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AV RECEIVER/AV AMPLIFIER
RX-V550/HTR-5750
RX-V450/HTR-5740/DSP-AX450
SERVICE MANUAL
RX-V450/HTR-5740/DSP-AX450
RX-V550/HTR-5750
IMPORTANT NOTICE
This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel.
It has been assumed that basic service procedures inherent to the industry, and more specifically YAMAHA Products, are already
known and understood by the users, and have therefore not been restated.
WARNING: Failure to follow appropriate service and safety procedures when servicing this product may result in personal
injury, destruction of expensive components, and failure of the product to perform as specified. For these reasons,
we advise all YAMAHA product owners that any service required should be performed by an authorized
YAMAHA Retailer or the appointed service representative.
IMPORTANT: The presentation or sale of this manual to any individual or firm does not constitute authorization, certification or
recognition of any applicable technical capabilities, or establish a principle-agent relationship of any form.
The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research, engineering, and
service departments of YAMAHA are continually striving to improve YAMAHA products. Modifications are, therefore, inevitable
and specifications are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, please
contact the distributor's Service Division.
WARNING: Static discharges can destroy expensive components. Discharge any static electricity your body may have
accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this buss).
IMPORTANT: Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the unit.
I CONTENTS
TO SERVICE PERSONNEL .......................................... 2 AMP ADJUSTMENT 43
IMPEDANCE SELECTOR ............................................. 3 IC DATA ................................................................. 44~49
FRONT PANELS ........................................................ 4~6 BLOCK DIAGRAM ................................................. 50~51
REAR PANELS ........................................................ 7~15 DISPLAY DATA ........................................................... 52
REMOTE CONTROL PANELS .................................... 16 PRINTED CIRCUIT BOARD .................................. 53~73
SPECIFICATIONS / 17~18 PIN CONNECTION DIAGRAM .................................... 74
INTERNAL VIEW ......................................................... 18 SCHEMATIC DIAGRAM ........................................ 75~85
DISASSEMBLY PROCEDURES ......... 19~21 PARTS LIST ......................................................... 87~123
SELF DIAGNOSIS FUNCTION (DIAG) REMOTE CONTROL .......................................... 124~125
22~42
100884
P.O.Box 1, Hamamatsu, Japan
RX-V550/HTR-5750
RX-V450/HTR-5740/DSP-AX450
I REMOTE CONTROL PANELS
RX-V550 (U, C, A, L, R, T, K models) RX-V550 (B, G, E models) RX-V450 (B, G, E models)
HTR-5750 (U, C, A, T, K models) HTR-5740 (G, E models)
RX-V450 (U, C, A, L, R, T, K models)
HTR-5740 (U, C, A models)
DSP-AX450 (J model)
RX-V450/HTR-5740/DSP-AX450
RX-V550/HTR-5750
16
RX-V550/HTR-5750
RX-V450/HTR-5740/DSP-AX450
I SPECIFICATIONS /
I Audio Section Damping Factor I FM Section HTR-5740 ........................ Gold color (T, K) models
20 Hz to 20 kHz, SPEAKER-A 100 or more Black color (U, C, G, E) models
Minimum RMS Output Power (Power Amp. Section) Input Sensitivity / Input Impedance Tuning Range Silver color (U, C, A, G, E) models
CD, etc. 200 mV / 47 k-ohms U, C models 87.5 to 107.9 MHz DSP-AX450 ..................... Gold color (J) model
[RX-V550/HTR-5750] MULTI CH IN A, B, G, E, T, K models 87.5 to 108.0 MHz Silver color (J) model
(20 Hz to 20 kHz, 0.06% THD, 8 ohms) FRONT L/R, CENTER, SURROUND L/R, SUB WOOFER L, R models 87.5 to 108.0 / 87.50 to 108.00 MHz Accessories
FRONT L/R 90 W + 90 W 200 mV / 47 k-ohms J model 76.0 to 90.0 MHz Remote Control x 1, Batteries (Manganese Dry) x 4 (RAV250/
CENTER 90 W Maximum Input Signal Level / 50dB Quieting Sensitivity (IHF) RAV251) / x 2 (RAV302), Indoor FM Antenna x 1, AM Loop
SURROUND L/R 90 W + 90 W 1 kHz, 0.5% THD 2.0 V or more (1kHz, 100% Mod.) Antenna x 1, PAL 75/300 Socket [B model]
SURROUND BACK 90 W Mono 2.0 µV (17.3 dBf)
Output Level / Output Impedance
(1 kHz, 0.7% THD, 8 ohms) Stereo 25 µV (39.2 dBf)
REC OUT 200 mV / 1.2 k-ohms
FRONT L/R 105 W + 105 W 20Hz SUB WOOFER 4 V / 1.2 k-ohms Usable Sensitivity (IHF)
CENTER 105 W Mono 1.0 µV (11.2 dBf) * Specifications are subject to change without notice due to product
ZONE2 (RX-V550 U, C, A models) 200 mV / 1.2 k-ohms improvements.
