of TDA9143)

+069

Country

+001

ADJSTBL

0: auto search   1: ATS

+070

WideOpt

+001

Fixed

0: 16:9 mode off   1: 16:9 mode on

+071

TxBrit

+040

Fixed

Black level setting of teletext mode

+072

TxCont

+062

Fixed

Contrast setting of teletext

Notes:
+ The initial value that the CPU writes down the CPU ROM data to the memory when replaced the memory IC. TV

set does not operate correctly with this initial value. 

+ The items which are shown with “fixed” in the status column in the table above are preset by factory as standard.

So do not change value otherwise the set may not operate properly.

+ The items which are shown with “RECOMD” are normally not requied for re-adjustment but it may change the value

to implove the performance.

+ The items which are shown with “ADJSTBL” should be re-adjusted following steps.

STEREO SEPARATION ADJUSTMENT
1. Enter to the service mode.
2. Select item 000 and set data to “+000“, select item 001

and set data to “-006“.

VERTICAL CENTRING ADJUSTMENT
1. Receive circular pattern.
2. Enter to the service mode.
3. Select Item 5 and adjust the vertical centre.

VERTICAL HEIGHT ADJUSTMENT
1. Receive circular pattern.
2. Enter to the service mode.
3. Select Item 6 and adjust the vertical height.

HORIZONTAL CENTRING ADJUSTMENT
1. Receive circular pattern.
2. Enter to the service mode.
3. Select Item 9 and adjust the horizontal centre.

HORIZONTAL WIDTH ADJUSTMENT
1. Receive circular pattern.
2. Enter to the service mode.
3. Select Item 10 and adjust the horizontal width.

WHITE BALANCE ADJUSTMENT
1. Receive white pattern.
2. Enter to the service mode.
3. Adjust white balance using the following items,

Item 034  R drive adjustment
Item 035  B drive adjustment

DCS GAIN ADJUSTMENT
1. Enter to the service mode.
2. Select item 059 and set data to “100”.

AUTO SETUP OPTION SETTING
1. Enter to the service mode.
2. Select item 057 and set data as follows;

Value +000 : Auto search mode for UK and Ireland
Value +001 : ATS mode for W. Europe countries.

SERVICE ADJUSTMENTS-1

After replacing  the memory IC, IC802,  folllowing service adjustments must be carried out.

VCO ADJUSTMENT
1. Receive the circular pattern.
2. Adjust the picture to obtain the best picture by using

T103.

B1 POWER SUPPLY ADJUSTMENT
1. Set VR641 to be mechanical centre before pressing

the main switch.

2. Receive the circular pattern.
3. Set brightness and contrast controls to normal.
4. Connect digital V-meter to “TP453” on the sub/def.

board.

5. Adjust voltage to be 137±0.5V

DC

by using VR641 on

the sub/def. board.

AFT ADJUSTMENT
1. Receive the clearest station. 
2.  Adjust AFT to obtain the best picture by using T102.

AGC ADJUSTMENT
NOTE: 

Do not attempt this adjustment with weak

signal.

1. Receive the clearest station.

2. Set AGC VR(VR101) in direction which causes snow

noise to appear, then in the opposite direction until
snow noise just disappears.

FM DETECTOR ADJUSTMENT(UK/Ireland only)
1. Receive the monaural station of system I.
2. Connect voltmetre between TPC and TPE.
3. Adjust the voltage to be 6.0±0.2V

DC

by using T101.

PILOT ADJUSTMENT(Europe only)
1. Receive the A2 stereo signal

Carrier 

:5.5MHz + 5.74MHz

Deviation :27kHz

2. Connect oscilloscope between TP34A(pin 5 of IC3401)

and TP34E.

3. Adjust the amplitude to be maximum by using T3401.

VIDEO AMPLITUDE  ADJUSTMENT(Europe only)
1. Receive the PAL colour bar pattern.
2. Connect oscilloscope between ) and

JT1201E(-) on the back board.

3. Adjust the video amplitude to be 1.0Vp-p±0.05V by

using VR1201 on the back board.

DOUBLE SCAN ADJUSTMENT
Receive the PAL colour bar pattern. Adjustment points

are on the double scan borad.

[PLL ADJUSTMENT]
1. Connect oscilloscope between C7226-(TPOSC)(+)

and GND(-).

2. Adjust voltage to be 2.5V

DC

by using T7201.

[CLAMP ADJUSTMENT]
1. Connect voltmetre between pin 52 of ) and

pin 48 of IC7201(-).

2. Adjust voltage to be 2.0V

DC

by using VR7201.

[OUTPUT LEVEL ADJUSTMENT-Y]
1. Connect oscilloscope between pin 6 of K73C(+) and

GND(-).

2. Adjust the Y signal amplitude to be 0.7Vp-p by using

VR7351.

0.7Vp-p

2.5V

DC

DC=0

1.0Vp-p

100% white level

SERVICE ADJUSTMENTS-2

Please refer to the “Component Locations” for the adjustments and test points.

[OUTPUT LEVEL ADJUSTMENT-R-Y]
1. Connect oscilloscope between pin 10 of K73C(+) and

GND(-).

2. Adjust the R-Y signal amplitude to be 0.7Vp-p by using

VR7352.

[OUTPUT LEVEL ADJUSTMENT-B-Y]
1. Connect oscilloscope between pin 8 of K73C(+) and

GND(-).

2. Adjust the B-Y signal amplitude to be 0.7Vp-p by using

VR7353.

0.7Vp-p

0.7Vp-p

SCREEN ADJUSTMENT
1. Receive the PAL colour bar pattern.
2. Connect oscilloscope between ) and

JTP47E(-) on the CRT unit.

3. Adjust colour control to minimum, brightness to centre

and contrast to minimum.

4. Adjust the black level to be 165V

DC

±5V by using

SCREEN VR on the FBT.

HIGH VOLTAGE CONFIRMATION
1. Receive the white pattern.
2. Set brightness and contrast controls to maximum.
3. Connect digital V-meter between “TP451” and

“TP452”, and high voltage meter to CRT anode.

4. Confirm high voltage to be 28.5 ± 1 KV at beam

current 1.8, and less than 32.5 KV at 0 beam current.

FOCUS ADJUSTMENT
By using FOCUS VR, adjust focus control for well
defined scanning lines.

165V

DC

DC=0

Black level