Sharp 21HT-15 (serv.man8) Service Manual ▷ View online
21
21HT-15H
ICs ADITIONAL INFORMATION:TDA9350(IC801)
Note
1. The function of pin 20, 28, 29, 31, 32, 35 and 44 is dependent on the IC version (mono intercarrier FM demodulator
/ QSS IF amplifier and East-West output or not) and on some software control bits. The valid combinations are given
in table 1.
in table 1.
2. The vertical guard function can be controlled via pin 49 or pin 50. The selection is made by means of the IVG bit in
subaddress 2BH.
Table 1
Pin functions for various versions
Note
1. When additional (external) selectivity is required for FM-PLL system pin 32 can be used as sound IF input. This
function is selected by means of SIF bit in subaddress 28H.
2. The reference output signal is only available for the CMB1/CMB0 setting of 0/1. For the other settings this pin is a
switch output (see also table 67).
INSSW2
45
2
nd
RGB / YUV insertion input
R2/VIN
46
2
nd
R input / V (R-Y) input
G2/YIN
47
2
nd
G input / Y input
B2/UIN
48
2
nd
B input / U (B-Y) input
BCLIN
49
beam current limiter input / (V-guard input, note 2)
BLKIN
50
black current input / (V-guard input, note 2)
RO
51
Red output
GO
52
Green output
BO
53
Blue output
VDDA
54
analog supply of Teletext decoder and digital supply of TV-processor (3.3 V)
VPE
55
OTP Programming Voltage
VDDC
56
digital supply to core (3.3 V)
OSCGND
57
oscillator ground supply
XTALIN
58
crystal oscillator input
XTALOUT
59
crystal oscillator output
RESET
60
reset
VDDP
61
digital supply to periphery (+3.3 V)
P1.0/INT1
62
port 1.0 or external interrupt 1 input
P1.1/T0
63
port 1.1 or Counter/Timer 0 input
P1.2/INT0
64
port 1.2 or external interrupt 0 input
IC version
FM-PLL version
QSS version
East-West Y/N
N
Y
N
Y
CMB1/CMB0 bits
00
01/10/11
00
01/10/11
00
01/10/11
00
01/10/11
AM bit
−
−
−
−
−
0
1
−
0
1
Pin 20
AVL
EWD
AVL
EWD
Pin 28
AUDEEM
SIFIN1
Pin 29
DECSDEM
SIFIN2
Pin 31
SNDPLL
SIFAGC
Pin 32
SNDIF
(1)
REFO
(2)
AVL/SNDIF
(1)
REFO
(2)
AMOUT
REFO
(2)
AMOUT
REFO
(2)
Pin 35
AUDEXT
AUDEXT QSSO AMOUT AUDEXT QSSO AMOUT
Pin 44
AUDOUT
controlled AM or audio out
SYMBOL
PIN
DESCRIPTION
22
21HT-15H
ICs ADITIONAL INFORMATION:TEA1507(IC701)
ndbook, full pagewidth
SUPPLY
MANAGEMENT
internal
supply
UVLO
start
M-level
VCC
1
2
3
GND
S1
CTRL
FREQUENCY
CONTROL
VOLTAGE
CONTROLLED
OSCILLATOR
LOGIC
LOGIC
OVER-
VOLTAGE
PROTECTION
OVERPOWER
PROTECTION
PROTECTION
short
winding
soft
start
S2
OVER-
TEMPERATURE
PROTECTION
S
Q
R
UVLO
Q
MAXIMUM
ON-TIME
PROTECTION
POWER-ON
RESET
−
1
VALLEY
TEA1507
100 mV
clamp
DRIVER
START-UP
CURRENT SOURCE
0.75 V
0.5 V
5
Isense
6
DRIVER
MGU230
4
DEM
8
DRAIN
7
HVS
n.c.
n.c.
OCP
LEB
blank
Iss
2.5 V
burst
detect
detect
Block diagram.
PINNING
SYMBOL PIN
DESCRIPTION
V
CC
1
supply voltage
GND
2
ground
CTRL
3
control input
DEM
4
input from auxiliary winding for
demagnetization timing, OVP and OPP
demagnetization timing, OVP and OPP
I
sense
5
programmable current sense input
DRIVER
6
gate driver output
HVS
7
high voltage safety spacer, not
connected
connected
DRAIN
8
drain of external MOS switch, input for
start-up current and valley sensing
start-up current and valley sensing
handbook, halfpage
MGU231
TEA1507
1
2
3
4
VCC
GND
CTRL
DEM
DRAIN
HVS
DRIVER
Isense
8
7
6
5
Pin configuration.
