Grundig R 23 DPL Serviceanleitung Seite 20

Platinenabbildungen und Schaltpläne / Layout of PCBs and Circuit Diagrams
Schaltplan / Circuit Diagram
FM Front-End
(Tuner-Platte Seite 3-12 / Tuner Board Page 3-12)
Q1
C1 C2 C2 C6
L2
ANT 1
C3
D2
D1
L4
L3
GND 2
GND 4
C15 C16
R9 R10
AGC 3
VT 5
+B 6
Front-End
FE602 (FT4-460V)
IC-Block-Diagramme
IC Block Diagrams
IC101 NJU7312
L1 2 27
L2 3 26
L3 4 25
L-COM1 5 24
L4 6 23
L5 7 22
L6 8 21
L-COM2 9 20
L7 10 19
L8 11 18
LCOM3 12 17
ST 13 16
CONTROL PART
VDD 28 15
VEE 1 14
NJU 7312
IC102/103/104/203/605/606/803/804/805
MC4558/NJM2068/NJM4558
MC4558
NJM2068
NJM4558
+ +
A B
1 2 3 4 5 6 7 8
OUT -IN +IN V- +IN -IN OUT V+
IC202/204 KA4558S
KA4558S
+ +
A B
1 2 3 4 5 6 7 8 9
OUT -IN +IN V- +IN -IN OUT V+
3 - 16
Q2
7 IF OUT
C9
L5 L6
D3
IFT
R18
R17
R19
8 OSC OUT
R25
Q3
Q4
C21 Q5
C22
D4
L7
IC601 LC72131
REVERENCE
XIN 1
R1
DIVIDER
R2
XOUT 22
R3
SWALLOW COUNTER
FM IN 16 1/2
1/16, 1/17 4bits
R-COM1
R4
12 bits PROGRAMMABLE
AM IN 15
DIVIDER
R5
R6
CE 3
R-COM2
DI 4
DATA SHIFT REGISTER
I/F
LATCH
R7
CL 5
R8
DO 6
POWER ON
VDD 17
RCOM3
RESET
VSS 21
DATA
7 8 9 10
CK
BO1 BO2 BO3 BO4
VSS
IC604 NJM2279
CONT3 V + CONT4
13 8 11
6dB AMP
VIN1 12
6.3dB
20K
VIN2 3
20K 4.14K
20K
6dB AMP
6.3dB
VIN3 1
20K
20K 20K
4.14K
2 4 7
CONT1 CONT2 GND1
GRUNDIG Service
R 23 DPL Platinenabbildungen und Schaltpläne / Layout of PCBs and Circuit Diagrams
IC602 LA1851N
24 1 2
26 AM MIX
FM LEVEL
27 AM RF AM OSC
28 V REG ALC
LA 1851N
29 30
FM AFC
PHASE DETECTOR
10 PD
CHARGE PUMP
UNLOCK
DETECTOR
19 A IN
20 A OUT
UNIVERSAL
12 12 IF IN
COUNTER
LC 72131
11 13
IO1 IO2
75Ω Driver
10 VOUT1
75Ω
4.45K
75Ω Driver
5 VOUT2
75Ω
4.45K
NJM 2279D
14
V -
3 - 17
VCC
3 7 5 6 8 9 10 11
PILOT
TRIG
FM IF FM DET
DET
AGC COMP PD
VCO
DET
AM IF AM DET IF BUFF MUTE
(6dB)
4 16 25 19 18 20 17
AM SD ADJ AGC AM/FM TU ST MUTE
Smeter RESET
IC603 SAA6579T
QUAL RDDA VREF MUX VDDA VSSA
1 2 3 4 5
VP1
DIFFERENTIAL
REFERENZ
DECODER
VOLTAGE
ANTI
BIPHASE
ALIASING BANDPASS
SYMBOL
FILTER
(8th ORDER)
DECODER
QUALITY- COSTAS LOOP
BIT
VARIABLE AND
GENERATOR
FIXED DIVIDER
CLOCK
OSZILLATOR SAA6579T
REGENERATION
DEVIDER
AND SYNC
16 15 14 13 12 11
RDCL T57 OSCO OSCI VDDD VSSD
IC702 24LC01B/02B
WP
HV GENERATOR
I/O MEMORY
A0 1 8 VCC
XDEC
CONTROL CONTROL
LOGIC LOGIC
PAGE LATCHES
2 7 WP
A1
A2 3 6 SCL
SDA SCL
4 5 SDA
VSS VCC
VSS
SENSE AMP
R/W CONTROL
IC704 TFMT5380
CONTROL
INPUT
CIRCUIT
BAND
DEMODU-
AGC
PASS
LATOR
TFMT 5380
R 23 DPL
13 22 21
FF 19KHz
LED
DRIVE
0°
FF 19KHz
FF 38KHz
90°
DECODER ST SW
14 15 12 23
L R SEP GND
CONTROL
CIN SCOUT
6 7 8
57KHZ
RECONSTRUK.
FILTER
CLOCKED
COMPARATOR
TESTLOGIC AND
OUTPUT
SELEKTOR SWITCH
10 9
TEST TSTLD
EEPROM
ARRAY
YDEC
2 VS
3 OUT
1 GND
GRUNDIG Service