37
VL-Z1U
2. Adjustment of DAC full scale (Main PWB)
Measurement point
TL6807(G OUT)
Address
VCR ADJ 094(G)
Mode
VCR AV input
Adjusting method
1) Set the data values at addresses 41E/086/41C and 410 to FF/80/77 and 00, respectively.
(The LED shows nothing.)
2) Set the data values at addresses 096/411 and 0A8 to 00/80 and 48, respectively.
3) Connect the digital voltmeter to TL6807 (G_OUT) and measure the DC voltage.
* The measured voltage is (DA_VG).
4) Set the data values at addresses 096 and 411 to 80 and 00, respectively.
5) At address 094, adjust the DC voltage to the adjustment rating.
6) Preset the data values at addresses 093 and 095 so that they are the same as the data value at address 094.
7) Reset the data at addresses 41E/086/096/41C/411/0A8 and 410. (Initial value: 00/C5/28/7F/28/
42 and 7D)
Adjustment rating
DA_VG + 0.35V
±
10mV
Examples
· Replacement of IC705, IC4401
4. Adjustment of LCD_ contrast (LCD PWB)
Measurement point
TL846(LCD_VG)
Address
VCR ADJ 7C3
Test signel
0.900V
Procedure
1) Set the data value at address 41E (GRYLEV) to BE. (100% white display)
2) Set the data value at address 41C (TESTSW2) to 77. (1H inverted STOP)
3) Connect the digital voltmeter to TL846 (LCD_VG), and at address 7C3 (CONTRAST), adjust the
DC voltage to the adjustment rating.
Adjustment rating
±
50mV
Examples
· Replacement of IC801, IC800
5. Adjustment of COM-Bias (with the unit settings complete)
Measurement point
LCD panel display surface
Address
VCR ADJ 7C9
Mode
VCR AV input
Adjusting method
1) Apply a 40% white signal to the AV input.
2) Set the illuminometer (TOPCON IM-3) on the LCD panel surface. (Cut off outside light.)
3) Minimize the ripple of the output waveform of the illuminometer.
Adjustment rating
Minimum value
Remarks
Make adjustment after five minutes or more of aging.
Examples
· Replacement of LCD panel · Replacement of IC800
6. Adjustment of W/B (with the unit settings complete)
Measurement point
LCD panel display surface
Address
VCR ADJ 41F, VCR ADJ 421
Mode
VCR AV input
Adjusting method
1) Apply a 40% white signal to the AV input.
2) Apply a 40% white signal to the standard monitor. Make adjustment so that the image on the LCD
becomes equivalent to the image on the standard monitor.
Remark
Standard monitor
Examples
· Replacement of LCD panel · Replacement of IC4401, IC705
Response time: 0.6 sec
3. Setteing of parameters (LCD PWB)
* Preset the following data.
Address
7C0 7C6 7C7 7CB
NTSC
49
00
40
40
PAL
49
00
40
40
Summary of Contents for Viewcam VL-Z1U
Page 26: ...26 VL Z1U 9 5 4 Diagram of greasing oiling locations ...
Page 57: ...57 VL Z1U M E M O ...
Page 58: ...59 58 VL Z1U VL Z1U 14 SCHEMATIC DIAGRAMS 14 1 OVERALL SCHEMATIC DIAGRAM ...
Page 90: ...121 A B C D E F G H I J 1 2 3 4 5 6 7 8 9 10 VL Z1U 14 33 HOLE SENSOR UNIT SCHEMATIC DIAGRAM ...
Page 107: ...140 VL Z1U M E M O ...
