Sharp 28LW-92H (serv.man2) Service Manual ▷ View online
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CHASSIS
13.12.TCET1102G
13.12.1.Description
The TCET110/ TCET2100/ TCET4100 consists of a phototransistor optically coupled to a gallium
arsenide infrared-emitting diode in a 4-lead up to 16-lead plastic dual inline package. The elements are
mounted on one lead frame using a coplanar technique, providing a fixed distance between input and
output for highest safety requirements.
arsenide infrared-emitting diode in a 4-lead up to 16-lead plastic dual inline package. The elements are
mounted on one lead frame using a coplanar technique, providing a fixed distance between input and
output for highest safety requirements.
13.12.2.Applications
Circuits for safe protective separation against electrical shock according to safety class II (reinforced
isolation):
For appl. class I – IV at mains voltage
isolation):
For appl. class I – IV at mains voltage
300 V
For appl. class I – III at mains voltage
600 V
According to VDE 0884, table 2, suitable for: Switch-mode power supplies, line receiver, computer
peripheral interface, and microprocessor system interface.
peripheral interface, and microprocessor system interface.
13.12.3.Features
VDE 0884 related features:
Rated impulse voltage (transient overvoltage) V
Rated impulse voltage (transient overvoltage) V
IOTM
= 8 kV peak
Isolation test voltage (partial discharge test voltage) V
pd
= 1.6 kV
Rated isolation voltage (RMS includes DC) V
IOWM
= 600 V
RMS
(848 V peak)
Rated recurring peak voltage (repetitive) V
IORM
= 600 V
RMS
General features:
CTR offered in 9 groups
Isolation materials according to UL94-VO
Pollution degree 2 (DIN/VDE 0110 / resp. IEC 664)
Climatic classification 55/100/21 (IEC 68 part 1)
Special construction: Therefore, extra low coupling capacity of typical 0.2pF, high Common Mode
Rejection
Low temperature coefficient of CTR
G = Leadform 10.16 mm; provides creepage distance > 8 mm, for TCET2100/ TCET4100 optional;
suffix letter ‘G’ is not marked on the optocoupler
Coupling System U
13.13.TDA9885T
13.13.1.General Description
The TDA9885 is an alignment-free single standard (without positive modulation) vision and sound IF signal
PLL.
PLL.
13.13.2.Features
5 V supply voltage
Gain controlled wide-band Vision Intermediate Frequency (VIF) amplifier (AC-coupled)
Multistandard true synchronous demodulation with active carrier regeneration (very linear demodulation,
Gain controlled wide-band Vision Intermediate Frequency (VIF) amplifier (AC-coupled)
Multistandard true synchronous demodulation with active carrier regeneration (very linear demodulation,
good intermodulation figures, reduced harmonics, excellent pulse response)
Gated phase detector for L/L accent standard
Fully integrated VIF Voltage Controlled Oscillator (VCO), alignment-free; frequencies switchable for all
negative and positive modulated standards via I
Gated phase detector for L/L accent standard
Fully integrated VIF Voltage Controlled Oscillator (VCO), alignment-free; frequencies switchable for all
negative and positive modulated standards via I
2
C-bus
Digital acquisition help, VIF frequencies of 33.4, 33.9, 38.0, 38.9, 45.75 and 58.75 MHz
4 MHz reference frequency input [signal from Phase-Locked Loop (PLL) tuning system] or operating as
crystal oscillator
VIF Automatic Gain Control (AGC) detector for gain control, operating as peak sync detector for negative
modulated signals and as a peak white detector for positive modulated signals
Precise fully digital Automatic Frequency Control (AFC) detector with 4-bit digital-to-analog converter; AFC
bits via I
4 MHz reference frequency input [signal from Phase-Locked Loop (PLL) tuning system] or operating as
crystal oscillator
VIF Automatic Gain Control (AGC) detector for gain control, operating as peak sync detector for negative
modulated signals and as a peak white detector for positive modulated signals
Precise fully digital Automatic Frequency Control (AFC) detector with 4-bit digital-to-analog converter; AFC
bits via I
2
C -bus readable
TakeOver Point (TOP) adjustable via I
2
C-bus or alternatively with potentiometer
Fully integrated sound carrier trap for 4.5, 5.5, 6.0 and 6.5 MHz, controlled by FM-PLL oscillator
Sound IF (SIF) input for single reference Quasi Split Sound (QSS) mode (PLL controlled)
Sound IF (SIF) input for single reference Quasi Split Sound (QSS) mode (PLL controlled)
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CHASSIS
SIF AGC for gain controlled SIF amplifier; single reference QSS mixer able to operate in high performance
single reference QSS mode and in intercarrier mode, switchable via I
single reference QSS mode and in intercarrier mode, switchable via I
2
C-bus
AM demodulator without extra reference circuit
Alignment-free selective FM-PLL demodulator with high linearity and low noise
I
Alignment-free selective FM-PLL demodulator with high linearity and low noise
I
2
C-bus control for all functions
I
2
C-bus transceiver with pin programmable Module Address (MAD).
