Pioneer SPEC-2 Service Manual - Page 14
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6 . 2 C U R R E N T L I M I T E R S E N S I T I V I T Y
ADJUSTMENT
Note:
The high output power of the SPEC-2 requires a
dummy load of 4O and more than 200W. If a
200W dummy load is not available, connect two
8S}, 100W loads in parallel.
Connect as shown in Fig. 14.
Set SPEC-2 impedance selector switch to 8O
(even though a 4O dummy load is used).
While the voltmeter indicated 30V/(40 ), adjust
VR2 to just distorted point the upper half of
the waveform.
In the same manner, adjust VR3 to just dis-
torted point the lower half with 28.3V/(44).
Waveform
1 )
2 )
3 )
V R 3
Voltmeter
Osilloscope
ooo
AF signal generator
F i g . 1 3 T h e P o s i t i o n o f V R 2 a n d V R 3
/ | ilPur
la
Fig. 14 Connection Diagram for Current Limiter Sensitivity Adjustment