JVC SR-VS20E, Service Manual

Page: 66 / 149

3-3
(1) Observe the Y OUT waveform at the measuring point (D).
(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) Adjust with the channel buttons (+, –) on the VCR (or on
the remote controller) so that the Y level of the Y OUT
waveform becomes the specified value (G).
3.3.3 PB Y level (S-VHS / VHS)
Signal (A1)
•
Ext. input
(A2)
•
Color (colour) bar signal [PAL]
Mode (B1)
•
S-VHS SP
(B2)
•
VHS SP
Equipment (C)
•
Oscilloscope
Measuring point (D)
•
Y OUT terminal (75
Ø
terminated)
EVR mode (F1)
•
Jig RCU: Code “57”
EVR address (F2)
•
A:11 (Press remote controller
“1” key twice)
Specified value (G)
•
1.00 ± 0.03 Vp-p
Adjustment tool (H)
•
Jig RCU [PTU94023B]
•
Digit-key remote controller
Signal (A1)
•
Ext. input
(A2)
•
Color (colour) bar signal [PAL]
Mode (B)
•
EE
Equipment (C)
•
Oscilloscope
Measuring point (D)
•
Y OUT terminal (75
Ø
terminated)
EVR mode (F1)
•
Jig RCU: Code “57”
EVR address (F2)
•
A:11 (Press remote controller “1” key twice)
Specified value (G)
•
1.00 ± 0.03 Vp-p
Adjustment tool (H)
•
Jig RCU [PTU94023B]
• Digit-key remote controller
(1) Observe the Y OUT waveform at the measuring point (D).
(2) Set the VCR to the EVR mode by transmitting the code
(F1) from the Jig RCU.
(3) Set the EVR address to (F2) by pressing the button of
the digit-key remote controller.
(4) Adjust with the channel buttons (+, –) on the VCR (or on
the remote controller) so that the Y level of the Y OUT
waveform becomes the specified value (G).
(5) 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.)
Fig. 3-3-2a EE Y level
H. rate
Specified
value (G)
3.3.2 EE Y level
Fig. 3-3-3a PB Y level
H. rate
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).
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.)
(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.