13.13.3.Pinning
SYMBOL PIN DESCRIPTION
VIF1 1
VIF differential input 1
VIF2
2
VIF differential input 2
OP1
3
output 1 (open-collector)
FMPLL
4
FM-PLL for loop filter
DEEM
5
de-emphasis output for capacitor
AFD
6
AF decoupling input for capacitor
DGND
7
digital ground
AUD
8
audio output
TOP
9
tuner AGC TakeOver Point (TOP)
SDA
10
I
2
C-bus data input/output
SCL
11
I
2
C-bus clock input
SIOMA
12
sound intercarrier output and MAD select
n.c.
13
not connected
TAGC
14
tuner AGC output
REF
15
4 MHz crystal or reference input
VAGC
16
VIF-AGC for capacitor; note 1
CVBS
17
video output
AGND
18
analog ground
VPLL
19
VIF-PLL for loop filter
V
P
20
supply voltage (+5 V)
AFC
21
AFC output
OP2
22
output 2 (open-collector)
SIF1
23
SIF differential input 1
SIF2
24
SIF differential input 2
13.14.PI5V330
13.14.1.General Description
The PI5V330 is well suited for video applications when switching composite or RGB analog.
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CHASSIS
14.AK45 CHASSIS PRODUCTION SERVICE MODE ADJUSTMENTS
14.1.SERVICE MENU
All system, geometry and white balance alignments are performed in production service mode. Before
starting the production mode alignments, make sure that all manual adjustments are done correctly. To
start production mode alignments enter the MAIN MENU and then press the digits 4, 7, 2 and 5
respectively or press MUTE and INFO buttons at the same time. The following first menu appears on
the screen.
You can select Adjust or Options items by pressing Up/Down buttons. Selected parameter will be
highlighted. In order to enter the selected parameter, press Left or Right button. To exit the service
menu press MENU button. Entire service menu parameters of AK45 CHASSIS are listed below.
14.2.ADJUST MENU
Select the parameter by pressing up/down buttons. Adjust the parameter by pressing Left/Right
buttons. In ADJUST menu, changed values are stored automatically.
White Point Red, White Point Green, White Point Blue:
Not used.
AGC
Apply PAL BG signal, VHF-3 Channel-12 and 60dBµV signal level. Adjust AGC (Automatic Gain
Control) item by pressing Left/Right buttons till the voltage at AGC point (pin1 of the tuner) becomes 3.0
volts.
If PLL negative
Not used.
If PLL positive
Not used.
Y-Delay
Enter a PAL B/G colour and black-white bar test pattern via RF. Adjust Y-Delay for PAL till the colour
transients on the colour bar of the pattern become as sharper and colours between transients do not
mix with each other as possible.
000 255
001 036
002 019
003 020
004 030
005 026
006 003
007 004
008 005
009 005
ADJUST...
ADJUST...
OPTIONS...
AK45JA0XX
AK45JA0XX
SERVICE
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Y-Delay SECAM
Enter a SECAM B/G colour and black-white bar test pattern via RF. Adjust Y-Delay SECAM till the
colour transients on the colour bar of the pattern become as sharper and colours between transients do
not mix with each other as possible.
