TABLE OF CONTENTS
Page
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
LIST OF ILLUSTRATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
TELEVISION SIGNALS AND RECEIVER FUNCTIONS
2.0 TELEVISION SIGNAL PROCESSING . . . . . . . . . . . . . . . . . 10
2.1 THE TRANSMITTED TELEVISION SIGNAL . . . . . . . . . . . 10
2.2 THE TELEVISION RECEIVER . . . . . . . . . . . . . . . . . . . . . . . 14
2.2.1 TYPICAL TELEVISION RECEIVER BLOCK
DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14
2.2.2 TELEVISION RECEIVER TUNED CIRCUITS . . . . 16
2.2.2.1 STAGGER-TUNED CIRCUITS ........... 16
2.2.2.2 TRAP FREQUENCY CIRCUITS . . . . . . . . . 16
2.2.2.3 USE OF OVERCOUPLING IN
TUNED CIRCUITS . . . . . . . . . . . . . . . . . . . . . 1 7
2.2.2.4 IMPORTANCE OF TUNING SLUG
LOCATION IN TUNED CIRCUITS ....... 17
2.3 SWEEP ALIGNMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.3.1 IMPORTANCE OF SWEEP ALIGNMENT ........ 18
2.3.2 SWEEP ALIGNMENT METHODS . . . . . . . . . . . . . . . 20
FUNCTIONAL DESCRIPTION OF THE MODEL 415 CIRCUITS
3.0 MODEL 415 SWEEP/MARKER GENERATOR
BLOCK DIAGRAM ................................. 23
3.1 SWEEP CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.2 44 MHz SWEEP OSCILLATOR AND
1-F MARKER SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.2.l 44 MHz SWEEP OSCILLATOR ................ 23
3.2.2 1-F MARKER OSCILLATORS .................. 23
3.2.3 EXTERNAL MARKER INPUT . . . . . . . . . . . . . . . . . . 23
3.2.4 100 KHz MARKERS .......................... 23
3.3 MARKER DETECTOR AND AMPLIFIERS . . . . . . . . . . . . 23
3.4 PATTERN AMPLIFIERS ............................. 24
3.5 PIX OSCILLATOR AND CHROMA FUNCTION 25
3.6 CHANNEL
4 AND CHANNEL 10 MIXING
OSCILLATORS Q301 AND Q303 .................... 25
3.7 VIDEO SWEEP AMPLIFIER Q401 ..•............... 26
3.8 MARKER FREQUENCY RELATIONSHIPS ............ 26
3.9 10.7 MHz CIRCUJTRY ............................. 27
3.10 POWER SUPPLIES AND BIAS SUPPLIES ............ 27
INTRODUCTION TO TELEVISION ALIGNMENT USING
THE MODEL 415
4.0 MATCHING THE MODEL 415 TO THE RECEIVER .... 28
4.1 GENERAL ALIGNMENT INFORMATION ............ 28
4.1.1 VIDEO SWEEP ALIGNMENT OF
CHROMA CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.1.2 1-F AND CHROMA ALIGNMENT CHECKS . . 28
4.1.3 PREALIGNMENT OF TRAPS AND TUNED
CIRCUITS USING MARKER FREQUENCIES . . . . . 28
4.1.4 OVERALL RECEIVER ALIGNMENT CHECK .... 28
4.2.1 VIDEO ...................................... 28
4.2.2 IF POSITION ................................ 30
4.2.3 MKR ........................................ 32
4.2.4 MOD MKR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.2.5 CHANNEL
4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.2.6 CHANNEL 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4.2.7 10.7 MHz .................................... 39
