Teac X-1000 - 3-5-2 Decoder Adjustment

X-1000M/X-1000 |
ADJUST | MEASURING POINT:
ITEM INPUT INSTRUCTION (or CHECK) RESULT
REMARKS
7. Frequency Return to Fig.3-11test setup. P703-1(5):
response Change oscillator frequency to —2.5dB +0.5dB against
(X-1000M) 100Hz. : Ref, 1.
; (212mV ~ 238mV)
Change oscillator frequency to P703-1(5):
10kHz. —4.7dB +0.5dB against
Ref. 1.
(165mV ~ 185mvV)
8. Frequency Change oscillator frequency to P703-1(5):
response 100Hz, +0.5dB +0.5dB against
(X-1000) Ref. 1.
(300mV ~ 337mV)
Change oscillator frequency to P703-1(5):
10kHz. —3.2dB +0.5dB against
Ref. 1.
(196mV ~ 220mV)
9.
Encoder
effect-1
Apply
1kHz
level”
2
to
get
Attenuator
P702-1(5):
*2
RESULT value. 300mvV (—8.2dB)
Apply 1kHz at —60dB against P703-1(5):
Ref. 2. —30dB +0.5dB against
Ref, 1.
(8.96mV ~ 10.1mV)
10. Encoder effect-2 Apply 1kHz at +20dB against P703-1(5):
Ref. 2. +10dB +0.5dB against
Ref. 1.
(0.896V ~ 1.01V)
Distortion: 0.3% or less
3-5-2 DECODER ADJUSTMENT sel ani aaa Sirs
correspond to L-ch and R-ch.
AC VOLTMETER
Low distortion DBX PCB
AF OSCILLATOR P602-1(4)
ATTENUATOR peas
: 5} pgot-1(ayTP-1(TP.2)
PT. @® @® J 4
GND GND ¢
Distortion factor: 0.02% or less
Max. output level: 3V or more j
Fig. 3-13 Decoder adjustment setup
This terminal is not the same
as the decoder and encoder
terminal (See Fig. 3-12).
U501-6 is not used.
Level variation:
5mV or less OSCILLOSCOPE
DBX PCB
y P501-1
¥ U501-8
9 U501-2
P603-1
TP.1(TP.2) (4) ¢
SCOPE DEFLECTION
WAVEFORM
Do not ground these
GND terminals,
4+180mV
1
—180mV
SYMMETRY ADJUSTMENT WAVEFORM
VCA SYMMETRY ADJUSTMENT
WAVEFORM GENERATOR
Fig. 3-14 VCA symmetry adjustment setup (decoder)
16
Reference 2
as