Realistic PRO-2021 - Block Diagram

BLOCK DIAGRAM
CRYSTAL OSC,MIXER,IF AMP
VHF RF AMP MIX
4
(LOW, AIR, HI) FILTER QUADRATURE DET
01,2,3
DI~10,57
XF-1
NOISE
AMP
VRI
1c-2 SOUELCH
UHF RF AMP MIX
Di — ІЗ
Q4,5
AM/FM SW
DET &ANL H
024,25 ІС3,5 (3/6)
017
VCO
(LOW)
VR2
DI4,
15
VOLUME
f
і
|
ZEROMATIC
AUDIO
|
HEADPHONE
& KEY TONE AMP | 6
IC5,6 020,2! ІС-9 !
1
| LV |
І
| [SPEAKER
1
! О
І
} TAPE OUT
EL
DRIVER
s
TIS,
030
”
”
v
arse
<<
(ее
ПИ
(240V)
KEYBOARD
LOW BATT PLL | LOW-PASS | DC-DC CONV
LCD DET FILTER 025,26
CPU
CONTROL
018,19 D26
VOLTAGE
REGULATOR
1C-10
027, 28,29 5-7 022,23,24 036,37 BACK UP
BATT
C) O
SWI
RESET SW