Adjustment; Audio Section; Idling Current - Denon AVR-1909 Service Manual

ADJUSTMENT

Audio Section

Idling Current

Required measurement equipment: DC Voltmeter
1. Preparation
(1) Avoid direct blow from an air conditioner or an electric
fan, and adjust the unit at normal room temperature 15
°C ~ 30 °C (59 °F ~ 86 °F).
(2) Presetting
• POWER (Power source switch)
• SPEAKER (Speaker terminal)
(Do not connect speaker, dummy resistor, etc.)
2. Adjustment
(1) Remove top cover and set VR101 FL, FR, C, SL, SR,
on Main Amp. Unit, VR401, VR402 on 2ch- Amp. Unit
at fully counterclockwise (c) position.
(2) Connect DC Voltmeter to test points (FRONT-Lch:
TP101, FRONT-Rch: TP105, CENTER ch: TP103,
SURROUND-Lch: TP102, SURROUND-Rch: TP104,
SURROUND-BACK Lch: TP401, SURROUND-BACK
Rch: TP402).
(3) Connect power cord to AC Line, and turn power switch
"ON".
(4) Presetting.
MASTER VOLUME : "---" counterclockwise (c min.)
SPEAKER (Speaker terminal)
(Do not connect speaker, dummy resistor, etc.)
MODE
FUNCTION
(5) Within 2 minutes after the power on, turn VR101 clock-
wise (x) to adjust the TEST POINT voltage to
1.5 mV ± 0.5 mV DC.
(6) After 10 minutes from the preset above, turn VR101 to
set the voltage to
2.0 mV ± 0.5 mV DC.
(7) Adjust the Variable Resistors of other channels in the
same way.
DC Voltmeter
OFF
No load
: No load
: 7CH STEREO (5CH STEREO)
: CD
F Lch
VR101FL
TP101
VR401
S Back Lch
AVR-1909/789, AVC-1909
c
S Lch C ch S Rch F Rch
VR101SL VR101C VR101SR VR101FR
TP103
TP102 TP104 TP105
VR402
TP401 TP402
S Back Rch
21
c
x
MAIN AMP. UNIT
2CH AMP. UNIT