Servo And Rf System Adjustments; Cap Fg Duty Adjustment (Vc-378 Board); Switching Position Adjustment (Vc-378 Board) - Sony DCR-HC39E Service Manual

3-3.

SERVO AND RF SYSTEM ADJUSTMENTS

Before perform the servo and RF system adjustments, check that
the specified values of "33MHz/27MHz Origin Oscillation check"
of "1-3. CAMERA SYSTEM ADJUSTMENTS" is satisfied.
Check that the data of page: 0, address: 10 is "00". If not, select
page: 0, address: 10, and set the data "00".
Adjusting Procedure:
1. CAP FG duty adjustment
2. Switching position adjustment
3. Error rate check

1. CAP FG Duty Adjustment (VC-378 board)

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Set the CAP FG signal duty cycle to 50% to establish an appropri-
ate capstan servo. If deviated, the uneven rotation of capstan and
noise can occur in the LP mode.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified value
Note 1: Check that the data of page: 0, address: 10 is "00".
Adjusting method:
Order Page Address Data
1
2 0
3 3
4 3
5 3
6 0
Note 2: If the data is "01", adjustment has errors or the mecha-
nism deck is defective.
DCR-HC39E/HC41/HC42/HC42E/HC43/HC43E
VTR stop (PLAY/EDIT mode)
No signal
Displayed data of page: 3, address:
03
Adjusting remote commander
C
16
The data of page: 3, address: 03 is
"00"
Procedure
Close the cassette compart-
ment without inserting
cassette.
01 01
01 1B Press PAUSE button.
Check the data changes in
02 the following order
"1B" t "2B" t "00"
03 Check the data is "00". (Note 2)
01 00

2. Switching Position Adjustment (VC-378 board)

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Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified value
Note 1:Check that the data of page: 0, address: 10 is "00".
Adjusting method:
Order Page Address Data
1
2 0 01
3 C 10
4 3 21
5 3 01
6 3 02
7 3 03
8 0 01
Note 2: If the data is "72", the tape top being played. After play-
ing the tape for 1 to 2 seconds, stop it, perform step 5 and
higher.
If the data is "62", the tape end being played. After re-
wind the tape, perform step 5 and higher.
Note 3: If bit0 of the data is "1", the EVEN channel is defective.
If bit1 of the data is "1", the ODD channel is defective.
Contents of the defect is see written into page: C, ad-
dress: 10 and 12. See following table.
(For the bit values, refer to "6-4. SERVICE MODE", "4-
3. 3. Bit value discrimination".)
If bit3 of the data is "1", the tape end being played, so
rewind the tape and perform the adjustment again.
When the EVEN channel is defective
Data of page: C,
address: 10
EE
E8
E7
When the ODD channel is defective
Data of page: C,
address: 12
EE
E8
E7
6-49
VTR playback (PLAY/EDIT mode)
SW/OL standard (XH2-3)
Displayed data of page: 3, address:
03
Adjusting remote commander
C
10, 11, 12, 13
The data of page: 3, address: 03 is
"00"
Procedure
Insert the SW/OL standard
tape and enter the VTR stop
mode.
01
EE Press PAUSE button.
Check the data is "02". (Note 2)
0D Press PAUSE button.
Check the data changes to "00".
Check the data is "00". (Note 3)
00
Contents of defect
Writing into EEP ROM (IC5302) is
defective
Adjustment data is out of range
No data is returned from IC4201
Contents of defect
Writing into EEP ROM (IC5302) is
defective
Adjustment data is out of range
No data is returned from IC4201