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Summary of Contents for JBL 6810
- Page 1 Professional Video Products TECHNICAL TRAINING MANUAL MODEL 6810 AND 6820 VIDEO PROJECTOR JBL International 8500 Balboa Blvd. Northridge, CA 91329 ( 8 1 8 ) 8 9 3 - 8 4 1 1...
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Page 2: Table Of Contents
CONTENT Subject Page Signal Flow Block Diagram Power Supply Panel Switched Regulator High Voltage Regulator Deflection Panel Horizontal Sweep Circuits Vertical Sweep Circuits Overload Protection Circuits TS10 Tuning System RF Switcher IF Module Stereo/SAP Decoder Module Tuner Interface Panel input/Output Panel Audio Switching Circuits Video/Sync Switching Circuits RGB Switching Circuits... - Page 3 Figure 1 - Signal Flow Block Diagram...
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Page 4: Signal Flow Block Diagram
Signal Flow Block Diagram The major functions of the projection TV system Detected Video from the IF Module is fed through are shown in the Overall Block Diagram, Figure the Tuner Interface Panel J32 to I/O Panel The selected RF signal is fed from the RF J707, the Tuner Video Input. -
Page 5: Power Supply Panel
Power Supply Panel The locations of major components on the Power Voltage Doubler is fed to the Switched Regulator, Supply are shown in Figure 2. Starting in the which outputs the 130Vdc source voltage. lower left, they are: Stand-By and Start-Up Power Transformer;... - Page 6 As seen in Figure 4 the 12Vdc Stand-By voltage Oscillator Module, drives the Horizontal sweep is applied to the 5V Regulator IC500-3 where it circuits and the Switched Regulator on the Power becomes the Keep Alive voltage for Micro- Supply Panel. R5 and C10 form a two second computer IC1000.
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Page 7: Switched Regulator
T P 6 SWITCHED REGULATOR POWER ON HV XFMR T 4 - I HV(EHT) REGULATOR Q I 4 COMMON FROM SHUTDOWN TP2 LATCH HORIZ PULSE 5 0 / 5 0 DUTY CYCLE J ' FROM DE FLECTION PANEL J215-5 SWITCHED REGULATOR POWER SUPPLY (PULSE WIDTH MODULATOR) Figure 5... -
Page 8: High Voltage Regulator
High Voltage Regulator Q13 and Q12 emitter voltages. Q12 conducts less and its collector voltage rises, turning On Q14 to The HV Regulator circuit, Figure 6, is driven restore 10Vdc (EHT) Reference by a control circuit consisting of a voltage increasing the 117Vdc to HV Transformer comparator Op-Amp IC2, HV (EHT) Adjust RP2, T4-13. -
Page 9: Deflection Panel
Deflection Panel Horizontal Oscillator Module The photograph showing the Deflection Panel, The circuits of the Horizontal Oscillator Module Figure 7, calls out the power supply section are shown in Figure 8. The internal function of and components. The panel is divided into IC1 are: Sync Separator, Video Amp, AGC, Noise Vertical sweep circuitry and the power supplies inverter, Phase Shaper, Phase Control, and the... -
Page 10: Vertical Sweep Circuits
DEFLECTION PANEL J 2 I 7 VERT. - 1 0 BLANKING - » • • OUTPUT J 2 I 7 « T P 2 7 TO VERT. - » „ SWEEP CIRC J 2 I 7 FROM -» VERTICAL | j 2 l 7 t OUTPUT NN~6 , TO HORIZ. -
Page 11: Overload Protection Circuits
Figure 9 - Vertical Sweep Circuit Horizontal Sweep Circuits L2 on the Deflection Panel. Both Vertical and Horizontal Drive signals are During normal operation, the 10Vdc (EHT) coupled from the Horizontal Oscillator Module to Reference voltage is fed from Power Panel the Deflection Panel through J301, as seen in J108-3 to D10, charging C37 and C38 to about Figure... -
Page 12: Ts10 Tuning System
The Switched Regulator and the scan-derived 178-channel Controller, the Tuner, and the voltages from the Horizontal Output Transformer Tuner Interface Panel. The Controller uses an are killed; only the Stand-By 12Vdc supply 8-but Microcomputer, a CITAC IC, a Micro- remains active, the 24Vdc Start-Up supply is processor with internal ROM for processing On- On, but it is inactive until the Power Button is... - Page 13 Channel selection, Channel Scan Up/Down, Mute, Last Channel Viewed and Volume Level Alternate Channel (Quickview or Review), memories. The chassis is powered On by a Recall, Balance, Bass, Treble, SAP selection, microcomputer-controlled relay. The CITAC IC Mono/Stereo selection, Expanded Sound selection, controls bandswitching, channel tuning, volume, Antenna/Accessory 1/Accessory 2, RGB, A/V1/ muting, bass, treble, and balance;...