SURROUND L/R 105 W + 105 W Selectivity
SURROUND BACK 105 W Headphone Jack Rated Output / Impedance
70 dB
[RX-V450/HTR-5740] Signal to Noise Ratio (IHF)
(20 Hz to 20 kHz, 0.06% THD, 8 ohms) CD, etc. (1 kHz, 50 mV, 8 ohms) 150 mV / 100 ohms U .......... U.S.A. model C ...... Canadian model
Mono / Stereo 76 dB / 70 dB
FRONT L/R 85 W + 85 W Frequency Response A .......... Australian model B ...... British model
CD, etc. to FRONT L/R (10 Hz to 100 kHz) +0/-3.0 dB Harmonic Distortion
CENTER 85 W (1 kHz) G .......... European model E ...... South European model
SURROUND L/R 85 W + 85 W Total Harmonic Distortion Mono/Stereo 0.2 / 0.3 % L ........... Singapore model R ...... General model
SURROUND BACK 85 W (20Hz to 20kHz, 40W, 8 ohms) T .......... Chinese model K ...... Korean model
CD, etc. (Effect Off) to FRONT L/R SP OUT 0.06 % or less Stereo Separation
(1 kHz, 0.7% THD, 8 ohms) J ........... Japanese model
1 kHz 42 dB
FRONT L/R 100 W + 100 W Signal to Noise Ratio / (IHF-A Network)
CENTER 100 W CD, etc. (Input shorted) SP OUT Frequency Response
SURROUND L/R 100 W + 100 W 250mV 100 dB or more 20 Hz to 15 kHz +0.5 / -2 dB
SURROUND BACK 100 W Residual Noise (IHF-A Network) Antenna Input
[DSP-AX450] FRONT L/R SP OUT 150 µV or less 75 ohms unbalanced Manufactured under license from Dolby Laboratories.
(20 Hz to 20 kHz, 0.09% THD, 6 ohms) Channel Separation
"Dolby", "Pro Logic", "Surround EX", and the double-D symbol are
FRONT L/R 85 W + 85 W CD, etc. (Input 5.1 k-ohms shorted, 1 kHz/10 kHz) I AM Section trademarks of Dolby Laboratories.
CENTER, REAR CENTER 85 W 60 dB or more/45 dB or more Tuning Range
SURROUND L/R 85 W + 85 W Tone Control Characteristics U, C models 530 to 1,710 kHz
SURROUND BACK 85 W BASS A, B, G, E, T, K, J models 531 to 1,611 kHz
Maximum Power (EIAJ) Boost/Cut ±10 dB (60 Hz) L, R models 530 to 1,710 / 531 to 1,611 kHz
(1kHz, 10% THD) TREBLE "SILENT CINEMA" is a trademark of YAMAHA CORPORATION.
Usable Sensitivity
[RX-V550/HTR-5750] (R, T, K models) Boost/Cut ±10 dB (20 kHz) 300 µV/m
FRONT L/R (8 ohms) 130 W + 130 W Filter Characteristics Antenna
CENTER, REAR CENTER (8 ohms) 130 W FRONT L/R, CENTER, SURROUND L/R SURROUND BACK SP Loop Antenna
SURROUND L/R (8 ohms) 130 W + 130 W Small (H.P.F.)
SURROUND BACK (8 ohms) 130 W fc= 40/60/80/90/100/110/120/160/200 Hz / 12 dB/ oct.
[RX-V450/HTR-5740] (R, T, K models) SUBWOOFER (L.P.F.) I General
FRONT L/R (8 ohms) 125 W + 125 W fc= 40/60/80/90/100/110/120/160/200 Hz / 24 dB/ oct. Power Supply / "DTS" and "DTS-ES Digital Surround" and "Neo:6" are
CENTER, REAR CENTER (8 ohms) 125 W U, C models AC 120 V, 60 Hz trademarks of Digital Theater Systems, Inc.
