SERVICE MANUAL FOR M35&36; CHASSIS

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TCL Pins 36, AGNDC – Internal Analog Reference Voltage This pin serves as the internal ground connection for the analog circuitry (except IF input). It must be connected to the VREF pins with a 3.3 ⎧F and a 100 nF capacitor in parallel. This pins shows a DC level of typically 3.73 V. Pin 37, 38, NC – Pins not connected. Pins 39, 40, SC2_IN_L/R – SCART2 Inputs (Fig. 4) The analog input signal for SCART2 is fed to this pin. Analog input connection must be AC coupled. Pins 41, 42, SC1_IN_L/R – SCART1 Inputs (Fig. 4) The analog input signal for SCART1 is fed to this pin. Analog input connection must be AC coupled. Pin 43, VREFTOP – Reference Voltage IF AD Converter (Fig. 5) Via this pin, the reference voltage for the IF AD converter is decoupled. It must be connected to AVSS pins with a 10∀F and a 100nF capacitor in parallel. Traces must be kept short. Pin 44, MONO_IN – Mono Input (Fig. 4) The analog mono input signal is fed to this pin. Analog input connection must be AC coupled. Pins 45, AVSS* – Ground for Analog Power Supply Voltage Ground connection for the analog IF input circuitry of the MSP. Pins 46, AVSUP* – Analog Power Supply Voltage P- ower is supplied via this pin for the analog IF input circuitry of the MSP. This pin must be connected to the +5 V supply. Pin 47, ANA_IN1+ – IF Input 1 (Fig. 5) The analog sound if signal is supplied to this pin. Inputs must be AC coupled. This pin is designed as symmetrical input: ANA_IN1+ is internally connected to one input of a symmetrical op amp, ANA_IN. to the other. Chassis M35&36 Service Manual Pin 48, ANA_IN. – IF Common (Fig. 5) This pin serves as a common reference for ANA_ IN1/2+ inputs. Pin 49, NC – Pin not connected Pin 50, TESTEN – Test Enable Pin (Fig. 2) This pin enables factory test modes. For normal operation it must be connected to ground. Pins51, 52, XTAL_INXTAL_OUT – Crystal Input and Output Pins (Fig. 10) These pins are connected to an 18.432 MHz crystal oscillator which is digitally tuned by integrated shunt capacitances. An external clock can be fed into XTAL_IN. The audio clock output signal AUD_ CL_OUT is derived form the oscillator. External capacitors at each crystal pin to ground (AVSS) are required. It should be verified by layout, that no supply current for the digital circuitry is flowing through the ground connection point. * Application Note: All ground pins should be connected to one low- Resistive ground plane. All supply pins should be connected separately with short and low-resistive lines to the power supply. Decoupling capacitors from DVSUP to DVSS, AVSUP to AVSS, and AH- VSUP to AHVSS are recommended as closely as possible to these pins. Decoupling of DVSUP and DVSS is most important. We recommend using more than one capacitor. By choosing different values, the frequency range of active decoupling can be extended. In our application boards we use: 220 pF, 470 pF, 1.5 nF, and 10 ⎧F. The capacitor with the lowest value should be placed nearest to the DVSUP and DVSS pins. 34 03.Mar.2003
TCL Pin Circuits Pin No. Pin Name Type Pin Circuit Fig. 1 Chassis M35&36 Service Manual 20 RESETQ Input Pin Fig. 2 50 TESTEN Input Pin Fig. 3 44 MONO_IN Input Pin 39 40 41 42 SC2_IN_L SC2_IN_R SC1_IN_L SC1_IN_R Input Pin Fig. 4 Fig. 5 43 VREFTOP 47 ANA_IN1+ Input Pin 48 ANA_IN. Fig. 6 5 ADR_SEL Input Pin 12 I2S_DA_IN1 Fig. 7 18 6 I2S_DA_IN2 STANDBYQ Input Pin 35 03.Mar.2003
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SERVICE MANUAL FOR M35&36; CHASSIS

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