SAMSUNG PG17HS9UADC Schematics

Manual
SERVICE
COLOR MONITOR CONTENTS
1. Precautions
2. Product Specifications
3. Disassembly & Reassembly
4. Alignment & Adjustments
6. Exploded View & Parts List
7. Electrical Parts List
8. Block Diagram
9. Wiring Diagram
10. Schematic Diagrams
COLOR MONITOR
PG17H*/PG17IS PG19LS/PG19LO/PG19HS/ PG19IS/PG19S*/PG19R* PG21**
Samsung Electronics Co., Ltd. August 1999. Printed in Korea Code No.: BH68-00227A
WARNINGS
1. For continued safety, do not attempt to modify the circuit board.
2. Disconnect the AC power before servicing.
3. When the chassis is operating, semiconductor heatsinks are potential shock hazards.
1-1-1 Servicing the High Voltage VR
and CRT :
WARNING:A high voltage VR replaced in the wrong
direction may cause excessive X-ray emissions.
Caution:
When replacing the high voltage adjustment VR, it must be fixed by a soldering iron after it is properly set.
1. When servicing the high voltage system, remove the static charge by connecting a 10 kohm resistor in series with an insulated wire (such as a test probe) between the chassis and the anode lead.
2. If the HV VR requires adjustment, (a) Replace the VR and adjust the high voltage to the specification. (b) Use a soldering iron to melt the adjustment cap on the HV VR to prevent any movement.
3. When troubleshooting a monitor with excessively HV, avoid being unnecessarily close to the monitor. Do not operate the monitor for longer than is necessary to locate the cause of excessive voltage.
4. High voltage should always be kept at the rated value, no higher. Only when high voltage is excessive are X-rays capable of penetrating the shell of the CRT, including the lead in glass material. Operation at high voltages may also cause failure of the CRT or high voltage circuitry.
5. When the HV regulator is operating properly, there is no possibility of an X-ray problem. Make sure the HV does not exceed its specified value and that it is regulating correctly.
6. The CRT is especially designed to prohibit X-ray emissions. To ensure continued X-ray protection, replace the CRT only with one that is the same or equivalent type as the original.
7. Handle the CRT only when wearing shatterproof goggles and after completely discharging the high voltage anode.
8. Do not lift the CRT by the neck.
1-1-2 Fire and Shock Hazard :
Before returning the monitor to the user, perform the following safety checks:
1. Inspect each lead dress to make certain that the leads are not pinched or that hardware is not lodged between the chassis and other metal parts in the monitor.
2. Inspect all protective devices such as nonmetallic control knobs, insulating materials, cabinet backs, adjustment and compartment covers or shields, isolation resistor-capacitor networks, mechanical insulators, etc.
3. Leakage Current Hot Check (Figure 1-1):
WARNING: Do not use an isolation transformer during
this test.
Use a leakage current tester or a metering system that complies with American National Standards Institute (
ANSI C101.1, Leakage Current for
Appliances), and Underwriters Laboratories (UL Publication UL1410, 59.7).
4. With the unit completely reassembled, plug the AC line cord directly into a 120V AC outlet. With the unitÕs AC switch first in the ON position and then OFF, measure the current between a known earth ground (metal water pipe, conduit, etc.) and all exposed metal parts, including: metal cabinets, screwheads and control shafts. The current measured should not exceed 0.5 milliamp. Reverse the power-plug prongs in the AC outlet and repeat the test.
Figure 1-1. Leakage Current Test Circuit
1-1-4 Product Safety Notices
Some electrical and mechanical parts have special safety-related characteristics which are often not evident from visual inspection. The protection they give may not be obtained by replacing them with components rated for higher voltage, wattage, etc. Parts that have special safety characteristics are identified by
on schematics and parts lists. A substitute replacement that does not have the same safety characteristics as the recommended replacement part might create shock, fire and / or other hazards. Product safety is under review continuously and new instructions are issued whenever appropriate.
Components identified by on schematics and parts lists must be sealed by a soldering iron after replacement and adjustment.
PG17**/PG19**/PG21** 1-1
1 Precautions
1-1 Safety Precautions
!
DEVICE UNDER TEST
TEST ALL
EXPOSED METAL
SURFACES
(READING SHOULD
NOT BE ABOVE 0.5mA)
LEAKAGE CURRENT
TESTER
2-WIRE CORD
ALSO TEST WITH
PLUG REVERSED (USING AC ADAPTER PLUG AS REQUIRED)
EARTH
GROUND
1. Servicing precautions are printed on the cabinet, and should be followed closely.
2. Always unplug the unitÕs AC power cord from the AC power source before attempting to: (a) remove or reinstall any component or assembly, (b) disconnect PCB plugs or connectors, (c) connect all test components in parallel with an electrolytic capacitor.
3. Some components are raised above the printed circuit board for safety. An insulation tube or tape is sometimes used. The internal wiring is sometimes clamped to prevent contact with thermally hot components. Reinstall all such elements to their original position.
4. After servicing, always check that the screws, components and wiring have been correctly reinstalled. Make sure that the area around the serviced part has not been damaged.
1. Immediately before handling any semiconductor components or assemblies, drain the electrostatic charge from your body by touching a known earth ground. Alternatively, wear a discharging wrist­strap device. To avoid a shock hazard, be sure to remove the wrist strap before applying power to the monitor.
2. After removing an ESD-equipped assembly, place it on a conductive surface such as aluminum foil to prevent accumulation of an electrostatic charge.
3. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESDs.
4. Use only a grounded-tip soldering iron to solder or desolder ESDs.
5. Use only an anti-static solder removal device. Some solder removal devices not classified as Òanti-staticÓ can generate electrical charges sufficient to damage ESDs.
5. Check the insulation between the blades of the AC plug and accessible conductive parts (examples: metal panels, input terminals and earphone jacks).
6. Insulation Checking Procedure: Disconnect the power cord from the AC source and turn the power switch ON. Connect an insulation resistance meter (500 V) to the blades of the AC plug.
The insulation resistance between each blade of the AC plug and accessible conductive parts (see above) should be greater than 1 megohm.
7. Never defeat any of the +B voltage interlocks. Do not apply AC power to the unit (or any of its assemblies) unless all solid-state heat sinks are correctly installed.