SURROUND L/R (8 ohms) 125 W + 125 W A model AC 240 V, 50 Hz
I Video Section
SURROUND BACK (8 ohms) 125 W B, G, E models AC 230 V, 50 Hz
[DSP-AX450] Video Signal Type L model AC 220/230-240 V, 50/60 Hz
FRONT L/R (6 ohms) 125 W + 125 W U, C, R, K, J models NTSC R model AC 110/120/220/230-240 V, 50/60 Hz
CENTER, REAR CENTER (6 ohms) 125 W A, B, G, E, L, T models PAL T model AC 220 V, 50 Hz
SURROUND L/R (6 ohms) 125 W + 125 W Video Signal Level K model AC 220 V, 60 Hz
SURROUND BACK (6 ohms) 125 W 1 Vp-p / 75 ohms J model AC 100V, 50/60 Hz
DIN Standard Output Power Per Channel S-Video Signal Level Power Consumption /
(B, G, E, L models) (1 kHz, 0.7% THD, 4 ohms) [RX-V550/HTR-5750/DSP-AX450] U, C models 350 W / 440 VA
A, B, G, E, L, R, T, K models 360 W · DIMENSIONS RX-V550 Except RX-V550
[RX-V550/HTR-5750] Y 1 Vp-p / 75 ohms
(7/8")
(7/8")
FRONT L/R 135 W + 135 W C 0.286 Vp-p / 75 ohms J model 245 W
22
22
CENTER 135 W Component Signal Level (Except J model) Standby Power Consumption (reference data)
SURROUND L/R 135 W + 135 W Y 1 Vp-p / 75 ohms AC240 V / 50 Hz 0.1 W
SURROUND BACK 135 W Cb/Cr 0.7 Vp-p / 75 ohms Maximum Power Consumption [R model]
[RX-V450/HTR-5740] D4-Video Signal Level / (J model) (6ch Drive, 10% THD) 700 W
FRONT L/R 130 W + 130 W Y 1 Vp-p / 75 ohms AC Outlets
376.8 (14-13/16")
CENTER 130 W Cb/Cr 0.7 Vp-p / 75 ohms 2 Switched Outlets
420 (16-1/2")
416 (16-3/8")
SURROUND L/R 130 W + 130 W Maximum Input Level U, C, G, E, T, J models 100 W max. total
380 (15")
SURROUND BACK 130 W 1.5 Vp-p or more L, R models 50 W max. total
IEC Power [B, G, E, L models] Signal to Noise Ratio 1 Switched Outlet
[RX-V550/HTR-5750] 50 dB or more A, B models 100 W max.
FRONT L/R (1 kHz, 0.06% THD, 8 ohms) 100 W + 100 W Monitor Out Frequency Response Dimensions (W x H x D)
[RX-V450/HTR-5740] RX-V550 435 x 171 x 420 mm (17-1/8" x 6-3/4" x 16-1/2")
[RX-V550/HTR-5750] HTR-5750/RX-V450/HTR-5740/DSP-AX450
FRONT L/R (1 kHz, 0.06% THD, 8 ohms) 95 W + 95 W Composite Video Signal Level, 435 x 161 x 416 mm (17-1/8" x 6-5/16" x 16-3/8")
Dynamic Power Per Channel (IHF) S-Video Signal Level 5 Hz to 10 MHz, -3 dB
Weight
[RX-V550/HTR-5750] S-Video Signal Level (J model) 5 Hz to 10 MHz, -3 dB
11.0 kg (24 lbs. 4 oz.)
