Confirmation Of Envelope On Rev, Rew And Ff Mode; Confirmation Of Play Start Envelope - Panasonic DVCPRO50 Service Manual

3-23. Confirmation of Envelope on
REV, REW and FF mode
SPEC
See Figure 3-23-1
TEST POINT
See below
MODE
REV, REW, FF
TAPE NTSC : VFM3580KM or VFM3580KL
(PAL : VFM3680KM or VFM3680KL)
M. EQ
Oscilloscope
(Test Point)
Signal
(1) R/P ENV L
(2) R/P HSW L
Table 3-23-1
1. Confirm that the Envelope waveform becomes in
the specification at REV, REW and FF mode as
following.
⋅
Waveform must be Diamond Style.
(Figure 3-23-1)
⋅
All the peak level must be more than 90% of
maximum level.
V/Vmax ≥ 0.9
2. If it is out of spec, adjust S4 post height. (refer to
item "3-1.Post Height Pre-Adjustment")
Figure 3-23-1
Test Point
TP6301 : RF (F8)
TP233 : SERVO (F7)
MECH-18
3-24. Confirmation of Play Start
Envelope
SPEC
Envelope Waveform signal should be
rising up immediately at PLAY mode.
TEST POINT
Refer to Table 3-23-1 on previous item
"3-23. Confirmation of Envelope on
REV/REW and FF mode".
REW/REV → PLAY, FF → PLAY,
MODE
Loading completion (STOP) → PLAY
L Cassette (123min, Recorded tape)
TAPE
Tape beginning portion
M. EQ
Oscilloscope
This adjustment must be done after Envelope
Waveform Adjustment.
1. Confirm that the envelope appears immediately
when the mode is changed from REW to PLAY,
REV to PLAY, FF to PLAY, and STOP to PLAY
mode.
2. If not, adjust S4 post height. (refer to item "Post
Height Pre-Adjustment")
Figure 3-24-1