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Below is a chart showing the ID codes for the current BA-4 chassis.
I D C o d e s f o r t h e B A - 4 C h a s s is
M o d e l
I D - 0 *
I D - 1
K V -
C o u n t r y
1 3 M 4 0
2 5
1
1 3 M 5 0
2 5
3
/ 5 1
2 0 M 4 0
2 5
3
2 0 S 4 0 /
2 5
3
4 1
2 0 V 8 0
2 5
1 9
2 7 S 4 0
1 5 3
1
2 7 S 4 5
1 5 3
2 7
2 7 S 6 5
1 5 3
2 7
* T h e C a n a d ia n v e r s io n is a 9 in s t e a d o f 2 5 a n d 1 2 9 in s t e a d o f 1 5 3 .
Communications with other ICs
After the memory IC003 information is stored in the working static memory
inside IC001, the information is communicated to the Jungle IC301, Tuner
TU101, and audio processor (IC402 if used) to set up all the operating
parameters of the TV.
In this second scope shot, the same data is shown expanded so you can
see there is a space in the clock signal from IC001. It also can be seen
that the memory data and jungle data seem to be alike.
TV ON - Active channel.
Channel 1 – IC301/pin 5; VTIM
Channel 2 – IC001/pin 36; Bi-directional Data
Channel 3 – IC001/pin 39; Clock Output to IC003
Channel 4 – IC001/pin 37; Bi-directional Data
All waveforms at 5V/div.; Time base = 200usec/div.
I D - 2
I D - 3
I D - 4
I D - 5
S t e r e o
0
3
1 9
0
0
3
1 9
1
0
1 3 1
2 3
1
1
1 3 1
2 3
1
1 3
1 3 1
3 1
1
1 3
1 9 5
3 1
1
1 3
1 9 5
3 1
1
2 7
1 5
1 9 5
3 1
59
Channel UP Command
This third scope shot shows that additional data and clock are added to
the communications line when the channel up (+) was pressed. Similar
I D - 6
I D - 7
data is present when other buttons such as video selection, volume and
display are pressed.
0
6 4
1
6 4
7
6 4
TV ON – Remote Channel Up button pressed.
Channel 1 – IC301/pin 5; VTIM
Channel 2 – IC001/pin 36; Bi-directional Data
Channel 3 – IC001/pin 39; Clock Output to IC003
Channel 4 – IC001/pin 37; Bi-directional Data
All waveforms at 5V/div.; Time base = 2msec/div.
Missing VTIM Timing Signals
Unlike previous Sony TV sets, in the BA-4 chassis if the VTIM timing
signal from IC301 were missing, data and clock would still output the
Micro IC001/pins 36-39 and the set would appear to function normally
except there would be no on screen display (OSD). The OSD needs
vertical and horizontal timing pulses for positioning. Without either pulse
the OSD characters would not know where to appear.
The frequency of the data communications when this VTIM signal is miss-
ing is about 50Hz. Normally the data and clock follow the 60Hz VTIM
signal. In the previous Sony TVs, if the VTIM signal were missing, nei-
ther data nor clock would output the Micro. The symptom is that the set
would remain blanked because there is no data to the Jungle IC. This is
no longer true starting with this year's BA-4 TV chassis.
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