8. Always connect a test instrumentÕs ground lead to the instrument chassis ground before connecting the positive lead; always remove the instrumentÕs ground lead last.
6. Do not remove a replacement ESD from its protective package until you are ready to install it. Most replacement ESDs are packaged with leads that are electrically shorted together by conductive foam, aluminum foil or other conductive materials.
7. Immediately before removing the protective material from the leads of a replacement ESD, touch the protective material to the chassis or circuit assembly into which the device will be installed.
Caution: Be sure no power is applied to the
chassis or circuit and observe all other safety precautions.
8. Minimize body motions when handling unpackaged replacement ESDs. Motions such as brushing clothes together, or lifting your foot from a carpeted floor can generate enough static electricity to damage an ESD.
9. Indicates ESDs on the Schematic Diagram in this manual.
1 Precautions
1-2 PG17**/PG19**/PG21**
1-3 Electrostatically Sensitive Devices (ESD) Precautions
Some semiconductor (solid state) devices can be easily damaged by static electricity. Such components are commonly called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated circuits and some field­effect transistors. The following techniques will reduce the incidence of component damage caused by static electricity.
1-2 Servicing Precautions
WARNING1: First read the “Safety Precautions” section of this manual. If unforeseen circumstances
create conflict between the servicing precautions and safety precautions, always follow the safety precautions.
WARNING2: A high voltage VR replaced in the wrong direction may cause excessive X-ray
emissions.
WARNING3: An electrolytic capacitor installed with the wrong polarity might explode.
2 Product Specifications
2-1 Specifications
Picture Tube: 17-Inch (43 cm): 16-inch (40.6 cm) viewable, 19-Inch (48.2 cm): 18-inch (45.8 cm) viewable,
21-Inch (53 cm): 20-inch (50.8 cm) viewable, 17”/19”: 0.26 mm Dot pitch, 21”: 0.25 mm Dot pitch, Full-square flat-face tube, 90˚ Deflection, 100˚ Deflection (PG19S*, PG19R*), Anti-Reflection coating with Anti-electrastatic, Medium short persistence phosphor
Scanning Frequency Horizontal : PG17H*/PG19R*/PG19LS/PG21LS: 30 kHz to 96 kHz (Automatic), (Automatic) PG19HS/PG19S*: 30 kHz to 110 kHz (Automatic), PG21MS: 30 kHz to 115 kHz
Vertical : 50 Hz to 160 Hz (Automatic)
Display Colors Unlimited colors
Maximum Resolution Horizontal : 17”/19”/PG21LS: 1600 Dots, PG21MS: 1800 Dots
Vertical : 17”/19”/PG21LS: 1200 Lines, PG21MS: 1440 Dots
Input Video Signal Analog, 0.7 Vp-p positive at 75 , internally terminated
Input Sync Signal Separate Sync : TTL level positive/negative
Composite Sync : TTL level positive/negative Sync-on-Green : Composite sync 0.3 Vp-p negative (Video on Vp-p positive)
Maximum Pixel Clock rate 17”/PG19LS/PG19R*/PG21LS : 205 MHz, PG19S*/PG19HS : 240 MHz, PG21MS : 280 MHz
Active Display 17” ; Horizontal : 306 mm ± 3 mm (12.05” ± 0.12”)
Vertical : 230 mm ± 3 mm (9.06” ± 0.12”)
19” ; Horizontal : 352 mm ± 3 mm (13.86” ± 0.12”) ; 330 mm ± 3 mm (12.99” ± 0.12”)
Vertical : 264 mm ± 3 mm (10.39” ± 0.12”)
21” ; Horizontal : 393 mm ± 3 mm (15.47” ± 0.12”)
Vertical : 294.5 mm ± 3 mm (11.60” ± 0.12”)
Input Voltage AC 90 to 264 Volts, 60/ 50 Hz ± 3 Hz
Power Consumption (max) 17”: 120 Watt , 19”: 130 Watt, 21”: 140 Watt
Dimensions Unit ; 17” : 16.3 x 16.9 x 17.2 Inches (415.0 x 430.3 x 438 mm)
(W x D x H) 19” : 18.4 x 19.6 x 19.0 Inches (468.0 x 499.0 x 483.2 mm)
21” : 19.8 x 19.4 x 20.0 Inches (504.0 x 492.0 x 508.0 mm)
Carton ; 17” : 21.1 x 22.3 x 21.9 Inches (535 x 566 x 555 mm)
19” : 22.6 x 23.2 x 22.8 Inches (573.0 x 590.0 x 580.0 mm) 21” : 25.0 x 24.6 x 25.3 Inches (634.0 x 625.0 x 642.0 mm)
Weight (Net/Gross) 17” : 39.0 lbs (17.7 kg) / 45.6 lbs (20.7 kg) (Net/Gross) 19” : 49.6 lbs (22.5 kg) / 58.8 lbs (26.7 kg)
21” : 57.6 lbs (26.1 kg) / 67.3 lbs (30.5 kg)
Environmental Considerations Operating Temperature : 32°F to 104°F (0°C to 40°C)
Humidity : 10 % to 80 % Storage Temperature : -4°F to 113°F (-20°C to 45°C) Humidity : 5 % to 95 %
• PG17**/PG19**/PG21** complies with TCO 99 recommendations for reduced electromagnetic fields.
• Designs and specifications are subject to change without prior notice.