- Page 14 Graphics Generator on the Controller. Composite Blanking is developed by adding Vertical pulses to the Horizontal pulse line through Inverter Q21. Blanking is then coupled to the Graphics Generator on the Controller. R, G, and B Graphics Video signals are fed through RGB Buffers Q12, Q11, and Q10 to the Video Processor Panel J414 through J18-1, -2, and -3.
- Page 15 Figure 14 - T S 1 0 Tuning System Block Diagram...
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Page 16: Rf Switcher
RF Switcher The RF Switcher, shown in Figure 15, is located between the RF input connection to the set and the input to the Tuner. Three RF signals may be connected to the Switcher input jacks. addition to the signal from the VHF TV antenna, the RF signal from accessories such as VCRs, video games, video disc players, and personal computers can be attached. -
Page 17: If Module
IF Module two bandpass curves shape the Video IF and Sound IF responses. The Video response is notched at The IF Module shown in Figure 17 plugs into the 41.25MHz Sound carrier and fed to IC1 for the Tuner Interface Panel. Caliouts point to the amplification detection. -
Page 18: Stereo/Sap Decoder Module
Figure 18 - IF Circuit Stereo/SAP Decoder Module and Phase Control (AFPC) circuit. The AFPC circuit compares the phase of the Pilot signal A photograph of the Stereo/SAP Decoder Module with the phase of the local Oscillator signal, and is shown in Figure 19. The major functions the output correction voltage provides automatic and components are: the Stereo Decoder IC1,... - Page 19 position, the "Y" switch is closed and connects the variable Gain Amp "B," and the 4KHz-to-9KHz L-R signal to Pin 4. The L-R signal is coupled band of frequencies is coupled to RMS detector through Buffer Q4 to Pin 18 of the Expanded IC5. "B."...
- Page 20 Figure 20- Decoder Module Signal Flow Diagram...
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Page 21: Tuner Interface Panel
in resistor matrix R93/R91. When the +R+R through a 0-to-12KHz lowpass filter to Pin 6 of and -L+R signals are added, the opposite polarity IC4. The amplified SAP signal is output Pin 7, L signals cancel, while the two positive R signals taken from the arm of the Level Adjust control, add. - Page 22 TUNER INTERFACE PANEL TUNER 0 / I 2 V D C TUNER RESET, CONTROL A / V I LOGIC ENCODER, FOUR BUTTON J 7 I 5 A U D I O / V I D E O A U D I O / V I D E O >•...
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Page 23: Input/Output Panel
tuning control system to stop the tuning action. is inverted to a High and applied to Pin 1 of all AND Gates. With both inputs of AND Gate A High, The Tuner Interface Panel Audio/Video Logic the output at IC1-19 is High and turns On Tuner Encoder section, Figure 2 2 , shows the Audio/- switch Q2. -
Page 24: Audio Switching Circuits
monitor, VCR, or other accessory at the end of the Video cable. RGB Video from either a TTL (digital) or analog source is terminated by the TTL/Analog switch. TTL Video is terminated by a 2.2K Ohms load impedance and an analog signal is terminated into 75 Ohms. -
Page 25: Rgb Switching Circuits
+ I3V OUTPUT BUFFER TUNER VIDEO (o> V I D E O gs. O U T P U T A / V I V I D E O I N VIDEO T H R U OUTPUT BUFFER A / V 2 VIDEO I N ®... -
Page 26: Computer Intensity Bit Switching Circuits
Computer Intensity Bit Switching Insert Video Switching Circuits Circuits Some accessory devices such as decoders for In addition to RGB signals, some color comouters Teletext/Videotext and RGB computers, output generate a separate brightness or luminance special RGB Video and Blanking signals used to signal called the Intensity Bit signal. -
Page 27: Sound Processing Module & Stereo Amplifier
10W STEREO POWER A M P Figure 27- Sound Processing M o d u l e Sound Processing Module & Stereo Amp Left and Right Audio signals from the Input/ Output Panel J718-4-1 are fed to the Sound The Sound Processing Module and the Stereo Processing Module through J1104-1, -4 to Amplifier are shown in Figure 27. - Page 28 The Audio circuits are muted briefly when power velops 15Vdc, which is regulated to 8Vdc by is first turned On to prevent a "thump" heard in zener Z401. IC201 is powered by the 8Vdc the speakers caused by Power Supply voltage supply.
