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TX-L55/LR552
SERVICE MANUAL
SERVICE MANUAL
AV Receiver
Titanium and Silver models
MODEL
TX-L55
230-240V AC, 50Hz
220-230V AC, 50Hz
SMPP,SMPA
SMGQ,SMGR,SMGT
Ref. No. 3822
082004
MODEL
TX-LR552
120V AC, 60Hz
120V AC, 60Hz
TMDD
SMDD
Silver models
TX-L55
SAFETY-RELATED COMPONENT
WARNING!!
COMPONENTS IDENTIFIED BY MARK
ON THE
SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE
CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
REPLACE THESE COMPONENTS WITH ONKYO
PARTS WHOSE PART NUMBERS APPEAR AS SHOWN
IN THIS MANUAL.
MAKE LEAKAGE-CURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE
SUPPLY CIRCUIT BEFORE RETURNING THE
APPLIANCE TO THE CUSTOMER.


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TX-LR552
SPECIFICATIONS
Amplifier Section
Video Section
Tuner Section
FM
AM
General
Video Inputs
Video Outputs
Audio Inputs
Audio Outputs
Specifications and features are subject to change without
notice.
Power output:
Front L/R 65 W + 65 W
Center 65 W
Surround L/R 65 W + 65 W
Surround back L/R 65 W
(6
, 1 kHz, FTC)
Dynamic power:
40 W + 40 W (8
, front)
THD (total harmonic
distortion):
FTC 5.0% (rated power)
Damping factor:
75 (front, 1 kHz, 8 )
Input sensitivity and
impedance:
200 mV/47 k
(AUX)
Output level and
impedance:
200 mV/470
(REC OUT)
Frequency response:
10 Hz~60 kHz/+1.5 dB, +/-3 dB (AUX)
Tone control:
±12 dB, 100 Hz (BASS)
±12 dB, 20,000 Hz (TREBLE)
S/N ratio (Direct mode): 100 dB (AUX, IHF-A)
Speaker impedance:
6
~ 16
Input sensitivity, output
level and impedance: 1.0 Vp-p/75
(component and S-Video Y)
0.7 Vp-p/75
(component PB/CB, PR/CR)
0.28 Vp-p/75
(S-Video C)
1.0 Vp-p/75
(composite)
Component video
frequency response:
5 Hz~50 MHz
Tuning frequency range: 87.5~107.9 MHz
Usable sensitivity:
Stereo 17.2 dBf, 2.0 µV (75
IHF)
Mono 11.2 dBf, 1.0 µV (75
IHF)
S/N ratio:
Stereo 67 dB (IHF-A)
Mono 70 dB (IHF-A)
Frequency response:
30 Hz~15 kHz/+1 dB, Ð1 dB
Stereo separation:
45 dB at 1 kHz
Tuning frequency range: 530~1710 kHz
Usable sensitivity:
30 µV
S/N ratio:
40 dB
Power supply:
AC 120 V, 60 Hz
Power consumption:
110 W
Standby power
consumption:
1.70 W
Dimensions
(W x H x D):
17-1/8" x 3-9/16" x 14-7/16"
(435 x 91 x 367 mm)
Weight:
14.3 lbs. (6.5 kg)
Component video inputs:2 (COMPONENT VIDEO 1, 2)
S-Video inputs:
3 (DVD, VIDEO 1, VIDEO 2)
Video inputs:
3 (DVD, VIDEO 1, VIDEO 2)
Component video
outputs:
1 (MONITOR)
S-Video outputs:
2 (MONITOR, VIDEO 1)
Video outputs:
2 (MONITOR, VIDEO 1)
Digital inputs:
3 (Optical 1, 2, Coaxial)
Analog inputs:
5 (AUX, VIDEO 1, VIDEO 2, TV, DVD)
Multichannel analog
inputs:
1
Analog outputs:
1 (VIDEO 1)
Subwoofer pre out:
1
Speaker outputs:
6
Phones:
1


