HITACHI C28WF560N
Manual de Servicio

EXTERNAL REFERENCE CVAGC(pos) TOP TAGC 9 14 CAGC(neg) TUNER AGC VIF2 2 VIF1 1 VIF-PLL VAGC 16 CBL RC VCO VIF-PLL FILTER VPLL 19

CRYSTAL OR 4MHz

REF 15

AFC 21

VIF AGC

DIGITAL VCO CONTROL AFC DETECTOR

TDA9885 TDA9886

VIDEO TRAPS 4.5~6.5MHz

17

CVBS

VIDEO OUTPUT 2Vp-p (1.1Vp-p without trap) 8 AUD

SIF2 24 SIF1 23

SINGLE REFERENCE QSS MIXER INTERCARRIER MIXER AND AM DE-MODULATOR MAD SUPPLY SIF-AGC CAGC 20 VP 18 13 AGND N.C. 3 OP1 22 OP2 11 SCL 10 7 12 SDA DGND SIOMAD SECOND INTERCARRIER OUTPUT AND MAD SELECT OUTPUT PORTS IIC-BUS TRANSCEIVER

AUDIO PROCESSING 5 DEEM AND SWITCHES DE-EMPHASIS NETWORK NARROW-BAND FM-PLL DETECTOR 6 AFD CAF

4 FMPLL FM-PLL FILTER

(1) Not connected for TDA9885

4.VIDEO SWITCH TEA6415
In case of three or more external sources are used, the video switch IC TEA6415 is used. The main function of this device is to switch 8 video-input sources on the 6 outputs. Each output can be switched on only one of each input. On each input an alignment of the lowest level of the signal is made (bottom of sync. top for CVBS or black level for RGB signals). Each nominal gain between any input and output is 6.5dB.For D2MAC or Chroma signal the alignment is switched off by forcing, with an external resistor bridge, 5VDC on the input. Each input can be used as a normal input or as a MAC or Chroma input (with external Resistor Bridge). All the switching possibilities are changed through the BUS. Driving 75ohm load needs an external resistor. It is possible to have the same input connected to several outputs.

5.MULTI STANDARD SOUND PROCESSOR
The MSP 34x10G family of single-chip Multi-standard Sound Processors covers the sound processing of all analog TV-Standards worldwide, as well as the NICAM digital sound standards. The full TV sound processing, starting with analog sound IF signal-in, down to processed analog AF-out, is performed on a single chip. The DBX noise reduction, or alternatively, MICRONAS Noise Reduction (MNR) is performed alignment free. Other processed standards are the Japanese FM-FM multiplex standard (EIA-J) and the FM Stereo Radio standard.

6.SOUND OUTPUT STAGE WITH TDA7269A
The TDA7269A is class AB dual Audio power amplifier assembled in the Multi-watt package, specially designed for high quality sound application as Hi-Fi music centers and stereo TV sets.

7.BERTICAL OUTPUT STAGE WITH STV9379FA
The IC STV9379FA is the vertical deflection booster circuit. Two supply voltages, +14V and �14V are needed to scan the inputs VERT+ and VERT-, respectively. And a third supply voltage, +60V for the flyback limiting are needed. The vertical deflection coil is connected in series between the output and feedback to the input.

8.VIDEO OUTPUT AMPLIFIER TDA6108
The TDA6108Q includes three video output amplifiers is intended to drive the three cathodes of a colour picture tube. 2 No. 0113 Service Manual