Switching Position Adjustment (Vc-253 Board); Agc Center Level And Apc & Aeq Adjustment; Preparations Before Adjustments; Agc Center Level Adjustment (Vc-253 Board) - Sony DCR-PC110 Service Manual

3. Switching Position Adjustment (VC-253 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:
Order Page Address Data
1
2 0 01 01
3 3 21
4 3 01 0D
5 3 02
6 3 03
7 0 01 00
Note1: If the data of page: 3, address: 21 is "72", the tape top being played.
After playing the tape for 1 to 2 seconds, stop it, perform step 4
and higher.
Note2: If bit 0 of the 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 values, refer to "5-4. SERVICE MODE", "4-3. 3. Bit value
discrimination".)
When the even channel is defective
Data of page: C, Contents of defect
address: 10
EE Writing into EEPROM (IC852) is defective
E8 Adjustment data is out of range
E7 No data is returned from IC651 (CAIN)
When the odd channel is defective
Data of page: C, Contents of defect
address: 12
EE Writing into EEPROM (IC852) is defective
E8 Adjustment data is out of range
E7 No data is returned from IC651 (CAIN)
PB RF signal is stable
Pin w;
Pin qj
Fig. 5-3-5.
Procedure
Insert the SW/OL reference tape
and enter the VTR STOP mode.
Set the data.
Check that the data is "02".
(Note1)
Set the data, and press PAUSE
button.
Check that the data changes to
"00".
Check that the data is "00".
(Note2)
Set the data.
6.7 msec
4. AGC Center Level and APC & AEQ Adjustment

4-1. Preparations before adjustments

Mode
Subject
Adjusting method:
Order Page Address Data
1 2 30
2

4-2. AGC Center Level Adjustment (VC-253 Board)

Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Note 1: Connect a 75Ω resistor between Pin w; and Pin ql (GND) of
CN263.
75Ω resistor (Parts code: 1-247-804-11)
Adjusting method:
Order Page Address Data
1
2 0 01
3 3 33
4
5 3 01
6 3 02
7 3 03
8
Note2: If the 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.)
Data Contents of defect
20 Perform re-adjustment. (Note 3)
30 The machine is defective
40 Perform re-adjustment. (Note 3)
50 The machine is defective
Note 3: If this data is displayed twice successively, the machine is defective.
5-44
Camera recording
Arbitrary
Procedure
40 Set the data.
Record the camera signal for
three minutes.
Playback
Recorded signal at "Preparations
before adjustments"
Pin w; of CN263 (RF MON) (Note 1)
Ext. trigger: Pin qj of CN263 (SWP)
Oscilloscope
C
1E
The data of page: 3, address: 03 is
"00"
Procedure
Playback the recorded signal at
"Preparations before
adjustments"
01 Set the data.
08 Set the data.
Confirm that the playback RF
signal is stable. (Fig. 5-3-5.)
23 Set the data, and press PAUSE
button.
Check that the data is "00".
Check that the data is "00".
(Note2)
Perform "APC & AEQ
Adjustment".