Sony GV-D300 Operating Instructions (primary manual), Service Manual

Page: 79 / 148

5-15
5. AEQ Adjustment (RJ-77 Board)
Mode Recording /playback
(LP mode)
Signal Color bar
Measurement Point CH1: Pin
!¢
of CN9928
(RF MONITOR) on CB-61 board
CH2: Pin
!§
of CN9928 (JSWP) on
CB-61 board
Measuring Instrument Oscilloscope
Trigger source: CH2
Adjustment Page C
Adjustment Address 40, 41, 42, 43, 5A
Note: Connect a 75
Ω
resister between Pin
!¢
(RF MONITOR) and Pin
!£
(GND) of CN9928.
75
Ω
resister (Parts code: 1-247-804-11)
Adjusting method:
1)
Select page: 0, address: 01, and set data: 01.
2) Write the following data in page: C, addresses: 40 to 43, 4B,
5A.
(To write the data, press the PAUSE button of the adjustment
remote commander each time data is set.)
Page: C, address: 40, data: C0
Page: C, address: 41, data: C0
Page: C, address: 42, data: 90
Page: C, address: 43, data: 90
Page: C, address: 4B, data: 80
Page: C, address: 5A, data: 00
3) Record for two minutes from tape top.
4) Rewind the tape, and play back from the tape top.
5) When the RF output stabilizes, select page: 3, address: 01, set
data: 07, and press the PAUSE button of the adjustment remote
commander.
6) About 20 to 30 seconds after pressing the PAUSE button, check
that the data of page: 3, address: 02 changes from “07” to “00”.
7) Check that the data of page: 3, address: 03 is following value.
When “00” : Normal
When “01” : EVENch is faulty
When “02” : ODDch is faulty
When “03” : EVENch and ODDch are faulty
Perform the following procedure only when “00” is displayed.
8) Read the data of page: 3, address: 04 to 07, and take the values
as D
04
, D
05
, D
06
and D
07
.
9) Select page: C, address: 40, set data: D
04
, and press the PAUSE
button of the adjustment remote commander.
10) Select page: C, address: 42, set data: D
05
, and press the PAUSE
button.
11) Select page: C, address: 41, set data: D
06
, and press the PAUSE
button.
12) Select page: C, address: 43, set data: D
07
, and press the PAUSE
button.
13) Select page: C, address: 4B, set data: 00, and press the PAUSE
button.
14) Select page: C, address: 5A, set data: 8C, and press the PAUSE
button.
15) Select page: 0, address: 01, and set data: 00.
6. PLL Capture Range Adjustment (RJ-77 Board)
Mode Recording /playback
(LP mode)
Signal Color bar
Measurement Point CH1: Pin
#¡
of CN9930
(C1ERP) on CB-61 board
CH2: Pin
!§
of CN9928 (JSWP) on
CB-61 board
Measuring Instrument Oscilloscope
Trigger source: CH2
Adjustment Page C
Adjustment Address 46
Adjusting method:
1)
Record for two minutes on any tape.
2) Select page: 0, address: 01, and set data: 01.
3) Write the following data in page: C, address: 4B and 5A.
(To write the data, press the PAUSE button of the adjustment
remote commander each time data is set.)
Page: C, address: 4B, data: 80
Page: C, address: 5A, data: 00
4) Playback the recorded portion.
5) Select page: C, address: 46, set data: 80, and press the PAUSE
button of the adjustment remote commander.
6) Set the data of page: C, address: 46 to “60”, and check that the
pulse is not set at the audio area head of the C1ERP waveform's
ODDch of the oscilloscope (CH1).
7) Set the data of page: C, address: 46 to “A0”, and check that the
pulse is not set at the audio area head of the C1ERP waveform's
ODDch of the oscilloscope (CH1). After confirming steps 6)
and 7), set the data of page: C, address: 46 to “80”, and proceed
to step 12).
8) If the pulse is set in steps 6) and 7), increase the data of page:
C, address: 46 from “80“, and read the data D
1
when the pulse
is set at the audio area head of CH1.
9) Decrease the data of page: C, address: 46 from “80“, and read
the data D
2
when the pulse is set at the audio area head of CH1.
10) Obtain the average value of D
1
and D
2
, and take it as D
3
.
11) Select page: C, address: 46, set data: D
3
, and press the PAUSE
button of the adjustment remote commander.
12) Select page: C, address: 4B, set data: 00, and press the PAUSE
button.
13) Select page: C, address: 5A, set data: 8C, and press the PAUSE
button.
14) Select page: 0, address: 01, and set data: 00.
Fig. 5-3-7
CH1
CH2
CH1
CH2
ODD ch
ODD ch
3.33msec
Pulse is not set at the audio area head.
When the pulse is set at the audio area head.