PG17**/PG19**/PG21** 2-1
Item Description
2 Product Specifications
2-2 PG17**/PG19**/PG21**
QRS
P
O
Video
Sync
Sync
Horizontal
Vertical
CDE
P
O
B
A
Video
Sync
Sync
Separate Sync
A : Line time total B : Horizontal sync width O : Frame time total P : Vertical sync width
C : Back porch D : Active time Q : Back porch R : Active time
E : Front porch S : Front porch
B
Green
Vertical
P
Q
R
S
O
Horizontal
Sync-on-Green
800/85 Hz
800 x 600
1600/75 Hz
1600 x 1200
640/85 Hz
640 x 480
VGA3/60Hz
640 x 480
VGA2/70Hz
720 x 400
Table 2-1. Timing Chart
fH (kHz)
A µsec
B µsec
C µsec
D µsec
E µsec
fV (Hz)
O msec
P msec
Q msec
R msec
S msec
Clock Freq. (MHz)
Polarity H.Sync
V.Sync
Remark
31.469
31.778
3.813
1.907
25.422
0.636
70.087
14.268
0.064
1.080
12.711
0.413
28.322
Negative
Positive
Separate
31.469
31.778
3.813
1.907
25.422
0.636
59.940
16.683
0.064
1.048
15.253
0.318
25.175
Negative
Negative
Separate
43.269
23.111
1.556
3.810
5.222
17.778
85.008
13.333
0.080
0.427
12.800
0.027
36.000
Negative
Negative
Separate
53.674
18.631
1.138
2.702
14.222
0.569
85.061
11.756
0.056
0.503
11.179
0.019
56.250
Positive
Positive
Separate
93.750
10.667
0.948
1.501
7.901
0.316
75.000
13.333
0.032
0.491
12.800
0.011
202.500
Positive
Positive
Separate
Mode
IBM VESA MAC.
Timing
68.677
14.561
1.016
2.201
10.836
0.508
84.997
11.765
0.044
0.524
11.183
0.015
94.500
Positive
Positive
Separate
106.250
9.412
0.837
1.325
6.972
0.279
85.000
11.765
0.028
0.433
11.294
0.009
229.50
Positive
Positive
Separate
68.681
14.560
1.280
1.440
11.520
0.320
75.062
13.322
0.044
0.568
12.667
0.044
100.000
Negative
Negative
SOG
91.146
10.971
1.016
1.422
8.127
0.406
85.024
11.761
0.033
0.483
11.235
0.011
157.500
Positive
Positive
Separate
79.976
12.504
1.067
1.837
9.481
0.119
75.025
13.329
0.038
0.475
12.804
0.013
135.000
Positive
Positive
Separate
1024/85 Hz
1024 x 768
1600/85 Hz
1600 x 1200
1152/75 Hz
1152 x 870
1280/75 Hz
1280 x 1024
1280/85 Hz
1280 x 1024
3-1-1 Before making Disassembly
1. Disconnector signal cable and power cord from the monitor.
2. With a pad beneath it, stand the monitor on its front with the screen facing downward and the base close to you.
3. Make sure nothing will damage the screen.
3-1-2 Cabinet Disassembly
1. To uncover the 2 uppermost screws. Press in the end of each screw cap and pull it away from the cabinet.
2. Remove the 4 screw on the Rear Cover and pull it toward to remove it.
3-1-3 Removing the Stand
Pull the tab outward on the Chassis Bottom and pull the Tilt and Swivel Base up to remove it.
3-1-4 Removing the Top Shield
Remove the 1 screws on the Top Shield Cover and remove the Shield.
3-1-5 Removing the Bottom Shield
1. Remove the 1 screw on the Bottom Shield Cover.
2. Lift off the Bottom Shield.
3-1-6 Removing the Video PCB Assembly
1. Remove the Video PCB from the CRT.
2. Disconnect CN102, CN103, CN12 and CN13 on the Video PCB Assembly and Video PCB AssÕy from the CRT Neck.
PG17**/PG19**/PG21** 3-1
3 Disassembly and Reassembly
This section of the service manual describes the disassembly and reassembly procedures for the PG17**/PG19**/ PG21** monitors.
WARNING: This monitor contains electrostatically sensitive devices. Use caution when handling
these components.
3-1 Disassembly
Cautions:1. Disconnect the monitor from the power source before disassembly.
2. Follow these directions carefully; never use metal instruments to pry apart the cabinet.
3-1-7 Removing the Video PCB Assembly
Rear Shield and Video PCB
1. Remove the 3 screws on the PCB Assembly.
2. Remove the Video PCB Assembly Rear Shield. (5 point)
3. Lift out the Video PCB and pleat it on a flat, level surface that is protected from static electricity.
3-1-8 Removing the Main PCB Assembly
1. Remove both side screws (4 screws) on the lower edge of the CRT Bracket.
2. Remove Chassis Ground Wire on the both side.
3. Disconnect CN201, CN409, CN601, H_DY, CN604 and Anode Cap on the Main PCB Assembly.
3-1-9 Removing the Main PCB
1. Remove 6 screws on the main PCB.
2. Pull the Main PCB towards you and carefully lift out the main PCB and placet it on a flat, level surface that is protected from static electricity.
3-1-10 Removing the Bracket
1. Remove the 10 screws on the Front Cabinet.
3-1-11 Removing the Degaussing Coil
1. Using pinch-nosed pliers or long-nosed pliers, carefully push the 4 plastic ties on the Bracket.
2. Lift the Degaussing Coil Assembly from the Bracket.
3 Disassembly and Reassembly
3-2 PG17**/PG19**/PG21**
3-2 Reassembly
Reassembly procedures are in the reverse order of Disassembly procedures.
4-1-1 Before Making Adjustments
4-1-1 (a) ORIENTATION
When servicing, always face the monitor to the east.
4-1-1 (b) MAGNETIC FIELDS
Whenever possible, use magnetic field isolation equipment such as a Helmholtz field to surround the monitor. If a Helmholtz field is not available, frequently degauss the unit under test.
Caution: Other electrical equipment may cause
external magnetic fields which may interfere with monitor performance.
Use an external degaussing coil to limit magnetic build up on the monitor. If an external degaussing coil is not available, use the internal degaussing circuit. However, do not use the internal degaussing circuit more than once per 30 minutes.
4-1-1 (c) WARM-UP TIME
The monitor must be on for 30 minutes before starting alignment. Warm-up time is especially critical in color temperature and white balance adjustments.
4-1-1 (d) SIGNAL
Analog, 0.7 Vp-p positive at 75 ohm, internal termination Sync: Separate/Composite (TTL level negative/positive)
Sync-on-Green: Composite sync 0.3 Vp-p negative (Video 0.7 Vp-p positive)
4-1-1 (e) SCANNING FREQUENCY
Horizontal: 30 kHz to 115 kHz (Automatic) Vertical: 50 Hz to 160 Hz (Automatic)
Unless otherwise specified, adjust at the 1024 x 768 mode (H: 68 kHz, V: 85 Hz) signals.
Refer to Table 2-1 on pages 2-2 and 2-3.
