Major Parts Locations DM Module Replacement CRT Removal CRT Installation Equipment and Initial Setup LED Indicator Diagnostics Remote Control Operational Mode Circuit Adjustment Mode Service Mode Reset Convergence Adjustment Mode Adjustment Items List Adjustment Procedures Test Point Locations Geometry Presets Deflection Geometry Adjustments Convergence Geometry Adjustments Coarse Convergence Adjustments Fine Convergence Adjustments Parts Ordering Critical and Warranty Parts Designation Parts Tolerance Codes Quick Reference List Page 5.
Service personnel should read this manual thoroughly before. Assembly and disassembly instructions for the front and rear cabinet components. Servicing of the Lenticular Screen and Fresnel Lens.
Servicing printed circuit boards PCBs. Chip parts replacement procedures. At the same time, this potential is fed back to pin 16 for Hot Plug Detection. The DVI input is not intended for use with personal computers or devices outputing video signals with computer resolution. Firewire is a trademark of Apple Computer, Inc. Since all features and disassembly procedures are in the Service Manual, this chapter will only provide a general discussion. Even without the front control panel, card reader or front inputs, it is still fully functional by use of the remote control.
This allows easier access to test points, etc. Remove the Back Board by removing 7 screws a , 2 screws b and 8 screws c.
Remove the Back Cover by removing 8 screws d. Remove 8 screws f to remove the Board Shelves. Remove screw g holding the chassis. Remove 4 screws h securing the Light Box Assembly. Be certain that all cables and connectors between the Light Box Assembly and external items are disconnected e.
Slide the Light Box Assembly from the cabinet. The procedure is similar for all models. Refer to the Service Manual for specific disassembly instructions on all models. If the lightbox is being serviced without the front panel, no indication of these requirements will be present. Although not required, for the reasons noted, it is usually better to have the front panel connected when servicing the lightbox. If this is not possible, the following power up sequence should be used: 1 2 3 4 5 Apply AC power.
Press the remote Power button once. Wait 90 seconds. If no response, press the Power button again. Release the Chassis Locks on each side of the chassis. Slide the Chassis out the rear of the unit. Tilt upward to access the bottom of the main chassis. Check operation before installing the DM Cover, Step 3.
Dynamic Audio Amp. Vertical Defl. Beam Convergence Amps. The major circuit functions performed on each PCB is listed in Table With the heat sink fins over the top of the IC, access for replacement is restricted. To simplify replacement use the following procedure to remove the heat sink.
It has a composite cabinet back that offers several advantages. The disassembly procedure for the cabinet front differs from conventional cabinets. Note how the Cosmetic Front Panel is removed. Refer to Figure Remove the Speaker Grille by pulling forward. Remove 2 screws a securing the Cosmetic Front Panel. Remove 6 screws b to remove the Board Front.
Unplug the LF connector. Remove the 4 screws c securing the Screen Assembly. Lift the Screen Assembly up and away from the cabinet. This chapter will give an overview of the following alignment procedures. See Figure Many of the adjustments must be performed in both the i and i modes. Select the signal source i or i. Press the number buttons "0", "3", "5", "7" in sequence.
The screen will change to the Circuit Adjustment Mode. Note: Repeat steps 2 and 3 if the circuit adjustment mode does not appear on screen. Then select the adjustment item. Refer to the following pages for the listing of adjustment functions and adjustment items. Each time the button is pressed, the Function changes in the sequence shown in Figure Note: The circuit adjustment mode can also be terminated by turning the power OFF. The character display turns red for approximately one second in this step.
However, data changes are not automatically saved. Press MENU 2. When the Convergence Mode is activated, this display appears on a Green Crosshatch. This occurs since a black screen is required when making the HV Regulation adjustment. The on-screen display changes in the Fine mode, as shown in Figure The display shows the vertical and horizontal data for the current Cursor Position, and the horizontal and vertical coordinates for that position.
Data is automatically saved at this time. Three additional supplies are derived from the 9VS supply, 5VS, 3. IC9A10 is the same is the same type of regulator used in the V Signal from pin 10 of T9A10 is rectified, generating the 9VS supply. Regulation IC9A10 does not regulate by controlling the PWM of The signal from pin 2 of the transformer is rectified and the oscillator signal. Under light loads, more of the cycles are removed, generated 6.
Regulator circuit, serving as a start-up voltage source. The 5VS and 3. Regulation The secondary 12VS supply is monitored for regulation. Time Shift Recording Power Supplies. It is also the source for the 3. IC2E65 generates 2. Signal from pin 3 of T9A50 is rectified by D9A44 and added to the start up voltage to maintain oscillation.
The PWM is automatically changed to maintain a constant V source. Reset Circuitry Figure illustrates the Reset circuitry in more detail. The normal and Reset logic are shown in the diagram. Figure illustrates the Command Input circuit. It is basically the same as that in the V19 and V21 so an in depth description is only necessary on those parts that are different.
The front panel Buttons are in a conventional resistive ladder configuration. The command is identified by the change in voltage at the KSC input.
There are differences in the Remote input circuitry due to the Remote Learning feature of the V The signal is processed and routed Figure also shows that the DM Module receives and processes the signals from the Card Reader. This connection was not used in the V19 and V It enables the Learning feature. The signals from the units Remote are memorized by the SYS-5 circuitry. The monitoring circuit is shown in Figure Samples of the input AC are applied to the base of Q9A D9A16 removes the negative half of the sine waves.
The remaining positive half cycles keep Q9A10 conducting. Figure shows the Serial Data lines and indicates what circuits they control. This informs the Control circuitry power has been lost. Decreases H-Defl DC supply during freq. Most of the parallel outputs are listed in Table Most of them have been used before and need no explanation. However, the function of two items should be described. Due to this design, artifacts may appear in the picture when the signal source is NTSC.
The High reduces some of the high frequency output from the Doubler, removing the unwanted artifacts. Although initially it looks the same as in the V21, there are differences. Therefore all signals must pass through the Doubler. Since it is the same as that in the V21, no explanation is necessary.
The basic Digital Signal path was shown in Figure Figure shows the Digital Path in more detail. There are two inputs at the rear of the DM module. A third input is on the front of the Card Reader. The Card Reader serves as a feed through for the signals and does not process these signals at all. The I. The V23 can display either of two scanning formats, p or i. The horizontal scanning frequency for p is Sync Select circuitry selects the Main picture sync source.
The selected output is used to synchronize the Horizontal and Vertical Deflection Generators. If the source signal is i, horizontal sync is doubled, before synchronizing the Horizontal Drive Generator. Conventional i TV signals have a scanning rate of For these signals, line doubling circuitry changes the signal format from i to p. Horizontal deflection drive is amplified by the Horizontal Output circuitry and directed to the horizontal windings in the Deflection Yokes.
HV Drive is amplified at directed to the Flyback transformer. Obviously all 5-wire inputs have separate horizontal and vertical sync. Output from the Vertical Generator is amplified in the Vertical Output circuitry and directed to the vertical windings in the Deflection Yokes.
NTSC and Composite signals are i scanning format. Component signals can be i, p or i. Figure shows the sync signal functions performed by the PCN-Signal. If the selected source is i, the number of horizontal lines are doubled.
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