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I. REVIEW
¤ ¤ A A PLAY (See Fig. 5-10)
TEST POINTS
MEASURING EQUIPMENT
ADJUSTMENT
a. Connect the PATH ADJ. FIXTURE to PT01 of the MAIN CIRCUIT BOARD.
b. Play back the ALIGNMENT TAPE (SP , COLOR BAR SIGNAL).
c. Connect the channel-1 scope probe to the S/W PULSE TEST PIN of the PATH ADJ. FIXTURE.
d. Connect the channel-2 scope probe to the ENVELOPE TEST PIN of the PATH ADJ. FIXTURE.
e. Adjust the VR CONTROL of the PATH ADJ. FIXTURE to the center to obtain the maximum envelope
signal of the ALIGNMENT TAPE.
f. After operating the VCR in the REVIEW MODE about 15 secs, change the REVIEW MODE to the
PLAY BACK MODE.
g. 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.
h. If the requirement is not satisfied, make sure that the TAPE runs normal at the lower part of the T
GUIDE POST. Then adjust the S/T GUIDE ROLLER precisely.
WAVEFORM
Fig. 5-10 CHECK OF TRANSITIONAL OPERATION (FROM REVIEW WAVEFORM TO PLAY WAVEFORM)
S/W PULSE TEST PIN
ENVELOPE TEST PIN
OSCILLOSCOPE
VR CONTROL
S/T GUIDE ROLLER
PICTURE
34
PATH ADJ. FIXTURE
PATH ADJ. FIXTURE
PATH ADJ. FIXTURE
TAPE TRANSPORTIN SYSTEM
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