Y-Delay NTSC
Enter an NTSC colour and black-white bar test pattern via RF. Adjust Y-Delay NTSC till the colour
transients on the colour bar of the pattern become as sharper and colours between transients do not
mix with each other as possible.
Y-Delay other
Not used.
Vertical Position Offset
This value is fixed (127)
Vertical Position Offset
This value is fixed (127)
Horizontal Position Offset
This value is fixed (127)
Horizontal Position Offset
This value is fixed (127)
Vertical Blank Start
This register will be used only at 4:3 tubes for 16:9 mode adjustment. It adjusts the vertical blank start
position.
Vertical Blank Stop
This register will be used only at 4:3 tubes for 16:9 mode adjustment. It adjusts the vertical blank stop
position.
Angle
Change Angle by pressing Left/Right buttons till the vertical lines of the crosshatch pattern become
completely perpendicular to horizontal lines without any angle of vertical deviation. Check and readjust
ANGLE item if the adjustment becomes improper after some other geometric adjustments are done.
Bow
Change Bow by pressing Left/Right buttons till the vertical lines especially ones close to the left and
right sides will of equal and symmetrical bending, i.e. they together will neither be towards left side nor
right side. Check and readjust BOW item if the adjustment becomes improper after some other
geometric adjustments are done.
4:3 Horizontal Blank Start
This register will be used only at 16:9 tube for 4:3 mode adjustment. It adjusts the horizontal blank start
position.
4:3 Horizontal Blank Stop
This register will be used only at 16:9 tube for 4:3 mode adjustment. It adjusts the horizontal blank stop
position.
EHTV Compensation
It’s used to adjust the EHT compensation vertical gain coefficient.
EHTTM Compensation
It’s used to adjust the EHT compensation time constant.
EHTEW Compensation
It’s used to adjust the EHT compensation east/west gain coefficient.
Enter a SECAM B/G colour and black-white bar test pattern via RF. Adjust Y-Delay SECAM till the
colour transients on the colour bar of the pattern become as sharper and colours between transients do
not mix with each other as possible.
Y-Delay NTSC
Enter an NTSC colour and black-white bar test pattern via RF. Adjust Y-Delay NTSC till the colour
transients on the colour bar of the pattern become as sharper and colours between transients do not
mix with each other as possible.
Y-Delay other
Not used.
Vertical Position Offset
This value is fixed (127)
Vertical Position Offset
This value is fixed (127)
Horizontal Position Offset
This value is fixed (127)
Horizontal Position Offset
This value is fixed (127)
Vertical Blank Start
This register will be used only at 4:3 tubes for 16:9 mode adjustment. It adjusts the vertical blank start
position.
Vertical Blank Stop
This register will be used only at 4:3 tubes for 16:9 mode adjustment. It adjusts the vertical blank stop
position.
Angle
Change Angle by pressing Left/Right buttons till the vertical lines of the crosshatch pattern become
completely perpendicular to horizontal lines without any angle of vertical deviation. Check and readjust
ANGLE item if the adjustment becomes improper after some other geometric adjustments are done.
Bow
Change Bow by pressing Left/Right buttons till the vertical lines especially ones close to the left and
right sides will of equal and symmetrical bending, i.e. they together will neither be towards left side nor
right side. Check and readjust BOW item if the adjustment becomes improper after some other
geometric adjustments are done.
4:3 Horizontal Blank Start
This register will be used only at 16:9 tube for 4:3 mode adjustment. It adjusts the horizontal blank start
position.
4:3 Horizontal Blank Stop
This register will be used only at 16:9 tube for 4:3 mode adjustment. It adjusts the horizontal blank stop
position.
EHTV Compensation
It’s used to adjust the EHT compensation vertical gain coefficient.
EHTTM Compensation
It’s used to adjust the EHT compensation time constant.
EHTEW Compensation
It’s used to adjust the EHT compensation east/west gain coefficient.
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