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Yamaha 505 Service Manual Page 24

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GX-505/GX-505VCD
GX-505/VCD
< Recording section >
Rating
Adjust for equal record and
playback levels.
(– 27 dBV ± 0.3 dBV)
Adjust for equal record and
playback levels.
(– 27 dBV ± 0.3 dBV)
Adjust for equal record and
playback levels. (Fig. D)
Perform record bias adjust-
ment of High (CrO2) tape
again, if the rating was not
satisfied.
Confirm recorded level rat-
ing as in step 1 When re-
corded level rating is im-
proper, go back to step 1
and also carry out adjust-
ments in step 2 again.
Item to be
Adjusted
Recording
level
Recording
bias
(Total
frequency
response)
Confirmation
of recorded
level
Step
1
2
3
Points of
measurement
REC OUT
REC OUT
REC OUT
Mode
REC
PLAY
REC
PLAY
REC
PLAY
Instrument
required
ACVM
Audio
frequency
oscillator
ACVM
Audio
frequency
oscillator
ACVM
Audio
frequency
oscillator
Measurement
conditions
Input 1 kHz Signal to
AUX IN from Audio
Frequency Oscillator.
Adjust output level of
Audio Frequency Os-
cillator so that the
voltage of REC OUT
becomes – 27 dBV.
Input 12.5 kHz Sig-
nal to AUX IN from
Audio Frequency Os-
cillator.
Adjust output level of
Audio Frequency Os-
cillator so that the
voltage of REC OUT
becomes – 27 dBV.
Tape
AC-514
High
(CrO2)
AC-514
High
(CrO2)
AC-225
Normal
(LH)
AC-514
High
(CrO2)
Adjustment
parts
VR6 (L ch)
VR5 (R ch)
VR3 (L ch)
VR2 (R ch)
● TOTAL FREQUENCY RESPONSE ( – 27 dBV)
Dolby NR B & OFF
Type I (Normal)/Type II (High)
Fig. D
23
± 5dB
± 5dB
1k
± 3dB
± 4dB
3k 10kHz31525050 12.5kHz
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