Marantz 5010 - Page 16

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10. Adjusting the Dolby Circuit
(1) Encoder circuit
. Set the 5010 in the recording mode of
operation.
. Set the DOLBY NR switch to the OFF
position.
. Connect a 5 kHz signal to the MIC input
jack,
. Adjust the input signal level until the
output voltage at J120 or J220 is 23.5
mV,
. In that state, measure the output level at
the REC QUT jack J122 or J222 provid-
ed for the DOLBY NR switch.
. Turn the DOLBY NR switch to the ON
position.
. Adjust the LAW CONT semi-fixed resis-
tor R315 until the output level at J122 or
J222 is 8+0.25dB higher than the one
obtained in Step 5 above.
(2) Decoder circuit
1. Set the 5010 in the playback mode of
operation.
2. Set the DOLBY NR switch to the OFF
Position.
3. Connect a 5 kHz signal to J117 or J217.
4, Adjust the input signal level until the
output voltage at J200 or J220 is 59 mV.
5. Turn the DOLBY NR switch to the ON
position.
6. Make certain that the output level at
J120 or J220 is 8+0.5 dB lower than the
one obtained in Step 4 above.
CAUTIONS
1, If the output level is not in the above-men-
tioned allowable range, repeat adjustment
beginning with the encoder circuit, not from
the circuit in any case.
2. The LAW CONT semi-fixed resistor R315
serves for both right and left channles. Adjust-
ment therefore may be made either for the
right or left channel.