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PC-Y777 B/E/G
H Mechanism
and Amplifier Sections
Item
Measuring Conditions and Main Adjustments
Standard Value
Adjusting Point
Head azimuth
adjustment
(Both A and B
mechanisms)
{Conditions]
1. Mode : PLAY
2. Test tape : VTT7O3L
(10 kHz)
3. Measuring point : Headphone OUT
{Adjustment]
1. Connect an electronic voltmeter to the headphone jack.
2. Play back the test tape VTT7O3L.
3. Adjust the head azimuth with screw @® until the reading of
the electronic voltmeter becomes within — 1 dB from the peak
and then adjust the phase difference to zero.
4. Adjust to peak between FWD/REV
within
— 4 dB from the
Within
— 1 dB
from the peak
confirmation
Playback level
peak.
Tape speed
[Conditions]
and
1. Mode
: PLAY, Normal speed
wow-flutter
2. Test tape : VTT712
at tape end
3. Measuring point : Headphone
OUT
[Adjustment & Confirmation]
1. Connect a wow-flutter meter to headphone out.
2. Play back the test tape VTT712 at tape end to B mechanism.
Adjust
by VR701
to
become
3,000 Hz
3. B mechanism:
+10 Hz
A mechanism:
+50 Hz +100 Hz.
4. Check to see if reading of the meter is less than 0.22% (JIS
RMS).
[Conditions]
1. Test tape: VTT724
2. Mode: PLAY, Normal speed
3. Measuring point: DOLBY
NR OUT TP.
[Adjustment]
1. Connect a E-voltmeter to DOLBY
NR out TP.
2. Adjust VR101, VR201
(Deck A) or VR102, VR202 (Deck B)
while playing VTT724 so that TP output becomes
— 11 dBs
Against B mechanism, tape speed is within
Normal speed:
High speed:
Wow-flutter:
(JIS RMS)
— 11 dBs+1 dB
2,910~ 3,100 Hz
5,100~ 5,700 Hz
less than 0.22%
AL VR101
R VR201
BL VR102
R VR202
mechanisms)
1. Mode
: Normal
A/B mechanism : Play back the test tape VTT 739 difference
level against 1 kHz.
1 kHz/125 Hz
: within
—7 +4 dB
1 kHz/10 kHz : within O +3 dB
2. Mode
: Metal/CrO2
Play back VTT739
and to check the difference
between
Normal position and Metal/CrOz position at DOLBY OUT TP.
10 kHz : within
~4 dB +2 cB.
+1 dB.
Playback
[Conditions]
frequency
1. Test tape : VTT739
response
2. Mode : PLAY, Normal speed
confirmation
| 3. Measureing point : DOLBY
OUT TP
A/B mechanism,
(Both A and B | [Confirmation]
Normal
1 kHz/125 Hz:
within
~7+4 dB
1 kHz/10 kHz
within
0 +3 dB
B mechanism,
Metal/against
Normal position
within
—4dB
+2 dB
16 (No. 1802)
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