Rec C/Afm Current Adjustment; Preparations Only For The Player Model; Rec C Current Check (Vc-234 Board) - Sony CCD-TR317 Service Manual

7. REC C/AFM Current Adjustment

Note: PLAYER model:
CCD- TR317/TR517/TRV17/TRV37/TRV47/TRV57/TRV57P/
TRV67

7-1. Preparations only for the PLAYER model

1) Select page: 0, address: 01, and set data: 01.
2) Only for the PLAYER model, select page: D, address: 14, after
memorizing the data, set the bit value of bit1 to "1". (Refer to
"4-3, 3. Bit value discrimination" of "5-4. Service Mode").
3) Select page: D, address: 15, and memorize the data.
4) Only for the PLAYER model, select page: D, address: 15, and
set the bit value of bit7 to "0".
5) Insert a Hi8 ME tape, and set to VTR recording mode. (Use
the wireless remote commander of 8mm VCR, or connect Pin
od of IC803 of VC-234 board and GND with 4.7kΩ resistor
for a second.)
4.7kΩ resistor: 1-249-425-11

7-2. REC C Current Check (VC-234 board)

Check the recording current levels of the REC Chroma signal. If it
is too low, chroma signal noise in played back picture will be
increased. If too high, Y signal noises will increase and white
modulation noises will be produced.
Mode VTR recording (SP mode)
Signal No signal
Measurement Point Pin 0 of CN982 (REC RF)
Measuring Instrument Oscilloscope
(20 MHz BW LIMIT: OFF)
Specified Value A=50.8 ± 3.0mV
Adjusting method:
1) Insert a Hi8 ME tape, and set to recording mode.
2) Select page: 0, address: 01, and set data: 01.
3) Select page: 2, address: 01, set data: 41, and press the PAUSE
button of the adjustment remote commander.
4) Select page: 6, address: 61, and set data: 30.
5) Select page: E, address: FB, set data: 05, and press the PAUSE
button.
6) Select page: F, address: 71, after note down the data, set data:
00, and press the PAUSE button.
7) Check that the REC chroma signal level (A) satisfies the
specified value, and note down the signal level.
8) Select page: F, address: 71, set the data noted down at step 6),
and press the PAUSE button.
9) Select page: E, address: FB, set data: 04, and press the PAUSE
button.
10) Select page: 6, address: 61, and set data: 10.
11) Select page: 2, address: 01, set data: 00, and press the PAUSE
button of the adjustment remote commander.
12) Select page: 0, address: 01, and set data: 00.
13) Perform "REC AFM Current Adjustment" and "Processing after
completed adjustment only for the PLAYER model".
A
5-48
Center of the luminance line width
1.35 µ sec
Fig. 5-3-12