(11/16")
(11/16")
FRONT L/R (8/6/4/2 ohms) 120/155/190/235 W Component Video Signal Level 5 Hz to 60 MHz, -3 dB
17.2
18
[RX-V550/HTR-5750/DSP-AX450] Finish
[RX-V450/HTR-5740]
Composite Video Signal Level 5 Hz to 10 MHz, -3 dB RX-V550 .......................... Gold color (L, R, T, K) models
FRONT L/R (8/6/4/2 ohms) 115/150/185/230 W
Black color (U, C, A, B, G, E, R) models
150 (5-15/16")
[DSP-AX450] S-Video Signal Level (J model) 5 Hz to 10 MHz, -3 dB
140 (5-1/2")
171 (6-3/4")
161 (6-5/16")
Component Video Signal Level (Except J model) Titanium color (B, G, E models)
FRONT L/R (8/6/4/2 ohms) /125/155/200 W HTR-5750 ............................ Gold color (T, K) models
Dynamic Headroom (U, C models) 5 Hz to 60 MHz, -3 dB
D4-Video Signal Level (J model) 5 Hz to 60 MHz, -3 dB Black color (U, C) models
[RX-V550/HTR-5750] Silver color (U, C, A) models
8 ohms 1.25 dB RX-V450 .......................... Gold color (L, R, T, K) models
Black color (U, C, A, B, G, E, R) models 435 (17-1/8")
(13/16")
(13/16")
[RX-V450/HTR-5740]
21
21
8 ohms 1.31 dB Silver color (C, L, R) models
Titanium color (B, G, E models) Unit : mm (inch)/ 17
RX-V550/HTR-5750
RX-V450/HTR-5740/DSP-AX450
· Set Menu Table / · The variable range of the parameter (Min/Max/Step)
CATEGORY MAIN MENU SUB MENU SELECT MENU VALUE [INITIAL] Unit Pro Logic IIx Music Parameter Unit
BASIC SETUP ROOM : S >M L S / [M] / L DSP LEVEL -6/+3/1 dB PLII/PLIIx PLII/PLIIx
DELAY 1/99/1 ms PANORAMA OFF/ON
SUBWOOFER : YES [YES] / NONE
SPEAKER : 6spk 2 / 3 / 4 / 5 / [6] DIMENSIONS -3/+3/1
6ch Stereo Parameter Unit CT WIDTH 0/7/1
>SET CANCEL [SET] / CANCEL
CHECK OK? : YES [YES] / NO CT LEVEL 0/100/1 %
MANUAL SETUP 1 SOUND MENU A ) SPEAKER SET CENTER : SML NONE / [SML] / LRG SL LEVEL 0/100/1 % DTS Neo:6 Music Parameter Unit
FRONT : LARGE SMALL / [LARGE] SR LEVEL 0/100/1 % C. IMAGE 0/0.5/0.1
SURR LR : SML NONE / [SML] / LRG SB LEVEL 0/100/1 %
SURR B : SML NONE / [SML] / LRG
BASS OUT : BOTH SWFR / FRONT / [BOTH]
Cross Over : 80Hz 40 / 60 / [80] / 100 / 110 / 120 / 160 / 200 Hz
SWFR PHASE : NRM [NRM] / REV I INTERNAL VIEW
B ) SP LEVEL L ·····||····· R [CENTER] ± 10 step
RX-V550
C ·····||·····
RL ·····||····· 1 23 4 5 678 9 0 1 SUBTRANS P.C.B.
RC ·····||····· 2 POWER (2) P.C.B. (R, L models only)
RR ·····||····· 3 FUNCTION (5) P.C.B. (U, C, A models only)
SWFR·····||····· 4 MAIN (2) P.C.B.
C ) SP DISTANCE UNIT : feet [feet] / meters 5 Tuner
FRONT L 10.0ft feet : 1.0 to 80.0 ft [7.0ft] / 0.5 ft step 6 FUNCTION (7) P.C.B.
FRONT R 10.0ft A 7 FUNCTION (3) P.C.B.
CENTER 10.0ft 8 FUNCTION (4) P.C.B.
SURR L 10.0ft
B 9 FUNCTION (8) P.C.B.
SURR R 10.0ft C 0 FUNCTION (6) P.C.B.
D A FUNCTION (2) P.C.B.
SURR B 7.0ft
SWFR 10.0ft B DSP P.C.B.
E C MAIN (1) P.C.B.
FRONT L 3.00m meters : 0.30 to 24.00 m [3.00m] / 0.10 m step F
FRONT R 3.00m D FUNCTION (1) P.C.B.
CENTER 3.00m
G E POWER (1) P.C.B.
F MAIN (7) P.C.B.
SURR L 3.00m
G MAIN (4) P.C.B.
SURR R 3.00m
H OPERATION (4) P.C.B.
SURR B 3.00m
I OPERATION (1) P.C.B.
SWFR 3.00m
J OPERATION (3) P.C.B.
D ) CENTER GEQ TEST : >OFF ON [OFF] / ON
L K J I H K OPERATION (2) P.C.B.