4-1-1 (f) HIGH VOLTAGE ADJUSTMENT
Signal: 1024 x 768 mode (68 kHz/85 Hz) Display image: Full white Contrast: Maximum Brightness: Maximum Limit: 27.3 kV ± 0.5 kV
(17Ó: 26 kV ± 0.5 kV)
Measure the hight voltage level at the anode cap. High voltage should be within the limit as above. If the high voltage needs adjustment use the Softjig.
4-1-1 (g) G2 (SCREEN) VOLTAGE ADJUSTMENT
Signal: 1024 x 768 mode (68 kHz/85 Hz) Display image: Full white Contrast: Maximum Brightness: Maximum
Adjust the Screen VR of the FBT so that the G2 (Screen) Voltage for Toshiba it is 540 V ± 10 V.
4-1-1 (h) CENTER RASTER
Adjust VR401 so that the back raster comes to the center when you apply a signal of 91 kHz/85 Hz.
PG17**/PG19**/PG21** 4-1
4 Alignment and Adjustments
This section of the service manual explains how to make permanent adjustments to the monitor. Direction is given for adjustment using the monitor Interface Board Ver. 2.0 and software (Softjig).
4-1 Adjustment Conditions
Caution: Changes made without the Softjig are saved only to the user mode settings. As such, the
settings are not permanently stored and may be inadvertently deleted by the user.
PG17H* SDD TOSHIBA
G2 525V 635V
PG19S* PG19R*
G2 560V 530V
MEC SDD
4-1-1 (i) BRIGHTNESS AND CONTRAST
Unless otherwise specified, adjust control volumes:
Brightness: Maximum Contrast: Maximum
4-1-2 Required Equipment
The following equipment may be necessary for adjustment procedures:
4-1-2 (a) DISPLAY CONTROL ADJUSTMENT
1. Non-metallic (Ð) screwdriver: 1.5 mm Non-metallic (Ð) screwdriver: 3 mm
2. Philips (+) screwdriver: 1.5 mm
3. Non-metallic hexkey: 2.5 mm
4. Digital Multimeter (DMM), or Digital Voltmeter (DVM)
5. Signal generator, or Computer with a video board that uses the ET-4000 chipset (strongly recommended if using Samsung DM 200 software) and that displays: 1280 x 1024 @ 85 Hz, or 1600 x 1200 @ 85 Hz (maximum).
6. Personal computer
7. Required software: Softjig.exe from Samsung which includes the SF9839TE.MDL (Toshiba CRT) data file Samsung DM200, or DisplayMate for Windows from Sonera Technologies
8. Interface Board Ver. 2.0 Code No. BH81-90001K
9. Parallel communications cable (25-pin to 25-pin); Code No. BH81-90001H
10. Signal cable (15-pin to 15-pin cable with additional 3-pin connector); Code No. BH81-90001J
11. 5 V DC adapter, not supplied
Note: Softjig AssÕy (includes items 8, 9 and 10)
Code No. BH81-90001L
4-1-2 (b) COLOR ADJUSTMENTS
1. All equipment listed in 4-1-2 (a), above
2. Color analyzer, or any luminance measurement equipmen
4-1-3 Connecting the SoftJig
Connect the monitor to the signal generator and/ or PC as illustrated in Figures 4-1 and 4-2.
Note: The signal cable connector which includes
the 3-wire cable must connect to the monitor. If you use Setup 2 (PC only, no signal generator) you can only make adjustments to the signal timing available on that computer system. To make corrections to all factory timings requires the use of an additional signal generator.
4-1-4 After Making Adjustments
After finishing all adjustments, test the monitor in all directions. If, for example, the monitor does not meet adjustment specifications when facing north, reposition the monitor to face east and readjust. This time, try for an adjustment closer to the ideal setting within the tolerance range. Test the unit again in all directions. If the monitor again fails to meet specifications in every direction, contact your Regional After Service Center for possible CRT replacement.
4 Alignment and Adjustments
4-2 PG17**/PG19**/PG21**
MONITOR
INTERFACE BOARD VER. 2.0
PC
SIGNAL GENERATOR
3-WIRE CABLE
SIGNAL CABLE
5V DC ADAPTOR
PARALLEL CABLE
Figure 4-1. Setup 1, With Signal Generator
MONITOR
INTERFACE BOARD VER. 2.0
PC
3-WIRE CABLE
SIGNAL CABLE
PARALLEL CABLE
D-SUB CONNECTOR
5V DC ADAPTOR
Figure 4-2. Setup 2, Without Signal Generator
4-2-1 Centering
Centering means to position the center point of the display in the middle of the display area. Horizontal size and position and vertical size and position control the centering of the display.
Adjust the horizontal size and vertical size to their optimal settings: 352 mm (H) x 264 mm (V). 1280 x 1024 mode (91 kHz/85Hz)
Adjust the horizontal position and vertical position to ² 4.0 mm of the center point of the screen.
|A-B| ² 4.0 mm. |C-D| ² 4.0 mm.
Figure 4-3. Centering
4-2-1 (a) HORIZONTAL SIZE ADJUSTMENT
CONDITIONS
Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum
Click on the << or >> box next to H_SIZE to adjust the horizontal size of the display pattern to 352 mm. (Tolerance: ± 3 mm.)
4-2-1 (b) VERTICAL SIZE ADJUSTMENT
CONDITIONS
Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum
Click on the << or >> box next to V_SIZE to adjust the vertical size of the display pattern to 264 mm. (Tolerance: ± 3 mm.)
4-2-1 (c) HORIZONTAL POSITION ADJUSTMENT
CONDITIONS
Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum
Click on the << or >> box next to H_POSI to center the horizontal image on the raster.
4-2-1 (d) VERTICAL POSITION ADJUSTMENT
CONDITIONS
Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum
Click on the << or >> box next to V_POSI to center the vertical image on the raster.
4-2-2 Linearity
Linearity affects the symmetry of images as they appear on the screen. Unless each row or column of blocks in a crosshatch pattern is of equal size, or within the tolerances shown in Tables 4-1 and 4-2, an image appears distorted, elongated or squashed.
Table 4-1. Factory Preset Modes Linearity
Table 4-2. Other Modes Linearity: VGA, SVGA, XGA,
MAC, etc.
