Panasonic WV-BM1790CH Service Manual ▷ View online
规 格
电源：
１００ Ｖ － ２４０ Ｖ ＡＣ， ５０／６０ Ｈｚ
耗电：
约２７ Ｗ
屏幕尺寸：
显象管对角线尺寸为４４３ ｍｍ
实际可视对角线尺寸为４１３ ｍｍ
实际可视对角线尺寸为４１３ ｍｍ
水平分辨率：
中心为１０００电视线
视频输入：
１．０Ｖ［ｐ－ｐ］ 复合／７５
Ω
ＢＮＣ插口
（可选 １．０ Ｖ［ｐ－ｐ］ ＥＩＡ复合／７５
Ω
视频输出：
与输入环接且自动端接， ＢＮＣ 插口
水平扫描频率：
１５．６２５ ｋＨｚ （１５．７５ ｋＨｚ）
垂直扫描频率：
５０ Ｈｚ （６０ Ｈｚ）
扫描线性：
水平： 小于５ ％
垂直： 小于５ ％
垂直： 小于５ ％
扫描失真：
小于２ ％
过扫描：
约６ ％
使用环境湿度：
小于 ９０ ％
使用环境温度：
０℃至＋５０℃
尺寸：
４０６ ｍｍ （宽） × ３５４ ｍｍ （高） × ９８ ｍｍ （深）
重量：
１３．０ 公斤
所示尺寸和重量为约略值。
规格如有变更时恕不另行通知。
规格如有变更时恕不另行通知。
WV-BM1790CH
ORDER NO. AVS0110395C3
POWER
Video Monitor
WV-BM
1790
ON
OFF
V HOLD
BRIGHT
CONTRAST
监视器
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION:
TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER (OR BACK). NO USER
SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE
PERSONNEL.
TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER (OR BACK). NO USER
SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE
PERSONNEL.
This symbol warns the user that uninsulated voltage within
the unit may have sufficient magnitude to cause electric
shock. Therefore, it is dangerous to make any kind of contact
with any inside part of this unit.
the unit may have sufficient magnitude to cause electric
shock. Therefore, it is dangerous to make any kind of contact
with any inside part of this unit.
This symbol alerts the user that important literature concerning
the operation and maintenance of this has been included.
Therefore, it should be read carefully in order to avoid
any problems.
the operation and maintenance of this has been included.
Therefore, it should be read carefully in order to avoid
any problems.
T
here are special components used in this equipment which are important for safety. These parts are indicated
by the ”
Y
” mark on the schematic diagram and the replacement parts list. It is essential that these critical
parts should be replaced with manufacturer's specified parts to prevent X-radiation, shock, fire, or other hazards.
Do not modify the original design without permission of manufacture.
IMPORTANT SAFETY NOTICE
CONTENTS
Major Operating Controls and Their Functions
1
Adjustment Procedure
2
Location of Test Points and Adjusting Controls
5
Schematic Diagram
6
Conductor View
7
Exploded View
8
Replacement Parts List
9
– 1 –
– 2 –
1. Test Equipment Required
8
The following test equipments are required for adjustment
of the Video Monitor WV-BM1790CH.
8
Video Signal Generator (Monoscope Pattern signal,
Stairstep signal and Cross-hatch signal)
8
Frequency Counter
2. Disassembling Procedure for
Adjustment
8
Referring to Fig. 2-1, remove eight screws that secure the
Upper Cover and remove the Upper Cover.
Fig. 2-1
3. Connection and Setting Up for
Adjustment
3.1. Connection
8
The Fig. 3-1 shows the connecting diagram for adjustment
procedure of the WV-BM1790CH using the Video Signal
Generator.
Fig. 3-1
8
Connect the Video Output Connector of the Video Signal
Generator to the Video Input Connector of the WV-
BM1790CH.
8
Connect the probe of the Frequency Counter to desired
Test Point in each adjustment step.
ADJUSTMENT PROCEDURE
3.2. Setting Up
8
Set the Video Signal Generator so that it provides the
Monoscope Pattern signal.
3.3. Initial Position of the Switches and
Level Controls for Adjustment
Main Board
TV Standard Selector (SW201).....................CCIR position
CONTRAST (VR101) ............................Mechanical Center
BRIGHT (VR102) ..................................Mechanical Center
V-HOLD (VR201) ..................................Mechanical Center
H-HOLD (VR301) ..................................Mechanical Center
V-HEIGHT (VR202) ...............................Mechanical Center
SUB V-HEIGHT (VR205) ......................Mechanical Center
V-LIN (VR204) .......................................Mechanical Center
CRT Board
SUB BRIGHT (VR103) ..........................Mechanical Center
FOCUS (VR104) ..................................Mechanical Center
8
The adjustment should be done with this initial setting,
unless otherwise specified.
4. Adjustment Procedure
8
Refer to the Location of the Test Points and Adjusting
Controls on page 5.
(1). Sub-Brightness Coarse Adjustment
Test Point: Video Monitor Screen
Adjust:
VR201 (V-HOLD)
Main Board
VR301 (H-HOLD)
Main Board
VR101 (CONTRAST)
Main Board
VR103 (SUB BRIGHT)
CRT Board
8
Supply the Monoscope pattern signal to the Video Input
Connector.
8
Adjust VR201 to hold picture vertically.
8
Adjust VR301 to hold picture horizontally.
8
Turn the CONTRAST Control to fully clockwise.
8
Adjust VR103 so that the raster will just appear.
8
Turn the CONTRAST Control to its mechanical center
position.
Remove eight screws.
Upper Cover
WV-BM1790CH
Video Signal Generator
VIDEO IN