Sony MHC-NX1 Service Manual - Page 58

DECK B, Deck A is RV311 L-CH and RV411 R-CH, Deck B is RV301

Get Sony MHC-NX1 PDF manuals and user guides View all Sony MHC-NX1 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 58 highlights

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. L-CH peak within 1dB Output level within 1dB Tape Speed Adjustment DECK B • Execute only if connected to the STR-NX1/NX3 Mode: Playback test tape WS-48B (3 kHz, 0 dB) AUDIO OUT jack frequency counter set STR-NX1/ + NX3 - Screw position R-CH peak L-CH R-CH peak peak Screw position 3. Mode: Playback test tape P-4-A100 (10 kHz, -10 dB) L-CH set AUDIO OUT (L) jack oscilloscope PFJ-1 or L-CH VH STR-NX1/ NX3 R-CH R-CH AUDIO OUT (R) jack waveform of oscilloscope in phase 45° 90° 135° 180° good wrong 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). 1. Insert the WS-48B into the deck B. 2. Press the G (DECK B) button. 3. Press the [HI-DUB] 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. 5. Press the [HI-DUB] 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) (WS-48B) Playback level Adjustment DECK A Procedure: Mode: Playback DECK B test tape P-4-L300 (315 Hz, 0 dB) set AUDIO OUT jack level meter PFJ-1 or STR-NX1/ NX3 + - 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 Open the cassette holder and unhock six claws of the sub panel (TC2) with tweezers or something, then remove the sub panel (TC2). forward reverse 15

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
15
Tape Speed Adjustment
DECK B
• Execute only if connected to the STR-NX1/NX3
Mode: Playback
1.
Insert the WS-48B into the deck B.
2.
Press the
G
(DECK B) button.
3.
Press the
[HI-DUB]
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.
5.
Press the
[HI-DUB]
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)
(WS-48B)
Playback level Adjustment
DECK A
DECK B
Procedure:
Mode: Playback
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
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.
3.
Mode: Playback
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).
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak
R-CH
peak
within
1dB
Screw
position
R-CH
peak
test tape
P-4-A100
(10 kHz, –10 dB)
oscilloscope
AUDIO OUT (R) jack
L-CH
R-CH
V
H
waveform of oscilloscope
in phase
45
°
90
°
135
°
180
°
good
wrong
AUDIO OUT (L) jack
L-CH
R-CH
PFJ-1
or
STR-NX1/
NX3
set
forward
reverse
Open the cassette holder
and unhock six claws of
the sub panel (TC2)
with tweezers or something,
then remove the sub panel (TC2).
+
–
AUDIO OUT jack
test tape
WS-48B
(3 kHz, 0 dB)
frequency counter
set
STR-NX1/
NX3
+
–
test tape
P-4-L300
(315 Hz, 0 dB)
level meter
AUDIO OUT jack
PFJ-1
or
STR-NX1/
NX3
set