Motorola trr 7 service manual
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Extracted text from motorola trr 7 service manual (Ocr-read)
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Inn-7
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Page 2
TABLE OF CONTENTS
INTRODUCING THE TR R-7 REMOTE CONTROL SYSTEM ....................... 1
FEATURES .................................................... 1
A FEW BASIC FACTS ABOUT FIELD EFFECT TRANSISTORS .................... 2
THE JFET ............................................. 2
THE IGFET ............................................. 3
THE DUAL IGFET ........................................ 6
A FEW IMPORTANT CHARACTERISTICS .......................... 7
SERVICING JFETS ........................................ 7
SERVICING IGFETS ....................................... 8
THE TRR-7 CIRCUIT DESCRIPTION .................................... 9
THE MEMORY MODULES .................................... 9
HOWTHE SET IS TURNED 0N ................................. 11
HOW AUDIO IS CONTROLLED ................................ 12
HOW HUE IS CONTROLLED .................................. 13
HOW INTENSITY IS CONTROLLED .............................. 14
HOW THE FUNCTION DISCRIMINATOR WORKS ..................... 14
THE AUDIO DISCRINIINATOR ................................. 15
THE INTENSITY DISCRIMINATOR .............................. 16
THE PRE-AMPLIFIER ...................................... 16
THE ALL-FUNCTION DRIVER ................................. 17
HOW CHANNELS ARE CHANGED ............................... 18
THE POWER SUPPLY ...................................... 18
THE FRONT PANEL SWITCHES ................................ 19
MUTING .............................................. 19
HOW THE REMOTE SIMULATOR WORKS .......................... 19
THE REMOTE TRANSMITTER ................................. 20
TROUBLESHOOTING HINTS ......................................... 21
DEAD SET ............................................. 21
FUNCTION LOSS ......................................... 22
HOW TO DETERMINE IF LOSS OF FUNCTION IS DUE TO THE RECEIVER
OR THE REMOTE SYSTEM ............................... 23
14-POINT CHECK-UP ....................................... 24
SOME ADDITIONAL SERVICE AIDS .................................... 26
FUNCTIONAL DIAGRAM .................................... 28
EVENT CHARTS 1 THRU 9 ................................... 27
AC WIRING DIAGRAM ..................................... 32
REMOTE CONTROL FREQUENCY-BUTTON DIAGRAM ................. 32