Sharp 21LF-90H (serv.man3) Service Manual ▷ View online
13
AK - 44
CHASSIS
9.1 B.C.L Circuit (Beam Current Limiter)
Beam current limiting is employed to protect the circuitry in the receiver, the CRT and to prevent excessive X Ray
radiation in fault conditions. The current drawn by the CRT is monitored by the current drawn through the winding of the
fly-back transformer that produces the EHT for the CRT anode. The end of the winding (Pin 10) is returned to IC403
Pins 46, the beam current drawn by the CRT passes through Q603 and develops a voltage on the collector proportional
to the current (V=IxR).
The voltage on the collector will vary depending on the beam current being drawn reducing the brightness and contrast
of the picture. If the voltage is sufficiently negative (indicating very high excess beam current) the output will be re-
duced, reducing the picture brightness and contrast.
radiation in fault conditions. The current drawn by the CRT is monitored by the current drawn through the winding of the
fly-back transformer that produces the EHT for the CRT anode. The end of the winding (Pin 10) is returned to IC403
Pins 46, the beam current drawn by the CRT passes through Q603 and develops a voltage on the collector proportional
to the current (V=IxR).
The voltage on the collector will vary depending on the beam current being drawn reducing the brightness and contrast
of the picture. If the voltage is sufficiently negative (indicating very high excess beam current) the output will be re-
duced, reducing the picture brightness and contrast.
10. SERIAL ACCESS CMOS 8K EEPROM 24C08
The 24C08 is a 8 Kbit electrically erasable programmable memory (EEPROM), organized as 4 blocks of 256*08 bits.
The memory is compatible with the I²C standard, two wire serial interface which uses a bi-directional data bus and serial
clock.
The memory is compatible with the I²C standard, two wire serial interface which uses a bi-directional data bus and serial
clock.
EEPROM Initialisation
If the E²PROM IC500 is replaced it will come fully programmed and therefore it is not necessary to initialise the new
device. In some circumstances the E²PROM may become corrupted in use i.e. static discharge or lightning strike. If this
happens, it is advised that the E²PROM is replaced.
device. In some circumstances the E²PROM may become corrupted in use i.e. static discharge or lightning strike. If this
happens, it is advised that the E²PROM is replaced.
11. SAW FILTERS
Saw filter type: Model:
G1975M: PAL B/G MONO
K2966M: PAL SECAM B/G/D/K/I MONO
J1981 : PAL-I MONO
K2958M: PAL-SECAM B/G-D/K (38) MONO
2962M: PAL-SECAM B/G/D/K/I/L/L’ MONO
L9653M: SECAM L/L’ AM MONO (AUDIO IF)
G3967M: PAL-SECAM B/G STEREO (VIDEO IF)
G9353M: PAL-SECAM B/G STEREO (AUDIO IF)
K3958M: PAL-SECAM B/G/D/K/I/L/L’ STEREO (VIDEO IF)
K9356M: PAL-SECAM B/G/D/K/I STEREO (AUDIO IF)
K9656M: PAL-SECAM B/G/D/K/I/L/L’ STEREO (AUDIO IF)
K3958M: PAL I NICAM (VIDEO IF)
K9356M: PAL I NICAM (AUDIO IF)
G1975M: PAL B/G MONO
K2966M: PAL SECAM B/G/D/K/I MONO
J1981 : PAL-I MONO
