Teac BX-300 - Idling Current Adjustment; Power Output Meter Adjustment (BX-500 only); Voltage Conversion (General Export Model Only)

3-3. IDLING CURRENT ADJUSTMENT
Connect the DC voltmeter between T.P-1 and T.P-2.
. Adjust R139 (BX-500) or R130 (BX-300) so that the DC voltmeter indicates approx. 100 mV.
. After R139 (BX-500) or R130 (BX-300) adjusted, wait/30 seconds for idling.
. Connect the DC voltmeter between T.P-3 and T.P-4.
Repeat procedures 1 to 4 above and adjust R239 (BX-500) or R230 (BX-300).
1.
2
3
4. Readjust R139 (BX-500) or R130 (BX-300) so that the DC voltmeter indicates 26 mV +15 mV.
5
6.
N
| BX-500/BX-300
OTE: When using an oscilloscope, instead of the DC voltmeter, carefully connect the oscilloscope so that the oscilloscope GND terminal is
not connected to the GND of the amplifier, thereby causing a short. Use the oscilloscope in the floating state.
DC VOLTMETER
100 mv
26 mV
i
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|
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3-4 POWER OUTPUT METER ADJUSTMENT (BX-500 only)
1. Connect the AC voltmeter to the SPEAKERS A terminal.
. Set the VOLUME control to MAX.
oO PF Wh
NOTE: BX-500 should be placed in the normal operating position.
3-5 VOLTAGE CONVERSION
(GENERAL EXPORT MODEL ONLY)
BE SURE TO REMOVE THE POWER CORD FROM THE AC
OUTLET BEFORE REMOVING THE OUTER CASE AND RE-
POSITIONING THE VOLTAGE CONVERSION PLUG.
1. Remove the top and side metal cover by removing screws in each
side of the metal cover.
2. Locate the woltage selector plug on the left side of the BX-500,
BX-300.
3. Remove the plug by pulling it out and re-install it so that the
arrow on the plug exactly lines up with the white line that in-
dicates the appropriate voltage.
4. Replace the top cover.
R139(R130)
. Set the SPEAKERS selector to A and SOURCE selector to AUX.
-
Apply
a
1
kHz
input
signal
to
provide
an
output
power
of
50
W
(approx.
20
Vrms)
to
AUX
terminals
(AUX
input
approx.
150
mV).
.
Adjust
R713
and
R813
so
that
the
Power
Output
Meters
indicate
50
W.
117V
lOOV
TA- 065