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For U.S.A., Canada, Europe,
Asia, China, Taiwan R.O.C.
& Korea model
Ver. 2
SERVICE MANUAL
MODEL AVR-1404/484
AV SURROUND RECEIVER
For purposes of improvement, specifications and
design are subject to change without notice.
Please use this service manual with referring to the
operating instructions without fail.
Some illustrations using in this service manual are
slightly different from the actual set.
16-11, YUSHIMA 3-CHOME, BUNKYO-KU, TOKYO 113-0034 JAPAN
X0172V.02 DE/CDM 0309
AVR-1404/484 2
SAFETY PRECAUTIONS
The following check should be performed for the continued protection of the customer and service technician.
LEAKAGE CURRENT CHECK
Before returning the unit to the customer, make sure you make either (1) a leakage current check or (2) a line to chassis
resistance check. If the leakage current exceeds 0.5 milliamps, or if the resistance from chassis to either side of the
power cord is less than 460 kohms, the unit is defective.
500V
1M
(1)
(2)
(1)
(2)
2
AVR-1404/484 3
DISASSEMBLY
(Follow the procedure below in reverse order when reassembling.)
1. Top Cover
(1) Remove 6 screws and 3 screws , detach the Top cover in the arrow direction.
Top Cover
1
2
1
2. Front Panel
(1) Remove 4 screws and 2 screws .
(2) Detach the Front Panel in the arrow direction.
4
Front Panel
3
3. Rear Panel
(1) Remove cord bushing from the Rear Panel.
(2) Remove 30 screws .
(3) Detach the Rear Panel in the arrow direction.
5
Rear Panel
6
6
3
AVR-1404/484 4
LEVEL DIAGRAMS (1/2)
INPUT
A/D IN A/D IN D/A OUT SW SUM ELECTRIC
BUFFER REV AMP TONE PRE AMP POWER AMP
REV AMP REV AMP LPF REV AMP VOLUME
AMP
HPF
DIGITAL
DIR
SPK OUT
CD IN A/D DSP D/A
FRONT
ATT H/P OUT
M62446
MUTE SUM S/W MUTE
6CH IN
40dB
FRONT
30dB
SPK OUT
20dB A/D D/A FRONT
2.83V
0dBFS 0dBFS (1W/8ohm)
10dB
25.5dB
-10dBFS -10dBFS
6CH IN
0dB -35.5dB
6CH IN (200mV) CD IN -12dB
-20dBFS 6dB
-20dBFS D/A OUT -18dB 15.5dB
-10dB 100mV REF H/P OUT
47mV
(0.27W 8ohm)
-30dBFS -30dBFS
VOL 00
-20dB
6CH IN
SPK OUT
DSP OUT D/A CENTER
40dB SURROUND
CENTER
30dB
SURROUND MUTE
M62446
MUTE
20dB D/A SPK OUT
2.83V
(1W/8ohm)
0dBFS
10dB
-10dBFS 25.5dB
6CH IN 0dB
(200mV)
-20dBFS 6dB
D/A OUT
-18dB 15.5dB
-10dB 100mV REF
-30dBFS
VOL 00
-20dB
4
AVR-1404/484 5
LEVEL DIAGRAMS (2/2)
D/A OUT SW SUM ELECTRIC
REV AMP PRE AMP
LPF REV AMP VOLUME
SUB_WOOFER
M62446
6CH INPUT
SUB WOOFER
DSP OUT D/A
PRE OUT
MUTE MUTE
30dB
D/A
20dB
0dBFS
10dB Front D/A Out TO FRONT CH
200mV ref
-10dBFS
SUB WOOFER
(200mV) 0dB 10.5dB PRE OUT
150mV
6CH IN (112mV) -5dB -20dBFS
-10dB Config2 -25dBFS 6dB
LFE 5dB 25.5(15.5+5+5)dB
-18dB
-30dBFS
-20dB Config1 -35dBFS 6dB
LFE
VOL 00
-30dB
5
AVR-1404/484 6
BLOCK DIAGRAM
6
AVR-1404/484 7
ADJUSTMENT
Tuner Section
CONNECTION DIAGRAM OF MEASURING INSTRUMENTS
FM
T402 T403
R471 STEREO
MODULATOR
IC402
75ohm FM SSG
VR402
Digital
Voltmeter
TUNER B'D
FM ALIGNMENT
Tuning Input Output Adjustment
Alignment
Step Frequency Input
Item Type Frequency Modulation Coupling Type Connect to Points Adjust to
Setting Level
Center 98.1MHz Mono Antenna Digital
1 FM SSG 98.1MHz 60dB R471 T402 50mV
Adjustment (98.0MHz) 1kHz 100% Terminal Voltmeter
98.1MHz Mono Antenna Distortion Output Minimum
2 Distortion FM SSG 98.1MHz 60dB T403
(98.0MHz) 1kHz 100% Terminal Meter Terminal (L) Distortion
3 Repeat Steps 1 and 2
98.1MHz Antenna Light "TUNED" on
4 Signal Level
(98.0MHz)
FM SSG 98.1MHz 20dB OFF
Terminal FL Display
VR402 20 +14 dB
-10
AM
T402 T403
R471
IC402
VR401
TUNER B'D
AM ALIGNMENT
Alignment Output Adjustment
Step Frequency Input Remarks
Item Type Connect to Points Adjust to
999 (1000) Light "TUNED" on SSG OUTPUT
1 Signal Level AM SSG VR401
kHz FL Display 74dB (EMF)
7
AVR-1404/484 8
Audio Section
Idling Current
Required measurement equipment : DC Voltmeter
Preparation
(1) Avoid direct blow from an air conditioner or an electric fan, and adjust the unit at normal room tempereture
15