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AV RECEIVER
RX-V420/RX-V420RDS/
HTR-5440/HTR-5440RDS
SERVICE MANUAL
VOLUME
RX-V420RDS
D I G I TA L




RDS MODE/FREQ EON




HTR-5440/HTR-5440RDS
D I G I TA L




RX-V420/RX-V420RDS/
SURROUND
STANDBY
/ON PTY SEEK
MODE START




INPUT MODE 6CH INPUT


PRESET
BASS TREBLE BALANCE SPEAKERS /TUNING FM/AM
INPUT
A B PROGRAM EFFECT PRESET/TUNING A/B/C/D/E
EDIT
TUNING
MEMORY MODE

­ + ­ + L R ON OFF
MAN'L/AUTO FM AUTO/MAN'L MONO

PHONES VIDEO L AUDIO R




SILENT VIDEO AUX




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 .......................................... 1 SELF DIAGNOSIS FUNCTION (DIAG) ................... 9~24
IMPEDANCE SELECTOR ............................................. 1 AMP ADJUSTMENTS .................................................. 24
FRONT PANELS ........................................................ 2~3 DISPLAY DATA ..................................................... 25~26
REMOTE CONTROL TRANSMITTER .......................... 3 IC DATA ................................................................. 27~32
REAR PANELS .......................................................... 4~5 BLOCK DIAGRAM ................................................. 33~36
SPECIFICATIONS .......................................................... 6 PRINTED CIRCUIT BOARD .................................. 37~52
INTERNAL VIEW ........................................................... 7 IC BLOCK DIAGRAM ............................................ 53~54
DISASSEMBLY PROCEDURES ................................... 8 SCHEMATIC DIAGRAM ........................................ 55~58
PARTS LIST ........................................................... 59~72
REMOTE CONTROL TRANSMITTER .................. 73~76




100754
P.O.Box 1, Hamamatsu, Japan
RX-V420/RX-V420RDS/HTR-5440/HTR-5440RDS




I TO SERVICE PERSONNEL
1. Critical Components Information AC LEAKAGE
Components having special characteristics are marked s WALL EQUIPMENT TESTER OR
and must be replaced with parts having specifications equal OUTLET UNDER TEST EQUIVALENT
to those originally installed.
2. Leakage Current Measurement (For 120V Models Only)
When service has been completed, it is imperative to verify
that all exposed conductive surfaces are properly insulated
from supply circuits.
INSULATING
G Meter impedance should be equivalent to 1500 ohm shunted TABLE
by 0.15µF.
G Leakage current must not exceed 0.5mA.
G Be sure to test for leakage with the AC plug in both polarities.




WARNING: CHEMICAL CONTENT NOTICE!
HTR-5440/HTR-5440RDS
RX-V420/RX-V420RDS/




The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and /or plastic
(where applicable) components may also contain traces of chemicals found by the California Health and Welfare Agency
(and possibly other entities) to cause cancer and/or birth defects or other reproductive harm.

DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REA-
SON WHATSOEVER!

Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose
eyes to solder/flux vapor!

If you come in contact with solder or components located inside the enclosure of this product, wash your hands before
handling food.




I IMPEDANCE SELECTOR · DIMENSIONS




(13/16")
21.3
389.8 (15-3/8")
352.5 (13-7/8")
16
(5/8")




IMPEDANCE SELECTOR

WARNING:
130 (5-1/8")

151 (5-15/16")




Do not change the IMPEDANCE SELECTOR
switch setting while the power to this unit is
on, otherwise this unit may be damaged.

435 (17-1/8")
21
(13/16")




Unit : mm (inch)


1
RX-V420/RX-V420RDS/HTR-5440/HTR-5440RDS




I FRONT PANELS
RX-V420 (U, C, A, R, T models)


VOLUME
RX-V420
D I G I TA L




D I G I TA L


SURROUND
STANDBY
/ON




INPUT MODE 6CH INPUT


PRESET
BASS TREBLE BALANCE SPEAKERS /TUNING FM/AM
INPUT
A B PROGRAM EFFECT PRESET/TUNING A/B/C/D/E
EDIT
TUNING
MEMORY MODE

­ + ­ + L R ON OFF
MAN'L/AUTO FM AUTO/MAN'L MONO

PHONES VIDEO L AUDIO R




HTR-5440/HTR-5440RDS
SILENT VIDEO AUX




RX-V420/RX-V420RDS/
RX-V420RDS (B, G models)


VOLUME
RX-V420RDS
D I G I TA L




RDS MODE/FREQ EON
D I G I TA L


SURROUND
STANDBY
/ON PTY SEEK
MODE START




INPUT MODE 6CH INPUT


PRESET
BASS TREBLE BALANCE SPEAKERS /TUNING FM/AM
INPUT
A B PROGRAM EFFECT PRESET/TUNING A/B/C/D/E
EDIT
TUNING
MEMORY MODE

­ + ­ + L R ON OFF
MAN'L/AUTO FM AUTO/MAN'L MONO

PHONES VIDEO L AUDIO R




SILENT VIDEO AUX




HTR-5440 (U, C, A, R, T models)


VOLUME
HTR-5440
D I G I TA L




D I G I TA L


SURROUND
STANDBY
/ON




INPUT MODE 6CH INPUT


PRESET
BASS TREBLE BALANCE SPEAKERS /TUNING FM/AM
INPUT
A B PROGRAM EFFECT PRESET/TUNING A/B/C/D/E
EDIT
TUNING
MEMORY MODE