4-2-2 (a) HORIZONTAL LINEARITY ADJUSTMENT
CONDITIONS
Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum
To adjust the Horizontal Linearity, refer to Tables 4-1 and 4-2 for the tolerance range.
Click on the << or >> box next to H_LIN to optimize the image.
4 Alignment and Adjustments
PG17**/PG19**/PG21** 4-3
4-2 Display Control Adjustments
C
A
DISPLAY AREA
EDGE OF BEZEL
B
D
4 : 3
5 : 4
Horizontal: 20.5~23.5 Vertical : 20.5~23.5
Horizontal: 19.18~22.07 Vertical : 20.5~23.5
Supported Timing Mode
Each block (14 %)
Difference between
adjacent blocks (5 %)
Horizontal: Less than 1.10 mm Vertical : Less than 1.10 mm
Horizontal: Less than 1.03 mm Vertical : Less than 1.10 mm
4 : 3
5 : 4
Horizontal: 20.9~23.1 Vertical : 20.9~23.1
Horizontal: 19.60~21.65 Vertical : 20.9~23.1
Standard Modes Linearity
Each block (10 %)
Difference between
adjacent blocks (4 %)
Horizontal: Less than 0.88 mm Vertical : Less than 0.88 mm
Horizontal: Less than 0.82 mm Vertical : Less than 0.88 mm
4-2-2 (b) VERTICAL LINEARITY ADJUSTMENT
CONDITIONS
Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum
To adjust the Vertical Linearity, refer to Tables 4-1 and 4-2 for the tolerance range.
Click on the << or >> box next to V_LIN to optimize the image.
4-2-3 Trapezoid Adjustment
CONDITIONS
Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum
Click on the << or >> box next to TRAP to make the image area rectangular.
Figure 4-4. Trapezoid
4-2-4 Pinbalance Adjustment
CONDITIONS
Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum
Click on the << or >> box next to PIN_BAL to optimize the image.
4-2-5 Parallelogram Adjustment
CONDITIONS
Scanning Frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum
Click on the << or >> box next to PARALL to make the image are rectangular.
Figure 4-6. Parallelogram
4-2-6 Side Pincushion Adjustment
CONDITIONS
Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum
Click on the << or >> box next to BARREL to straighten the sides of the image area.
4-2-7 Tilt Adjustment
CONDITIONS
Scanning Frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum
Click on the << or >> box next to ROTATE to correct the tilt of the display.
4-2-8 Degauss
No adjustments are available for the degaussing circuit. The degaussing circuit can effectively function only once per 30 minutes.
4-2-9 To Delete the User Mode Data
To delete the adjustment data from the user modes, Press the MENU Button for the 10 Seconds .
4-2-10 Save the Data
To save the adjustment data for a mode, press FACTORY SAVE.
4 Alignment and Adjustments
4-4 PG17**/PG19**/PG21**
| C1 |, | C2 | 2.0 mm, | D1 |, | D2 | 2.0 mm.
Figure 4-7. Pincushion
A
5 mm
B
A
B
| D1 |, | D2 | 2.0 mm
Figure 4-5. Pinbalance
D1 D2 D1
C2
D2D1
C1
| A - B | < 5 mm
4-3-1 Color Coordinates (Temperature)
Color temperature is a measurement of the radiant energy transmitted by a color. For computer monitors, the color temperature refers to the radiant energy transmitted by white. Color coordinates are the X and Y coordinates on the chromaticity diagram of wavelengths for the visible spectrum.
CONDITIONS
Measurement instrument: Color analyzer Scanning frequency: 68 kHz/85 Hz Display Size : 352 (H) x 264 (V) Display image: White flat field at
center of display area Brightness: Cut-off Contrast: Maximum
PROCEDURE
Use the directions in sections 4-3-2 through 4-3-4 to adjust the color coordinates for: 9300K to x = 0.283 ± 0.02, y = 0.298 ± 0.02 6500K to x = 0.313 ± 0.02, y = 0.329 ± 0.02 5000K to x = 0.346 ± 0.02, y = 0.359 ± 0.02
4-3-2 Color Adjustments for 9300K
4-3-2 (a) BACK RASTER COLOR ADJUSTMENT
CONDITIONS
Scanning frequency: 68 kHz/85 Hz Display image: Back raster pattern Brightness: Cut-off Contrast: Maximum
1. Select COLOR CHANNEL 1 to control the
color for 9300K.
2. Adjust the luminance of the back raster to
between 0.3 to 1ft-L using the G_CUT controls.
3. Click on the << or >> box next to B_CUT to
set the ÒyÓ coordinate to 0.298 ± 0.02.
4. Click on the << or >> box next to R_CUT to
set the ÒxÓ coordinate to 0.283 ± 0.02.
Note: If the above adjustments cannot be
done to each coordinate, click on the << or >> box next to G_CUT to decrease or increase the green cutoff (bias) and repeat procedures 2 and 3.
4-3-2 (b) G-GAIN ADJUSTMENT
Figure 4-8. Green Box Pattern
CONDITIONS
Scanning frequency: 68 kHz/85 Hz Display image: Green box pattern Brightness: Cut-off Contrast: Maximum
1. Click on the << or >> box next to G_GAIN to adjust the brightness of the Green Gain to 25 ± 1 ft-L.
Note: If you canÕt increase the Green Gain to
the appropriate value, click on the >> box next to increase the ABL point.
4-3-2 (c) WHITE BALANCE ADJUSTMENT
CONDITIONS
Scanning frequency: 68 kHz/85 Hz Display image: Full white pattern Brightness: Cut-off Contrast: Maximum
Figure 4-9. Full White Pattern
1. Click on the << or >> boxes next to R_GAIN and B_GAIN to make the video white. (For 9300K color adjustment: x = 0.283 ± 0.02, y = 0.298 ± 0.02.)
Note: Do not touch the G_GAIN controls.
