Grundig R 21 Serviceanleitung Seite 17

R 21 / R 22 DPL
Verdrahtungsplan R 21 / Wiring Diagram R 21
GRUNDIG Service
Platinenabbildungen und Schaltpläne / Layout of PCBs and Circuit Diagrams R 21 / R 22 DPL
IC-Block-Diagramme / IC Block Diagrams
IC602 LA1851N
24 1 2
26 AM MIX FM IF
FM LEVEL
27 AM RF AM OSC
DET
28 V REG ALC AM IF
LA 1851N
29 30 4
FM AFC
IC603 SAA6579T
QUAL RDDA
1 2
DIFFERENTIAL
DECODER
BIPHASE
SYMBOL
DECODER
QUALITY-
BIT
GENERATOR
CLOCK
REGENERATION
AND SYNC
16 15
RDCL T57
IC704 TFMT5380
CONTROL
INPUT
CIRCUIT
BAND DEMODU-
AGC
PASS LATOR
TFMT 5380
IC702 24LC01B/02B
A0 1 8 VCC
A1 2 7 WP
A2 3 6 SCL
VSS 4 5 SDA
3 - 8 GRUNDIG Service
Platinenabbildungen und Schaltpläne / Layout of PCBs and Circuit Diagrams
VCC
3 7 5 6 8 9 10 11 13 22
PILOT LED
TRIG
FM DET
DET DRIVE
AGC COMP PD VCO FF 38KHz
AM DET IF BUFF MUTE DECODER
(6dB)
16 25 19 18 20 17 14 15
AM SD ADJ AGC AM/FM TU ST MUTE L R
Smeter RESET CONTROL
VREF MUX VDDA VSSA CIN SCOUT
3 4 5 6 7 8
VP1
REFERENZ
VOLTAGE
ANTI 57KHZ
RECONSTRUK.
ALIASING BANDPASS
FILTER
FILTER (8th ORDER)
COSTAS LOOP
CLOCKED
VARIABLE AND
COMPARATOR
FIXED DIVIDER
TESTLOGIC AND
SAA6579T
OSZILLATOR
OUTPUT
DEVIDER
SELEKTOR SWITCH
14 13 12 11 10 9
OSCO OSCI VDDD VSSD TEST TSTLD
IC604 NJM2279D
CONT3 V + CONT4
13 8 11
2 VS
VIN1 12
20K
3 OUT
VIN2 3
20K 4.14K
20K
1 GND
VIN3 1
20K
20K 20K
2 4 7
CONT1 CONT2 GND1
WP
HV GENERATOR
EEPROM
I/O MEMORY
CONTROL CONTROL XDEC ARRAY
LOGIC LOGIC
PAGE LATCHES
SDA SCL YDEC
VCC
VSS
SENSE AMP
R/W CONTROL
21
FF 19KHz
0°
FF 19KHz
90°
ST SW
12 23
SEP GND
6dB AMP 75Ω Driver
6.3dB 75Ω 10 VOUT1
4.45K
6dB AMP 75Ω Driver
5 VOUT2
6.3dB 75Ω
4.45K
4.14K
NJM 2279D
14
V -
3 - 9