Panasonic TX-21GV1, Руководство по обслуживанию

Страница: 32 / 53

REVIEW / PLAY
S/W PULSE TEST PIN PATH ADJ. JIG
TEST POINTS
ENVELOPE TEST PIN PATH ADJ. JIG
MEASURING EQUIPMENT OSCILLOSCOPE
VR CONTROL PATH ADJ. JIG
ADJUSTMENT
S/T GUIDE ROLLER TAPE TRANSPORTING SYSTEM
1) Connect the PATH ADJ. JIG to PTO1 of the MAIN CIRCUIT BOARD.
2) Play back the ALIGNMENT TAPE (SP COLOUR BAR SIGNAL).
3) Connect the channel-1 scope probe to the S/W PULSE TEST PIN of the PATH ADJ. JIG.
4) Connect the channel-2 scope probe to the ENVELOPE TEST PIN of the PATH ADJ. JIG.
5) Adjust the VR CONTROL of the PATH ADJ. JIG to the centre to obtain the maximum envelope signal of the
ALIGNMENT TAPE.
6) After operating the VCR in the REVIEW MODE about 15 secs, change operation mode from REVIEW MODE to PLAY
MODE and then make sure that the envelope waveform is restored to the maximum condition within 3 seconds.
7) If the requirement is not satisfied, make sure that the TAPE runs normally at the lower part of the T GUIDE POST.
Then adjust the S/T GUIDE ROLLER precisely.
32
Check of transitional operation (from review waveform to play waveform)
Fig.51
ENVELOPE
WAVEFORM
PICTURE