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Page 29: Comb Filter Module
Figure 3 0 - Stereo Power Amplifier Comb Filter Module Vertical Detail signal to replace vertical resolution lost during the Video combing process. The Comb Filter Module components and Q6 Vertical Detail gain is adjusted with RP3 and functions are illustrated in Figure 3 1 . They fed to Q4 Mixer base. - Page 30 Figure 31 - C o m b Filter Module Figure 32- Comb Filter Circuit...
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Page 31: Video Processor Panel
VERTICAL b ! ? g £ PULSE A M P CONTRAST F E R GREEN LIMITER • VIDEO PULSE Q 3 8 , BUFFER CLAMP BLUE VIDEO BUFFER COMB FILTER INTERCONNECT PINS J 4 1 5 CHROMA PEAKING Q22. Q23 AUTO BLACK CONTROL Q39. -
Page 32: Video Processing Circuits
Figure 3 4 - Video/Chroma Processing Circuits color occurs when IC2-9 is 5Vdc. The tint adjustment is made by changing the dc voltage at Video Processing Circuits IC2-7 with the Tint control. The normal setting for good flesh tones is about 2Vdc. Negative Video from the Comb Filter J416-6 is fed to Luminance Buffer Q20, which feeds Video Internal matrixing of the demodulated Chroma... -
Page 33: Rgb Processing Circuits
insert Blanking in the Video signals and the Clamp Pulse is used for dc restoration. The Sand Castle circuit is composed of a dual Flip Flop IC5, Pulse Clamp D21/D24, Pulse Clamp Q41, Clamp Pulse Buffer Q25, Vertical Pulse Amplifier Q42, and Matrix diodes D28/D25 and D20/D22. -
Page 34: Crt Drive Panel
G2 CONNECTOR P1205 FOCUS CONNECTOR CRT DRIVE ADJUST Figure 3 6 - CRT Drive Panel sweep voltages are removed because of a shut- CRT Drive Panel down condition, the CRT beam currents could There are three Drive Panels, all of which are produce a high-intensity spot on the faceplate identical in circuitry and component layout, and permanently damage the phosphor coating. - Page 35 Figure 37- CRT Drive Circuit...
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Page 36: Convergence Panel
present at the top of R22. Should the set go into The block diagram of the convergence circuits is shutdown or be turned Off, the 200Vdc supply shown in Figure 39. The main circuits are: the decays to zero, which grounds the CRT cathodes Horizontal Ramp Generator, power source for the and the positive terminal of C4;... - Page 37 J1102 I C I J 607 HORIZONTAL H0RIZ*-4£ HORIZONTAL RAMP WAVEFORM 8VPP HORIZONTAL GENERATOR AMP/CONT CONVERGENCE HORIZ 15V SOURCE DELAY < > MODULE -*\ 8VREG r ^ . g n i SOURCE I C 3 TOP/BOT — 15V SOURCE VERTICAL PINCUSHI CONVERGENCE - 8 V...
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Page 38: Convergence Panel Voltage Source
Figure 41 - Horizontal Delay M o d u l e Circuit CUSTOMER CONTROL T P I 8 ( T P I 6 AND POWER SUPPLIES — • i5V — • • 8 V DEFLECTION^ • T P I 9 •... -
Page 39: Horizontal Waveform Amplifier
Horizontal Waveform Amplifier Vertical Waveform Amplifier The negative pulses from capacitor C4 drive The Vertical Waveform Amplifier IC4, Figure IC1-2, Figure 44. The negative pulses are 4 5 , is derived by a 2Vpp negative Vertical processed into a 3Vpp negative sawtooth at sawtooth fed from the Horizontal Delay Module IC1-1/TP2 and a positive 3Vpp sawtooth at J1102-5. -
Page 40: Top/Bottom Pincushion Generator
VERTICAL 2.5Vpp RATE VERTICAL FROM H OELAY • MODULE J 6 0 7 - I Figure 4 5 - Vertical W a v e f o r m A m p l i f i e r Vertical Convergence Amplifier, and Keystone Top/Bottom Pincushion Generator signals are sent to the Horizontal Convergence IC3 is a Modulator/Inverter which modulates a... - Page 41 Figure 47 - Keystone/Trapezoid Generator Figure 48 - Side Pincushion Generator...
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Page 42: Side Pincushion Generator
Crosshair Generator Side Pincushion Generator The Crosshair Generator, Figure 50, major Side Pincushion correction is developed by IC5, components are: Horizontal Waveform Amplifier which reduces the inward curvature on the left IC1, Vertical Waveform Amplifier IC4, Zero and right sides of the raster. IC5 operates as a modulator, Figure An Offset Vertical... - Page 43 Figure 5 0 - Crosshair Generator...
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