DOWNLOAD Sharp 21LF-90H (serv.man3) Service Manual ↓ Size: 1.51 MB | Pages: 44 in PDF or view online for FREE

Model
21LF-90H (serv.man3)
Pages
44
Size
1.51 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / CTR
File
21lf-90h-sm3.pdf
Date

Sharp 21LF-90H (serv.man3) Service Manual ▷ View online

17
AK - 44
CHASSIS
TDA7266/TDA7266L
General Description of TDA7266L
The TDA7266L is a mono bridge amplifier specially designed for TV and Portable Radio applications. Requires very
few external components
WIDE SUPPLY VOLTAGE RANGE (3-18 V)
MINIMUM EXTERNAL COMPONENTS.
– NO SVR CAPACITOR
– NO BOOTSTRAP
– NO BOUCHEROT CELLS
– INTERNALLY FIXED GAIN
STAND-BY & MUTE FUNCTIONS
SHORT CIRCUIT PROTECTION
THERMAL OVERLOAD PROTECTION
Pinnig
1 N.C.
2 N.C.
3 MUTE
4 ST-BY
5 PW-GND
6 S-GND
7 IN
8 VCC
9 OUT+
10 OUT -
General Description of TDA7266
The TDA7266 is a 2x7 Watt dual power amplifier. It is used for sound amplification at stereo TV sets.
WIDE SUPPLY VOLTAGE RANGE (3-18 V)
MINIMUM EXTERNAL COMPONENTS
– NOSWR CAPACITOR
– NOBOOTSTRAP
– NO BOUCHEROT CELLS
– INTERNALLY FIXED GAIN
STAND-BY & MUTE FUNCTIONS
SHORT CIRCUIT PROTECTION
THERMAL OVERLOAD PROTECTION
Pinnig
1. OUT1 +
2. OUT1 –
3. VCC
4. IN1
5. N.C.
6. MUTE
7. ST-BY
8. PW-GND
9. S-GND
10. N.C.
11. N.C.
12. IN2
13. VCC
14. OUT2 -
15. OUT2 +
18
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CHASSIS
TDA8174AW
INDEPENDENT VERTICAL AMPLITUDE ADJUSTMENT. BUFFER STAGE. POWER AMPLIFIER.
FLYBACK GENERATOR. THERMAL PROTECTION. INTERNAL REFERENCE VOLTAGE DECOUPLING.
General Description
TDA8174A and TDA8174AW are a monolithic integrated circuits. It is a full performance and very efficient vertical
deflection circuit intended for direct drive of a TV picture tube in Color and B & W television as well as in Monitor and
Data displays.
Pinning
1. POWER OUTPUT
2. OUTPUT STAGE Vs
3. TRIGGER INPUT
4. HEIGHT ADJUSTMENT
5. VOLTAGE REF DECOUPLING
6. GROUND
7. RAMP GENERATOR
8. BUFFER OUTPUT
9. INVERTING INPUT
10. Vs
11. FLYBACK GENERATOR
TDA6107
Features
· Typical bandwidth of 5.5 MHz for an output signal of 60 V (p-p)
· High slew rate of 900 V/ms
· No external components required
· Very simple application
· Single supply voltage of 200 V
· Internal reference voltage of 2.5 V
· Fixed gain of 50
· Black-Current Stabilization (BCS) circuit with voltage window from 1.8 to 6 V and current window from -100
   mA to 10 mA
· Thermal protection
· Internal protection against positive flashover discharges appearing on the CRT.
General Description
The TDA6107JF includes three video output amplifiers and is intended to drive the three cathodes of a colour CRT
directly. The device is contained in a plastic DIL-bent-SIL 9-pin medium power (DBS9MPF) package, and uses high-
voltage DMOS technology. To obtain maximum performance, the amplifier should be used with black-current control.
Pinning, Pin Value
1. BLUE INPUT
2. VCC LOW VOLTAGE
3. GREEN INPUT
4. RED INPUT
5. VDD HIGH VOLTAGE
6. RED CATHODE CURRENT
7. RED OUTPUT
8. GROUND
9. RED FEEDBACK
10. GREEN OUTPUT
11. GREEN CATHODE CURRENT
12. GREEN FEEDBACK
13. BLUE OUTPUT
14. BLUE CATHODE
15. BLUE FEEDBACK
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CHASSIS
MC44608
General description
The MC44608 is a high performance voltage-mode controller designed for off–line converters. This high voltage circuit
that integrates the start–up current source and the oscillator capacitor, requires few external components while offering
a high flexibility and reliability.
The device also features a very high efficiency stand–by management consisting of an effective Pulsed Mode operation.
This technique enables the reduction of the stand–by power consumption to approximately 1 W while delivering 300
mW in a 150 W SMPS.
• Integrated start–up current source
• Loss less off–line start–up
• Direct off–line operation
• Fast start–up
General Features
• Flexibility
• Duty cycle control
• On chip oscillator switching frequency 40, or 75 KHz
• Secondary control with few external components
Protections
• Maximum duty cycle limitation
• Cycle by cycle current limitation
• Demagnetization (Zero current detection) protection
• “Over V CC protection” against open loop
• Programmable low inertia over voltage protection against open loop
• Internal thermal protection
GreenLine Controller
• Pulsed mode techniques for a very high efficiency low power mode
• Lossless start-up
• Low dV/dT for low EMI radiation
Pinning, Pin Value
1. Demagnetization Zero cross detection voltage: 50 mV typ.
2. I Sense Over current protection voltage 1 V typ.
3. Control Input Min: 7.5 V Max.: 18 V
4. Ground Iout 2 Ap-p during scan 1.2 Ap-p during flyback
5. Driver Output resistor 8.5 Ohm sink 15 Ohm source typ.
6. Supply voltage Max: 16 V (Operating range 6.6 V - 13 V)
7. No connection
8. Line Voltage Min: 50 V Max: 500 V
MSP34X0G
The MSP 34x0G family of single-chip Multistandard 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. Figure 3 shows a simplified
functional block diagram of the MSP 34x0G. This new generation of TV sound processing ICs now includes versions for
processing the multichannel television sound (MTS) signal conforming to the standard recommended by the Broadcast
Television Systems Committee (BTSC). 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.
Current ICs have to perform adjustment procedures in order to achieve good stereo separation for BTSC and EIA-J.
The MSP 34x0G has optimum stereo performance without any adjustments. All MSP 34xxG versions are pin compatible
to the MSP 34xxD. Only minor modifications are necessary to adapt a MSP 34xxD controlling software to the MSP
34xxG. The MSP 34x0G further simplifies controlling software.
Standard selection requires a single I2C transmission only. The MSP 34x0G has built-in automatic functions: The IC is
able to detect the actual sound standard automatically (Automatic Standard Detection).
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CHASSIS
Furthermore, pilot levels and identification signals can be evaluated internally with subsequent switching between
mono/ stereo/bilingual; no I2C interaction is necessary (Automatic Sound Selection). The MSP 34x0G can handle very
high FM deviations even in conjunction with NICAM processing. This is especially important for the introduction of
NICAM in China. The ICs are produced in submicron CMOS technology.
                    