2. Check the ABL. If it is not within the specifications (30 ± 1 ft-L), use the ABL controls to adjust it.
3. Select COLOR FACTORY SAVE to save the data.
4 Alignment and Adjustments
PG17**/PG19**/PG21** 4-5
4-3 Color Adjustments
1/3H-1/2H
1/3V-1/2V
FRONT BEZEL OPENING
BACK RASTER
GREEN WINDOW
FRONT BEZEL OPENING
BACK RASTER
WHITE WINDOW
4-3-2 (d) WHITE BALANCE ADJUSTMENT VERIFICATION
CONDITIONS
Scanning frequency: 68 kHz/85 Hz Display image: Back raster pattern X-Y Coordinates: x = 0.283 ± 0.02,
y = 0.298 ± 0.02 Raster Luminance 0.3 ~ 1ft-L ABL Luminance 30 ± 1 ft-L Brightness: Cut-off Contrast: Maximum
1. Check whether the color coordinates of the
back raster satisfy the above spec. If they do not, return to 4-3-2 (a) and readjust
all settings.
2. Display a full white pattern.
Note: Do not touch the G_GAIN controls.
3. Adjust the Contrast Control on the monitor so
that the luminance of the video is about 5 ft-L.
4. Check whether the white coordinates of the
video meet the above coordinates spec.
5. Adjust the Contrast Control again so that the
luminance of the video is about 20 ft-L.
6. Check whether the white coordinates of the
video satisfies the above spec. If they do not, return to 4-3-2 (a) and readjust
all settings.
4-3-3 Color Adjustments for 6500K
4-3-3 (a) BACK RASTER COLOR ADJUSTMENT
CONDITIONS
Scanning frequency: 68 kHz/85 Hz Display image: Back raster pattern Brightness: Cut-off Contrast: Maximum
1. Select COLOR CHANNEL 2 to control the
color for 6500K.
2. Adjust the luminance of the back raster to
between 0.3 to 1.0 ft-L using the G_CUT controls.
3. Click on the << or >> boxes next to R_CUT
and B_CUT to adjust the R-Bias to x = 0.313 ±
0.02 and the B-Bias to y = 0.329 ± 0.02.
4-3-3 (b) G-GAIN ADJUSTMENT
This procedure is the same as that for 9300K, refer to the procedure on page 4-5.
4-3-3 (c) WHITE BALANCE ADJUSTMENT
CONDITIONS
Scanning frequency: 68 kHz/85 Hz Display image: Full white pattern Brightness: Cut-off Contrast: Maximum
1. Click on the << or >> boxes next to R_GAIN and B_GAIN to make the video white. (For 6500K color adjustment: x = 0.313 ± 0.02, y = 0.329 ± 0.02.)
2. Refer to the procedure for 9300K, section 4-3-2 (c) steps 2 and 3.
4-3-3 (d) WHITE BALANCE ADJUSTMENT VERIFICATION
Refer to the procedure for 9300K, section 4-3-2 (d).
4-3-4 Color Adjustments for 5000K
4-3-4 (a) BACK RASTER COLOR ADJUSTMENT
CONDITIONS
Scanning frequency: 68 kHz/85 Hz Display image: Back raster pattern Brightness: Cut-off Contrast: Maximum
1. Select COLOR CHANNEL 3 to control the color for 5000K.
2. Adjust the luminance of the back raster to between 0.3 to 1.0 ft-L using the G_CUT controls.
3. Click on the << or >> boxes next to R_CUT and B_CUT to adjust the R-Bias to x = 0.346 ±
0.02 and the B-Bias to y = 0.359 ± 0.02.
4-3-4 (b) G-GAIN ADJUSTMENT
This procedure is the same as that for 9300K, refer to the procedure on page 4-5.
Adjust the brightness of the G_GAIN less 5 ft-L than brightness of procedure for 9300K.
4-3-4 (c) WHITE BALANCE ADJUSTMENT
CONDITIONS
Scanning frequency: 68 kHz/85 Hz Display image: Full white pattern Brightness: Cut-off Contrast: Maximum
1. Click on the << or >> boxes next to R_GAIN and B_GAIN to make the video white. (For 5000K color adjustment: x = 0.346 ± 0.02, y = 0.359 ± 0.02.)
2. Refer to the procedure for 9300K, section 4-3-2 (c) steps 2 and 3.
4 Alignment and Adjustments
4-6 PG17**/PG19**/PG21**
4-3-4 (d) WHITE BALANCE ADJUSTMENT VERIFICATION
Refer to the procedure for 9300K, section 4-3-2 (d).
4-3-5 Luminance Uniformity Check
Luminance is considered uniform only if the ratio of lowest to highest brightness areas on the screen is not less than 7.5:10.
CONDITIONS
Scanning frequency: 68 kHz/85 Hz
(1024 x 768) Display image: White flat field Display size 352 (H) x 264 (V) Brightness: Cut off point Contrast: Maximum
PROCEDURE
Measure luminance at nine points on the display screen (see figure below).
4-3-6 Focus Adjustment
CONDITIONS
Scanning frequency: 68 kHz/85 Hz Display image: ÒHÓ character pattern Brightness: Cut off point Contrast: Maximum
PROCEDURE
1. Adjust the Focus VR on the FBT to display the
sharpest image possible.
2. Use Locktite to seal the Focus VR in position.
4-3-7 Color Purity Adjustment
Color purity is the absence of undesired color. Conspicuous mislanding (unexpected color in a uniform field) within the display area shall not be visible at a distance of 50 cm from the CRT surface.
CONDITIONS
Orientation: Monitor facing east Scanning frequency: 68 kHz/85 Hz Display image: White flat field Luminance: Cut off point at the center
of the display area
Note: Color purity adjustments should only be
attempted by qualified personnel.
PROCEDURE
For trained and experienced service technicians only.
