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7. REC Y Current Adjustment (VC-214 board)
Adjust the Y FM signal recording current.
Mode
VTR recording (SP mode)
Signal
No signal
Pin !º of CN910 (REC RF)
Measurement Point
Measuring Instrument
Oscilloscope
(20 MHz BW LIMIT: OFF)
Adjustment Page
F
Adjustment Address
73 to 7A
Specified Value
A=160 ± 5mV
Adjusting method:
1)
Insert a tape, and set to recording mode.
2)
Select page: 0, address: 01, and set data: 01.
3)
Select page: F, address: 7C, after note down the data , set data:
00, and press the PAUSE button of the adjustment remote
commander.
4)
Select page: F, address: 85, after note down the data , set data:
00, and press the PAUSE button of the adjustment remote
commander.
5)
Select page: 2, address: 01, set data: 41, and press the PAUSE
button of the adjustment remote commander.
6)
Select page: F, address: 74 , change the data and set the Y signal
level (A) to the specified value.
7)
Press the PAUSE button of the adjustment remote commander.
8)
Select page: F, address: 74 , and read the data (D
9)
Calculate the adjustment data from the following equations,
and input each adjustment address.
Address: 73
Address: 75
Address: 76
Note: After setting each data, be sure to press the PAUSE button of
the adjustment remote commander.
10) Write the following data in page: F, address: 77 to 7A .
Address
Data
77
6D
78
7C
79
6D
7A
7C
Note: After setting each data, be sure to press the PAUSE button of
the adjustment remote commander.
11) Select page: F, address: 7C, set the data noted down at step 3),
press the PAUSE button of the adjustment remote commander.
12) Select page: F, address: 85, set the data noted down at step 4),
press the PAUSE button of the adjustment remote commander.
13) Select page: 2, address: 01, set data: 00, and press the PAUSE
button of the adjustment remote commander.
14) Select page: 0, address: 01, and set data: 00.
0.18 µ sec
Fig. 5-3-12.
).
74
D
= D
73
74
D
= D
75
74
D
= D
76
74
A
5-39
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