Grundig R 21 Serviceanleitung Seite 18

Platinenabbildungen und Schaltpläne / Layout of PCBs and Circuit Diagrams
IC201 TDA7439
MUXOUTL
15
L-IN1 11
L-IN2 12
G
L-IN3 13
L-IN4 14
0/30dB
2dB STEP
R-IN1 10
R-IN2 9
G
R-IN3 8
INPUT MULTIPLEXER
R-IN4 7 +GAIN
17
MUXOUTR
IC601 LC72131
REVERENCE
XIN 1
DIVIDER
XOUT 22
SWALLOW COUNTER
FM IN 16 1/2
1/16, 1/17 4bits
12 bits PROGRAMMABLE
AM IN 15
DIVIDER
CE 3
DI 4
DATA SHIFT REGISTER
I/F
LATCH
CL 5
DO 6
POWER ON
VDD 17
RESET
VSS 21
7 8 9 10 11 13
BO1 BO2 BO3 BO4 IO1 IO2
IC503 LC7536
L 5dB L 1dB L 1dB R 1dB R 1dB R 5dB
OUT IN OUT OUT IN OUT
5 6 8 23 25 26
L 5dB IN 1
L CT1 3
L CT2 4
L VM 9
LEVEL SHIFT
S 12
CE 19
CONTROL L LATCH
CLK 17
D
D1 18
SHIFT REGISTER
D
3 - 10
INL TREBLE (L) MIN(L) MOUT(L) BIN(L) BOUT(L)
16 27 26 25 23 24
TDA 7439
SPKR ATT
VOLUME TREBLE MODULE BASS 6 LOUT
LEFT
30 SCL
BUS DECODER + LATCHES
1 SDA
29 DIGGND
SPKR ATT
VOLUME TREBLE MODULE BASS 5 ROUT
RIGHT
3 VS
SUPPLY
4 AGND
18 28 19 20 21 22 2
INR TREBLE(R) MIN(R) MOUT(R) BIN(R) BOUT(R) CREF
PHASE DETECTOR
10 PD
CHARGE PUMP
UNLOCK
IC2, IC3, IC5, IC6, IC7, IC202, IC501, IC502
DETECTOR
19 A IN
NJM4558L
20 A OUT
+
A
1 2 3
UNIVERSAL
12 12 IF IN
OUT -IN +IN
COUNTER
LC 72131
IC1 NJU7312
L1 2
L2 3
30 R 5DB IN
28 R CT1
L3 4
L-COM1 5
27 R CT2 L4 6
L5 7
L6 8
22 R VM
L-COM2 9
L7 10
13 VDD
L8 11
21 VCC
LCOM3 12
14 VSS
ST 13
10 VEE
CONTROL PART
VDD 28
VEE 1
NJU 7312
R 21 / R 22 DPL Platinenabbildungen und Schaltpläne / Layout of PCBs and Circuit Diagrams
Blockschaltplan R 22 / Block Diagram R 22
+
B
4 5 6 7 8
V- +IN -IN OUT V+
27 R1
26 R2
25 R3
24 R-COM1
23 R4
22 R5
21 R6
20 R-COM2
19 R7
18 R8
17 RCOM3
16 DATA
15 CK
14 VSS
GRUNDIG Service 3 - 11
R 21 / R 22 DPL
GRUNDIG Service