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Servo And Rf System Adjustment; Cap Fg Duty Adjustment (vc-291 Board) - Sony DCR-IP45 Service Manual

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DCR-IP45/IP45E/IP55/IP55E
3-3.

SERVO AND RF SYSTEM ADJUSTMENT

Before perform the servo and RF system adjustments, check that
the specified value of "54MHz/66MHz Origin Oscillation
Adjustment" of "CAMERA SYSTEM ADJUSTMENT" is satisfied.
And check that the data of page: 0, address: 10 is "00". If not, set
data: 00 to this address.
Note: NTSC model: DCR-IP45/IP55
PAL model: DCR-IP45E/IP55E
Switch setting:
POWER ........................................................................... VCR
Adjusting Procedure:
1.
Cap FG duty adjustment
2.
Treel duty adjustment
3.
Read clock fo adjustment
4.
Switching position adjustment
5.
XREC ACT adjustment
6.
Timing ATF center value
7.
AGC adjustment and AEQ & LMS adjustment
8.
Error rate check

1. Cap FG Duty Adjustment (VC-291 Board)

Set the Cap FG signal duty cycle to 50% to establish an appropriate
capstan servo. If deviated, the uneven rotation of capstan and noise
can occur.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Note1: The data of page: 0, address: 10 must be "00".
Adjusting method:
Order Page Address Data
1
2
0
01
3
3
0A
4
3
0B
5
0
01
Note2: If the data changes to "FF", adjustment has errors. Contents of the
error is written into page: 3, addresses: 0C. See the following table.
Data of page: 3,
address: 0C
Mechanism mode error (For example, the
01
adjustment is performed in the mode except
for the play back mode.)
Adjustment mode error (The data of page: 3,
02
address: 0A was changed during the
adjustment.)
Data setting error (The data of page: 0,
03
address: 01 was not "01".)
DCFG (IC1401 4 pin) duty adjustment
04
error
ACFG (IC1301 wa , wd pin) duty adjustment
05
error
06
DCFG and ACFG duty adjustment error
5-52
Playback
Arbitrary tape
Data of page: 3, address: 0B
Adjustment remote commander
C
10 to 13, 1A to 1C, 1F, 2E
00
Procedure
Play back arbitrary tape.
01
Set the data.
10
Set the data, and press PAUSE
button.
Check that the data changes
from "10" to "00".
If the data changes to "FF",
there are errors. (Note2)
00
Set the data.
Contents of error

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