K2958M: PAL-SECAM B/G-D/K (38) MONO
2962M: PAL-SECAM B/G/D/K/I/L/L’ MONO
L9653M: SECAM L/L’ AM MONO (AUDIO IF)
G3967M: PAL-SECAM B/G STEREO (VIDEO IF)
G9353M: PAL-SECAM B/G STEREO (AUDIO IF)
K3958M: PAL-SECAM B/G/D/K/I/L/L’ STEREO (VIDEO IF)
K9356M: PAL-SECAM B/G/D/K/I STEREO (AUDIO IF)
K9656M: PAL-SECAM B/G/D/K/I/L/L’ STEREO (AUDIO IF)
K3958M: PAL I NICAM (VIDEO IF)
K9356M: PAL I NICAM (AUDIO IF)
12. IC DESCRIPTIONS AND INTERNAL BLOCK DIAGRAM
ST92195
STV224X
TUNER (UV1315, UV1316, UV1336)
TDA7266L / TDA7266M
TDA8174A
TDA6107
MC44608
MSP34X0G
24C08
TDA1308
SAW FILTERS
G1975M, K2966M, K2962M, L9653M, G3962M, G9353M, K3958M, K9356M, K9656M, K6263K, K9652M
STV224X
TUNER (UV1315, UV1316, UV1336)
TDA7266L / TDA7266M
TDA8174A
TDA6107
MC44608
MSP34X0G
24C08
TDA1308
SAW FILTERS
G1975M, K2966M, K2962M, L9653M, G3962M, G9353M, K3958M, K9356M, K9656M, K6263K, K9652M
14
AK - 44
CHASSIS
ST92195
The ST92195 is a member of the ST9+ family of micro-controllers, completely developed and produced by
STMicroelectronics using a proprietary n-well HCMOS process. The nucleus of the ST92195 is the advanced Core,
which includes the Central Processing Unit (CPU), the ALU, the Register File and the interrupt controller. The Core has
independent memory and register buses to add to the efficiency of the code. A set
of on-chip peripherals form a complete system for TV set and VCR applications:
STMicroelectronics using a proprietary n-well HCMOS process. The nucleus of the ST92195 is the advanced Core,
which includes the Central Processing Unit (CPU), the ALU, the Register File and the interrupt controller. The Core has
independent memory and register buses to add to the efficiency of the code. A set
of on-chip peripherals form a complete system for TV set and VCR applications:
– Voltage Synthesis
– VPS/WSS Slicer
– Teletext Slicer
– Teletext Display RAM
– OSD
– VPS/WSS Slicer
– Teletext Slicer
– Teletext Display RAM
– OSD
Additional peripherals include a watchdog timer , a serial peripheral interface (SPI), a 16-bit timer and an A/D converter.
g
g
INT7/P2.0
RESET
P0.7
P0.6
P0.5
P0.4
P0.3
P0.6
P0.5
P0.4
P0.3
AIN4/P0.2
P0.1
P0.0
P0.0
CSO/RESET0/P3.7
P3.6
P3.5
P3.4
P3.5
P3.4
B
G
R
FB
SDA1/SDI/SDO/P5.1
SCL1/SCK/INT2/P5.0
V
DD
JTDO
WSCF
V
PP
/WSCR
AVDD3
AVDD3
TEST0
MCFM
JTCK
P2.1/INT5/AIN1
P2.2/INT0/AIN2
P2.3/INT6/VS01
P2.4/NMI
P2.5/AIN3/INT4/VS02
OSCIN
OSCOUT
P4.7/PWM7/EXTRG/STOUT0
P4.6/PWM6
P4.5/PWM5/SDA2
P4.4/PWM4/SCL2
P4.3/PWM3/TSLU/HT
P4.2/PWM2
P4.1/PWM1
P4.0/PWM0
VSYNC
HSYNC/CSYNC
AVDD1
PXFM
JTRSTO
GND
AGND
CVBS1
CVBS2
JTMS
AVDD2
CVBSO
P2.2/INT0/AIN2
P2.3/INT6/VS01
P2.4/NMI
P2.5/AIN3/INT4/VS02
OSCIN
OSCOUT
P4.7/PWM7/EXTRG/STOUT0
P4.6/PWM6
P4.5/PWM5/SDA2
P4.4/PWM4/SCL2
P4.3/PWM3/TSLU/HT
P4.2/PWM2
P4.1/PWM1
P4.0/PWM0
VSYNC
HSYNC/CSYNC
AVDD1
PXFM
JTRSTO
GND
AGND
CVBS1
CVBS2
JTMS
AVDD2
CVBSO
TXCF
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
Figure 1. Microcontroller Pin Description
15
AK - 44
CHASSIS
STV224X Video processor
The STV2246/2247/2248 are fully bus controlled ICs for TV including PIF, SIF, luma, Chroma and deflection processing.
