Teac EU3242ST, Service Manual

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AK45 Service Manual 01/12/2003
25 GNDD SUPPLY X Digital Ground
26 RSW2 OUT GNDAB Range Switch 2 for Measurement ADC
27 RSW1 OUT GNDAB Range Switch 1 for Measurement ADC
28 SENSE IN GNDAB Sense ADC Input
29 GNDM SUPPLY X Ground, MADC ı nput
30 VERTQ OUT LV Inverted Vertical Sawtooth Output
31 VERT OUT LV Vertical Sawtooth Output
32 E/w OUT LV Vertical Parabola Output
33 XREF IN X Reference Input for RGB DACs
34 SVMOUT OUT VSUPAB Analog Scan Velocity Modulation Output
35 GNDAB SUPPLY X Analog Ground Backend
36 VSUPAB SUPPLY X Analog Supply Voltage (5.0V) Backend
37 ROUT OUT VSUPAB Analog Red Output
38 GOUT OUT VSUPAB Analog Green Output
39 BOUT OUT VSUPAB Analog Blue Output
40 VRD IN X DAC Reference
41 RIN IN GNDAB Analog Red Input
42 GIN IN GNDAB Analog Green Input
43 BIN IN GNDAB Analog Blue Input
44 FBLIN IN GNDAB Fast Blank Input
45 RIN2 IN GNDAB Analog Red Input2
46 GIN2 IN GNDAB Analog Green Input2
47 BIN2 IN GNDAB Analog Blue Input2
48 FBLIN2 IN GNDAB Fast Blank Input2
49 CLK20 OUT LV 20.25 MHz System Clock Output
50 HOUT OUT X Horizontal Drive Output
51 XTAL 1 IN X Analog Crystal Input
52 XTAL 2 OUT X Analog Crystal Output
53 CIN 2/CRIN LV Analog Chroma 2/Component C
R
Input
54 CBIN IN LV Component C
B
Input
55 GNDAF SUPPLY X Analog Ground Frontend
56 SGND IN GNDAF Signal Ground for Analog Input
57 VRT IN X Reference Voltage Top, Video ADC
58 VSUPAF SUPPLY X Analog Supply Voltage (5.0V) Frontend
59 VOUT OUT LV Analog Video Output
60 CIN1 IN VRT Analog Chroma 1 Input
61 VIN1 IN VRT Analog Video 1 Input
62 VIN2 IN VRT Analog Video 2 Input
63 VIN3 IN VRT Analog Video 3 Input
64 VIN4 IN VRT Analog Video 4 Input
13.5.TEA6415C
13.5.1.General Description
The main function of the IC is to switch 8 video input sources on 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 synch. 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, 5 V
DC
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 75
Ω load needs an external transistor. It is possible to have the same input connected to
several outputs. The starting configuration upon power on (power supply: 0 to 10V) is undetermined. In
this case, 6 words of 16 bits are necessary to determine one configuration. In other case, 1 word of 16
bits is necessary to determine one configuration.
13.5.2.Features
• 20MHz Bandwidth
• Cascadable with another TEA6415C (Internal address can be changed by pin 7 voltage)
• 8 Inputs (CVBS, RGB, MAC, CHROMA,...)
• 6 Outputs
• Possibility of MAC or chroma signal for each input by switching-off the clamp with an external resistor
bridge
• Bus controlled