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).
(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).
(1) Connect the adjustment tool (H3) to the measuring point (D1).
(2) Apply the external trigger signal to D.FF (E) to observe the
PB color (colour) waveform at the measuring point (D2).
(3) Play back the signal (A3) in the mode (B1) of the align-
ment tape (A1).
(4) Press the channel buttons (+, –) simultaneously to enter
the manual tracking mode. This also brings tracking to
the center (centre).
(5) Adjust tracking by pressing the channel buttons (+, –) so
that the PB color (colour) waveform becomes maximum.
Make a note of the higher PB color (colour) level as “B”
at this time.
(6) Record the signal (A3) in the mode (B1), and play back
the recorded signal.
(7) Set the VCR to the EVR mode by transmitting the code
(F1) from the Jig RCU.
(8) Set the EVR address to (F2) by pressing the button of
the digit-key remote controller.
(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).
Fig. 3-3-4a LPF
1 k
Ø
39
µ
H
180
µ
H
120 pF
180 pF
PB. FM
629 [kHz]
PB COLOR
(PB COLOUR)
3.3.4
REC color (colour) level
Signal
(A1)
•
Alignment tape(S-VHS, SP/LP, Color(colour)
bar) [MH-2H]
(A2)
•
Ext. input
(A3)
•
Color (colour) bar signal [PAL]
Mode
(B1)
•
S-VHS SP
(B2)
•
S-VHS LP
Equipment
(C)
•
Oscilloscope
Measuring point
(D1)
•
TP106 (PB. FM)
(D2)
•
PB color (colour) output of the LPF
External trigger
(E)
•
TP111 (D.FF)
EVR mode
(F1)
•
Jig RCU: Code “57”
EVR address
(F2)
•
A:02 (Press remote controller
“0” and “2” keys)
Specified value
(G)
•
SP: “B” x 125 ± 5%
•
LP: “B” x 125 ± 5%
Adjustment tool
(H1)
•
Jig RCU [PTU94023B]
(H2)
•
Digit-key remote controller
(H3)
• LPF [PTU93006] (See Fig. 3-3-4a.)
Fig. 3-3-4b REC color (colour) level
V. rate
Specified
value (G)
Note:
• After adjusting, always perform the confirmation and
re-adjustment of the item 3.4.1.
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)
