Zenith XBV 443, Service Manual

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3-64
C244
12p
C245
12p
R237 1M
X201
R2C9
220
86 87
IC202
(STL6317)
The waveform and the block diagram as below show a clock input and output between IC202 and X201.
Clocks generated in X201 is output and input into pin86 and pin87 of IC202.
The clock frequency is 20MHz.
IC 202
pin86
IC 202
pin87
A diagram for a colck input of IC201 The waveform of clock inputs to IC201
17. Input Clock to IC202
IC202
DSP(STL6317)
IC201
Driver IC(L6560)
Pin 38
Pin 39
Pin 1
Pin 2
Tray-open
(LOPEN)
(LCLOSE)
Tray-close
MD
Pin 4
Pin 5
LM-
LM+
DSP send tray - open or tray - close signal to IC201(motor drive IC)
IC201 generates LM+ and LM - and transmits them to operate a loading motor.
if there is no LM+ or LM-, check the Tray-open and Tray-close. And replace the Motor Drive IC .
IC201
pin1
IC201
pin2
A signal flow for tray open and close The waveform input to IC201 for tray open and close
18. Tray Open and Close