Read Sharp 32JW-74H (serv.man2) Service Manual online
50Hz Widescreen Colour Television – GA20 Chassis
Sharp Electronics (UK) Ltd
Technical Support
Issued June 02
Page 15
Microprocessor
This microprocessor is part of the Micronas VCT38xxA family of Video/Controller/Teletext IC’s.
In addition to the microprocessor section, it contains the video, deflection and teletext processors.
External to this device there is an EPROM in the form of a MTP (IC1002). This device contains the
operating programme. A Non-Volatile Memory (NVM) IC1003 contains all user and engineer settings,.
Note
In addition to the microprocessor section, it contains the video, deflection and teletext processors.
External to this device there is an EPROM in the form of a MTP (IC1002). This device contains the
operating programme. A Non-Volatile Memory (NVM) IC1003 contains all user and engineer settings,.
Note
When replacing the EPROM the NVM should be blank (all locations set to FF) otherwise the
NVM will not pickup the data from the new EPROM
NVM will not pickup the data from the new EPROM
The micro will also communicate with the Multi-Sound Processor (MSP), IF amplifier and the tuner via
the I
2
C bus. The tuner is not a intelligent device therefore, there is no hand shake routine between the
tuner and the micro.
I2C
I
2
C
Mi
c
c
ro
Teletext
Sy
n
c
Video
EPRO
M
IC10
02
NVM
IC
10
03
Horizontal Output
Vertical Output
IC502
RGB Driver
IF Stage
IC201
MSP
IC301
Headphone
Output
IC302
Audio Outputs
IC1301 & IC1302
IC1001
H Out
Vert +
Tuner
Re
se
t
Vert -
S IF
V IF
Left
Right
Left
Right
Protection
HFB
Vprot
H Mute
5v Standby
3v3 Standby
5v
3v3
Re
se
t
R
G
B
Sense
Standby
East/West
I
2
C
S
UPPLIES
Four supplies are connected to various pins of this device:
+5vstby
Produce by IC752 and is present all the time power is applied to the CTV. It
is applied to pins37, 60, and 83
is applied to pins37, 60, and 83
+3.3vstby
Derive from the +5vstby by IC1006 and is present all the time power is
applied to the CTV. It is applied to pins 2, 16, 27 122
applied to the CTV. It is applied to pins 2, 16, 27 122
+5v
Present when the CTV is running and is produced by IC751. It is applied to
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