Switching Position Adjustment (Vi-151 Board); Agc Center Level Adjustment (Vi-151 Board) - Sony DCR-TRV890E Service Manual

4. Switching Position Adjustment (VI-151 board)

Mode VTR playback
Signal SW/OL reference tape (XH2-3)
Measurement Point Display data of page: 3, address: 03
Measuring Instrument Adjustment remote commander
Adjustment Page C
Adjustment Address 10, 11, 12, 13
Specified Value 00
Adjusting Method:
1) Insert the SW/OL reference tape and enter the VTR STOP
mode.
2) Select page: 0, address: 01, and set data: 01.
3) Select page: 3, address: 21, and check that the data is "02".
Note: If the data of page: 3, address: 21 is "72", the tape top is being
played. After playing the tape for 1 to 2 seconds, perform step
4 and higher.
4) Select page: 3, address: 01, set data: 0D, and press the PAUSE
button of the adjustment remote commander.
5) Select page: 3, address: 02, and check the data is changed to
"00".
6) Select page: 3, address: 03, and check that the data is "00".
Note: If bit 0 of page: 3, address: 03 data is "1", the even channel is
defective. If bit 1 is "1", the odd channel is defective. Contents
of the defect is written into page: C, addresses: 10 and 12. See
the following table. (For the bit value, refer to "5-4. SERVICE
MODE", "4-3. 3. Bit value discrimination".)
7) Select page: 0, address: 01, and set data: 00.
When the even channel is defective
Data of page: C,
address: 10
EE Writing into EEPROM (IC2404) is defective
E8 Adjustment data is out of range
E7 No data is returned from IC1900 (TRX)
When the odd channel is defective
Data of page: C,
address: 12
EE Writing into EEPROM (IC2404) is defective
E8 Adjustment data is out of range
E7 No data is returned from IC1900 (TRX)
Contents of defect
Contents of defect

5. AGC Center Level Adjustment (VI-151 board)

Mode
Subject
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Note 1: Connect a 75 Ω resistor between Pin @º and Pin !ª (GND) of
CN2904.
75 Ω resistor (Parts code: 1-247-804-11)
Adjusting Method:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: 2, address: 30, and set data: 40.
3) Record the camera signal for a minute.
4) Playback the recorded segment.
5) Select page: 3, address: 33, and set data: 08.
6) Confirm that the playback RF signal is stable.
7) Select page: 3, address: 01, set data: 23, and press the PAUSE
button of the adjustment remote commander.
8) Select page: 3, address: 02, and check that the data is "00".
9) Select page: 3, address: 03, and check that the data is "00".
Note: If data of page: 3, address: 03 is other than "00", adjustment
has errors. (Take an appropriate remedial measures according
to the errors referring to the following table.)
10) Select page: 3, address: 33, and set data: 00.
11) Select page: 2, address: 30, and set data: 00.
12) Select page: 0, address: 01, and set data: 00.
Data of page: 3,
address: 03
20 Perform re-adjustment. (Note 2)
30 The machine is defective
40 Perform re-adjustment. (Note 2)
50 The machine is defective
Note 2: If this data is displayed twice successively, the machine is defective.
5-43
Camera record and playback
Arbitrary
Pin @º of CN2904 (RF MON) (Note 1)
Oscilloscope
C
1E
The display data of page: 3, address:
03 is "00"
Remedial measures