S-Vhs Recording Current Adj; E-E Output Level Adj - Panasonic AG-MD830E Service Manual

4-3-10. E-E OUTPUT LEVEL ADJ.
BOARD VIDEO 2 C.B.A.
TP VIDEO OUT
ADJ
VR3305
TAPE
INPUT COLOUR BAR SIGNAL
MODE E-E
M.EQ WAVE FORM MONITOR
SPEC Y : LEVEL
=
1.0 ± 0.02Vp-p
C : LEVEL
=
0.65 ± 0.15VP-P
[SET UP]
INPUT SW : LINE
1. Supply the colour bar signal to video input.
2. Connect the waveform monitor to video output with
a 750 termination.
3. Adjust VR3305 so that the Y level becomes 1.0
±
0.02Vp-p as shown in Figure E6.
4. Confirm the cyan level are 0:65
±
0.15Vp-p.
VIDEO OUT (75Q) CYAN LEVEL=O.65Vp-p±O.15V
(H. RATE)
-------1
VIDEO LEVEL=
___ 11.0VP-P±o.02VP-P
Figure E6
4-3-11. S-VHS RECORDING CURRENT
ADJ.
BOARD
VIDEO 1 C.B.A.
I
HEAD AMP C.B.A.
TP
TP5003(H)(B-4), TP5002(L)(B-4)
ADJ
VR5001 (REC-Y)(B-4), VR5002(REC-C)(B-4)
TAPE S-VHS BLANK TAPE
INPUT
COLOUR BAR SIGNAL
MODE REC
M.EQ
OSCILLOSCOPE
SPEC
35mVp-p±2mVp-p(C), 150mVp-p±1 OmVp-p(Y)
[SET UP]
S-VHS SW
INPUT
ON
LINE
1. Supply the colour bar signal to video input.
2. Connect the oscilloscope to TP5003 (HOT) and
TP5002 (GND).
3. Place the unit in recording mode with colour bar
signal.
4. Before chrominance recording current adjustment,
luminance recording current (VR5001) should be
closed to observe the chrominance signal.
5. Adjust VR5002 for 35mVp-p
±
2mVp-p as a cyan
level of the chrominance signal as shown in Figure
E7.
6. Next, adjust VR5001 for 150mVp-p
±
10mVp-p as
luminance signal us shown in Figure E8.
T P5003, T P5002
(H. RATE)
Figure E7
CHROMA
LEVEL
3 5 mVp-p
±2mVp-p
TP5003, TP5002
(V. RATE)
150m±~b-+~P_P
111111111111111111111111111111111111111111111111111111111111111
+
V-SYNC
Figure E8
4-5
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