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PDF VPH-G90E Data sheet ( Hoja de datos )
| Número de pieza | VPH-G90E | |
| Descripción | MULTISCAN PROJECTOR | |
| Fabricantes | Sony | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de VPH-G90E (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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THEORY OF OPERATION
M……O…DE…L…
VPH-G90U
VPH-G90E
VPH-G90M
…DE…S…T.
…CH…A…SS…IS…N…O….
M……O…DE…L…
US/CND SCC-K81D-A
AEP
SCC-K82E-A
E SCC-N96A-A
…DE…S…T.
…CH…A…SS…IS…N…O….
MULTISCAN PROJECTOR
1 page  
10. DE BOARD
10-1. OUTLINE ..................................................................................................... 10-1
10-2. WAVEFORM GENERATOR ..................................................................... 10-1
10-2-1. MG.HD Circuit ..................................................................................... 10-2
10-2-2. Waveform Generation Circuit .............................................................. 10-2
10-3. D/A CONVERTER OUTPUT CIRCUIT .................................................... 10-2
11. DF BOARD
11-1. OUTLINE ..................................................................................................... 11-1
11-2. GENERATOR OF VERTICAL OUTPUT (VOUT) WAVEFORM ........... 11-1
11-3. VERTICAL DEFLECTION OUTPUT ........................................................ 11-2
11-4. CHANGES IN VERTICAL POLARITY .................................................... 11-2
11-5. VERTICAL DEFLECTION STOP CIRCUIT (V.STOP) ........................... 11-2
11-6. 2-POLE/4-POLE OUTPUT CIRCUIT ........................................................ 11-3
12. E/EA/ED/PD/PE BOARDS
12-1. FV CONVERSION .................................................................................... 12-1
12-2. PIN MOD ................................................................................................... 12-2
12-3. HORIZONTAL DRIVE (H DRIVE) ......................................................... 12-3
12-3-1. Horizontal Drive Variable Power Supply .......................................... 12-3
12-3-2. ON-ON Horizontal Drive Circuit ....................................................... 12-5
12-3-3. IB2 Constant Circuit .......................................................................... 12-5
12-4. HORIZONTAL SIZE FEEDBACK, HORIZONTAL SIZE MAXIMUM/
MINIMUM PROTECTOR, LINE OUTPUT TRANSFORMER, +B LINE
CURRENT PROTECTOR ......................................................................... 12-6
12-6. HORIZONTAL CENTERING CIRCUIT ................................................. 12-8
12-7. HORIZONTAL OUTPUT CIRCUIT ........................................................ 12-9
12-8. HORIZONTAL LINEARITY CORRECTION CIRCUIT ........................ 12-9
12-9. HV IMAGE BENDING CORRECTION CIRCUIT ............................... 12-10
12-10. LENS PROTECTOR (PD BARD)........................................................... 12-10
12-11. LOT (LINE OUTPUT TRANSFORMER) CIRCUIT (PE CIRCUIT).... 12-11
12-11-1. Minus Power Supply (PD Board) .................................................... 12-11
12-11-2. G2 Regulator Circuit (PE Board) ..................................................... 12-12
12-11-3. FAN Circuit (PE Board) ................................................................... 12-12
13. EBQ/EBH BOARD
13-1. OUTLINE ..................................................................................................... 13-1
13-2. GREEN AQP CIRCUIT ............................................................................... 13-1
13-3. EBQ PROTECTION CIRCUIT ................................................................... 13-1
VPH-G90E/G90U/G90M
3
5 Page 
1-4. ABL/IK PROTECTOR
1-5. D/A CONVERTER BLOCK
There are two ABL, Single ABL and Total ABL.
1-4-1. Single ABL
The D/A converter IC609/IC611 (MP7670) output the
contrast and brightness control signals, R/G/B drive bias
signals, and limit control signal.
The R/G/B cathode currents (Ik) are detected by the CD
board. The detected Iks are pass through the buffers
(IC807/IC808/IC809) and amplifiers (IC802 (2/2)/IC805),
then they are input to the comparators (Q808/Q816/Q817).
If the comparator input voltage is greater than the reference
voltage, the comparator transistor turns to ON state, and
the Single ABL works.
1-4-2. Total ABL
The sum of each Ik (R/G/B) detected by the PA board is
input to comparator (Q814). The total ABL works if the
comparator input voltage is greater than the reference
voltage at the base of Q813.
The level of both Single ABL and Total ABL will be
changed in accordance with the screen size to protect the
burning of the CRT. The picture size information is output
from the D/A converter (IC2001 : CXA1875AM), and it is
input to an amplifier IC803 (TL082CPS (1/2). As a result,
base voltages of Q813 and Q817/Q808/Q816 are
controlled to apply optimum ABL correction according to
the picture size.
1-4-3. Ik Protector
There are the two Ik protectors, and one out of two is
processed by the BA board.
The maximum value of each Ik (R/G/B) is detected by
Q809/Q810/Q811/Q812. The detected maximum value is
compared with the reference value by IC804 (1/2)
(uPC393G2). If the detected maximum value is greater
than the reference value, Ik protection line goes “High”
level to apply protection.
1-6. SYNC BLOCK
The H sync, C sync, and V sync signals input to SYNC/
HD and VD connectors on the rear connector panel, are
input to Q1/Q3/IC4 (TL082CPS) and Q4/Q6/IC4
(TL082CPS) where they are averaging. The averaged DC
value and sync waveform are input to differential line
receiver (IC12), they are converted to a TTL signal, then
output to the next stage.
When inputting a special sync signal, such as tele-text or
PAL-DVD, to the SYNC/HD BNC connector on the rear
connector panel, C sync signal is output from IC11
(GS4981-CTA) only when the R/G/B signals are input to
INPUT A. The horizontal frequency (fH) of regular video
signal through high-vision signal (Tri-sync) can be used,
and the optimum sync route is automatically discriminating
(Auto). It is possible to change the sync route forcibly
(Sync with Video).
1-7. MONITOR OUTPUT BLOCK
IC5, IC8, and IC10 (MAX4223ESA) form a buffer
amplifier for the monitor output. By connecting the IFB-
12, the signals input to INPUT A can be monitored from
the IFB-12. (Only when the slide switch inside the IFB-12
is set to “OUT” position, the selection signal is output from
the IFB-12, then the input/output of the signals are
switched by relays RY1/RY2/RY3.)
1-8. ± 12 V, ± 5 V, +9 V
If the voltage of ± 12 V, ± 5 V or +9 V drops for some
reason, the protector works and the power is turned to
OFF. The IC2110 (MAX8213) is a protector, and an
operating point of protection can be manually set.
The output of IC2110 is open drain. During normal
operation, the output of IC2110 is kept in “High” level. If
abnormality is detected, it is turned to “Low” level. The
output of IC2110 is inverted by Q2100, and is supplied to
the Y board. The Y board monitors all protector
operations.
VPH-G90E/G90U/G90M
1-3
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet VPH-G90E.PDF ] | |
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