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The Television Receiver
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-Introduction-/-Instructions
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SAFETY
------------Fundamentals------------
SAFETY
Communications
  Temporal Basics
 Spatial Basics
Practices
End-to-End Model
 Timing
Display Types
Glossary
Receiver SNR
 Raster Scan
Resolution 
Video
 Antennas
  Raster Scan, Interlace
Kell Factor
 Waveforms
Spectrum
NTSC Metrics (Numbers)
Aspect Ratio 
 DC Restoration
 
Unified H V Sync
 Gamma
 Symptoms
 
 
 
 
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Now why Didn't I think of that?
In my younger days, I use to repair television sets for a living. But I gave it up after a short time because of the stress of dealing with my customers. Years later, a friend and I were comparing notes about our days as TV repairmen. I related how it really bothered me, when returning a set to the customer's house--usually in the daytime; and how the "lady of the house" would say how the picture had been "so much better" before the set broke, and before I worked on it--no matter what the problem had been. 

My friend said that had also been his experience; but that he had found a surefire cure that worked every time. He described how he would get behind the set, and while turning the Vertical Hold control--rolling the picture first one way and then the other--he would ask the Lady of the House to look at the "pictures" and tell him which picture looked the best. At this point she would get real serious and tell him: "no ... no ... go back one; one more... That's it ... No ...back one more. Oh ... yes... that's it ... that's it ... a perfect picture!"   --Now why Didn't I think of that?
 

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Copyright 2000 - 2003  Comments or Questions webmaster@williamson-labs.com
3-15-2001Last update 12-19-2003
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 .
.Introduction
This, the first installment of Television Troubleshooting, deals with the operation minus the COLOR technology; this is done to reduce the complexity that Television Technology is rife with. Color will be the subject of the Next Installment.
 

 



 
 

 

.Instructions
   <-Navigating->
This tutorial on Television Troubleshooting & Repair is best viewed using Netscape 4.x or above.

The main feature is the tutorial is the Index, or Starting page, which has the Block Diagram of the entire television receiver. This diagram's blocks are hot linked to individual pages that expand on that block's function. This can be extended for finer detail by follow on pages. Remember, the "<BACK" buttons will always allow you to return to the Starting page.

In addition, the diagram is subdivided into four sub-blocks which are linked to a larger version that has hot linked blocks (this feature is not necessary for navigation throughout the tutorial). 

Each individual page has a "<BACK"--button, and a "NEXT>"--button, allowing for ease of navigation. Some pages have further hot links to even more detailed information; such as schematics, and or circuit descriptions. 

There is also a "HOME"-- button always at the top center of the page, which will return you to the Starting page, if all else fails..
 
 
 
 

SAFETY --Introduction

 

UHF Antenna UHF Tuner UHF Frontend UHF Local Oscillator VHF Antenna Transmission Line VHF Tuner R.F. Amplifier Mixer Local Oscillator Channel Selector Picture I.F. Amplifier Video Detector AGC Circuit AGC Distribution wf-rf-amplifier-output mixer out wf-picture-if-out Video Amplifier CRT Contrast Control Brightness Control Composite Video 4.5 MHz Trap Sound I.F. Amplifier Sound Demodulator Audio Amplifier wf-sound-carrier-in-if-input wf-sound-if-output wf-rf-out-sound-carrier Video & Sound Carrier 150_Volt Power Supply HV Rectifier Low Voltage Power Supply Damper Diode Flyback Transformer Deflection Yokes Horizontal Amplifier Horizontal Oscillator Phase Detector High Pass Filter Horizontal Hold Phase Locked Loop wf-sync-sep-input wf-horizntal-oscillator-out Composite Sync Voltage Control Voltage wf-timing-feedback wf-horiz-sync wf-horiz-amp-output Vert Sync Low Pass Filter Sync Separator Vertical Oscillator Vertical Hold Vertical Deflection Amplifier wf-vert-sync wf-vert-amp-output wf-vert-osc-output Receiver Sound Section Raster Section Power Supplies Receiver Frontend Safety HV
 
 
 

 

 
 
 
 

Raster
 

Power Supplies
 

Receiver Frontend
 

Intercarrier Sound Section
 

Receiver
 

6
 

UHF Tuner
 

UHF R.F. Amplifier/Mixer
 

VHF Antenna
 

VHF Transmission Line
 

VHF Tuner
 

VHF RF Amplifier
 

Mixer
 

VHF Local Oscillator
 

Channel Selector
 

Picture IF Amplifier
 

Video Detector (AM)
 

Keyed AGC Detection
 

AGC Distribution
 

RF Amplifier Signals
 

Mixer Signals
 

Pic IF Output Signals
 

Video Amplifier
 

CRT
 

Contrast Control
 

Brightness Control
 

Video
 

4.5 MHz Trap
 

Sound IF Section
 

Sound Demodulation
 

Audio Amplifier
 

4.5MHz Sound IF Input
 

4.5MHz Sound IF Output
 

Video & Sound Spectrum
 

4.5MHz Intercarrier Sound
& Video Splitting
 

150_Volt Power Supply
 

HV Supply, etc.
 

Low Voltage & Bias Supplies
 

Damper Diode
 

Flyback Transformer
 

Deflection Yokes
 

Horizontal Output
 

Horizontal Oscillator (VCO)
 

Phase Detector (AFC)
 

HPF
 

Horizontal Hold Control
 

Phase Locked Loop (PLL)
 

Sync Separator Input WF
 

49
 

Frequency Control Voltage
 

WF PLL Feedback
 

Horizontal Sync, HD
 

Horizontal Drive Wave Form
 

Vertical Sync LPF
 

Sync Separator
 

Vertical Oscillator
 

Vertical Hold Control
 

Vertical Output Amp
 

Vertical Sync Input
 

Vertical Output WF
 

61
 

Composite Sync, RS-170A
 

Warning High Voltage
 

UHF Local Oscillator