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5.8
Adjustments, English
Module 10, Output Amplifi er
Adjustment of bass/treble speaker level
When replacing module 10, potentiometer 10R402-405 or amplifi er 10IC15-16,
read out the adjustment position on the old potentiometers and set the new
potentiometers to the same position. See
Replacing speaker units:
The new speaker unit will have a rated value stamped on its back, and this value
has to be used when making this adjustment. The outputs shall be adjusted to the
nominal value (0.00 dB) according to the table.
- Connect an audio oscillator to the V.TAPE socket 14P21.
14P21 pin 2
Audio right in
14P21 pin 4
Audio ground
14P21 pin 6
Audio left in
- Press VTAPE and toggle on LIST until the display reads SPEAKER, and then press 1
(Sound mode 1 - internal TV speakers).
- The TV sound controls, Bass, Treble and Balance, must be unregulated (0), and the
loudness must be Off. Press: MENU 4 (or 3) 2 1 and adjust by pressing
m
.
- Connect an AF voltmeter to 10P57 pin 1 (right in) or pin 4 (left in) with ground to
pin 2.
- If the level in the treble has to be adjusted, set the signal from the audio oscillator
to 10kHz, and adjust the level at the input to 250mV by means of the audio
oscillator output and volume
- If the level in the bass has to be adjusted, set the signal from the audio oscillator
to 1kHz, and adjust the level at the input to 250mV by means of the audio
oscillator output and volume
- Connect an AF voltmeter across the output of the unit in question (the speaker
units need not to be connected during the adjustment procedure):
Bass:
10P77 pin 1
10P77 pin 3
10P78 pin 1
10P78 pin 3
Treble:
10P77 pin 2
10P77 pin 3
10P78 pin 2
10P78 pin 3
- Adjust until the voltage at the speaker output corresponds to the voltage found in
the speaker level table by means of the rated value stamped on the back of the
speaker unit.
4.
r
u
or
on Beo4.
r
u
or
on Beo4.
Bass right out
10R402 See
Bass right ground
Bass left out
10R404
Bass left ground
Treble right out
10R403
Treble right ground
Treble left out
10R405
Treble left ground
n
l
p
,
,
or
4
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