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¢¡PAL-N system
•If 60[Hz] detected, #21 of the I501 goes up to HIGH level and the system operates as PAL-M or NTSC-M.
¤ In the case that Base voltage of Q705 is LOW, the voltage driven from R766 and R774 is applied to the #28
of the I701.
¤ŁIn the case that Base voltage of Q705 is HIGH, according to the voltage change of the #28 of the I701, the
comparator in the I701 switch over the system.
(PAL-M¢¡NTSC-M, NTSC-M¢¡PAL-M)
•HIGH signal of the #1 of I701 makes X502 oscillates.(NTSC-M)
•HIGH signal of the #2 of I701 makes X503 oscillates.(PAL-M)
3) FREQUENCY CHARACTERISTICS OF EACH SYSTEM
COLOR
VHF
NTSC
M
PAL
M
PAL
M
C. SOUND BLOCK
1. SOUND BLOCK DIAGRAM
SIF
EXT.
12
AUDIO
(JV01/JV02)
2. EXPLANATION OF OPERATION
1) The TV audio signal is detected and goes into the audio switch in I501.
2) The external audio signal from JV01(or JV02) goes into the #12 of I501.
3) The audio switch in I501 alternates audio signals according to the TV/VIDEO control input from the I701.
4) The selected audio signal (#51 of I501) go into the #3 of I601.
SCANNING
UHF
NUMBER
M
525line
M
525line
625line
I501
LA7688
FM
DET
AUDIO
SWITCH
51
LINE
FREQUENCY
FREQUENCY
(Fh)
15,734[Hz]
15,734[Hz]
15,625[Hz]
3
from the µ-COM(#33)
14
CHROMINANCE
FIELD
SUB CARRIER
(Fsc)
60[Hz]
3.579545[MHz]
60[Hz]
3.575611[MHz]
50[Hz]
3.582056[MHz]
I601
TDA7056A
6
8
SP
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