Grundig R 23 DPL, Service Manual

Page: 20 / 24

GRUNDIG Service GRUNDIG Service
Platinenabbildungen und Schaltpläne / Layout of PCBs and Circuit Diagrams Platinenabbildungen und Schaltpläne / Layout of PCBs and Circuit Diagrams R 23 DPL R 23 DPL
3 - 16 3 - 17
IC-Block-Diagramme
IC Block Diagrams
Schaltplan / Circuit Diagram
FM Front-End
(Tuner-Platte Seite 3-12 / Tuner Board Page 3-12)
C1 C2 C2
C3
C6
C15
Q1 Q2
Q5
Q4
Q3
IFT
C16
C21
C22
R10 R17
R18
R25
R19
C4 C5
C7
C8
C10
C1
1
C12
C17
R20
C9
C13 C14
D1
D2 D3
R1
R2 R3
R4
R5 R6
R7
R8
R15
C20
C23
C24
C18
C19
R12
R13 R14
R1
1
L7
D4
R16
L3 L4
L6 L5
R9
L2
L1
6
5
3
4
2
1
7
8
IF OUT
OSC OUT
+B
VT
AGC
GND
GND
ANT
L1
L2
L3
L-COM1
L4
L5
L6
L-COM2
L7
L8
LCOM3
ST
28 VDD
1 VEE
RCOM3
DATA
CONTROL PART
NJU 7312
CK
14 VSS
2
3
4
5
27 R1
26 R2
25 R3
24 R-COM1
23 R4
22 R5
21 R6
20 R-COM2
19 R7
18 R8
16
15
13
6
7
8
9
10
11
12 17
LEVEL LA
TCH
LEVEL LA
TCH
REVERENCE
DIVIDER
SWALLOW COUNTER
1/16, 1/17 4bits
12 bits PROGRAMMABLE
DIVIDER
1/2
DATA SHIFT REGISTER
LATCH
I/F
21
17
6
5
4
3
15
16
22
1
VSS
VDD
DO
CL
DI
CE
AM IN
FM IN
XOUT
XIN 10
19
20
12 12
PD
A IN
A OUT
IF IN
13 11 10 9 8 7
IO2 IO1 BO4 BO3 BO2 BO1
LC 72131
POWER ON
RESET
UNIVERSAL
COUNTER
UNLOCK
DETECTOR
PHASE DETECTOR
CHARGE PUMP
FM LEVEL
DET
AM MIX
AM RF
V REG
LA 1851N
ALC
AM OSC
AM IF
FM IF
AGC
AM DET
COMP
IF BUFF
PD
MUTE
TRIG
VCO FF 38KHz
DECODER ST SW
(6dB)
PILOT
DET
LED
DRIVE
FF 19KHz
FF 19KHz
90
°
FM DET
23 12 15 14 17 20 18 19 25 16 4
GND SEP
CONTROL
R L MUTE TU ST
RESET
AM/FM AGC
Smeter
AM SD ADJ FM AFC
30 29
24 1 2 3
VCC
7 5 6 8 9 10 11 13 22 21
28
27
26
0
°
VP1
CLOCK
REGENERATION
AND SYNC
OSZILLATOR
DEVIDER
TESTLOGIC AND
OUTPUT
SELEKTOR SWITCH
QUALITY-
BIT
GENERATOR
COSTAS LOOP
VARIABLE AND
FIXED DIVIDER
CLOCKED
COMPARATOR
BIPHASE
SYMBOL
DECODER
ANTI
ALIASING
FILTER
57KHZ
BANDPASS
(8th ORDER)
RECONSTRUK.
FILTER
REFERENZ
VOLTAGE
DIFFERENTIAL
DECODER
RDCL T57 OSCO OSCI VDDD VSSD TEST TSTLD
SCOUT CIN VSSA VDDA MUX VREF RDDA QUAL
SAA6579T
16 12 13 14 15 9 10 11
1 2 3 4 5 6 7 8
6.3dB 75
Ω
6.3dB 75
Ω
4.45K
4.45K
4.14K
4.14K
20K 20K
20K
20K
20K
20K
6dB AMP 75
Ω
Driver
6dB AMP 75
Ω
Driver
13 11 8
CONT3 CONT4 V +
2 4 7 14
CONT1
CONT2 GND1
V -
10
5
VOUT1
VOUT2
NJM 2279D
12
3
1
VIN1
VIN2
VIN3
TFMT 5380
INPUT
100K
CONTROL
CIRCUIT
BAND
PASS
AGC
2
3
1
VS
OUT
GND
DEMODU-
LATOR
A0
A1
A2
8
7
VSS
1
2
3
4 5
6
VCC
WP
SDA
SCL
PAGE LATCHES
EEPROM
ARRAY
SENSE AMP
R/W CONTROL
YDEC
HV GENERATOR
WP
SCL
XDEC
MEMORY
CONTROL
LOGIC
I/O
CONTROL
LOGIC
SDA
VCC
VSS
IC101 NJU7312
IC102/103/104/203/605/606/803/804/805
MC4558/NJM2068/NJM4558
1 2 3 4 5 6 7 8
B
+ +
A
OUT -IN +IN V- +IN -IN OUT V+
MC4558
NJM2068
NJM4558
IC601 LC72131
IC604 NJM2279
IC602 LA1851N
IC603 SAA6579T
IC702 24LC01B/02B
IC704 TFMT5380
1 2 3 4 5 6 7 8
B
+
+
A
OUT -IN +IN V- +IN -IN OUT V+
9
KA4558S
IC202/204 KA4558S
Front-End
FE602 (FT4-460V)