Teac X-1000 - Page 17

ITEM
INPUT INSTRUCTION
ADJUST
(or CHECK)
. Preparation 1
Prepare test setup as shown on Fig. 3-13. -.
MEASURING POINT:
RESULT
X:1000M/X-1000
REMARKS
~
Preset
each
of
the
trimmers
of
the
decoder
section
on
the
PCB
to
their
approximate
center
positions.
. Input setting
. RMS symmetry
Apply 100Hz level to get RESULT | Attenuator
value.
P602-1(4):°
300mV (—8.2dB)
R665/R666
TP1(TP2): :
Clean 200Hz sine-wave
Refer to Figs. 3-9 and
3-10.
.
RMS
time
|
5
Check
TP1(TP2):
constant
:
;
:
385uV
(—66.1dB)
+20%
..Decoder
nominal
6
Apply
1kHz
level
to
get
RESULT.
Attenuator
P602-1(4):
level
value...
300mV
(—8.2dB)
7
:
ae
R637/R638:
|
P603-1(4):
mt
ke
ve
oe
300mV
(—
a
dae)"3
Reference
1
—
. VCA symmetry 8
. Frequency
response
(X-1000M)
Change test setup to as Fig, 3-14
then. adjust.
Return to Fig. 3-13 test setup.
Change oscillator frequency to
100Hz.
10kHz.
Change oscillator frequency to
100Hz.
Change oscillator frequency to
R657/R658
. Frequency 11
response
(X-1000)
12
Change oscillator frequency to
10kHz.
P603-1(4):
face’.
(Level variation: 5mV or
less)
P603-1 (4):
+5dB +1dB against
Ref, 1.
(476mV ~ 599mV)
P603-1(4):
+9.4dB +1dB against
Ref. 1.
(789mV ~.994mvV)
P603-1(4):
—0.3dB +1dB against
Ref. 1.
(258mV ~ 325mV)
P603-1(4):
+3,2dB +1dB against
Ref, 1.
(387mV ~ 487mV)
A-relatively straight hori-..
zontal line on the ‘ scope:
——
. Decoder effect-1 13
Apply 1kHz level”2 to get
RESULT vatue.
Attenuator
P602-1(4):
300mV (—8. 2dB)
Apply 1kHz at —30dB against
Ref. 2.
Check
P603-1(4):
—60dB +1dB against
Ref. 1..:
{267uV. ~ 337pV).
+
. Decoder effect-2 15
Apply 1kHz at +10dB against
Ref. 2.
P603-1(4): :
+20dB #10B, against
Ref..1.
(2.67V ~ 3: 37V)
Distortion: 0.2% or less
Reference 2..:
17