Use the following procedure to correct minor color purity problems:
1. Make sure the display is not affected by external magnetic fields.
2. Very carefully break the glue seal between the 2-pole purity convergence magnets (PCM), the band and the spacer.
3. Make sure the spacing between the PCM assembly and the CRT stem is 29 mm ± 1 mm.
4. Display a green pattern over the entire display area.
5. Adjust the purity magnet rings on the PCM assembly to display a pure green pattern. (Optimum setting: x = 0.295 ± 0.015, y = 0.594 ± 0.015)
6. Repeat steps 4 and 5 using a red pattern and then again, using a blue pattern.
Table 4-3. Color Purity Tolerances
(For 9300K color adjustment: x = 0.283 ± 0.02, y = 0.298 ± 0.02)
7. When you have the PCMs properly adjusted, carefully glue them together to prevent their movement during shipping.
4 Alignment and Adjustments
PG17**/PG19**/PG21** 4-7
Red: x = 0.620 ± 0.015 y = 0.334 ± 0.015
Green: x = 0.289 ± 0.015 y = 0.595 ± 0.015
Blue: x = 0.153 ± 0.015 y = 0.072 ± 0.015
Figure 4-10 Luminance Uniformity Check Locations
Memo
4 Alignment and Adjustments
4-8 PG17**/PG19**/PG21**
PG17**/PG19**/PG21** 5-1
5 Troubleshooting
5-1 Parts Level Troubleshooting
Notes: 1. If a picture does not appear, fully rotate the brightness and contrast controls clockwise and reinspect.
2. Check the following circuits.
• No raster appears: Power circuit, Horizontal output circuit, H/V control circuit, and H/V output circuit.
• High voltage develops but no raster appears: Video output circuits.
• High voltage does not develop: Horizontal output circuits.
5-1-1 No Power Supply
Check and replace FG601, D601,
IC661, IC662.
Done.
Repeating start?
Check and replace D601, D604, D663,
Q632, and Q664.
No
Yes
IC601 Pin 1 waveform is right?
Check and replace IC601,
IC602, IC604.
Yes
No
IC602 and IC604
are right?
Replace parts and verify voltages.
Yes
No
Normal operation
Replace Main board.
Yes
Yes
No
WAVEFORMS
1
1
544 V (IC601, #1)
CH1 P-P = 544 V CH1 RMS = 332.4 V
Verify voltages.
5 Troubleshooting
5-2 PG17**/PG19**/PG21**
5-1-2 DPMS Failure
Check signal source
H/V sync video level.
Make No H/V sync (power off mode)
LED blinks
Check IC201 Pin 39.
Yes
No
+12 V line off
Check IC201 Pin 9.
Yes
No
Q632 Base driving voltage exists?
Check IC201 Pin 10.
Check and replace Q632.
Yes
No
Done
5 Troubleshooting
PG17**/PG19**/PG21** 5-3
5-1-3 H_Deflection Failure
IC402 Pin 6 waveform is right?
Q403 source waveform
is right?
Check D407, D408, Q403, R436
and R438, +210 V line.
Yes
Yes
No
1. Check R401, +12 V line.
2. Check IC402 Pins 6~5, 7~6.
3. Replace IC402.
No
Q404 gate, drain
waveforms are right?
Check Q404, R415.
Check +25 V line.
Yes
No
Q405 base, collector
waveforms are right?
Check and replace D410 and Q405.
Check DY connector connection.
Yes
No
IC261 Pin 4 is high?
Replace IC261.
Check some parts around
Q261 and Q262.
Yes
No
IC261 Pin 26 waveform
is right?
Check some parts around IC261.
Yes
No
WAVEFORMS
2
3
4
5
6
8
7
3
230 V (Q405, Source)
CH1 P-P = 230 V CH1 RMS = 150.1 V
8
12.08 V (IC261, #26)
CH1 P-P = 12.08 V CH1 RMS = 7.396 V
2
10.96 V (IC402, #6)
CH1 P-P = 10.96 V CH1 RMS = 6.180 V
5
54 V (Q404, Drain)
CH1 P-P = 54 V CH1 RMS = 22.44 V
4
11.6 V (Q404, Gate)
CH1 P-P = 11.6 V CH1 RMS = 6.944 V
6
18.6 V (Q405, Base)
CH1 P-P = 55.2 V CH1 RMS = 9.52 V
7
1.216 kV (Q405, Collector)
CH1 P-P = 1.216 kV CH1 RMS = 316 V
Check some parts around Q263.
5 Troubleshooting
5-4 PG17**/PG19**/PG21**
5-1-4 S Correction Failure
S1~S5 signals are right at each
frequency block?
Check S1 ~ S5 signal.
Check and replace
C430, C431, C433, C434, C435,
C437 C441, C453, C454, C455, C456, C457,
Q409~Q413, Q451~Q455, Q456~Q460 .
Yes
5-1-5 H_Lin. Failure
IC201 Pin 21 voltage varies with
different H_Lin. DAC values?
IC403 Pin 7, 8 voltage varies with
different H_Lin. DAC values?
Check +12 V line.
Check some parts around IC403.
Check L403.
Yes
Yes
No
Check and replace IC201.
No
Replace IC201.
No
5-1-6 Invariable H_Size
IC261 Pin 28 voltage varies with
different H_Size DAC values?
IC401 Pin 6 output duty varies with
different H_Size DAC values?
Check some parts around IC261 Pin
28, IC401.
Yes
No
Check and replace IC261.
No
5 Troubleshooting
PG17**/PG19**/PG21** 5-5
5-1-7 Abnormal H_Size
T402 Pin 8 waveform is right?
Check and replace T402.
Check some parts around D415, IC261
Pin 28, IC402 Pin 2 and IC201 Pin20.
Yes
No
5-1-8 Side Pin or Trap Failure
IC261 Pin 24 output exists?
Yes
Check and replace IC261.
Check and replace IC402.
Check some parts IC402 Pin 2
and IC261 Pin 24.
5-1-9 Para. or Pin Balance Failure
IC261 Pin 24 output varies with
different DAC values?
No
Replace IC261.
No
WAVEFORMS
9
9
29.8 V (T402, #8)
CH1 P-P = 29.8 V CH1 RMS = 7.14 V
5 Troubleshooting
5-6 PG17**/PG19**/PG21**
5-1-10 Tilt Failure
IC201 Pin 23 output duty varies
with different DAC values?
IC403 Pin 10, 11 output varies with
different DAC values?
Check and replace IC403.
Check and replace CRT.
Yes
Yes
No
Check and replace IC201.
No
Check tilt connector connection
5-1-11 V Deflection Failure
±14 V line is on?
IC261 Pin 23 output exists?
Check and replace IC261.
Yes
Yes
No
Refer to 5-1-1 No Power Supply
No
IC301 Pin 1 input exists?
Check R276 and R304.
Yes
No
IC301 Pin 6 output exists?
Check and replace some parts
around IC301.
Yes
No
Check V DY connector connection.