Used with a vertical frame booster (TDA1771 or TDA8174 for 90° chassis, STV9306 for 110° chassis), they allow the
design of multi-standard sets with very few external components and no manual adjustments.
Used with a vertical frame booster (TDA1771 or TDA8174 for 90° chassis, STV9306 for 110° chassis), they allow the
design of multi-standard sets with very few external components and no manual adjustments.
SIFIN1
SIFIN2
AGCSIFCAP
V
REFIF
AGCPIFCAP
PIFIN1
PIFIN2
TUNERAGCOUT
IFPLL
GND
IF
AM/FMOUT/SC
V
CCIF
INTCVBSOUT
EXTAUDIOIN
PIFLC1
PIFLC2
V
CC2
CVBSIN1
GND2
CVBSIN2
BS
Y/CVBSIN3
CHR
APR
BEXT/Cb
GEXT/Y
REXT/Cr
FBEXT
FMCAP
AUDIOOUT
GNDD
V
CCD
SDA
SCL
SLPF
LFB/SSC
HOUT
VERT
BCL/SAF
V
CC1
CVBSOUT2
GND1
X1/VAMP/CHROUT
CLPF
XTAL1
XTAL2
XTAL3/BTUN
ROSD
GOSD
BOSD
I
CATH
ROUT
GOUT
BOUT
NTBC/CVBSOUT1
FBOSD/HC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
Figure 2. Pin connections STV224X/8X (SDIP56)
UV1315, UV1316, UV1336
General description of UV1315
The UV1315 tuner belongs to the UV 1300 family of tuners, which are designed to meet a wide range of applications.
It is a combined VHF, UHF tuner suitable for CCIR systems B/G, H, L, L’, I and I’.
The UV1315 tuner belongs to the UV 1300 family of tuners, which are designed to meet a wide range of applications.
It is a combined VHF, UHF tuner suitable for CCIR systems B/G, H, L, L’, I and I’.
Features of UV1315
Member of the UV1300 family small sized UHF/VHF tuners
Systems CCIR: B/G, H, L, L’, I and I’; OIRT: D/K
Voltage synthesized tuning (VST)
Off-air channels, S-cable channels and Hyper-band
Standardized mechanical dimensions and pinning
Systems CCIR: B/G, H, L, L’, I and I’; OIRT: D/K
Voltage synthesized tuning (VST)
Off-air channels, S-cable channels and Hyper-band
Standardized mechanical dimensions and pinning
Pinning, Pin Value
1. Gain control voltage (AGC): 4.0 V, Max: 4.5 V
2. Tuning voltage
3. High band switch: 5 V, Min: 4.75 V, Max: 5.5 V
4. Mid band switch: 5 V, Min: 4.75 V, Max: 5.5 V
5. Low band switch: 5 V, Min: 4.75 V, Max: 5.5 V
6. Supply voltage: 5 V, Min: 4.75 V, Max: 5.5 V
7. Not connected
2. Tuning voltage
3. High band switch: 5 V, Min: 4.75 V, Max: 5.5 V
4. Mid band switch: 5 V, Min: 4.75 V, Max: 5.5 V
5. Low band switch: 5 V, Min: 4.75 V, Max: 5.5 V
6. Supply voltage: 5 V, Min: 4.75 V, Max: 5.5 V
7. Not connected
16
AK - 44
CHASSIS
8. Not connected
9. Not connected
10. Symmetrical IF output 1
11. Symmetrical IF output 2
9. Not connected
10. Symmetrical IF output 1
11. Symmetrical IF output 2
Band switching table:
Pin 3
Pin 4
Pin 5
Low band
0 V
0 V
+ 5 V
Mid band
0 V
+ 5 V
0 V
High band + 5 V
0 V
0 V
General description of UV1316
The UV1316 tuner belongs to the UV 1300 family of tuners, which are designed to meet a wide range of applications.
