Service manual
31
VL-SD20U
VL-FD1U
2. PCO D/A-C adjustment
Test point TL2407 Mode EE mode
Procedure 1) Connect the AVS cable and then connect it to the monitor (TO).
2) Call the adjustment mode (V-ADJ).
3) Set the address to "23", and call the data.
4) Vary the data with the FF and REW keys to set the signal appearing at TL2407 to 0.64Vp-p ± 0.05.
Examples • During E
2
PROM replacement. • During IC4401 replacement. • During IC1401 replacement.
0.64±0.05
ADJUSTING THE LCD CIRCUIT
* To make this adjustment, set the backlight switch to the "NORMAL" position.
C731
C739
C732
7
17 R744 R734
IC701
C724
C728
C726
C729
C721
C730
R719
TL714
C734
C715
R729
R722
R723
R720
TL70
TL
9
C7
3
R216
R976
D703
R975
C988
C942
C941
Q703
IC901
C940
C742
R971
R972
C939
R739
C741
R970
R728
R969
C932
R959 R960 R962 R966
R738
R958
R954
R9993
C931
R957
C933
R961
C934
R963
R964
R955
R733 C930
R9991C9919C9920
C740 R956 R953
R730
C9921
D971
R737
C9916
Q702
C9914
C745
R732
R742
IC902
R9983
C9913
R9982
R9986
R740
R9980
C9912
R9994
R9978
TL710
R741
R9969
C9909
R9966
R9967
R731
R9924R9992
TL1917
R735
TL913
C9908R9963
C9902
R9961
R5801
C738
R9965R9956
R9962
C9907
TL830
C9901
C9903
C9905
C9923
R9995
TL812
R5810
TL811
R5822
R9957
TL815
TL829
R5809
TL813
TL814
TL810
SC800
TL809
TL819
TL802
TL800
TL832
TL817
TL801
R5802
TL818
TL804
TL805
R5813
R5803
TL831
R5812
R5811
R5800
R5804
R5805
TL816
TL803
R5806
TL806
R5807
TL807
TL808
Q151
C168
R157
R5808
TL828
R5821
TL827
R5820
TL826
C167
R5819
TL825
R5818
TL824
R5817
R154
TL822
TL821
TL820
TL152
C163
R9953
C9904
C9906
C9900
R9952R9951
R9964
R9960
IC151
R9959
R9954
R9968
R9970
R9975
R9973
TL1018
R152
C164
C9915
R9981
R153
TL1019
TL1020
C9917
R9988
R9987
R155
TL1021
R9977
TL1022
R9990
C9922
R9979
R967
R965
R9985
TL1024
C936
R968
TL1023
R9984
R990
C935
C937
R991
C938
TL1007
C951
TL1006
TL1005
C952
TL1004
C953
TL1003
R994
TL1001
TL1002
R993
R995
TL100
R998
T
L
R996
C
T
L
TL1
0
IC152
TL103
7
TL1034
C152
TL1035
TL1032
C166
SC1001
TL1033
TL1029
TL1031TL1054
TL907
TL1053
TL1052
TL1051
TL1050
C165
TL1026
R151
TL1028
TL1025
C154
C153
C156C157
C158
C159
C160
C162 C161
TL151
P151
TL807
VCO free-run
403
R1410
C1403
5
C1405
8
R1452
Q1401
R
1401
C7843
R7852
TL1410
R4403
2
C4403
IC7800
C7844
C7838
L1402
C7839
R7845
R7846
R424
Q402
C416
Q401
C7842
R420
R7851
R7854
R422
R425
R427
R7855
R7841
C473
C472
R476
C474
R477 R478
0
8
R
414
L471
R210
C402
L401
R406
R474
C2800
R207
R473
R768
L2800
L2801
C408
C409
IC402
C2801
R7850
R7847
R2803
R7849R2804
R7853
TL2800
R7848
TL2801
C7841
IC2800
R7844
TL2802
C7840
FB7800
R745
R746
R748
TL4408
R7856
R7857
R215
L2804 C1804
C1810
C2810
C2807
R2802
R2801
L2803
R1818
R1801
R1803
TL1801
L1801
C2809
C2806
R2800
D1800
L2802
C766
Q704
C2808
C2805
C767
C1800
R770
C765
C2804
IC706
C2803
C2802
R408
C226
R201
C207
C201
C202
L201
TL203
TL4435
TL4441
C204
R211
TL204
TL214
TL211
TL212TL215TL213
R203
IC201
C216
R202
R204
2
06
0
9 C215 C217
TL205
C214
IC202
TL201TL202
FL703
C213
R769
TL1800
R1805
R1817
C1803
C1801
R1800
R1808
R1812
C1808
Q1800
R1810
Q1801
C1805
Q1802
R1804
R1807
R156
R1802
L151
R1819
R1811
R
R1815
TL2800
DAC full-scale
TL1801
COM-amplitude
TL2801
DAC full-scale
TL2802
DAC full-scale
Adjustment procedure and connecting same as the VCR section.
(Wiring board diagram: Main Side B)
(Wiring board diagram: Main Side A)
1. VCO free-run adjustment
Test point TL807 Address VCR ADJ 32
Mode CAM
Procedure 1) Change the VCR ADJ address 93 to DF.
2) Connect the Frequency counter to TL807 and adjust it to the specified with the VCR ADJ address 32.
3) Set the VCR ADJ address 93 to FF.
Note: When the LCD screen disappears during the data setting at the address 93, keep changing the data.
In this case, you can check the address and data by the OSD display of monitor output.
Adjustment 15.734kHz ± 100Hz
rating
Examples • During IC7702 (FLASH MEMORY) replacement. • During IC4401 replacement.
2. DAC full-scale adjustment
Test point TL2800 (R OUT), TL2801 (G OUT), TL2802 (B OUT)
Address VCR ADJ 3D (R), VCR ADJ 3E (G), VCR ADJ 3F (B)
Mode CAM
Procedure 1) Output the picture to the monitor in the CAM mode.
(While adjusting, no picture appears on the LCD screen. Check the address and data by the OSD display of
monitor output.)
2) Change the VCR ADJ addresses 83, C0 and 93 to 00, 00 and 77, respectively.
3) Adjust the output voltage of TL2800 with the VCR ADJ address 3D and the DC voltage with a digital voltmeter
to the adjustment standard value. At this time, adjust them so that the average of both TP voltage values
corresponds to the standard center value.
4) Adjust the output voltage of TL2801/TL2802 with the VCR ADJ address 3E/3F and the DC voltage with a
digital voltmeter to the adjustment standard value. (The same as (2))
5) Set all the data of changed addresses to FF.
Adjustment 0.780Vp-p ± 10mVDC
rating
Examples • During IC7702 (FLASH MEMORY) replacement. • During IC4401 replacement.