Table of Contents
Advertisement
Circuit Descriptions, List of Abbreviations, and IC Data Sheets
9. Circuit Descriptions, List of Abbreviations, and IC Data Sheets
Index of this chapter:
1. Introduction
2. Power Supply Unit (PSU)
3. Audio Video Interface panel (AVI)
4. Small Signal Panel (SSP)
5. Front panel (FP)
6. Auto TV
7. Abbreviations
8. IC Data sheets
Note:
•
Figures can deviate slightly from the actual product, due to
different set designs.
•
For a good understanding of the following circuit
descriptions, please use the diagrams in chapter 6 and 7.
Where necessary, you will find a separate drawing for
clarification.
9.1
Introduction
This Receiver box (or E-box) is developed for the global
market. The service chassis name is F21Rx (x stands for the
region; e.g. E=Europe, U= USA). It is an economic version of
the F22Rx chassis, with the following features:
•
Feature Box 7 for better EMC behaviour and improved
"Natural Motion", however without "Eagle" (Pixel Plus).
•
Without "Double Window" panel.
•
Improved Tuner/Splitter (less noise).
•
Without "Down Scaler" panel.
It can drive both FTV1.9 and FM2x plasma screens.
150 - 250V
7001
MC44603A
CONTROL
OUTPUT
CURRENT SENSE
Vdem IN
OVERVOLTAGE PROTECTION
VOLTAGE FEEDBACK
POWER SUPPLY
PS
0300
5000
1001
1
T2,5A
2
MAIN SUPPLY
6000
3
GBU4J
1
4
6000
2
1
VCC
STP6NC60
3042
3
G
F013
7
3016
6007
3030
8
3041
6009
6
14
3037
HOT GROUND
Figure 9-1 Block Diagram Power Supply
9.2
Power Supply Unit (PSU, diagram PS)
9.2.1
PSU: Introduction
A 35W Power Supply is used in the Receiver box. It supports a
range of input voltages (= global), and can be used for almost
every E-box version. It delivers the voltages for the SSP, the
DW, the FBX (+5VSTB, 5V2, 8V6, 7V7, -7V7 and 33V), and for
the specific PWBs. The output of the power supply is
connected to the AVI panel. This panel powers all the other
PWBs.
The Mains voltage is applied to the input filter that feeds it to the
standby supply. This supply is always operational and delivers
the +5VSTBY voltage.
The task of the main supply is to deliver the supply voltages for
the several electrical circuits in the Receiver box. It is switched
via a single-pole relay, which is powered from the +5VSTBY
voltage and controlled via the POWER_ON and STANDBY
signals.
The reason to choose for a separate standby supply, instead of
a single flyback supply (which can be driven in standby mode
like a MC44604), is the requirement to have very low standby
power consumption.
The "POWER ON/STBY" knob is located on the Front I/O panel
and activates the relay supply (POWER_ON). The
microprocessor is then able to switch the set from "standby" to
"on" (STANDBY).
The green "POWER ON" LED is active, when the 8.6 V is
present (HW controlled).
The red "STANDBY" LED is active in standby. The OTC
controls this via ON_OFF_LED.
STANDBY SUPPLY
6203
F072
3200
6204
F073
7200
TNY256
5202
5
DRAIN
CONTROL
2.3
SOURCE
ENABLE
4
6010
2
1
2
3
5003
F008
3
16
N.C.
F011
6101
6110
4
15
6103
14
D
13
S
6106
12
11
3012
3013
3014
6
10
3015
8
9
3109
1
5
7002
TCET1103
4
1
2
HOT
COLD
F21RE AB
6310
5200
F067
SB340
2
7
5300
1
8
4
3310
3
7202
1
5
TL431
7203
1
8
TCET1102
REF.
4
2
2
7401, 7402
STANDBY
ACTIVATING
CIRCUIT
3101
3102
+33V
5102
1101
+8V6
T4A
+7V7
6104
6105
5103
1102
+5V2
T4A
6107
5104
-7V7
6108
3107
7101
POWER
VALID
CIRCUIT
+8V6
+8V6
+5V2
F056
7011
3111
3110
TL431
8
F026
REF.
3113
2
3114
CL 16532098_003.EPS
9.
EN 87
+5VSTBY
0307
1
2
F032
3
4
+5V2
5
F038
6
7
8
+8V6
9
3312
10
F042
11
F069
+33V
3313
F044
3314
0306
1
POWER-ON
2
3
POWER-VALID
4
F052
N.C.
5
+7V7
F054
6
-7V7
7
STANDBY
8
9
F058
N.C.
150801
Advertisement
Table of Contents
