Panasonic AJ-YA120AG, Service Manual

Page: 148 / 647

ELE-18
6-5. CUE Noise Cancel Adj.
(HDSP
Mode)
BOARD
RF/CUE
TP
LINE OUT (CH3)
ADJ. VR4306 [C LV18]
VR4301 [C PS18]
INPUT ---
MODE
PLAY
TAPE
VFM3783KML
M. EQ Monitor TV, Oscilloscope,
Audio Analyzer
SPEC. AJ-HD1200AP/E : -40dBu or Less
AJ-HD1200AMC : -36dBu or Less
<Audio Analyzer Setting>
Set the Audio Analyzer as shown below.
MEASURE: BANDPASS
BP/BR FREQ: 1200Hz
FILTER: OFF
1. Play back the portion after 10 unites of the
Alignment Tape (VFM3783KML/ Without Cue
Audio).
2. Adjust VR4306 and VR4301 alternately for 3-4
times to minimize the noise level.
6-6. CUE Noise Cancel Adj.
(50M
Mode)
BOARD
RF/CUE
TP
LINE OUT (CH3)
ADJ.
VR4305 [C LV9]
VR4302 [C PS9]
INPUT ---
MODE PLAY
TAPE
M. EQ
SPEC. Less than -36dBu
<Audio Analyzer Setting>
Set the Audio Analyzer as shown below.
MEASURE: BANDPASS
BP/BR FREQ: 600Hz
FILTER: OFF
1. Create a 50M recorded tape without the CUE
audio by any other DVCPRO50.
And play back the recorded portion.
2. Adjust VR4305 and VR4302 alternately 3-4 times
to minimize the noise level.
6-7. CUE Bias Current Adj.
BOARD
RF/CUE
TP
LINE OUT (CH3)
ADJ. VR4001 [CUE BIAS]
INPUT LINE IN (CH1, CH2),
AJ-HD1200AP/E : 1KHz, 0 dBu
AJ-HD1200AMC : 1KHz, +4 dBu
MODE
REC
→
PLAY
TAPE Blank Tape
M. EQ
Audio Analyzer
SPEC.
Maximum Output of Self-Recording/Playback
Within -0.5dB
<Audio Analyzer Setting>
Set the Audio Analyzer as shown below.
MEASURE: BANDPASS
BP/BR FREQ: 600Hz
FILTER: OFF
1. Set VR4001 fully CCW position.
2. Reset the front CTL counter to “0”.
3. Supply the above 1 KHz sine wave signal to the
LINE IN CH1 and CH2.
4. Place the unit in the record mode and rotate
VR4001 by 45 degrees for every fixed time at a
time as shown the table below.
Rotation of
VR4001
Recording Time
(CTL Counter) [Example]
0° (Fully CCW) 00:00:00 - 00:30:00
45° 00:30:00 - 01:00:00
90° 01:00:00 - 01:30:00
135° 01:30:00 - 02:00:00
180° 02:00:00 - 02:30:00
225° 02:30:00 - 03:00:00
270° 03:00:00 - 03:30:00
315° (Fully CW) 03:30:00 – 04:00:00
5. Play back the portion just recorded and set
VR4001 at the point where the Play back the
portion recorded and set VR4001 as the point
where the maximum CH3 output.
6. maximum CH3 output.