[. . . ] Before returning the set to the customer, always perform an AC leakage current check on the exposed metallic parts of the cabinet, such as terminals, screwheads, metal overlays, etc. to be sure that the set is safe to operate without the danger of electrical shock, Plug the AC line cord directly into a 120 V AC outlet. (Do not use a line isolation transformer during this check. ) Use an AC voltmeter with a sensitivity of 5000 ohms per volt (or more) as follows: Connect a 1500 ohms, 10 watt resistor, paralleled by a 0. 15 mfd, 150 VAC capacitor, between a known good earth ground (water pipe, conduit, etc. ) and the exposed metallic parts, one at a time. Measure the AC voltage across the 1500 ohms resistor and 0. 15 mfd capacitor combination. [. . . ] Rear B terminals (AUDIO/VIDEO B terminals) When the monitor B selector button at the front of the monitor is pressed, the audio and video signals from the component which is connected to these terminals can be monitored. Rear Y/C terminals (AUDIO/VIDEO Y/C terminals) When the monitor Y/C selector button at the front of the monitor is pressed, the audio and video signals from the component which is connected to these terminals can be monitored.
Y/C (Mini DIN 4 pin) terminal specification
4 2 4 2
IN OUT
3 1 3 1
Pin No. Supply power to the set and measuring instruments and allow to warm up for at least 30 minutes. Color analyzer Adjustment mode Over scan mode ADJUSTMENT ITEM
CHECK B+ VOLTAGE
TIMING PATTERN
PATTERN GENERATOR MONOSCOPE PATTERN
SETTING
VR LOCATION
ADJUSTMENT PROCEDURE
TEST POINT : D901(-) DIGITAL VOLT METER VALUE 38. 0 ± 0. 5 VDC.
HOLD DOWN VOLTAGE SETTING
PATTERN GENERATOR MONOSCOPE PATTERN
BRIGHT VR and CONTRAST VR TO MAX.
VR503
TEST POINT : ZD501(-) DIGITAL VOLT METER VALUE 8. 35 ± 0. 1 VDC.
FOCUS ADJUSTMENT
PATTERN GENERATOR MONOSCOPE PATTERN
BRIGHT VR and CONTRAST VR TO 75%. SHARPNESS VR TO MAX.
FTB FOCUS VR1 and VR2
Adjusting FBT Focus VR1, 2 make focus resolution of reach over 800TV lines, four corners must be aiso clear.
HORIZONTAL PHASE ADJUSTMENT
PATTERN GENERATOR MONOSCOPE PATTERN
BRIGHT VR , CONTRAST VR and SHARPNESS VR TO MAX. FACTRY PRESETTING
VR401
Adjusting VR401 horizontal phase make right and left of picture to <=1%.
HORIZONTAL SIZE ADJUSTMENT VERTICAL LINEARY ADJUSTMENT
PATTERN GENERATOR MONOSCOPE PATTERN
VR306
Adjusting VR306 make signal side of picture of scale at 1. 5 ± 0. 5 position.
PATTERN GENERATOR MONOSCOPE PATTERN
BRIGHT VR , CONTRAST VR and SHARPNESS VR TO MAX. FACTRY PRESETTING
VR302
Adjusting vertical linear control VR302 for equal spacing of lines between center extreme of scan [(Max-Min)/Average]<=10%.
VERTICAL CENTER ADJUSTMENT
PATTERN GENERATOR MONOSCOPE PATTERN
VR303
Adjusting vertical center control VR303 to <=1%.
VERTICAL SIZE ADJUSTMENT
PATTERN GENERATOR MONOSCOPE PATTERN
VR301
Adjusting vertical size control VR301 make signal side of scale is 1 ± 0. 3 position.
6
ADJUSTMENT ITEM
WHITE BALANCE ADJUSTMENT AT VMC-8618
TIMING PATTERN
PATTERN GENERATOR NO SIGNAL
SETTING
BRIGHT VR , CONTRAST VR and SHARPNESS VR TO MAX.
VR LOCATION
VR801, VR803, VR805, FBT FOCUS VR
ADJUSTMENT PROCEDURE
Adjust VR805 G-Bias to center. Adjust VR803 make Y value is 0. 298 ± 0. 015.
