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VL-AX1S/H/E/EW/EX
ADJUSTING THE LCD CIRCUIT
* To make this adjustment, set the backlight switch to the "NORMAL" position.
(Wiring board diagram: Main Side B)
TL2804(VGL)
COMMON PULSE
1. VCO free-run adjustment
Test point
TL7800(AFC)
Mode
VCR AV input
Procedure
1) Input the white 100% signal to AV input.
2) Connect the digital voltmeter to TL7800, and adjust DC voltage value to the specified adjustment value with
VCR ADJ 32.
2.00 ± 0.1V
Adjustment
rating
Examples
• During E
• During DAC (IC4701) 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
VCR AV input
Procedure
1) Set the VCR ADJ 83/93/C0 to 00/77/00. (At this time, LCD can not be displayed.)
2) With the VCR ADJ 3D, adjust the output voltage of TL2800 and the DC voltage value of the digital voltmeter to
the specified adjustment values.
3) Similarly with the VCR ADJ 3E/3F, adjust the output voltage of TL2801/2802 and the DC voltage value of the
digital voltmeter to the specified adjustment values. (Same as Item (2))
4) Return the VCR ADJ 83/93/C0 to the initial value. (Initial value: C5/7F/28)
0.78V ± 10mV
Adjustment
rating
Examples
• During E
• During DAC (IC4701) replacement.
3. COMMON PULSE adjustment
Test point
TL2804(VGL)
Mode
VCR AV input
Procedure
1) Connect TL2803 to GND.
2) Set the VCR ADJ 93 to A0.
3) With VCR ADJ 29, adjust the output voltage of TL2804 and the DC voltage value of the digital voltmeter to the
specified adjustment values.
4) Return the VCR ADJ 93 to the initial value. (Initial value: 7F)
6.95V ± 50mV
Adjustment
rating
Examples
• During E
C404
TL3320
TL3322
TL403
TL5776
R520
R519
C513
R516
C515
TL416
R518
C516
TL417
R517
C514
TL8855
R537
TL4436
R2516
R2509
TL8861
R2512
TL5768
R2514
TL783
C2516
C2515
TL5756
R2589
R2592
R2590
C2548
C2546
TL5761
TL5760
TL5759
Q2510
TL5758
R2832
R2812
C2807
TL8840 T L8842 T L8841 T L8843
D2801
TL911
TL2804
R2814
Q2800
TL2811
R2811
R2605
R2617
R2610
TL2813
R2810
TL2812
C2808
C2551
TL2803
TL2814
R2825
R2831
TL2817
R2823
R2623
TL2818
R2818
TL1480
R2822
TL2816
TL2819
R2820
TL2815
TL1477
R2819
TL2820
R2824
TL1908
TL2825
TL1913
SC1401
TL1909
TL2834
TL2833
TL1475 T L1478
TL1481 T L1479
TL2800(R OUT)
TL2803
DAC full-scale
COMMON PULSE
2
PROM (IC705) replacement.
2
PROM (IC705) replacement.
2
PROM (IC705) replacement.
TL4440
IC501
TL7800
R509
C507
R526
C231
C202
C501
L501
TL5789
TL5790 T L5788
TL4405
TL4403
TL4404
C224
R205
TL5786
R2503
TL912
TL7801
R2505
C2501 C2510
C2513
C222
C5702
Q2502
TL5752
C5704
TL5778
C5703
Q2504
R2534
C5701
C239
IC2501
C210
C208
R235
Q2508
C2511
L2502
C2507
C2509
C2503
C204
TL2800
TL2801
TL2802
SC701
SC2501
TL1431 TL239TL245TL244TL243TL242TL241TL235TL240
TL2801(G OUT)
DAC full-scale
Adjustment procedure and connecting same as the VCR section.
Address
• During VIO ENG (IC4401) replacement.
• During VIO ENG (IC4401) replacement.
Address
• During DAC (IC4701) replacement.
28
TL7823
C226
C227
C228
C240
C235
TL908
TL4441
IC201
C215
C212
C211
C209
R251
R255
R257
TL7800(AFC)
TL234
TL4437
TL4438
VCO free-run
TL4439
TL233
TL202
TL201
R258
TL238
TL237
TL236
SC201
TL1420
TL2802(B OUT)
DAC full-scale
VCR ADJ 32
VCR ADJ 29(C)
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