Comb Filter - Zenith H19F34DT Series Service Manual

1 2
G
F
Subcarrier Signal
FSC
E Chroma Comb(C-IN)
Luma Comb (Y-IN)
Composite Video

"Comb Filter"

CV-COMB R2400
1K
CM2400
This schematic refers to
PROV
CL Chassis models 50V
D
H19F34DT
H20F34DT
H25F34DT
H25F39DT
H27F34DT
H27F39DT
C
H25F36DT
H27F36DT
H32F36DT
WFFSC
3.584 Mhz
B
50.0 nS
A
SR25-3828VD0171B
Comb Filter Circuit
3 4
W2450
P/L
+8V
SW
L2405
10µH
C2414
47µF
16V
CM2404
CM2401
12pF
50V
Q2400
RM2401
0TR945009AA
KSC945C-Y
22K
C
L2400 RM2403
B
22µH 100
E
CM2402 C2406
CM2403
RM2402
27pF
27pF
2.7K
50V
50V 1µF
50V
RM2404
1K
CM2407
+5V
CMB
L2401
100µH
C2409
47µF
16V
WITH NO
COMB COMB
JM2450 OUT IN
JM2451 OUT IN
JM2452 OUT IN
JM2453 OUT IN
CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER "X" IN THEIR
COMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.
5 6
+5V
CMB
L2403
100µH
CM2411
C2412
0.01
47µF
25V
16V
IC2400
0ICTMTO004A
TC90A45P
1 16
AVDD
AVSS
2 15
VRB YOUT
0.01
25V
CM2405 CM2426
JM2451
3 14
VRT BIAS2 P/L
0.01 0.01
25V 25V
RM2406
4 13
ADIN COUT
100
CM2418
5 12
BIAS1 BIAS3
0.01 0.01
25V 25V
CM2417
RM2405
6 11
TEST VFIL
820
0.01
25V
CM2416
7 10 180pF
UIHER CVIN
50V
WFFSC
8 9
DVDD DVSS
CM2408
PROV
50V
+9V ICX3820 +5V
SW CMB
0IKE780500P
5V
KIA78L05BP(AT)
150mA
FRX3820
IN OUT +5VCMB
GND
5.6
GND CX3821
CMX3820
1/2W
220µF
0.1
10V
16V
6-11
7 8
COMB FILTER MODELS ONLY
C
RM2412
B Q2402
PROV
100
E
JM2453 RM2414 L2407
RM2415 B
100
0 971-16
0
RM2413
CM2422 CM2423
PROV
PROV PROV
50V 50V
Q2401
C
PROV
B
E
JM2452 RM2410
L2406 RM2409
B
JUMPER 100
0
0
CM2419
CM2420
RM2411
PROV
PROV
PROV
50V
50V RM2407
CM2415 R2418
4.7K
120pF
50V
RM2419
6.8K
ALL SYMBOLS WITH "M" ON THE DESIGNATOR
INDICATE SURFACE MOUNTED COMPONENT.
9 10
+8V
SW
L2402
10µH
C2410
47µF
16V
NO WITH
COMB COMB
C
Q2403 RM2416 JMP 390
0TR945009AA
RM2417 820 750
KSC945C-Y
E
RM2407 180 220
CM2424
RM2416
PROV
P/L
50V
LUMA-COMB
RM2417
P/L
+8V
SW
L2404
10µH
C2413
47µF
16V
Q2404
C
0TR945009AA
KSC945C-Y
E
CM2421
PROV
P/L
50V
CHROMA-COMB
RM2408
820
FSC
FSC FSC
NOTE: FOR NO-COMB MODELS
W2450, RM2412, JM2453,
JUMPER
RM2414, L2407, JM2451,
JM2452, RM2410, L2406
RM2413, CM2422, CM2423,
OMIT RM2411, CM2419, CM2420,
Q2401, Q2402