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1. Deviation Adjustment
1-1. Connections
1)
Connect TP24, TP25 and TP26 of the AFM DEV jig to CN982
of the VC-234 board.
TP24(GND) ................ Pin 8 of CN982
TP25(REC RF) ........... Pin 5 of CN982
TP26(RF SWP) .......... Pin qa of CN982
2)
Connect the audio output terminal (J1 and J2) of the AFM DEV
jig to AUDIO terminal of the unit.
3)
Connect TP28 (DC), TP27 (GND) of the AFM DEV jig to the
DC power supply (+7Vdc to +9Vdc).
1-2. Preparations only for the PLAYER model
Note: PLAYER model:
CCD-TR918E/TRV87E: AEP, UK, EE, NE, RU
1)
Select page: 0, address: 01, and set data: 01.
2)
Only for the PLAYER model, select page: D, address: 14, after
memorizing the data, set the bit value of bit1 to "1". (Refer to
"4-3, 3. Bit value discrimination" of "5-4. Service Mode").
3)
Select page: D, address: 15, and memorize the data.
4)
Only for the PLAYER model, select page: D, address: 15, and
set the bit value of bit7 to "0".
5)
Insert a tape, and set to recording mode. (Use the wireless
remote commander of 8mm VCR, or connect Pin od of IC803
of VC-234 board and GND with 4.7kΩ resistor for a second.)
4.7kΩ resistor: 1-249-425-11
1-3. 1.5 MHz Deviation Adjustment (VC-234 board)
Sets the spectrum of the L-ch ((L+R)/2 signal) level modulated
during recording. If deviated, the crosstalk signal of the audio signal
will occur and the audio level will drop during both playback and
recording.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Switch setting:
Set the AFM DEV jig switches to the following positions.
S1 ........................... BIL Position
S2 ........................... PAL Position
S3 ........................... SIN Position
Adjusting method:
1)
Set to recording mode. (Only for the PLAYER model, refer to
"Preparations only for the PLAYER model".)
2)
Match the vertical ranges of CH1 and CH2 of the oscilloscope
to each other.
3)
Set the oscilloscope to the ADD mode and CH2 to the INV
(invert) mode.
4)
Select page: 0, address: 01, and set data: 01.
5)
Select page: F, address: 7B, change the data and minimize the
audio signal level difference (A).
6)
Press the PAUSE button of the adjustment remote commander.
7)
Select page: 0, address: 01, and set data: 00.
8)
Perform "1.7 MHz Deviation Adjustment" and "Processing
after completed adjustment only for the PLAYER model".
Approx. 2msec
5-49
VTR recording
Input the AFM DEV jig output signal
to the left and right audio input terminal
CH1: AFM DEV jig TP31
CH2: AFM DEV jig TP3
Oscilloscope
ADD mode
CH2 INV mode
F
7B
The level difference between CH1
signal and CH2 signal should be
minimum.
A
Fig. 5-3-19.
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