Denon PMA-1080R - Service Information; Block and Level Diagram; Adjustment Procedures

BLOCK AND LEVEL DIAGRAM
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O——O SPEAKER-B
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TAPE-IO TAPE-20
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SELECTOR
REC OUT
TAPE-10
TAPE-2 O
REC
PMA-1080R aml
METHOD OF ADJUSTMENTS
105W/Bohm (29.0V 29.2dB)
CD etc...
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Oscilator
DC Voltmeter
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a K IDLING CURRENT
3 & e Setup
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a
1.
Lay
the
unit
at
an
ordinary
position
away
from
a
direct
current
from
a
cooler
or
fan.
Do
the
adjustment
at
a
temperature
z me between 15°C (59°F) and 30°C (86°F).
a 25 2. Set controls as follows.
POWER SWITCH = —- OFF (ML)
VOLUME CONTROL = fully counterclockwise. ( i. ) min. [Main volume (VR801) and semifixed resistors ]
(VR501,502,503 and 504)
SPEAKER Terminals — open: do not connect the speakers, dummy load etc.
e@ Adjustment
Remove Top cover. And then connect DC Voltmeter to Test points of Main Unit 1U-2460A-1.
Connect Power cord to AC outlet, and turn POWER Switch "ON" (.=) . Within 10 seconds turn VR501 (Lch) and
VR502 (Reh) clockwise so that the DC voltmeter reads 8 + 0.5 mV.
. Then after 2 minutes warmup adjust VR501 and VR502 so that the DC Voltmeter reads 8 + 0.5mV.
. And after 10 minutes warmup adjust VR501 and VR502 so that the DC Voltmeter reads 8 + 0.5 mV.
. Apply a 1 kHz, 10 mVrms signal to both channels input and set the main volume at maximum position.
. Confirm that the indication of DC voltmeter becomes slightly greater value (approx. 10 mV or less),then adjust the
VR503 (L ch), VR504 (R ch) clocdwise to obtain 30 mV +3 mV on the meter.
. After 2 minutes, readjust the VR503, VR504 for 30 mV + 3mvV.
. And after 10 minutes warmup, adjust VR503, VR504 for 30mV + 3mvV.