1. 1.5 MHz Deviation Adjustment (VC-195 board)2. 1.7 MHz Deviation Adjustment (VC-195 board)
Sets the spectrum of the L-ch ((L+R)/2 signal) leSets the spectrvel modulatedum of the R-ch ((L-R)/2 signal) level modulated during
during recording. If deviated, the crosstalk signal of the audio signalrecording. If deviated, the crosstalk signal of the audio signal will
will occur and the audio level will drop during both playback andoccur and the audio level will drop during both playback and
recording.recording.
ModeVTR recordingModeVTR recording
SignalInput the AFM DEV jig output signal toSignalInput the AFM DEV jig output signal to
the left and right audio input terminalthe left and right audio input terminal
Measurement PointCH1: AFM DEV jig TP31Measurement PointCH1: AFM DEV jig TP32
CH2: AFM DEV jig TP3CH2: AFM DEV jig TP2
Measuring Instrument OscilloscopeMeasuring Instrument Oscilloscope
ADD modeADD mode
CH2 INV modeCH2 normal mode
Adjustment PageFAdjustment PageF
Adjustment Address45Adjustment Address46
Specified ValueThe level difference between CH1 signalSpecified ValueThe level difference between CH1 signal
and CH2 signal should be minimum.and CH2 signal should be minimum.
Connection:Connection:
1) Connect TP24 and TP26 of the AFM DEV jig to CN910 of the1) Connect TP24 and TP26 of the AFM DEV jig to CN910 of the
VC-195 board.VC-195 board.
TP24(GND) ......................8 of CN910Pin TP24 (GND) .....................8 of CN910Pin
TP26(RF SWP) .................!� of CN910Pin TP26 (RF SWP) ................!� of CN910Pin
2) Connect TP25 (REC AFM) of the AFM DEV jig to Pin @? of2) Connect TP25 (REC AFM) of the AFM DEV jig to Pin @? of
IC301 with a 0.01mF capacitor (1-101-004-00).IC301 with a 0.01mF capacitor (1-101-004-00).
3) Connect the audio output terminal (J1 and J2) of the 3) Connect the audio output terAFM DEVminal (J1 and J2) of the AFM DEV
jig to AUDIO terminal of the unit.jig to AUDIO terminal of the unit.
4) Connect TP28 (DC), TP27 (GND) of the AFM DEV jig to the4) Connect TP28 (DC), TP27 (GND) of the AFM DEV jig to the
DC power supply (+7Vdc to +9Vdc).DC power supply (+7Vdc to +9Vdc).
5) Set the AFM DEV jig switches to the following positions.5) Set the AFM DEV jig switches to the following positions.
S1 ............................... BIL PositionS1 ............................... BIL Position
S2 ............................... NT PositionS2 ............................... NT Position
S3 ............................... SIN PositionS3 ............................... INV Position
Adjusting method :Adjusting method :
1) Match the vertical ranges of CH1 and CH2 of the oscilloscope1) Match the vertical ranges of CH1 and CH2 of the oscilloscope
to each other.to each other.
2) Set the oscilloscope to the ADD mode and CH2 to the INV2) Set the oscilloscope to the ADD mode and CH2 to the normal
(invert) mode.mode.
3) Select page: 0, address: 01, and set data: 01.3) Select page: 0, address: 01, and set data: 01.
4) Select page: F, address: 45, change the data and minimiz4) Select pae thege: F, address: 46, change the data and minimize the
audio signal level difference (A).audio signal level difference (A).
5) Press the PAUSE button of the adjusting remote commander5) Press the P.AUSE button of the adjusting remote commander.
6) Select page: 0, address: 01, and set data: 00.6) Select page: 0, address: 01, and set data: 00.
AA
Approx. 2 msecApprox. 2 msec
Fig. 5-3-23.Fig. 5-3-24.
5-49 |
ACEC