100Hz -||- 0 -6 dB to +6 dB [0 dB] / 0.5 STEP L Power Transformer
300Hz -||- 0
1kHz -||- 0
3kHz -||- 0 HTR-5750/RX-V450/HTR-5740/DSP-AX450
10kHz -||- 0
1 2 34 5 678 9 0 1 SUBTRANS P.C.B.
E ) LFE LEVEL SP LFE : 0 -20 dB to 0 dB [0 dB] / 1 STEP
2 POWER (2) P.C.B. (R, L models only)
HP LFE : 0 -20 dB to 0 dB [0 dB] / 1 STEP
3 VIDEO P.C.B. (DSP-AX450 only)
F ) D . RANGE SP D . R : MAX MIN / STD / [MAX] 4 MAIN (2) P.C.B.
HP D . R : MAX MIN / STD / [MAX] 5 Tuner
G ) AUDIO SET MUTE : MUTE -20 dB / [MUTE] 6 FUNCTION (7) P.C.B. (Except DSP-AX450)
DELEY : 0 ms 0 ms to 160 ms / 1 step A 7 FUNCTION (3) P.C.B. (HTR-5750, DSP-AX450 only)
( Except RX-V550 ) DUAL MONO : MAIN [MAIN] / SUB / ALL 8 FUNCTION (4) P.C.B.
2 INPUT MENU A ) I / O ASSIGN C . V (A) : DVD [DVD] / VCR / V-AUX / DTV/CBL B 9 FUNCTION (8) P.C.B.
C . V (B) : DVT/CBL DVD / VCR / V-AUX / [DTV/CBL] C 0 FUNCTION (6) P.C.B.
OUT (1) : MD/CD-R [MD/CD-R] / CD / VCR / V-AUX / DTV/CBL / DVD D A FUNCTION (2) P.C.B.
B DSP P.C.B.
IN (2) : MD/CD-R [MD/CD-R] / CD / VCR / V-AUX / DTV/CBL / DVD
E C MAIN (1) P.C.B.
IN (3) : DVD MD/CD-R / CD / VCR / V-AUX / DTV/CBL / [DVD]
F D FUNCTION (1) P.C.B.
IN (4) : DTV/CBL MD/CD-R / CD / VCR / V-AUX / [DTV/CBL] / DVD E POWER (1) P.C.B.
B ) INPUT MODE > AUTO / LAST [AUTO] / LAST G F MAIN (7) P.C.B.
3 OPTION MENU A ) DISPLAY SET DIMMER : 0 -4 to 0 / 1 step G MAIN (5) P.C.B.
V CONV : ON OFF / [ON] H OPERATION (4) P.C.B.
B ) MEMORY GUARD MEM . GUARD : OFF [OFF] / ON I OPERATION (1) P.C.B.
C ) PARAM . INI J OPERATION (5) P.C.B.
D ) ZONE SET SP B : FRONT [FRONT] / ZONE B K OPERATION (2) P.C.B.
ML K J I H L OPERATION (3) P.C.B.
M Power Transformer
18
RX-V550/HTR-5750
RX-V450/HTR-5740/DSP-AX450
RX-V550
7 8
I DISASSEMBLY PROCEDURES
(Remove parts in the order as numbered.)
Disconnect the power cable from the AC outlet.
1. Removal of Top Cover 4. Removal of Sub Chassis Unit
a. Remove 4 screws (1) and 4 screws (2). (Fig. 1) a. Remove 2 screws (5) and then slide the Sub Chassis Unit
b. Slide the Top Cover rearward to remove it. (Fig. 1) forward. (Fig. 1)
b. Loosen the harness fixture fixing the cable.
2. Removal of Front Panel Unit c. Remove CB306, CB309, CB505 and CB863 and then remove
a. Remove 2 Knobs. (Fig. 1) the Sub Chassis Unit. (Fig. 1)
b. Remove 6 screws (3) and then remove the Front Panel Unit.
(Fig. 1)
2
Top Cover
3. Removal of Plate Side
a. Remove 2 push rivets (4). (Fig. 1)
2 Fig. 3
b. Remove the Plate Side. (Fig. 1)
1
6. Removal of FUNCTION (1) ~ (8) P.C.B.s and Tuner
a. Remove CB307, CB351, CB502 and CB503. (Fig. 2)
Plate Side b. Remove 21 (U, C, A models) / 20 (except U, C, A models)
screws (8). (Fig. 3)
Sub Chassis Unit 1 c. Remove FUNCTION (1) ~ (8) P.C.B.s. and the Tuner. (Fig. 4)
CB863 CB505
4
3
FUNCTION (4) P.C.B. FUNCTION (2) P.C.B.
