Sharp 32JF-76E, Service Manual

Page: 54 / 88

QS
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handbook, full pagewidth
MHC108
DIGITAL VCO CONTROL AFC DETECTOR RC VCO
VIF-PLL
VIF-AGC TUNER AGC
SUPPLY SIF AGC
AUDIO PROCESSING
AND SWITCHES
NARROW-BAND
FM-PLL DEMODULATOR
SINGLE REFERENCE QSS MIXER
INTERCARRIER MIXER
AND AM DEMODULATOR
SOUND TRAPS
4.5 to 6.5 MHz
TAGC
CVAGC(pos)
CAGC(neg)
CBL
VAGC
(1)
TOP
14 (15)
VPLL
19 (21) 9 (8) 16 15 (16) 21 (23)
4 (2) 10 (9) 11 (10)
12 (11) 18 (20) 20 (22)
2 (31)
1 (30)
(18) 17
(7) 8
(3) 5
(4) 6
external reference signal
or 4 MHz crystal
REF AFC
AUD
CVBS
audio output
video output: 2 V (p-p)
[1.1 V (p-p) without trap]
CAF
SIOMAD SDA SCL
MAD
VP
CAGC
(6, 12, 13, 14, 17,
19, 25, 28, 29, 32)
13
n.c. AGND
7 (5)
DGND
OUTPUT
PORTS
I
2
C-BUS TRANSCEIVER
22 (24) 3 (1)
OP1 OP2 FMPLL
DEEM
AFD
sound intercarrier output
and MAD select
FM-PLL
filter
VIF-PLL
filter
de-emphasis
network
VIF2
VIF1
24 (27)
23 (26)
SIF2
SIF1
TDA9885
TDA9886
Fig.1 Block diagram.
(1) Not connected for TDA9885.
Pin numbers for TDA9885HN in parenthesis.
2-6O__(*
T13#:!W
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