5 Troubleshooting
PG17**/PG19**/PG21** 5-7
5-1-12 V Size or Pos. Variation Failure
IC261 Pin 23 output varies with
different DAC values?
Yes
Check some parts around IC301.
Check bias voltage.
Check and replace IC261 and IC301.
No
5-1-13 High Voltage Failure
Q524 gate driving pulse exist?
Check +12 V line.
Check and replace Q521, Q522, Q523,
Q524 and IC501.
Yes
No
Done
5 Troubleshooting
5-8 PG17**/PG19**/PG21**
IC101 (17”: IC104, Pin12) Pin 15
input exists and
varies with different patterns?
Check and replace IC101
(17”:IC104)
.
Input full white pattern to monitor.
No
Yes
T501 Pin 8 output exists?
Check and replace T501.
Yes
No
IC103 (17”: IC04) Pin 16 output
exists and varies with different
patterns?
Check and replace IC103 (17”: IC04).
Yes
No
Check and replace Q101,
Q102 and +12 V line.
Check CN102.
5-1-14 ABL Failure
5-1-15 Dynamic Focus Failure
IC261 Pins 18 and 15 output
are right?
Check and replace IC261.
Yes
No
Some parts around Q551,
Q552, Q553 and Q554 are right?
Replace failed part.
Yes
No
Some parts around T502 are right?
Replace failed part.
Check the connection between FBT
Pin 13, CRT Socket PCB.
Yes
No
13
14
13
2.20 V (IC251, #15)
CH1 P-P = 2.20 V CH1 RMS = 2.776 V
14
580 V (T551, #1)
CH1 P-P = 580 V CH1 RMS = 278.2 V
WAVEFORMS
5 Troubleshooting
PG17**/PG19**/PG21** 5-9
5-1-16 No Video
IC101 Pins 2, 6 and 11 (17”: IC104,
Pin 5, 8, 10) inputs are right?
IC101 Pins 29, 32 and 35
(17”: IC104, Pin 25, 28, 30) outputs
are right?
Check I2C bus and +12 V line.
Yes
Yes
No
Check CN101 and BNC B’D IC1.
No
IC102 Pins 4, 6 and 14 (17”: IC105,
Pin 1, 3, 5) outputs are right?
Check +12 V line.
Check and replace IC102 (17”: IC105).
Yes
No
Cathode DC levels are right?
Check +80 V line.
Check and replace IC101 and IC104
(17”: IC104).
Yes
No
G2 voltage is right?
Check G2 wire, CRT Socket board,
and FBT.
Change CRT.
Yes
Done.
No
Check signal cable and connection.
5 Troubleshooting
5-10 PG17**/PG19**/PG21**
5-1-17 Micom Failure
IC201 Pin 11 input is right?
IC201 Pins 13 and 14 inputs
are right?
Check X201, C204 and C205.
Yes
Yes
No
Check IC606.
No
IC201 Pin 18 input is right?
Check IC202.
Yes
No
All in/output values are right?
Replace IC201.
Yes
No
Done
15
16
15
3.42 V (IC201, #33)
CH1 P-P = 3.42 V CH1 RMS = 2.500 V
16
3.16 V (IC201, #32)
CH1 P-P = 3.16 V CH1 RMS = 2.560 V
WAVEFORMS
5 Troubleshooting
PG17**/PG19**/PG21** 5-11
5-1-18 OSD Failure
IC103 (17”: IC04) Pin 17 input is
right?
IC103 (17”: IC04) Pin 6 input is
right?
Check and replace Q104 (17”: Q103) .
Yes
Yes
No
Check and replace D302 and Q301.
No
IC103 (17”: IC04) Pins 7 and 8
inputs are right?
Check IC201 Pins 41 and 42.
Yes
No
IC103 (17”: IC04) Pins 20, 21 and
22 outputs are right?
Check and replace IC103 (17”: IC04) .
Yes
No
IC101 (17”: IC104) Pins 4, 9 and 13
inputs are right?
Check and replace QB51,
QG51 and QR51.
Check and replace IC101 (17”: IC104) .
Yes
Done
No
Check CN102 and connector Ass’y.
(17” only)
5 Troubleshooting
5-12 PG17**/PG19**/PG21**
RL601 operation is right?
Q630 base input is right?
Check and replace Q630.
No
No
Yes
Check D-Coil, TH601.
Yes
IC201 Pin 40 output is right?
Check and replace IC201.
Check user function key.
Yes
No
R217 and R630 are right?
Replace R217 and R630.
Done
Yes
No
Check degaussing connector.
5-1-20 Degaussing Failure
5-1-19 User Control Failure
IC201 Pins 35 and 36 inputs are
right at each function.
Check and replace function key.
Check and replace IC201.
Done
Yes
No
Check connector Ass’y.
5 Troubleshooting
PG17**/PG19**/PG21** 5-13
5-2 General Troubleshooting
5-2-1 No Picture
LED blinks?
LED is green color?
After restart monitor LED don’t
come on, repair power circuit.
Check signal cable.
Check G2 voltage, high voltage,
R, G, B cathode voltage.
Yes
No
No
LED is Amber color?
No
Yes
5-2-2 Shut down
Yes
5-2-2 Shut Down
Blinking LED’s?
Scan failure
Check horizontal, vertical deflection
system and check power supply
secondary voltages.
No
Yes
Yes
Check power supply.
No
High voltage failure?
Check high voltage system.
Check and replace IC201.
Done
No
Yes
Video failure?
Check Video board.
No
Yes
5 Troubleshooting
5-14 PG17**/PG19**/PG21**
5-2-3 Missing Color
Are proper Video levels
on CN101 (D-Sub) Pins 1, 2 and 3,
R-BNC, G-BNC and B-BNC.
Are proper AC voltage on all
cathodes?
Refer to 5-1-16 No Video.
Yes
Yes
No
Check signal generator and cathode.
No
Are proper DC voltage on all
cathodes?
Check IC104 (17”: IC104 Pins 19, 20,
and 21) Pins 10, 11 and 12.
Check QB02, QB03, QG02, QG03
QR02 and QR03.
Change the CRT.
Done
Yes
No
Is G2 voltage right?
Check G2 wire, G2 control, volume
and FBT.
Yes
No
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