So
ur
c
e
 Se
le
ct
Loud-
SCART1
SCART2
SCART1
SCART2
SCART4
SCART3
MONO
De-
modulator
Headphone
Headphone
I
2
S
Sound
Processing
speaker
Sound
Processing
DAC
DAC
ADC
Loud-
DAC
DAC
ADC
Subwoofer
SCART
DSP 
Input 
Select
Pre-
processing
SCART 
Output 
Select
Prescale
Prescale
I
2
S1
I
2
S2
Sound IF1
Sound IF2
speaker
Figure 3. Simplified functional block diagram of the MSP 34x0G.
24C08
General description
The 24C08 is a 8  Kbit electrically erasable programmable memory (EEPROM), organized as 4 blocks of 256 * 08 bits.
The memory operates with a power supply value as low as 2.5 V.
Features
Minimum 1 million ERASE / WRITE cycles with over 10 years data retention
Single supply voltage: 4.5 to 5.5 V
Two wire serial interface, fully I²C-bus compatible
Byte and Multi-byte write (up to 8 bytes)
Page write (up to 16 bytes)
Byte, random and sequential read modes
Self timed programming cycle
Pinning, Pin Value
1. Write protect enable: 0 V
2. Not connected: 0 V
3. Chip enable input: 0 V
4. Ground: 0 V
5. Serial data address input/output: Input LOW voltage: Min: -0.3 V, Max: 0.3 * Vcc: Input HIGH voltage: Min:
     0.7* Vcc, Max: Vcc+1
6. Serial clock: Input LOW voltage: Min: -0.3 V, Max: 0.3 * Vcc: Input HIGH voltage: Min: 0.7 * Vcc, Max: Vcc+1
7. Multibyte/Page write mode: Input LOW voltage: Min: -0.3 V, Max: 0.5 V: Input HIGH voltage: Min: Vcc - 0.5,
     Max: Vcc + 1
8. Supply voltage: Min: 2.5 V, Max: 5.5 V
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