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2. To initialize the unit
The TX-L55/LR552 contain a micro processor for signal processing
and control functions. In very rare situations, severe interference,
noise from an external source, or static electricity may cause it to lockup.
In the unlikely event that this happens, unplug the power cord from the
wall outlet, wait at least Þve seconds, and then plug it back in again.
3. Safety-check out
(U.S.A. model only)
After correcting the original service problem, perform the
following safety check before releasing the set to the customer.
Leakage Current Check
Measure leakage current to a known earth ground(water pipe,
conduit, etc.) by connecting a leakage current tester between
the earth ground and exposed metal parts of the appliance
(input/output terminals, screwheads,metal overlays, etc.).
Plug the power supply cord directly into a 120V AC 60 Hz outlet
and turn Standby switch on. Any current meausred must not
exceed 0.5mA.
1. Replacing the fuses
This symbol located near the fuses indicates that the
fuse used is fast operating type. For continued protection against
fire hazard, replace with same type fuse. For fuse rating refer to
the marking adjacent to the symbol.
Ce symbole indique que le fusible utlise est a rapide.
Pour une protection permanente, n'untiliser que fusibles de
meme type. Ce darnier est la qu le present symbol est
appse.
4.
5.Setting the AM tuning step frequency
(Asian models only)
CIRCUIT NO. PART NO.
DESCRIPTION
Note: <D>:120V model only
<P>: 230V model only
<G>: 220V model only
F9001
252254 or
2.5A-T/UL-ST2 or
252160
2.5A-UL/T-237 <D>
F9001
252273 or
1.6A-SE-TL250V or
252073
1.6A-SE-EAK <P/G>
To reset the TX-L55/LR552 to its f actor y defaults, turn it on and,
while holding down the [
] TUNING button, press the
[STANDBY/ON] button. When the reset is complete,
"Clear" appears on the display and the TX-L55/LR552 enter
Standby mode.
Memory backup
The TX-L55/LR552 use a battery-less memory backup sys-
tem (C7001) in order to retain radio presets and other settings
when it's unplugged or in the case of a po wer failure.
Although no batteries are required, it must be plugged
into an AC outlet in order to charge the backup system.
Once it has been charged, the TX-L55/LR552 will retain the
settings for several weeks, although this depends on
the environment and will be shorter in humid climates.
If you are using the Asian model, you need to set the AM
tuning interval for compatibility with AM broadcasts in
your particular country. The initial setting is 9 kHz.
1
Use the INPUT SELECTOR [TUN]
button to select AM.
2
Press the REMOTE MODE [AMP]
button followed by the [SETUP]
button.
TUN
AMP
TUNER
Note:
All presets will be deleted when you change the AM
3
Use the Up and Down [
]/[
]
buttons to select Ò6.Hardware,Ó
and then press [ENTER].
4
Use the Left and Right [
]/[
]
buttons to select:
9 K: North America
10 K: Other countries
5
Press the [SETUP] button.
The setup menu closes.
ENTER
TX-L55/LR552
SERVICE PROCEDURES


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TX-LR552
TX-LR552
EXPLODED VIEW
T9001
P9301
F9001
L901
P1101
1
2
3
2
3
2
3
2
3
4
4
4
4
5
5
6
4
11
18
29
27
40
40
32
35
37
37
37
41
P850
24
15
17
11
38
17
27
28
28
36
7
9
8
8
31
U6
U1
U3
U4
U5
U8
U9
U11
U13
U21
19
25
21
13
8
22


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TX-L55/LR552
BLOCK DIAGRAM
V2CIN
V2YIN
DVDYIN
V1CIN
DVDCIN
V1YIN
DVDVIN
V1VIN
V1YOUT
V1VOUT
V1COUT
C MONITOR OUT
Y MONITOR OUT
V2VIN
V MONITOR OUT
+6dB
+6dB
+6dB
TV
IN
CD
L
V1
OUT
R
L
V1
IN
R
L
R
L
R
L
R
L
SL
C
DVD
IN
SW
SR
TONE
TONE
Q4301
BD3817
AUDIO SEL
+
AK4588
Q7800
CODEC
DSP
CS494003CQ
Q7501
U21
TUNER PACK
Q2001
MM1093NF
FSC GEN.
Q2005
3LINE
Y/C SEP.
TC90A69F
Q2051
+6dB
MX29LV040
ROM
Q7502
M
M
MUTE
MUTE
MUTE
MUTE
MUTE
MUTE
MUTE
MUTE
MUTE
Q1181
BU1924FS
RDS
DECODER
Q2106
Y/C MIX
MM1512
+
V2
IN
P2104
P2104
P2104
P2104
P
2102
P2102
P2102
P2102
NJM2279M
VIDEO SEL
Q2101-3
COAX
IN
OPT
IN
R
DAC
L
DAC
R
DAC
SR
DAC
SL
DAC
C
DAC
SB
DAC
SW
D TYPE ONLY
P4303
10
2
1
3
5
4
6
8
7
9
P4302
10
2
1
3
5
4
6
8
7
9
-1
-1
-1
-1
-1
-1
-1
-1
U2701
TORX179L
3
2
1
U2702
TORX179L
3
2
1
P2703
P4301
7
2
1
3
5
4
6
PP TYPE ONLY
A
1
2
3
4
5
BCD