Self-Test; Signal Cable Pin Connections - Tatung CM-1496 Series Service Information

Q2081l3 is "L", R211 is availabe and parallel to R315
(9) SIZE CONTROL OF KODE 4
Q304(PWB-1627) 74LS123 is a monos table multivibrator. We use it to
delay the sync. pulse. In mode 4, the period of vertical sync. is
around 11.6mS. When We delay that pulse for 11.6aS, it becomes a DC
voltage. The DC voltage from Pin 5 will make Q305 saturated. When
0305#C is "L
n
,
0210tC is "H", then 0213#14#13 are connected. R207 is
available and parallel to R340, (R241 is always available when
fH=35KHz) and in series to R241.
(10) SIZE CONTROL OF MODE 5
When the period of sync. pulse is much longer than 11.6mS (e.g 18mS)
There is a negative pulse at 0304#5. Once the pulse in "L"
condition, C322 will discharge by the way of D312 . So, C322 cannot
have enough voltage to saturate 0305 Then, Q213#14#13 will
disconnected and R207 is disabled. Only R241 is available for
adjusting.
5-8 SELF TEST
Self test signal suppied from heater buffered by 0205, 0206, 0207 and
via R214, R215, R216 to the video input to generate full white screen
with black vertical bar on the left and/or right edges. When the display
is connected to a system unit the collector of 0204 is grounded to make
a dark screen.
5-9 SIGNAL CABLE PIN CONNECTIONS:
Pin
Signal Pin Signal
------ ------
1
Red Signal
9
No Pin
2
Green Signal 10 Digital Ground
3
Blue Signal
11
Jumper to Pin 10
4
Jumper tD Pin 10
12
No Pin
5 Self-test 13
Horizontal Sync.
6
Red Return 14 Vertical Sync.
7
Green Return 15 No Pin
8 Blue Return
9
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