Daewoo TVZ 1321 Service Manual page 47

• All signal flow is same to TVZ1321(2HD).
• But, the difference between TVZ1321(2HD) and TVZ1341(4HD) is EP(SLP) Recording.
• In case of 2HD, SP(H) & SP(L) heads are operated.
• In case of 4HD, EP(H) & EP(L) heads are operated.
3. PB mode
• In the case of SP, the signals on pins #17, #20 of IY03(LA7411) are amplified to 60dB respectively and are output
to pin #7 IY03 and is routed to pin #4 IY01(LA7423A)
• The FM signal input to pin #14 of IY01 where it is at FM DEMODULATED after passing through FM EQ. within IC
and then is routed to the Y/C MIXER after passing through 3.0MHz LPF.
• The FM signal at pin 14 of IY01 is passed through the 1.3MHz LPF to allow only the low frequency chroma signals
to pass through.
• The color signal is converted to 3.58MHz at Main CONVERTER and is routed to the Y/C MIXER after being ampli
fied 6dB and then goes through ACC/BURST EMPHASIS. The Y/C signal is output at pin #28.
3-1. PB Mode ( TVZ1321 : 4HD)
• All signal flow is same to TVZ1321(2HD).
• Pin number of LA7416 is differ from LA7411.
• But special playback case, in example Que, Review, Still, Slow, Some signals are needed.
• H.A switching and comp out and color Rotary.
• In case of 2HD, only 2 heads are operated, But in case of 4HD, 4 heads are operated.
• Above 3 signals are input and output through multiplexer IC(refer from TC4053BP).
• Comp out is output from LA7416 pin 3.
• This signal can switch SP and EP and detect large RF signal(Envelope).
• Color Rotary signal is exclusive OR Logic function of H.A sw and comp out.
• If these signals are correct, special playback function is normally operated.
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