OPERATING PROCEDURES
4
5.0 USING THE MODEL 415 SWEEP/MARKER
GENERATOR ...................................... 41
5.1 CONTROLS AND OUTPUTS ......................... 41
5.2 EQUIPMENT INTERCONNECTION AND
SET-UP PROCEDURE .............................. 43
5.3 USE OF MODEL 415 CONTROLS ................... 44
5.4 COMPENSATION FOR POOR LOW FREQUENCY
RESPONSE OF THE OSCILLOSCOPE . . . . . . . . . . . . . . . . 46
5.5 USE OF 100 MHz MARKERS IN
TELEVISION ALIGNMENT .......................... 47
5.6 USING THE CUSTOMER OPTION OSCILLATOR ...... 47
5.6.2 USING THE SPARE MARKER OSCILLATOR AS
A VARIABLE FREQUENCY SOURCE ................. 47
6.0 TELEVISION RECEIVER ALIGNMENT USING
THE MODEL 415 .................................. 48
6.1 SIMPLIFIED PROCEDURE FOR DIAGNOSING
NEED FOR ALIGNMENT ........................... 48
6.2 ANALYZING THE RESPONSE CURVES . . . . . . . . . . . . . . 50
6.3 GENERAL ALIGNMENT INFORMATION ............ 52
6.3.1 LOCALIZING ALIGNMENT PROBLEMS ........ 52
6.3.2 ALIGNMENT METHODS . . . . . . . . . . . . . . . . . . . . . . 53
6.3.2.1 TUNER LINK ......................•... 53
6.3.3.2 I-F ALIGNMENT . . . . . . . . . . . . . . . . . . . . . . 54
6.3.2.3 CHROMA ALIGNMENT . . . . . . . . . . . . . . . . 54
6.3.2.4 RECORDING ALIGNMENT REFERENCE
INFORMATION ....................... 54
7.0 ALIGNMENT TOUCH-UP PROCEDURES ............. 55
7.1 PRELIMINARY ..................................... 55
Page
7.2 TRAP ADJUSTMENTS .............................. 55
7.3 I-F RESPONSE, TILT ADJUSTMENT.
MIXER INJECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
7.4 CHROMA CIRCUIT ADJUSTMENT ................... 56
7.5 TILT ADJUSTMENTS, ANTENNA INJECTION . . . . . . . . 56
8.0 COMPLETE 1-F AND CHROMA ALIGNMENT
PROCEDURE USING THE MODEL 415 .............. 58
8.1 TRAP ALIGNMENT USING MODULATED MARKERS .. 58
8.2 PRE-ALIGNMENT OF I-F BANDPASS COILS AND
TRANSFORMERS (When Specified) . . . . . . . . . . . . . . . . . . 58
8.3 TUNER LINK ALIGNMENT (When Specified) . . . . . . . . 58
8.4 SWEEP ALIGNMENT OF THE 1-F STAGES USING
THE MODEL 415 .................................. 59
8.5 CHROMA CIRCUIT ALIGNMENT ................... 61
8.5.2 BANDPASS AMPLIFIER ALIGNMENT USING
DIRECT VIDEO SWEEP ....................... 61
8.5.3 CHROMA ALIGNMENT USING SIGNAL
INJECTION AT THE ANTENNA TERMINALS OF
THE RECEIVER OR AT THE MIXER TEST
POINTS ..................................... 61
9.0 ADDITIONAL TELEVISION ALIGNMENT PROCEDURES
USING THE MODEL 415 ........................... 63
9.1 TV SOUND ALIGNMENT .......................... 63
9.1.l USING THE MODEL 415 IN TELEVISION
SOUND ALIGNMENT . . . . . . . . . . . . . . . . . . . . . . . . 63
9.2 AUTOMATIC FINE TUNING (AFT) .................. 64
9.2.1 OPERATION OF AFT CIRCUITS .............. 64
9.2.2 ALIGNMENT OF AFT CIRCUITS . . . . . . . . . . . . . . 66
9.3 CONDENSED WORK GUIDE ........................ 67
MANUFACTURERS' ALIGNMENT PROCEDURES USING
THE MODEL 415
10.0 INTRODUCTION ................................... 69
10.l ALIGNMENT OF MAGNAVOX MODEL T933 ........ 69
10.2 ALIGNMENT OF THE PHILCO-FORD
"S" LINE
COLOR TELEVISION RECEIVER . . . . . . . . . 73
11.0 OTHER USES OF THE MODEL 415 .................. 78
11.l ALIGNMENT OF FM RECEIVERS USING THE
MODEL 415 ....................................... 78
11.1.1 10.7 MHz 1-F ALIGNMENT .................. 78
11.1.2 CHECKING FM RECEIVER TRACKING ...... 79
11.2 VARIABLE FREQUENCY GENERATOR CALIBRATION 81
11.2.7 USING HARMONIC RELATIONSHIP
TO CALIBRATE VARIABLE FREQUENCY
GENERATORS .............................. 82
11.3 AM BROADCAST RECEIVER TUNING AND
TRACKING CHECKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
11.4 ADDITIONAL USES OF THE MODEL 415 ............ 82
MODEL 415 ADJUSTMENTS AND MAINTENANCE
12.0 MAINTENANCE AND ADJUSTMENT PROCEDURES .. 83
12.1 TROUBLESHOOTING INFORMATION AND
PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
12.1.1 INTERCONNECTING CABLES, TEST LEADS
AND SWITCHES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
12.1.2 REGULATED POWER SUPPLIES AND BIAS
SUPPLIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
12.1.3 HORIZONTAL SWEEP CIRCUITS ............. 84
12.1.4 PATTERN AMPLIFIER CIRCUITS
(Ql9 and Q20) .............................. 84
12.1.5 MARKER DETECTORS AND AMPLIFIERS ..... 85
12.1.6 VIDEO IF/RF ATTENUATOR Q306 ........... 85
12.2 USE OF MAINTENANCE INFORMATION IN
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
12.3 REPLACEMENT OF DEFECTIVE COMPONENTS . . . . . . 85
12.4 INTERNAL ADJUSTMENT PROCEDURES ............ 86
12.4.1 MARKER OSCILLATOR ADJUSTMENTS ....... 86
12.4.2 CHANNEL
4 OSCILLATOR ADJUSTMENT ..... 86
12.4.3 CHANNEL 10 OSCILLATOR ADJUSTMENT ... 86
12.4.4 PIX OSCILLATOR ADJUSTMENT (Bottom Cover
of Model 415 Removed) ...................... 86
12.4.5 USING THE SPARE MKR OSCILLATOR ....... 86
12.4.5.1 USING THE SPARE MKR OSCILLATOR
AS A CRYSTAL-CONTROLLED MARKER
OSCILLATOR ....................... 87
12.4.5.2 USING THE SPARE MARKER AS A
VARIABLE FREQUENCY SOURCE . . . . 87
12.4.5.3 CALIBRATION OF THE SPARE MKR
OSCILLATOR FOR VARIABLE
FREQUENCY OPERATION ........... 88
12.4.6 BALANCING SWEEP OUTPUTS OF
HORIZONTA,L
SWEEP AMPLIFIER Ql4 ..................... 88
12.4.7 ADJUSTMENT OF SWEEP OSCILLATOR
V ARACTOR BIAS . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
12.4.8 SWEEP LINEARITY ADJUSTMENT . . . . . . . . . . . . 88
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