Realistic PRO-2020 - Table of Contents

CONTENTS
SPECIFICATIONS .
PRINCIPLES OF OPERATION .
DISASSEMBLY DIAGRAM " . . .•. . . . .. ..
BLOCK DIAGRAM .
GENERAL OPERATION OUTLlNE .
ALlGNMENT
ALlGNMEN T AND TEST POINT POSITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 (
ALlGNMENT PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . 8
REFERENCE FREQUENCY OSC ALlGNMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
IF SECTION ALlG NMENT. . ..
.. ... . . . . . . . . . . ... . . . ....... . . . . . . . . . .. ... . . . .. . . . . 9
VCO ALIGNMENT . ..
.... . . . ... . . . . . . . . ... .. . . . . • ... .. .. . . .. . . . .. . . . .... .. . . . . . 9,10
RF AMP
ALlGNMENT 10,11
OVERALL ALlGNMENT AND SENSITIVITY MEASUREMENT ... . •. .. 12
!EROMATIC FUNCTION AND HOW TO CHECK
IT.. .. .. ......... .... ........... .. 12
RESET TIMING (IC·1) .. . . 13
CPU CLOCK OSCILLATION WAVEFORM (lC-1)
... . ... .. . . .. ..... . .. . ..... . .. ... .. .... 13
IC-3 INPUT/OUTPUT WAVEFORM .
... . .. ... . . . .. . ... .... . . ... .. . . . . . . . . ... . . .. .. .. .. 13
IC·4 INPUT/OUTPUT TIME
CHART.. . . . . . . . . . . • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
IC·6 INPUT/OUTPUT TIME CHART.
... . . . .. . 15
. PLL CLOCK AND DATA INPUT WAVEFORMS (lC -8).... . . ........ .. . . .. ... ... . . . .. ... . 16
MEMORY CHECK . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
RECEPTION CHECK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
WIRING DIAGRAM .. . . .
... .. .. . . . . 19
PRINTED ClRCUIT BOARD
L1NEAR P.C. BOARD (TOP ViEW)
.... .. . .. .. 20
L1NEAR P.C. BOARD (BOTTOM ViEW). . .. . 21
LOGIC P.C. BOARD (TOP
ViEW).. .. . . . . 22
LOGIC P.C. BOARD (BOTTOM VIEW) 23
TROUBL ESHOOTING. . . . . . . . . . . . . . . . . . • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24,25
INTEGRATED CIRCUIT LEAD IDENTIF ICATION
26 - 30
SEMICONDUCTOR LEAD IDENTIFICATION 31
DIODE IDENTIFICATION AND POLARIT Y ..
.. . .. ... .. . . .. . .. .. .. .. .. .. .... .. .. .. .. .. 32
MICRO-COMPUTER (IC-1) PORT FORMAT . .. .. . .. . .. . . . .
..... 33
PARTS LIST 34
- 40
APPENDIX FOR VHF-MlD BAND FOR EUROPEAN/AUSTRALIAN MODELS
..... 41,42
EXPLODED
ViEW... ... . . ..... .. 43
SCHEMATIC DIAGRAM (LOGIC SECTION) .
44,45
SCHEMATIC DIAGRAM (Li NEAR SECTION) .. 46,47