Universum FT-81015, Service Manual

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31. Scart input 1 in, left 50. Scart output 2, left
32. Analog Shield Ground 1 51. Scart output 2, right
33. Scart input 2 in, right 52. Analog Shield Ground 3
34. Scart input 2 in, left 53. Not connected
35. Analog Shield Ground 2 54. Not connected
36. Scart input 3 in, right 55. Not connected
37. Scart input 3 in, left 56. Analog output Channel 1, left
38. Analog Shield Ground 4 57. Analog output Channel 1, right
39. Not connected 58. Reference ground 2 high voltage part
40. Not connected 59. Analog output Channel 2, left
41. Not connected 60. Analog output Channel 2, right
42. Analog reference voltage high voltage part 61. Power-on-reset
43. Analog ground 62. Not connected
44. Volume capacitor Channel1 63. Not connected
45. Analog power supply 8.0 V 64. I2S2-data output
46. Volume capacitor Channel 2 65. I2S2-data input
47. Scart output 1, left 66. Digital ground
48. Scart output 1, right 67. Digital power 5 V
49. Reference ground 1 high voltage part 68. Not connected
HEADPHONE OUTPUT
TDA1308
The TDA1308 is an integrated class AB stereo headphone driver. It gets its input from two analog audio outputs (DACA_L
and DACA_R) of MSP3410D. The gain of the output is adjustable by the feedback resistor between the inputs and outputs.
Features:
n Wide temperature range
n No switch ON/OFF clicks
n Excellent power supply ripple rejection
n Low power consumption
n Short-circuit resistant
n High performance - high signal-to-noise ratio
- high slew rate
- low distortion
n Large output voltage swing
Pinning:
1. Output A (Voltage swing) : Min : 0.75V, Max : 4.25V
2. Inverting input A : Vo(clip) : Min : 1400mVrms
3. Non-inverting input A : 2.5V
4. Ground
5. Non-inverting input B : 2.5V
6. Inverting input B : Vo(clip) : Min : 1400mVrms
7. Output B (Voltage swing) : Min : 0.75V, Max : 4.25V
8. Positive supply : 5V, Min : 3.0V, Max : 7.0V
AUDIO OUTPUT
TDA7265
The TDA7265 is a 25W+25W stereo sound amplifier with mute/stand-by facility. STPA control signal coming from microcontroller
(when it is at high level) activates the mute function. IC is muted when mute port is at low level. Two stereo audio signals
coming from audio module is injected to the inputs of the IC and a power of 12Wrms (10%) is obtained. An external pop-
noise circuitry pulls AF inputs of the IC in order to eliminate pop noise when TV is turned on or off via mains supply
connection. It is possible to adjust the gain of the amplifiers by feedback external resistors.
Features:
n Wide supply voltage range (up to 50V ABS Max.)
n Split supply
n High output power: 25+25 W @ TDA = 10%, RL = 8ohm, VS = ±20V
n No pop at turn-on / off
n Mute (pop free)
n Stand-By feature (low IQ)
n Few external components
n Thermal overload protection
n Adjustable gain via an external resistor