Crystal Detector - Pioneer SX-3800 Service Manual

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Crystal Detector
1. Set the FIvl SG output frequency to 98MHz
output level to 60dB (unmodulated), and tune
the SX-3800 to this frequency.
2. Adjust the B core of T201 so that the voltage
between no.10 terminal of the tuner assembly
and ground is reduced to DC 0V (t300mV).
3. Set the FM SG output level to 60dB, modula-
tion frequency 400H2, frequency deviation
7 SkHz (100V. m odulation ).
4. Adjust the A core of T201 to obtain maximum
AC voltage reading between no.L0 terminal
of the tuner assembly and ground.
C o n n e c t S I G N A L m e t e r o r D C v o l t m e t e r
T o R E C t e r m i n a l
sx-3aoo
Oscilloscope
M P X s i g n a l g e n e r a t o r
I N ( E X T . M O D }
F i s . 8 . 2
To FM 300n ANT
terminals
AC voltmeter
Distortion meter
F M s i g n a l g e n e r a t o r