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The system switches (S1 -S1 O) are used for multi-standard
model.
(Refer to the block diagram of system switching circuit on previous page)
SI :
S2:
S3:
S4 :
S5 :
S6:
S7:
S8:
S9:
Switch for band-limiting
on NTSC(3.58)
mode (Dl 06)
This switch is driven by ON/OFF signal from CPU (pin39).
Switch for sound carrier trap on NTSC(3.58)
mode (Dl 20)
This switch is driven by signal from CPU (pin39).
Switch for sound carrier trap except NTSC(3.58)
mode (D I 21 )
This switch is driven by inverting signal from CPU (pin39).
System switch for forced SECAM mode (Q203)
This switch is driven by ON/OFF signal from CPU (pin40).
System switch for forced 4.43 mode (Q222)
This switch is driven by ON/OFF signal from CPU (pin43).
Note: When the colour system is set to "AUTO", both S6 and S7 will turn on.
System switch for forced 3.58 mode (Q221 )
This switch is driven by ON/OFF signal from CPU (pin42).
System switch for 4.5 MHz filtering on NTSC(3.58)
mode (Ql 52)
This switch is driven by ON/OFF signal from CPU (pin39).
System switch for 5.5 MHz filtering on B/G mode (Ql 54)
This switch is driven by ON/OFF signal from CPU (pin38).
System switch for 6.OMHZ filtering on I mode (Ql 55)
This switch is driven by ON/OFF signal from CPU (pin37).
S1O: System switch for 6.5 MHz filtering on D/K mode (QI 56)
This switch is driven by ON/OFF signal from CPU (pin36).
Note: When the TV system is set to "AUTO", S7, S8, S9 and S1 O will turn on.
-21-
AA1-A
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