Troubleshooting; Accessories - Revox B251 Operating Instructions Manual

5
TECHNICAL APPENDIX
5.1
Troubleshooting
Before
concluding that the amplrfier
is
defective, ensure
that
all
connections and operating procedures conform to the instruc-
tions
of
this
manual.
Possible
trouble
sources:
-
Check cabling
-
ls the
SEPARATED
switch
(rear panel) pressed or
released?
-
ls
the speaker selector in
the correct
position?
-
Has
the
correct
source been selected?
-
Gain
too low:
is the -20dB
button
pressed?
-
Sound distorted:
is
the -20 dB
button
pressed and the amplifi-
er
set
for very high output volume?
-
No output
f
rom PHONO input:
is
the PHONO
switch
[10]
in M
C
position or the corresponding capacitance?
-
lf
the amplif ier
can no longer be
operated, disconnect amplifi-
er
from AC supply and reconnect
it
to
force reinitialization of
microprocessor.
5.3
Technical data
5.2
Accessories
Remote control
8201,
part No.
31201
8251
IR-TAPE
REMOTE KlT,
part No. 78666
MC input retrofit kit. part No. 78670
MM input retrofit
kit part No.
78668
REMOTE POWER ON CABLE,
part No.
33209
Cinch
cable
1
meter C2C
210,
part No.
33401
Cinch cable 2 meters C2C 220, part No. 33042
Brackets
for
19"
rack mounting, part No.
34100
Music Power:
2 x
150W
nto
B
0hms
2
x
300W into 4
Ohms
Subsonicfilter:
18llz,18dB/0ctave(assignabletoeachprogramsource)
terminat
on):
96dB
re ative
to nom
na poweroutputB0dB at50mW
(Phono
M
M
input, referred
to
5 mV, 1
kOhm
te rm
i
nation):
75 dB re ative to nom
na power output
75 dB at 50 mW
eqrivaient noise vo tage at
the input
-124 dgV
Sinus:
Gontinuoussinewavepower:
2x 100W into 4
Ohms,
both channe s dr
ven
Damping
lactor:
100 at
1
kHzl8
Ohms
2 x
100W into
B
0hms
2
x 150W into 4 0hms
lnputs
SensitiYity,/l mpedance:
TUNER
AUX:
C.D SC;
TAPE
1:
T
Dtr
',
EXT.
FILTER
PHONO MC
PHONO
N4
[4
160
mV . 2.3V,
nominal
y 500 mV/47
kOhms
160 mV
.
2.3
V,
nomrnally
500 mV.z47
kOhms
160 mV
..
2.3 V,
nom
na ly 500
mV/47 kOhms
160
mV...2.3
V,
nominally 500 mV/47 kOhms
160
mV...2
3 V,
nominal y 500
mV,z47
kOhms
nominal y 700 mV/47
kOhms
100
pV
1.2 mV,
nominally
300 pV.z100
0hms
1.6
mV...23
mV,
nom
na ly 5 mV.z47
kOhms/
68
pF...400
pF
Grosstalk between
inputs: (at
10 kHz)
90 dB
Ghannel
separation: (at
1
kHz)
75 dB
Frequency response:
?AH2'.20kHz
+0/-02
dB
Phono RIAA
equalization:
+0
3
dB
(4 t
me constants)
Total harmonic
distortion:
(at
10 kHz)
0.01 %
at nominal power
output
0.01 %
at 50
mW
Rise
time:
2
ps
w
th
4
Ohms
oad
General
Outputs
Level,/permissible load:
TAPE
i:
TAPE
2:
TAPt
COPY
Operating Gonditions:
100 mV
...1.7 V,
nominally
500
mV/)10
kOhms
100 mV
...1.7
V,
nominaliy 500
mV/)10 k0hms
nominal y 500 mV/)10 kOhms
Amb ent
temperature 5...40 centigrade relat
ve
humidity
c
ass
F
Power consumption: max.650W
Remote power-onl
'o'n
B7l0
Cassette
Peco.de'v
a 6-po p
'orrectot
nor volalie.
maro
y
ra
r-a
ned
wrll^ou pou"
EXT.
F
LTIR
nominal
y 700 mV/)10
kOhms
HEADPHONES
(2
x):15V max. (at
100W/4
Ohms),
adjustable in
4
steps,
t4,
0,
-4, -8
Memory
contents:
Options: PH0NO MC-1nput
TAPF TRANSPORT REIV]OTE
81]
/B]14
Tone
control:
Bass:
Treb
e
30Hz/I12
dB
...
-I2 dB
15kHz/'|7
dB
-7 dB
Weight:
8.5 kg
(18
bs i2
oz)
Dimensions:
WxHxT(mm)
450x153x332
Sublect to
change
14