Servo Circuit; Switching Point; Slow Tracking Preset; Video Circuit - JVC HR-S6700MS Mode D'emploi

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• When performing the EVR adjustment, confirm that the
FDP indication is changed to the EVR mode, as shown
below.
FDP
Fig. 3-1-5a

3.2 SERVO CIRCUIT

3.2.1 Switching point

Signal (A1) • Stairstep signal
(A2) • Alignment tape(SP, stairstep, PAL) [MHPE]
(A3) • Alignment tape(SP, stairstep, NTSC) [MHP]
Mode (B) • PB
• TBC: OFF
Equipment (C) • Oscilloscope
Measuring point (D1) • VIDEO OUT terminal
(D2) • TP106 (PB. FM)
External trigger (E) • TP111 (D.FF)/slope : –
Adjustment part (F1) • Jig RCU: Code "5A"
(F2) • Jig RCU: Code "51" or "52"
Specified value (G1) • 7.5 ±0.5H
(G2) • 8.0 ±0.5H [MHPE]
• 7.5 ±0.5H [MHP]
Adjustment tool (H) • Jig RCU [PTU94023B]
[HR-S6700MS]
(1) Play back the signal (A1) of the alignment tape (A2).
(2) Apply the external trigger signal to D.FF (E) to observe
the VIDEO OUT waveform and V.PB FM waveform at the
measuring points (D1) and (D2).
(3) Press the channel buttons (+, –) simultaneously to enter
the manual tracking mode. This also brings tracking to
the center (centre).
(4) Adjust tracking by pressing the channel buttons (+, –) so
that the V.PB FM waveform becomes maximum.
(5) Set the VCR to the Auto adjust mode by transmitting the
code (F1) from the Jig RCU. When the VCR enters the
stop mode, the adjustment is completed.
(6) If the VCR enters the eject mode, repeat steps (1) to (5)
again.
(7) Play back the alignment tape (A2) again, confirm that the
switching point is the specified value (G1).
[HR-S7700MS]
(1) Play back the signal (A1) of the alignment tape (A2).
(2) Apply the external trigger signal to D.FF (E) to observe
the VIDEO OUT waveform and V.PB FM waveform at the
measuring points (D1) and (D2).
(3) Press the channel buttons (+, –) simultaneously to enter
the manual tracking mode. This also brings tracking to
the center (centre).
(4) Adjust tracking by pressing the channel buttons (+, -) so
that the V.PB FM waveform becomes maximum.
(5) Transmit the code (F2) from the Jig RCU to adjust so that
the trigger point of the VIDEO OUT waveform is changed
from the trailing edge of the V.sync signal becomes the
specified value (G2).
(6) Set the VCR to the stop mode or eject mode.
(7) Play back the signal (A1) of the alignment tape (A3).
(8) Repeat steps (2) to (6).
3-2
EVR mode
Published in Heiloo Holland
Trigger point
Switching point
Fig. 3-2-1a

3.2.2 Slow tracking preset

Signal (A1) • Ext. input
(A2) • Color (colour) bar signal [PAL]
Mode (B1) • S-VHS SP
(B2) • S-VHS LP
Measuring point (D) • TV-Monitor
Adjustment part (F) • Jig RCU: Code "71" or "72"
Specified value (G) • Minimum noise
Adjustment tool (H) • Jig RCU [PTU94023B]
(1) Record the signal (A2) in the mode (B1), and play back
the recorded signal.
(2) Press the channel buttons (+, –) simultaneously to enter
the manual tracking mode. This also brings tracking to
the center (centre).
(3) Set the VCR to the FWD slow (+1/6x) mode.
(4) Transmit the code (F) from the Jig RCU to adjust so that
the noise bar becomes the specified value (G) on the TV
monitor in the slow mode.
(5) Set the VCR to the Stop mode.
(6) Confirm that the noise bar is (G) on the TV monitor in
the slow mode.
(7) Repeat steps (3) to (6) in the REV slow (–1/6x) mode.
(8) Repeat steps (1) to (7) in the mode (B2).
Note:
• For FWD slow (+1/6x) playback, transmit the code "08"
from the Jig RCU to enter the slow playback mode, and
transmit the code "D0" for REV slow (–1/6x) mode.
3.3

VIDEO CIRCUIT

3.3.1 D/A level

Signal (A1) • Ext. S-input / Ext. input
(A2) • Color (colour) bar signal [PAL]
(A3) • S-VHS tape
Mode (B) • S-VHS
• EE
Equipment (C) • Oscilloscope
Measuring point (D) • Y OUT terminal (75Ø terminated)
Adjustment part (F) [HR-S6700MS]
• VR1201 (D/A LEVEL ADJ) [2D board]
[HR-S7700MS]
• VR1401 (D/A LEVEL ADJ) [3D board]
Specified value (G) • 1.00 ± 0.015 Vp-p (reference value)
(Note)
(1) Insert the cassette tape (A3) to enter the mode (B).
(2) Observe the Y OUT waveform at the measuring point (D).
(3) Check the Y level value when the External S-input (Y/C
separated video signal).
(4) Switch the input signal to the External input (composite
video signal), and adjust the adjustment part (F) so that
the Y level becomes the same value observed in step (3).
V.sync
V. rate
Switching point
8/6/2016