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Nakamichi T-100 Service Manual page 53

Audio analyzer
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10.2.5.
Indicators
do not indicate the praper value when
Function Control is set to "Peak Lave!'
Conditions:
Input Signal
1 kHz
1 ¥ rms
for L and
R
channels
Input Level SU! — 0 dB
Meter Range SW —O dB
Function Control — Peak Level
{1} 640 mV rms is not obtained at Inputs (L) and (R} on
Absolute Rectifier P.C.B.
{a} Abnommality
of logic signals or defective pi-
lateral switch Q101 or 201 on Volume P,.C.B,
{b) Detective D107 of 201 on Volume P.C.B.
{2} —t.6 ¥ DCis not obtained at Outputs {L) and (R} on
Absolute Rectifiar P.C.B,
fa)
Abnormality
of
logic
signals
or
defective
bi-
lateral switch Q702,
703, 802 or 803
(b} Defective D705, 706, BO5 or 806
10.2.6.
Indicator
coes
not
indicate
the
proper
spead
value
when
Function
Cantrol
is set to "Speed
Waw/Flutter" or "Speed Unweighted" *
Conditions:
Input Signal
— 3 kHz +0.1% 30 mV rms or
more
Input Level SW — 0 dB
Speed Cal. Control
— Canter pasition
Function
Control
Speed
Wow/Fiutter
or
Speed Unweighted
(1} 3 kHz signal is not obtained at W/F Output on
Volume P.C.B, (or Input on Wow & Flutter P.C.B.)
fa) Abnarmality
af logic signals or defective bi-
lateral
switch
Q301
or
302
on
Volume
P-.C.B,
{2}
+1.6
V
DC
is
not
obtained
at
Speed
on
Wow
&
Flutter P.C.B.
ta)
Abnormality
of logic
signals
on
Wow
& Flutter
P.C.B. or Linear/Log.
Converter P.C.B.
10.2.7.
Indicator
does
not
indicate
the
proper
wow/
flutter
value
when
Function
Control
is set
to
"Speed
Wow/Flutter"
or
"Speed
Unweighted"
Conditions:
Input Signal
3
kHz
(modulated
with
4
Hr sine wave by 1%)
4Hz:
380 mV ems
3 kHz: 760 m¥ rms
tnput Level SW — 0 dB
Meter Range Sv — 0 dB
Function
Control
Speed
Wow/Flutter
or
Speed Unweighted
{1} 4 Hz 1 V peak-to-peak is not obtained at Output on
Wow
&
Flutter
P.C.B.
for
Input
{R}
on
Absolute
Rectifier P.C.B.}
fa} Defective IC204
$2
(b) Abnormality
of logic signals or defective bi-
lateral switch Q306 or 307 on Wow & Flutter
P.C.B,
(c} Abnormality of logic signals on Distortion P.C.B.
or (HF-AWTD Network P.C.B.
(2) —1.5 ¥ DC is not obtained at Output {L} on Absalute-
Rectifier P.C.B.
(a) Defective 10003
(b} Abnormality
of logic signals or defective bi-
lateral switch Q804 or 805
(3)
—*.5
V DC
is not obtained
at Output
(L} on Analag
Multiplier P.C.B.
{a)
Abnormality
of logic signals
10.2.8,
Oscillator
Outputs
do not show
the proper value
when
Function Control is sat to "Level" and
Oscillator
Control
is set to
"20
Hz
—- 20 kHz"
Conditions:
Oscillator Control — 20 Hz — 20 kHz
Osciltator Output Control — Max.
Function
Control —
Level
{1} 1.2 ¥ rms is not obtained at OSC Output on Oseil-
lator P.C.B.
fa) Poor contact or disconnection of wire of GN-11
on Switch
P.C.B.
Abnormality
of
logic
signals
or
defective
bi-
lateral switch Q362 or 304
Defective
1C304, 0301, 303, 305 or 306
{b)
te)
{2}
1.2¥
rms is not
obtained
at
pin
4 of
CN-19
on
Volume P.C.B.
{ab Poor contact or disconnection of wire of CN-19
(3)
1.2
V
nms
is not
obtained
at
pin
1 of
CN-16
on
Volume P.C.B.
{ab Dafective ¥R301
{b} Defective 0303 or 304
{4} 1,2 ¥ rms fs not obtained at Oscifator Output Jacks
{a]
Poor contact or disconnection
of wire of CN-16
10.2.9,
Oscillator
Outputs
do
not
show
the
proper
value when Function Controf is set to "Level"
and Oscillator Contrel is set to "Pink Noise"
Conditions:
Oseillator Control — Pink Noise
Osciliator Output Control — Max.
Funetion Control — Level
{i} Noise of 50 m¥ mms js not obtained at Pink Output
on Oscillator P.C.B.
{a} Poor eontact or disconnection of wire of CN-11
on Switch P.C.B.
(b} Abnormality
of logic signats or defective bi-
lateral switch Q307
{c}
Defective
16202, 303, 0308 or 309

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