Tuner - Grundig Davio 20 Service Manual

GRUNDIG Service
Hauptplatte / Main Board – Tuner
5 6 7
TOP
9 ( ) 8
TUNER AGC
2 (31)
VIF2
1 (30)
VIF1
24 (27)
SIF2
23 (26)
SIF1
SUPPLY
20 (22)
V P
2 - 
(1)
TAGC VAGC VPLL (1) Not connected for TDA9885.
14 (15) 1 6 1 ( ) 7 19 (21)
C AGC(neg)
C BL
VIF-AGC RC VCO
VIF-PLL
SINGLE REFERENCE QSS MIXER
INTERCARRIER MIXER
AND AM DEMODULATOR
MAD
OUTPUT
2
SIF-AGC I C-BUS TRANSCEIVER
PORTS
C AGC
(6, 12, 13, 14, 17,
19, 25, 28, 29, 32)
13 11 (10)
18 (20) 3 (1) 22 (24)
AGND n.c. O P 1 O P 2 SCL SDA
Chassis LX
$
REF AFC
1 5 1 ( ) 6 2 1 2 ( ) 3
DIGITAL VCO CONTROL AFC DETECTOR
SOUND CARRIER
(18) 17
TRAPS
4.5 to 6.5 MHz
TDA9885
TDA9886
AUDIO PROCESSING
AND SWITCHES
NARROW-BAND
FM-PLL DEMODULATOR
10 (9) 4 (2)
7 (5) 12 (11)
DGND SIOMAD F M P L L
CVBS
(7) 8
AUD
(3) 5
DEEM
(4) 6
AFD