5 FUNCTION (3) P.C.B. FUNCTION (8) P.C.B.
FUNCTION (7) P.C.B. FUNCTION (6) P.C.B.
CB306 FUNCTION (5) P.C.B. P.C.B.
(U, C, A models only)
CB309
3 Plate Side
5
4 Tuner
Knob Front Panel Unit
Fig. 1
5. Removal of DSP P.C.B. CB502
a. Remove 1 screw (6). (Fig. 2) CB503
b. Remove 7 screws (7). (Fig. 3) FUNCTION (2) P.C.B. FUNCTION (1) P.C.B.
c. Remove CB2. (Fig. 2)
d. Lift up the FUNCTION (2) P.C.B. and remove the CB1. (Fig. 2)
e. Remove the DSP P.C.B. with the Support/DSP. (Fig. 2) DSP P.C.B.
Fig. 4
CB1
CB2
Support/DSP
6
CB307
CB351
Fig. 2
19
RX-V550/HTR-5750
RX-V450/HTR-5740/DSP-AX450
HTR-5750 RX-V450/HTR-5740/DSP-AX450
7. Removal of MAIN (1), MAIN (5), MAIN (7) and
POWER (1) P.C.B.s I DISASSEMBLY PROCEDURES
a. Remove CB351, CB354 and CB503. (Fig. 5)
(Remove parts in the order as numbered.)
b. Remove 2 screws (9), 2 screws (0) and 3 screws (A).
Disconnect the power cable from the AC outlet.
(Fig. 5)
c. Remove MAIN (1), MAIN (5), MAIN (7) and POWER (1) 1. Removal of Top Cover
P.C.B.s.. (Fig. 5) a. Remove 4 screws (1) and 4 screws (2). (Fig. 1) 1 2
b. Slide the Top Cover rearward to remove it. (Fig. 1)
CB354
POWER (1) P.C.B. 2. Removal of Front Panel Unit
CB503 a. Remove 7 screws (3) and then slide the Front Panel Unit 3
A forward. (Fig. 1)
0
b. Loosen the harness fixture fixing the cable.
c. Remove CB306, CB309, CB505 and CB863 and then remove
A the Front Panel Unit. (Fig. 1)
Top Cover 2
2
CB351
1
MAIN (1) P.C.B.
9
MAIN (7) P.C.B.
9 MAIN (5) P.C.B. CB863 Front Panel Unit
1
Fig. 5 CB505
3
When checking the P.C.B.:
· Put a Cloth over the equipment. Put the MAIN (1), (5), (7)
and POWER (1) P.C.B.s together with the heat sink upright
3
on the Cloth and check them. (Fig. 6) CB306
· Reconnect all cables (connectors) that have been 3
CB309
disconnected.
· When connecting the flat cable, use care for the polarity.
Fig. 1
· The P.C.B. removed from the rear panel does not work 3. Removal of DSP P.C.B.
because its grounding is loose. Be sure to connect the a. Remove 1 screw (4). (Fig. 2) 4
ground of each P.C.B. to the chassis or GND with a jumper b. Remove 7 (HTR-5750), 5 (RX-V450, HTR-5740) screws (5). 5
wire or the like. (Fig. 3)
c. Remove CB2. (Fig. 2)
d. Lift up the FUNCTION (2) P.C.B. and remove the CB1. (Fig. 2)
e. Remove the DSP P.C.B. with the Support/DSP. (Fig. 2)
CB502
CB503
FUNCTION (2) P.C.B.
DSP P.C.B.
CB1
CB2
Support/DSP
4
CB307
Fig. 6 CB351
Fig. 2
20
RX-V550/HTR-5750
RX-V450/HTR-5740/DSP-AX450
HTR-5750/RX-V450/HTR-5740 DSP-AX450 5. Removal of MAIN (1), MAIN (5), MAIN (7) and
POWER (1) P.C.B.s
5 6 5 6 a. Remove CB351, CB354 and CB503. (Fig. 5)
b. Remove 2 screws (7), 2 screws (8) and 3 screws (9). 7 8 9
(Fig. 5)
c. Remove MAIN (1), MAIN (5), MAIN (7) and POWER (1)
P.C.B.s.. (Fig. 5)
CB354
POWER (1) P.C.B.
CB503
9
8
9
HTR-5750 only
Fig. 3
CB351