Yamaha VL70-m User Manual

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107
2. Add all the converted numbers.
3. Divide the total by 128 and note the remain-
der.
4. Subtract the remainder from 128. The result
is the checksum.
5. Convert the decimal checksum back to
hexadecimal format using the above chart.
Troubleshooting
The VL70-m is a very versatile tone generator
with many features and functions that affect
operation. In many cases, what appears to be a
fault with the VL70-m can actually be traced to an
improperly set parameter or something as simple as
a bad connection.
Here’s how to determine if the problem is internal
(e.g. parameter settings) or external (e.g. connec-
tions, amplifier, etc.):
● Listen via headphones. Plug a pair of head-
phones into the VL70-m and play. If the
headphone sound is OK, then the problem is
most likely in the amplifier or mixer you are
using, or the audio connection cables.
● Try adjusting all operational controllers —
modulation wheels, foot controllers, etc. In
some cases extreme controller settings can
cause unexpected sound or pitch … or even no
sound at all.
● Try selecting different voices. If the problem
occurs only on one voice then the voice param-
eters are most likely at fault. If the problem
occurs on all voices then a utility parameter
should be suspected.
The following are some common problems and
probable causes:
Symptom
No power.
Possible Causes
Is the AC adaptor properly connected to both
the VL70-m and an AC wall outlet (page 15)?
If the AC apaptor is connected to a switched
AC outlet on another piece of equipment (an
amplifier, for example) is that devide switched
on?
HEX DEC
40
64
41
65
42
66
43
67
44
68
45
69
46
70
47
71
48
72
49
73
4A
74
4B
75
4C
76
4D
77
4E
78
4F
79
HEX DEC
50
80
51
81
52
82
53
83
54
84
55
85
56
86
57
87
58
88
59
89
5A
90
5B
91
5C
92
5D
93
5E
94
5F
95
HEX DEC
60
96
61
97
62
98
63
99
64
100
65
101
66
102
67
103
68
104
69
105
6A
106
6B
107
6C
108
6D
109
6E
110
6F
111
HEX DEC
70
112
71
113
72
114
73
115
74
116
75
117
76
118
77
119
78
120
79
121
7A
122
7B
123
7C
124
7D
125
7E
126
7F
127
Appendix