Read Sharp 76DW-18H (serv.man3) Service Manual online
Wide Screen, Colour Television CW100 Chassis
Sharp Electronics (UK) Ltd
Technical Support
February 99
Page 8
SLAVE PROCESSOR
As described previously, to control the operation of the set in the standby mode (including timer on
function) a Slave Processor (IC6702) is utilised.
function) a Slave Processor (IC6702) is utilised.
This Slave Processor has a volatile memory therefore a copy of its operating system (software) is
stored in the EPROM and any customer/engineering settings are stored in the NVM's (EEPROM)
which forms part of the Main Microprocessor circuit. For this reason, the default condition Slave
Processor standby function (<> standby), pin15; is low; enabling IC6702 software to be downloaded
from the Main Microprocessor circuit each time power is applied to the CTV.
stored in the EPROM and any customer/engineering settings are stored in the NVM's (EEPROM)
which forms part of the Main Microprocessor circuit. For this reason, the default condition Slave
Processor standby function (<> standby), pin15; is low; enabling IC6702 software to be downloaded
from the Main Microprocessor circuit each time power is applied to the CTV.
Figure 1 - Slave Processor Circuit (CA10)
S
TANDBY OPERATION
Due to legislation, which limits the standby power consumption, We ensure that this CTV will
consume as little power as possible during standby. This includes not fitting a standby indicator.
However, legislation states that there must be an indication that power is flowing through the On/off
switch, therefore, fitted across the On/off switch is a 'neon'. The amount of power which a neon
consumes is negligible when compared with an LED or incandescent lamp.
consume as little power as possible during standby. This includes not fitting a standby indicator.
However, legislation states that there must be an indication that power is flowing through the On/off
switch, therefore, fitted across the On/off switch is a 'neon'. The amount of power which a neon
consumes is negligible when compared with an LED or incandescent lamp.
If the CTV is in standby mode when power removed, it will remember to switch to standby the next
time power is applied.
time power is applied.
The data that determine whether the CTV comes on in standby is stored in one of the NVM’s ( IC6702
has a volatile memory). At switch on IC6702 will not know what to do, but the default condition for the
standby signal IC6702 pin15 is low. Therefore, the power supplies will start, enabling the Main
Processor circuit to function Once IC1001 has reset, and downloaded its data from the EPROM,
IC1001 will communicate with IC6702 via the two opto-couplers (IC6703 & IC6704); downloading
IC6702 software. Once this has finish IC1001 will check the data contained within the NVM's relating
to standby. If it is then decided that the CTV should be in standby mode; IC1001 will instruct IC6702
to take its pin15 high, removing the FET gate voltage from both power supplies.
has a volatile memory). At switch on IC6702 will not know what to do, but the default condition for the
standby signal IC6702 pin15 is low. Therefore, the power supplies will start, enabling the Main
Processor circuit to function Once IC1001 has reset, and downloaded its data from the EPROM,
IC1001 will communicate with IC6702 via the two opto-couplers (IC6703 & IC6704); downloading
IC6702 software. Once this has finish IC1001 will check the data contained within the NVM's relating
to standby. If it is then decided that the CTV should be in standby mode; IC1001 will instruct IC6702
to take its pin15 high, removing the FET gate voltage from both power supplies.
5V
HT
Reset
Reset
L
N
D6704
D6703
R6704
R6703
R6713
R6712
R6705
D6705
R6707
IC6701
R6706
D6701
C5V1
C5V1
C6703
R6715
R6714
Q6701
R6718
R6716
R6717
R6719
Q6702
R6708
C6704
R/C
IC6702
Slave Processor
(Volitile)
Slave Processor
(Volitile)
M1000
R6710
R6709
Key pad
IC6704
IC6703
Standby
15
8
1
4
3
2
6
13
7
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