~\;1Z 700
5-2. External recorder playback circuit
When the external recorder is used, connection is made with the 8255 by shorting P-12. In this condition, the write data (8255 PC output) is differentiated and sent to the recorder. In the case of read, the signal peak is chopped by DI and D2 (about O.6V), amplified in the 1.2V limiter (about 1.2V), then amplified to 5V in the next stage amplifier. The phase of the read signal may be inverted with the tape switch after this is to compensate for phase difference owing to the head of the recorder. When proper operation is not attained with an external recorder, adjust the volume control and the tone control knobs to optimum positions. Those which incorporate treble and base for tone control should preferably be set to a flat condition, and those with only a tone control knob, should be set to a high condition.
• 8-Pin DIN connector | | |
I | VIDEO | | |
2 GND | 3 •7~~ |
4 | HSYNC |
'5' | VSYNC | | |
'3' | CSYNC | S' | |
6 | R | 8 4 |
7 G | | 2 |
8 B
•Whenever there is any problem with the display check if all signals are supplied to the colour encoder. Check the waveform of VIDEO OUT.
*Problems may arise if the colour TV is improperly adjusted.
Signal waveform of VIDEO OUT (figures in the drawing represents nominal values)
0 - --
64
6.COLOUR ENCODER
6-1.Colour encoder
•The encoder unit should be replaced as a unit part.
•Input signals
•COLOR Colour sub-carrier wave frequency
•CSYNC Composite synchronizing signal
•HSYNC Horizontal synchronizing signal
•VSYNC Vertical synchronizing signal
•R
•G
•B
•CVIDEO
'X. Rear view
,~
B/W-Colour
sw
I ++6+ ? I
RF CH1- VIDEO 8pin
OUT CH2 OUT Din
SW
