Sony MHC-NX3AV Operating Instructions (primary manual) Panduan Servis - Halaman 5
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2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
within
L-CH
1dB
peak
Output
level
R-CH
peak
Screw
position
3. Mode: Playback
test tape
P-4-A100
(10 kHz, –10 dB)
L-CH
set
STR-NX1/
R-CH
waveform of oscilloscope
in phase 45 °
good
4. Repeat step 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Playback Head (Deck A).
Record/Playback/Earth Head (Deck B).
forward
reverse
within
1dB
Screw
position
L-CH
R-CH
peak
peak
AUDIO OUT (L) jack
oscilloscope
L-CH
PFJ-1
V
H
or
NX3
R-CH
AUDIO OUT (R) jack
90 ° 135 ° 180 °
wrong
Open the cassette holder
and unhock six claws of
the sub panel (TC2)
with tweezers or something,
then remove the sub panel (TC2).
Tape Speed Adjustment
• Execute only if connected to the STR-NX1/NX3
Mode: Playback
test tape
WS-48B
(3 kHz, 0 dB)
set
1. Insert the WS-48B into the deck B.
2. Press the
(DECK B) button.
G
[HI-DUB]
3. Press the
button in playback mode.
Then at HIGH speed mode.
4. Adjust RV1001 on the LEAF SW board do that frequency
counter reads 6,000 ± 180 Hz.
[HI-DUB]
5. Press the
button.
Then back to NORMAL speed mode.
6. Adjust RV1002 on the LEAF SW board so that frequency
counter reads 3,000 ± 90 Hz.
Adjustment Location: LEAF SW board
Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)
Playback level Adjustment
Procedure:
Mode: Playback
test tape
P-4-L300
(315 Hz, 0 dB)
set
Deck A is RV311 (L-CH) and RV411 (R-CH), Deck B is RV301
(L-CH) and RV401 (R-CH) so that adjustment within specified
value as follows.
Specified Value:
AUDIO OUT jack PB level: 301.5 to 338.3 mV (–8.2 to –7.2
dB) level
difference between the channels: within ± 0.5 dB
Adjustment Location: AUDIO board
DECK B
AUDIO OUT jack
frequency counter
STR-NX1/
+
NX3
–
(WS-48B)
DECK A
DECK B
AUDIO OUT jack
level meter
PFJ-1
or
+
STR-NX1/
–
NX3
15