3-4
3.3.5 Video EQ (Frequency response)
Signal
(A1)
•
Ext. S-input
(A2)
•
Video sweep signal
Mode
(B1)
•
S-VHS SP
(B2)
•
S-VHS LP
(B3)
•
Picture Control / Smart Picture
REC : Normal / Natural
PB
: Edit / Distinct
Equipment
(C)
•
Oscilloscope
Measuring point
(D1)
•
Y OUT terminal (75
Ø
terminated)
Frequency marker(D2)
•
3 [MHz]
External trigger
(E)
•
TP111 (D.FF)
EVR mode
(F1)
•
Jig RCU: Code “57”
EVR address
(F2)
•
A:03 (Press remote controller
“0” and “3” keys)
Specified value
(G)
•
SP: 3.6 ± 0.4 div. (–1 ± 1 dB)
•
LP: 3.2 ± 0.4 div. (–2 ± 1 dB)
Adjustment tool
(H)
•
Jig RCU [PTU94023B]
•
Digit-key remote controller
(1) Apply the external trigger signal to D.FF (E) to observe
the Y OUT waveform at the measuring point (D1).
(2) Record the signal (A2) in the mode (B1), and play back
the recorded signal.
(3) Press the channel buttons (+, –) simultaneously to enter
the manual tracking mode. This also brings tracking to
the center (centre).
(4) Set the VCR to the EVR mode by transmitting the code
(F1) from the Jig RCU.
(5) Set the EVR address to (F2) by pressing the button of
the digit-key remote controller.
(6) Set the slope of the oscilloscope to the channel having
higher (D2) marker level of the Y OUT waveform [signal
(A2)]. Then set the 100 kHz marker level to the “4” scale
on the oscilloscope. In this condition, adjust with the chan-
nel buttons (+, –) on the VCR (or on the remote control-
ler) so that the (D2) marker level reaches the specified
value (G).
Fig. 3-3-4b REC color (colour) level
V. rate
Specified
value (G)
100 kHz
Four scale
1 MHz 2 MHz
Frequency
marker (D2)
Specified
value (G)
5 MHz
V. rate
Scale 4
(4 div.)
Fig. 3-3-5a Video EQ (Frequency Response)
(9) Adjust with the channel buttons (+, –) on the VCR (or on
the remote controller) so that the higher level channel be-
comes the specified value (G) of the note "B" level as
shown in Fig. 3-3-4b. (Adjust before recording, then con-
firm it by playing back.)
(10) After adjustment, record the signal (A3) then playing it
back again. At this time, confirm that there is no invert-
ing phenomenon or noise appearing on the playback
screen.
(11) Release the EVR mode of the VCR by transmitting the
code (F1) from the Jig RCU again. (When the EVR mode
is released, the adjusted data is memorized.)
(12) Repeat steps (3) to (11) in the mode (B2).
Note:
• After adjusting, always perform the confirmation and
re-adjustment of the item 3.4.1.
(7) Release the EVR mode of the VCR by transmitting the
code (F1) from the Jig RCU again. (When the EVR mode
is released, the adjusted data is memorized.)
(8) Repeat steps (2) to (7) in the mode (B2).
3.3.6 AUTO PICTURE initial setting
Signal
(A1)
•
Ext. input
(A2)
•
Video: Optional
(A3)
•
VHS tape
Mode
(B)
•
EE
¥
Auto adjust (SP/LP REC
¥
PB)
Adjustment part
(F)
•
Jig RCU : Code “58”
Specified value
(G)
•
STOP mode
Adjustment tool
(H)
•
Jig RCU [PTU94023B]
(1) Insert the cassette tape (A3).
(2) Set the VCR to the Auto adjust mode by transmitting the
code (F) from the Jig RCU. When the VCR enters the
stop mode, the adjustment is completed. When the VCR
enters the eject mode, repeat steps (1) to (2) again.
3.4 DIGITAL CIRCUIT
Note:
• When performing this adjustment, set the VCR to the
HDD mode.
Signal
(A1)
•
Ext. input
(A2)
•
Color(colour) bar signal [PAL]
Mode
(B)
•
EE
Equipment
(C)
•
Oscilloscope
Measuring point
(D)
•
VIDEO OUT terminal (75
Ø
terminaled)
Adjustment part
(F)
•
VR701(DV AGC)
Specified value
(G)
•
1.00 ± 0.02 Vp-p
(1) Observe the VIDEO OUT waveform at the measuring
point (D).
(2) Adjust the adjustment part (F) so that the Y level of the
VIDEO OUT waveform becomes the specified value (G).
3.4.1 HDD EE Y level
Fig. 3-4-1a HDD EE Y level
H. rate
Y level
