Panasonic AG-7350 Series - Audio Section; Preamp Level Adjustment (for Ag-7350); Normal Audio Playback Frequency Response; Audio Meter Adjustment (for Ag-7350)

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AUDIO SECTION
5-3-45. PREAMP LEVEL ADJUSTMENT
(FOR AG-7350)
TP ADJ. MODE INPUT
NORMAL AUDIO
OUT (CH1, CH2) VR4501, VR4502,
PAL 1kHz, -8dBv
Hi-Fi AUDIO OUT
VR4701, VR4702 STOP SINEWAVE
(CH1,CH2)
TAPE M. EO. SPEC.
BLANK
V.T.V.M
NORMAL: -8dBv±0.2dBv
TAPE
Hi-Fi: -8dBv±2dBv
1. Set the signal generator output to 1kHz, -SdBv
and supply it to the Normai/Hi-Fi (CH1 & CH2)
audio inputs and also supply a colour bar
signal to the video input.
2. Set the Audio out SW to the NORM position.
Adjust VR4501 (CH1) and VR4502 (CH2) for -SdBv
+/-0.2dBv.
3. Set the Audio out SW to the Hi-Fi position.
Adjust VR4701 (CH1) and VR4702 (CH2) for -SdBv
+/-2dBv.
5-3-46. AUDIO METER ADJUSTMENT
(AG-7350)
TP ADJ.
MODE INPUT
AUDIO METERS
VR4503
PAL 1kHz, -8dBv
CH1
CH2
VR4504
STOP SINEWAVE
TAPE
M. EQ.
SPEC.
BLANK
AUDIO
NORMAL: 0Vu±0.5Vu
1.
2.
3.
4.
5.
TAPE METERS
Hi-Fi: OVu
Set the signal generator output to 1kHz, -SdBv
and supply it to the CH1/CH2 inputs a"d also
supply a colour bar signal to the video ir"Jut.
Set the Audio Output SW to the Hi -F i .
Adjust VR4503 (CH1) and VR4504 (CH2) so that
the CH1 and CH2 audio meters show OVU.
Change the Audio Output SW 10 the Normal.
Confirm that the audio meters show OVU +/-
0.5VU.
5-3-47. NORMAL AUDIO PLAYBACK FREQUENCY
RESPONSE
ADJUSTMENT
TP ADJ.
MODE INPUT
NORM/Hi-Fi VR4005 (CH1) PAL
C><
OUT (CH1/CH2) VR4007 (CH2)
PLAY
TAPE M. EQ. SPEC.
VFM8180HADH OSCILLO-
400Hz=5kHz (+/- 0.5dB)
POSITON 3 SCOPE
Note: This adjustment should be always completed
before the Normal Audio
Playback Gain
Adjustment.
1. Play back the alignment tape at portion 3.
2. Connect the oscilloscope to the NORM/H1-Fi
outputs (CH1/CH2) on the rear panel.
5-18
3. Adjust VR4005 (CH 1) and VR4007 (CH2) so that
the 400Hz and 5kHz levels become the same (0
+/-0.5dB) as shown in Figure E45.
NORM/Hi-Fi OUT
(CH1/CH2)
400Hz
5kHz
400Hz= 5kHz (±0.5dB)
Figure E45
5-3-48. NORMAL AUDIO PLAYBACK GAIN
ADJUSTMENT
TP
ADJ. MODE
INPUT
NORM/Hi-Fi VR4006 (CH1) PAL
C><
OUT (CH1/CH2)
VR4008 (CH2)
PLAY
TAPE M. EQ.
SPEC.
1kHz, -8dBv
OSCILLO-
RECORDED
SCOPE
300mVp-p
TAPE
Note: Th1s adjustment should be completed after
completion of the Audio Meter Adjustment and
Norma I Audio Play back Frequency Adjustment
1. Prepare the prercorded tape which recorded a
audio 1kHz, -SdBv signal on another unit such
as AG-7350 .
2. Set the Audio out switch to the normal
position.
3. Play back the above prerecorded tape and
confirm that the audio CH1 and CH2 meters show
on
the front panel OVu.
4. Connect the V.T.V.M. to the audio CH1 or CH2
ou~put on the rear panel.
5. Adjust VR4006 (CH 1) or VR4008 (CH2) so that
the output level is -SdBv +/- 0.3dBv.