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11. REC C Current Adjustment (VC-215 board)
Set the recording current levels of the REC Chroma signal. If it is
too low, chroma signal noise in played back picture will increased.
If too high, Y signal noises will increase and white modulation noises
will be produced.
Mode
VTR recording (SP mode)
Signal
No signal
Pin !º of CN910 (REC RF)
Measurement Point
Measuring Instrument
Oscilloscope
Adjustment Page
F
Adjustment Address
65
Specified Value
Hi8 model :
A = 34.6±1.2mV
Standard8 model :
A = 30.0±1.1mV
Note 1: Hi8 model: CCD- TR515E/TR516E/TR713E
CCD-TRV36E/TRV46E
Standard8 model: CCD-TR315E/TR415E/TR425E
CCD-TRV16E/TRV26E/TRV27E/
Connection:
1) Remove C085 (0.01µF, Pin !§ of IC202).
Note: After completing "REC L Level Adjustment" and "REC C
Current Adjustment", replace C085 with new parts (1-162-
970-11 CERAMIC CHIP 0.01µF 10% 25V).
2) Connect Pin 1 of IC001 and GND with a 0.01F capacitor.
0.01µF capacitor: 1-101-004-00
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: D, address: 14, after memorizing the data, set the
bit value of bit1 to "1". (Refer to "3. Bit value discrimination"
of "3-1-8. Service mode").
3) Select page: D, address: 15, after memorizing the data , set the
bit value of bit7 to "0".
4) Set to recording mode. (Use the wireless remote commander
of 8mm VCR, or connect Pin 6 of CN935 of DD-117 board
and GND with 4.7kΩ registor for a second.)
4.7kΩ registor : 1-249-425-11
5) Insert a tape, set to recording mode.
6) Select page: 0, address: 01, and set data: 01.
7) Select page: 3, address: 01, set data: 41, and press the PAUSE
button of the adjusting remote commander.
8) Select page: 2, address: 61, and set data: 30.
9) Select page: F, address: 65, change the data and set the REC
chroma signal level (A) to the specified value.
10) Press the PAUSE button of the adjusting remote commander.
11) Select page: 2, address: 61, and set data: 10.
12) Select page: 3, address: 01, set data: 00, and press the PAUSE
button of the adjusting remote commander.
13) Select page: 0, address: 01, and set data: 00.
14) Select page: 0, address: 01, and set data: 01.
15) Select page: D, address: 14, and set the data memorized at step
2) of "Preparations only for the model without REC switch".
16) Press the PAUSE button of the adjusting remote commander.
17) Select page: D, address: 15, and set the data memorized.
18) Press the PAUSE button of the adjusting remote commander.
19) Select page: 0, address: 01, and set data: 00.
TRV27EP
5-55
Center of the luminance line width
1.35 µ sec
Fig. 5-3-16.
A
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