Sony GV-A500 Service Manual page 89

7. NTSC Hi8 REC Y Current Adjustment (VC-197 board)
Adjust the Y FM signal recording current.
Mode VTR recording
Signal No signal
Pin 2 of CN207 (REC RF)
Measurement point
Measuring instrument Oscilloscope
(20 MHz BW LIMIT: OFF)
Adjustment page F
Adjustment address 60, 61, 62, 63, 64, 65, 66, 67
Specified value A = 140 ± 5 mVp-p (ME, E, SP mode)
A = 120 ± 5 mVp-p (MP, E, SP mode)
A = 140 ± 5 mVp-p (MP, L, SP mode)
A = 120 ± 5 mVp-p (ME, E, LP mode)
A = 100 ± 5 mVp-p (MP, E, LP mode)
A = 120 ± 5 mVp-p (MP, L, LP mode)
Adjusting method:
1) Set page: 0, address: 01, data: 01.
2) Note down the data of page: F, address: 69, set data: FF, and
press the PAUSE button of the adjusting remote commander.
3) Set page: F, address: 29, data: 01 and press the PAUSE button
of the adjusting remote commander.
4) Note down the data of page: D, address: 10, set data: 06, and
press the PAUSE button of the adjusting remote commander.
5) Set to recording mode.
6) Set page: 3, address: 01, data: 41 and press the PAUSE button
of the adjusting remote commander. (ME, E, SP mode)
7) Change the data of page: F, address: 61, and set the REC Y
signal level (A) to the specified value.
8) Press the PAUSE button of the adjusting remote commander.
9) Read the data (D ) of page: F, address: 61.
61
10) Convert D to a decimal number, to obtain D
61
(Refer to Table 5-1-7. Hexadecimal notation-decimal notation
calculation table.)
11) Calculate the adjustment data (decimal) from the following
equations (decimal calculation), convert it to a hexadecimal
number, and input each adjustment address.
Address: 60 D ´ = D
60 61
Address: 62 D ´ = D
62 61
Address: 63 D ´ = D
63 61
Note : After setting each data, be sure to press the PAUSE
button of the adjusting remote commander.
12) After setting data noted down at step 3) for page: F, address:
69, press the PAUSE button of the adjusting remote commander.
13) After setting data noted down at step 16) for page: F, address:
6B, press the PAUSE button of the adjusting remote
commander.
14) After setting data noted down at step 5) for page: D, address:
10, press the PAUSE button of the adjusting remote commander.
15) Set page: F, address: 29, data: 00 and press the PAUSE button
of the adjusting remote commander.
16) Set page: 3, address: 01, data: 00 and press the PAUSE button
of the adjusting remote commander.
17) Set page: 0, address: 01, data: 00.
0.18 µ sec
Fig. 5-3-14.
´.
61
´
´ + 13
´ + 13
A
8. PAL Hi8 REC Y Current Adjustment (VC-197 board)
Adjust the Y FM signal recording current.
Mode
Signal
Measurement point
Measuring instrument
Adjustment page
Adjustment address
Specified value
Adjusting method:
1) Set page: 0, address: 01, data: 01.
2) Note down the data of page: F, address: 69, set data: FF, and
press the PAUSE button of the adjusting remote commander.
3) Set page: F, address: 29, data: 01 and press the PAUSE button
of the adjusting remote commander.
4) Note down the data of page: D, address: 10, set data: 06, and
press the PAUSE button of the adjusting remote commander.
5) Set to recording mode.
6) Set page: 3, address: 01, data: 41 and press the PAUSE button
of the adjusting remote commander. (ME, E, SP mode)
7) Change the data of page: F, address: 61, and set the REC Y
signal level (A) to the specified value.
8) Press the PAUSE button of the adjusting remote commander.
9) Read the page: F, address: 61, data (D
10) Set page: F, address: 60, 62 and 63, data: D
Note : After setting each data, be sure to press the PAUSE
button of the adjusting remote commander.
11) After setting data noted down at step 3) for page: F, address:
69, press the PAUSE button of the adjusting remote commander.
12) After setting data noted down at step 5) for page: D, address:
10, press the PAUSE button of the adjusting remote commander.
13) Set page: F, address: 29, data: 00 and press the PAUSE button
of the adjusting remote commander.
14) Set page: 3, address: 01, data: 00 and press the PAUSE button
of the adjusting remote commander.
15) Set page: 0, address: 01, data: 00.
0.24 µ sec
5-30
VTR recording (SP mode)
No signal
Pin 2 of CN207 (REC RF)
Oscilloscope
(20 MHz BW LIMIT: OFF)
F
60, 61, 62, 63, 64, 65
A = 185 ± 5 mVp-p (ME, E, SP mode)
A = 150 ± 5 mVp-p (MP, E, SP mode)
A = 160 ± 5 mVp-p (MP, L, SP mode)
).
61
.
61
A
Fig. 5-3-15.