PATTERN GENERATOR FULL WHITE
VR804, VR802, Adjust VR501 make luminance with video BRIGHT VR , VR501 signal to 38 ~ 42 FL. CONTRAST VR Adjust VR804 make X value is 0. 281 ± and SHARPNESS 0. 015. Adjust VR803 make Y value is 0. 329 ± 0. 015.
WHITE BALANCE ADJUSTMENT AT VMC-8619P
PATTERN GENERATOR NO SIGNAL
PATTERN GENERATOR FULL WHITE
VR804, VR802, Adjust VR501 make luminance with video BRIGHT VR , VR501 signal to 38 ~ 42 FL. CONTRAST VR Adjust VR804 make X value is 0. 313 ± and SHARPNESS 0. 015. Adjust FBT screen VR make luminance without video signal is 1. 0 ~ 1. 5 FL.
LUMINANCE ADJUSTMENT
PATTERN GENERATOR NO SIGNAL
PATTERN GENERATOR WINDOWS PATTERN
Adjust VR501 make luminance is 38 ~ 42 FL.
PATTERN GENERATOR FULL WHITE
Adjust VR502 make luminance is 85 ± 3 FL. Adjust VR305 make V-Linearity of picture is in the best condition.
PINCUSHION ADJUSTMENT
VR305 PATTERN GENERATOR BRIGHT VR , CROSSHATCH PATTERN CONTRAST VR and SHARPNESS VR TO MAX.
7
The way of adjusting it which a color analyzer is not used for. ADJUSTMENT ITEM
WHITE BALANCE ADJUSTMENT and LUMINANCE ADJUSTMENT
TIMING PATTERN
PATTERN GENERATOR NO SIGNAL
SETTING
BRIGHT VR , CONTRAST VR and SHARPNESS VR TO MAX.
VR LOCATION
VR801, VR802, VR803, VR804, VR805, FBT SCREEN VR
ADJUSTMENT PROCEDURE
VR801, VR802, VR803, VR804 and VR805 is center position. Adjust the VR801, VR803 and FBT SCREEN VR to dark gray with screen.
PATTERN GENERATOR FULL WHITE
VR804, VR802, Adjust the VR802 and VR804 to white BRIGHT VR , VR501 gray with screen. CONTRAST VR Adjust the VR501 it makes the screen of and SHARPNESS the monitor proper brightness. VR TO MAX.
8
MAIN BOARD (Foil side)
11 12
13
10 789 6 5 4 3 2 1
VR401 H-PHASE
VR503 X-RAY
VR501 ABL
T502 VR303 V-CENTER IC202
1
VR306 H-SIZE IC301
1
VR304 PIN VR302 V-LIN VR301 V-SIZE
T902
Fig. 4
VR804 VR801 VR803 R-GAIN R-BAIS B-BAIS
VR805 VR802 Q804 G-BAIS B-GAIN Q802
LED101 S108
S107 S106
S102
S103
S105
S101 S104
Q806
FUNCTION BOARD (Foil side) VIDEO BOARD (Foil side) Fig. PARTS LIST
LOCATION 1 1 2 2 3 3 4 4 5 6 7 8 9 9 10 11 12 13 14 15 16 16 17 18 19 20 PARTS NO. Materials of Capacitors and Resistors are abbreviated as follows ; Resistors Capacitors MT-FILM Metallized Film Resistor MT-POLYEST MT-GLAZE Metallized Glaze Resistor MT-COMPO OXIDE-MT Oxide Metallized Film Resistor TA-SOLD AL-SOLID NP-ELECT OS-SOLID 2. 5.
Metallized Polyester Capacitor Metallized Composite Capacitor Tantalum Solid Capacitor Aluminum Solid Capacitor Non-Polarized Electrolytic Capacitor Aluminum Solid Capacitors with Organic Semiconductive Electrolytic Capacitor DL-ELECT Double Layered Electrolytic Capacitor Tolerance of Capacitor (10pF over) and Resistor are noted with follow symboles. F . . . . . . . . . . . . 1% G . . . . . . . . . . . . 2% J . . . . . . . . . . . . 5% K . . . . . . . . . . . . 10% M . . . . . . . . . . 20% N . . . . . . . . . . 30% Z . . . . . . . . . . +80% ~ -20% Capacitors P : pF U : µF Inductors MH : mH UH : µH N. S. P. [. . . ] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ]