Auto Picture Initial Setting; Dv Ee Y Level; Audio Circuit; Audio Rec Fm - JVC SR-VS30U Service Manual

3.3.5 Auto picture initial setting

•
Signal (A1) Ext. input
•
(A2) Video: Optional
•
(A3) VHS tape
•
EE ¥ Auto adjust (SP/EP REC ¥ PB)
Mode (B)
•
Adjustment part (F) Jig 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.

3.3.6 DV EE Y level

Signal (A1) • Ext. input
(A2) • Color (colour) bar signal [NTSC]
Mode (B) • VHS
• EE
Equipment (C) • Oscilloscope
Measuring point (D) • TP701 (DV AGC)
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).
Note:
• After adjusting, always perform the confirmation and
re-adjustment of the Electrical adjustment (DV).
Fig. 3-3-6a DV EE Y level

3.4 Audio circuit

Notes:
• This adjustment should be done after the "REC color
(colour) level adjustment" for the video circuit has
been completed.
• GND (Ground) should be taken from the Tuner shield
case.

3.4.1 Audio REC FM

•
Signal (A1) Ext. input
•
(A2) Audio: No signal
•
(A3) Video: Color (colour) bar signal [NTSC]
•
Mode (B) S-VHS EP
•
Equipment (C) Oscilloscope
•
Measuring point (D) TP2253 (A. PB. FM)
•
External trigger (E) TP111 (D.FF)
•
EVR mode (F1) Jig code "57"
•
EVR address (F2) A : 30
•
(F3) Jig code "23" and "20"
•
(F4) Jig code "18" or "19" (Channel +/-)
•
Specified value (G1) 500 ± 100 mVp-p
•
(G2) More than 350 mVp-p
•
Adjustment tool (H) Jig RCU [PTU94023B]
(1) Apply the external trigger signal to D.FF (E) to observe
the Audio PB FM waveform at the measuring point (D).
(2) Record the signal (A3) with no audio signal input in the
mode (B), and play back the recorded signal.
(3) Set the VCR to the manual tracking mode.
(4) If the A.PB FM level is not within the specified value (G1),
perform the adjustment in a following procedure.
(5) Set the VCR to the EVR mode by transmitting the code
(F1) from the Jig RCU.
(6) Set the EVR address to (F2) by transmitting the code (F3)
from the Jig RCU.
(7) Transmit the code (F4) from the Jig RCU to adjust so that
the A.PB FM level of the higher channel level becomes
the specified value (G1). (Adjust before recording, then
confirm it by playing back.)
(8) If the specified value (G1) is not obtained, transmit the
code (F4) from the Jig RCU to adjust so that the wave-
form level of the lower channel level becomes the speci-
fied value (G2). (Adjust before recording, then confirm it
by playing back.)
(9) 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.)
Specified
value (G2)
Specified
value (G)
H. rate
V. rate
Fig. 3-4-1a Audio REC FM
Specified
value (G1)
3-4