Sanyo 28H1 Service Manual page 80

SERVICE ADJUSTMENTS
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.
[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.
ADJUST DATA
+000 K1 +001
+001 K2 -006
+003 STID +000
Item
+ 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.
Adjustment Items and data Table
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 DCoreSNR +000 Fixed Change Dcore value according to TDA9143 noise detection (0: No correction)
+062 Sepetn +100 Fixed Setting of Dgain and aperture control value
+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.
ADJUST DATA
service data
+000 K1 +001
+001 K2 -006
+003 STID +000
-10-
SERVICE ADJUSTMENTS-1
After replacing the memory IC, IC802, folllowing service adjustments must be carried out.
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.
SERVICE ADJUSTMENTS-2
Please refer to the "Component Locations" for the adjustments and test points.
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 by using VR641 on
DC
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 by using T101.
DC
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.
[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.
0.7Vp-p
[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
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.
VIDEO AMPLITUDE ADJUSTMENT(Europe only)
1. Receive the PAL colour bar pattern.
2. Connect oscilloscope between JT1201(+) 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.
100% white level
1.0Vp-p
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 by using T7201.
DC
2.5V
DC
DC=0
[CLAMP ADJUSTMENT]
1. Connect voltmetre between pin 52 of IC7201(+) and
pin 48 of IC7201(-).
2. Adjust voltage to be 2.0V by using VR7201.
DC
[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
SCREEN ADJUSTMENT
1. Receive the PAL colour bar pattern.
2. Connect oscilloscope between JTP47G(+) 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 ±5V by using
DC
SCREEN VR on the FBT.
Black level
165V
DC
DC=0
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.