Philips Colour Television Service Manual page 97

Circuit Descriptions, List of Abbreviations, and IC Data Sheets
SENSOR
SSM
BOARD
1201
1014 1020
2 2 79
KEYBOARD
77
5 5
STBY
LED
ON/OFF
4 4
+9V
LED
37
LIGHT 6 6
SENSOR
7 7
78
RC5
VSYNC
CVBS-TXT
The microprocessor, 7100, located on the ACS module,
controls the Convergence, Geometry, and CRT drive circuits.
Settings for Convergence, Geometry, and White drive are
stored in the NVM, 7000. This IC is 512K for the AP sets and
256K for the Korean version. When 7100 reads the size of
7000, it then determines which software to load. If it reads 512K
present, the AP software is loaded. If it reads 256K, NTSC only
software is loaded. Commands for the ACS processor are
produced by the OTC on the SSB and transmitted via the TXD
and RXD lines.
9.5.2 Front Control Panel
1201
2
KEYBOARD
3
GND
5
ON_OFF_LED
3121
560
4
+9V
+9V
3107
330
1
+5V_STANDBY
7
RC5
3109
470
6
LIGHT_SENSOR LIGHT_SENSOR
Figure 9-42 Front Control Panel
The Front Control panel has the Power LED, Keyboard, IR
Receiver, and Light Sensor. The Keyboard is a resistor ladder.
The voltage changes value depending on which selection is
made. The voltage on this line will be 3.3 volts if no buttons are
selected. The two-colour LED indicates the status of the set. In
the Standby mode, the ON_OFF_LED line is High and the +9-
volt source is turned "off". In this case, the RED LED is lit.
When the set is turned "on", the +9-volt source is switched "on",
turning the Green section of the LED "on". The LED then turns
Yellow. When the set is fully "on", the ON_OFF_LED line goes
Low, turning the Red LED "off". The indicator is now Green.
SSB
107
23-37
DTA
7010
113
7001
OTC
7006
104
PROGRAM
FLASH
STANDBY RAM
116
45-66
100
ADD
7015
83
HFB
90
7016
84
89
86
SDA-S
5 85
SCL-S
88
SDA-F
74 87
SCL-F
RESET
91 5
SDA
92 6
SCL
Figure 9-41 Microprocessor
6102
6.8V
6103
6.8V
RED
6101
GREEN
1
6105
2
IR
REC
3
3108
6.8K
RC5
3114
10K
E_15000_111.eps
SSM
7007
7012
EPG DRAM
FLASH-RAM TXT
1043-9
1401-2
1000-1
TxD
RxD
1401-4
1000-2
1043-7
7011
NVM
The IR Receiver, 6105, receives commands from the remote
control.
9.5.3 Light Sensor
+9V
2101
10uF
2102
220n
6104
The Light Sensor, 6104, is amplified by two op amps in 7000.
This circuit senses the ambient light and outputs a voltage on
pin 7 of 7000. This voltage is fed to the OTC, which makes
changes in the picture brightness to compensate for changes
181004
in the ambient light.
DPTV585 AA
+3.3V
ACS
75
7100
82
ACS
CONTROL
81
28
13
84
TO HOP
SDA-C
83 VIA
SCL-C
SSM
16
69
17
1200
70
55
SYNC-V
52
BLANK-UP
48
53
SYNC-H
RED-UP
47
GRN-UP
46
BLUE-UP
72
RESET
30
3111
4.7K
2104
2.2uF
7000-1
3110 3112
3 8
330K 3.3K
+
1
5
2
-
4
6
3115
3116
330K
3.3K
3117
7000-2
1K
Figure 9-43 Light Sensor
9. EN 97
SDA-B
CONV
PROC
SCL-B
6
5
7
WC
7000
NVM
8
+5V
1
E_15000_110.eps
181004
3113
8
+
4.7K
7
LIGHT_SENSOR
-
4
3118
1K
E_15000_112.eps
181004