It is a combined VHF, UHF tuner suitable for CCIR systems B/G, H, L, L’, I and I’.
The UV1316 tuner belongs to the UV 1300 family of tuners, which are designed to meet a wide range of applications.
It is a combined VHF, UHF tuner suitable for CCIR systems B/G, H, L, L’, I and I’.
Features of UV1316
Member of the UV1300 family small sized UHF/VHF tuners
Systems CCIR: B/G, H, L, L’, I and I’; OIRT: D/K
Digitally controlled (PLL) tuning via I²C-bus
Off-air channels, S-cable channels and Hyper-band
World standardized mechanical dimensions and world standard pinning
Complies to “CENELEC EN55020” and “EN55013”
Systems CCIR: B/G, H, L, L’, I and I’; OIRT: D/K
Digitally controlled (PLL) tuning via I²C-bus
Off-air channels, S-cable channels and Hyper-band
World standardized mechanical dimensions and world standard pinning
Complies to “CENELEC EN55020” and “EN55013”
Pinning, Pin Value
1. Gain control voltage (AGC): 4.0 V, Max: 4.5 V
2. Tuning voltage
3. I²C-bus address select: Max: 5.5 V
4. I²C-bus serial clock :Min: -0.3 V, Max: 5.5 V
5. I²C-bus serial data :Min: -0.3 V, Max: 5.5 V
6. Not connected
7. PLL supply voltage: 5.0 V, Min: 4.75 V, Max: 5.5 V
8. ADC input
9. Tuner supply voltage: 33 V, Min: 30 V, Max: 35 V
10. Symmetrical IF output 1
11. Symmetrical IF output 2
2. Tuning voltage
3. I²C-bus address select: Max: 5.5 V
4. I²C-bus serial clock :Min: -0.3 V, Max: 5.5 V
5. I²C-bus serial data :Min: -0.3 V, Max: 5.5 V
6. Not connected
7. PLL supply voltage: 5.0 V, Min: 4.75 V, Max: 5.5 V
8. ADC input
9. Tuner supply voltage: 33 V, Min: 30 V, Max: 35 V
10. Symmetrical IF output 1
11. Symmetrical IF output 2
General description of UV1336
UV1336 series is developed for reception of channels broadcast in accordance with the M, N standard.
UV1336 series is developed for reception of channels broadcast in accordance with the M, N standard.
Features of UV1336
Global standard pinning
Integrated Mixer-Oscillator & PLL function
Conforms to CISPR 13, FCC and DOC (Canada) regulations
Low power consumption
Both Phono connector and ‘F’ connector are available
Integrated Mixer-Oscillator & PLL function
Conforms to CISPR 13, FCC and DOC (Canada) regulations
Low power consumption
Both Phono connector and ‘F’ connector are available
Pinning, Pin Value
1. Gain control voltage: 4.0 V, Max: 4.5 V
2. Tuning voltage
3. Address select Max: 5.5 V
4. Serial clock: Min: -0.3 V, Max: 5.5 V
5. Serial data :Min: -0.3 V, Max: 5.5 V
6. Not connected
7. Supply voltage: 5.0 V, Min: 4.75 V, Max: 5.5 V
8. ADC input (optional)
9. Tuning supply voltage: 33 V, Min: 30 V, Max: 35 V
10. Ground
11. IF output
2. Tuning voltage
3. Address select Max: 5.5 V
4. Serial clock: Min: -0.3 V, Max: 5.5 V
5. Serial data :Min: -0.3 V, Max: 5.5 V
6. Not connected
7. Supply voltage: 5.0 V, Min: 4.75 V, Max: 5.5 V
8. ADC input (optional)
9. Tuning supply voltage: 33 V, Min: 30 V, Max: 35 V
10. Ground
11. IF output
Click on the first or last page to see other 21LF-90H (serv.man3) service manuals if exist.