23
21HT-15H
ICs ADITIONAL INFORMATION:AN7523(IC303)
ICs ADITIONAL INFORMATION:AN5522(IC501)
1
2
3
4
5
6
7
8
9
V
CC
Output
GND
Output
Standby
Input
GND
N.C.
V
olume
Pin No.
Description
1
Vcc
2
Ch Output (+)
3 GND
4
Ch Output (-)
5
Standby
6
Ch Input
7
GND (Input)
8
N.C
9
Volume
Circuit Function Block Diagram
Pin Descriptions
Note: Do not apply voltage or current to NC pin from outside
Pin No.
Pin Name
1
Inverting Input
2
Power Supply
3
Pump-up Output
4
GND
5
Vertical Output
6
Vertical Output Power Supply
7
Non-inverting Input
Pin Descriptions
Non-inverting Input
Output Vcc
Output
GND
Pump Up Out
Vcc
Inverting Input
1
2
3
4
5
6
7
Pump Up
Thermal Protection
Amp
+
-
Circuit Function Block Diagram
24
21HT-15H
WAVEFORM MEASUREMENT CONDITION:
Colour bar genetator signal of 70 dB from RF input.
Colour bar genetator signal of 70 dB from RF input.
DESCRIPTION OF SCHEMATIC DIAGRAM
1. The unit of resistance «ohm»is omitted (K=1000
ohms. M= Megaohm).
2. All resistors are 1/16 watt. unless otherwise noted.
3. All capacitors are
ohms. M= Megaohm).
2. All resistors are 1/16 watt. unless otherwise noted.
3. All capacitors are
µ
F, unless otherwise noted (P=
µµ
F).
4. The capacitor with Part No. RC-FZ9XXXBMNJ is
designed to with stand 63V.
5. The capacitor with Part No. RC-FZ4XXXBMNJ is
designed to with stand 50V.
designed to with stand 63V.
5. The capacitor with Part No. RC-FZ4XXXBMNJ is
designed to with stand 50V.
NOTE:
SERVICE PRECAUTION:
THE AREA ENCLOSED BY THIS LINE ( )
IS DIRECTLY CONNECTED WITH AC MAINS
VOLTAGE.
WHEN SERVICING THE AREA, CONNECT AN
ISOLATING TRANSFORMER BETWEEN TV
RECEIVER AND AC LINE TO ELIMINATE
HAZARD OF ELECTRIC SHOCK.
IS DIRECTLY CONNECTED WITH AC MAINS
VOLTAGE.
WHEN SERVICING THE AREA, CONNECT AN
ISOLATING TRANSFORMER BETWEEN TV
RECEIVER AND AC LINE TO ELIMINATE
HAZARD OF ELECTRIC SHOCK.
CAUTION
This circuit diagram is original one,
therefore there may be slight difference
from yours.
This circuit diagram is original one,
therefore there may be slight difference
from yours.
IMPOTANT SAFETY NOTE:
PARTS MARKED WITH «
» (
) ARE
IMPORTANT FOR MAINTAINING THE SAFETY
OF THE SET. BE SURE TO REPLACE THESE
PARTS WITH SPECIFIED ONES FOR MAINTAIN-
ING THE SAFETY AND PERFORMANCE OF THE
SET.
OF THE SET. BE SURE TO REPLACE THESE
PARTS WITH SPECIFIED ONES FOR MAINTAIN-
ING THE SAFETY AND PERFORMANCE OF THE
SET.
!
SAFETY NOTE:
1. DISCONNECT THE AC PLUG FROM THE AC
OUTLET BEFORE REPLACING PARTS.
1. DISCONNECT THE AC PLUG FROM THE AC
OUTLET BEFORE REPLACING PARTS.
2. SEMICONDUCTOR HEAT SINKS SHOULD BE
REGARDED AS POTENTIAL SHOCK HAZARDS
WHEN THE CHASSIS IS OPERATING.
REGARDED AS POTENTIAL SHOCK HAZARDS
WHEN THE CHASSIS IS OPERATING.
WAVEFORMS:
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