Rec Y Current Adjustment (Vc-234 Board) - Sony CCD-TR317E Service Manual

6. REC Y Current Adjustment (VC-234 board)

Adjust the Y FM signal recording current.
Mode VTR recording (SP mode)
Signal No signal
Measurement Point Pin 0 of CN982 (REC RF)
Measuring Instrument Oscilloscope
(20 MHz BW LIMIT: OFF)
Adjustment Page F
Adjustment Address 6A, 6B
Specified Value A=280 ± 5mV (Hi8 model)
A=250 ± 5mV (Standard 8 model)
Note: PLAYER model:
CCD-TR317E/TR417E/TR427E/TR617E/TR717E/TR918E/
TRV37E/TRV47E/TRV48E/TRV57E/TRV67E/
TRV87E :AEP, UK, EE, NE, RU
Hi8 model:
CCD-TR717E/TR918E/TRV67E/TRV87E
Standard8 model:
CCD- TR317E/TR417E/TR427E/TR617E/TRV37E/TRV47E/
TRV47E/TRV48E/TRV57E
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 tape, and set to 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
Adjusting method:
1) Insert a tape, and set to recording mode.
2) Select page: 0, address: 01, and set data: 01.
3) Select page: E, address: FB, set data: 06, and press the PAUSE
button of the adjustment remote commander.
4) Select page: F, address: 71, after note down the data, set data:
00, and press the PAUSE button.
5) Select page: 2, address: 01, set data: 41, and press the PAUSE
button of the adjustment remote commander.
6) Select page: 6, address: 63, and set data: 01.
7) Select page: F, address: 6B, change the data and set the Y signal
level (A) to the specified value.
8) Press the PAUSE button.
9) Select page: F, address: 6A, and set the same data as page: F,
address: 6B, and press the PAUSE button.
10) Only for Hi8 model, select page: F, address: 6B, and read the
data (D ).
6B
11) Only for Hi8 model, convert D
D '. (Refer to tabel 5-4-1. Hexadecimal-decimal conversion
6B
table.)
12) Only for Hi8 model, calculate D
(Decimal calculation), convert it to a hexadecimal number, and
input to page: 7, address: F9.
When D ' 243 (When D
6B
D ' = 255 (D
F9
When D ' < 243 (When D
6B
D ' = D
F9 6B
13) Press the PAUSE button.
7
F9
to decimal notation, and obtain
6B
' using following equations
F9
F3)
6B
= FF)
F9
< F3)
6B
' + 12
14) Select page: F, address: 71, set the data noted down at step 4),
and press the PAUSE button.
15) Select page: E, address: FB, set data: 04, and press the PAUSE
button.
16) Select page: 6, address: 63, and set data: 00.
17) Select page: 2, address: 01, set data: 00, and press the PAUSE
button of the adjustment remote commander.
18) Select page: 0, address: 01, and set data: 00.
Processing after completed adjustment only for 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, and
set the data memorized at step 2) of "Preparations only for the
PLAYER model".
3) Press the PAUSE button.
4) Only for the PLAYER model, select page: D, address: 15, and
set the data memorized at step 3) of "Preparations only for the
PLAYER model".
5) Press the PAUSE button.
6) Select page: 0, address: 01, and set data: 00.
0.18 µ sec
VC-234 BOARD
5-43
A
Fig. 5-3-10.
50 26
51
IC803
75
76 100
Fig. 5-3-11.
25
1