­ + ­ + L R ON OFF
MAN'L/AUTO FM AUTO/MAN'L MONO

PHONES VIDEO L AUDIO R




SILENT VIDEO AUX




2
RX-V420/RX-V420RDS/HTR-5440/HTR-5440RDS



HTR-5440RDS (G model)


VOLUME
HTR-5440RDS
D I G I TA L




RDS MODE/FREQ EON
D I G I TA L


SURROUND
STANDBY
/ON PTY SEEK
MODE START




INPUT MODE 6CH INPUT


PRESET
BASS TREBLE BALANCE SPEAKERS /TUNING FM/AM
INPUT
A B PROGRAM EFFECT PRESET/TUNING A/B/C/D/E
EDIT
TUNING
MEMORY MODE

­ + ­ + L R ON OFF
MAN'L/AUTO FM AUTO/MAN'L MONO

PHONES VIDEO L AUDIO R




SILENT VIDEO AUX
HTR-5440/HTR-5440RDS
RX-V420/RX-V420RDS/




I REMOTE CONTROL TRANSMITTER
U, C, A, R, T models B, G models




3
RX-V420/RX-V420RDS/HTR-5440/HTR-5440RDS




I REAR PANELS
U model




HTR-5440/HTR-5440RDS
RX-V420/RX-V420RDS/
C model




A model




4
RX-V420/RX-V420RDS/HTR-5440/HTR-5440RDS



B model
HTR-5440/HTR-5440RDS
RX-V420/RX-V420RDS/




G model




R, T model




5
RX-V420/RX-V420RDS/HTR-5440/HTR-5440RDS




I SPECIFICATIONS
I Audio Section I FM Section
Minimum RMS Output Power (Power Amp. Section) Tuning Range
(20 Hz to 20 kHz, 0.06% THD, 8 ohms) [U, C models] ................................................... 87.5 to 107.9 MHz
MAIN ......................................................................... 65W + 65W [A, B, G models] ............................................... 87.5 to 108.0 MHz
CENTER ............................................................................... 65W [R, T models] ....................... 87.5 to 108.0 / 87.50 to 108.00 MHz
REAR ........................................................................ 65W + 65W 50 dB Quieting Sensitivity (IHF)
(1 kHz, 0.09% THD, 8 ohms) (100% Mod)
MAIN ......................................................................... 70W + 70W Mono .................................................................. 2.0 µV (17.3 dBf)
CENTER ............................................................................... 70W Stereo .................................................................. 25 µV (39.2 dBf)
REAR ........................................................................ 70W + 70W
Usable Sensitivity (IHF)
Maximum Power (EIAJ) [R, T models] Mono .................................................................. 1.0 µV (11.2 dBf)
(1 kHz, 10% THD, 8 ohms)
MAIN ........................................................................... 95W + 95W Selectivity
CENTER ................................................................................. 95W at 400 kHz ............................................................................ 70 dB
REAR .......................................................................... 95W + 95W Signal to Noise Ratio (IHF)
Dynamic Power Per Channel (IHF) Mono / Stereo .......................................................... 76 dB / 70 dB
MAIN L/R (8/6/4/2 ohms) Harmonic Distortion
[U model] .......................................................... 95/115/135/155 W (1 kHz)
[C, A, B, G, R, T models] ................................. 90/110/130/150 W Mono/Stereo ................................................................. 0.2 / 0.3 %
DIN Standard Output Power Per Channel Stereo Separation
MAIN L/R (1 kHz, 0.7% THD, 4 ohms)




HTR-5440/HTR-5440RDS
1 kHz .................................................................................... 45 dB




RX-V420/RX-V420RDS/
[G model] ..................................................................... 95W + 95W
Frequency Response
Dynamic Headroom 20 Hz to 15 kHz .......................................................... +0.5 / -2 dB
8 ohms
[U, C models] .................................................................... 1.18 dB Antenna Input
...................................................................... 75 ohms unbalanced
IEC Power
MAIN L/R (1 kHz, 0.06% THD, 8 ohms) I AM Section
[G model] ..................................................................... 67W + 67W Tuning Range
Damping Factor [U, C models] ..................................................... 530 to 1,710 kHz
MAIN L/R (20 Hz to 20 kHz, 8 ohms) .......................... 60 or more [A, B, G models] ................................................. 531 to 1,611 kHz
[R, T models] .............................. 530 to 1,710 / 531 to 1,611 kHz
Input Sensitivity / Input Impedance
CD, etc. ......................................................... 150 mV / 47 k-ohms Usable Sensitivity
EXT. DECODER ........................................................................................ 300 µV/m
MAIN L/R ................................................... 150 mV / 47 k-ohms Antenna
CENTER, SURROUND L/R, SUBWOOFER ... 150 mV / 40 k-ohms ................................................................................. Loop Antenna
Maximum Input Signal Level I General
CD, etc. (1 kHz, 0.5% THD, Effect On) ................................ 2.2 V
Power Supply
Output Level / Output Impedance [U, C models] ...................................................... AC 120 V, 60 Hz
REC OUT ..................................................... 150 mV / 1.2 k-ohms [R, T models] ............................ AC 110/120/220/240 V, 50/60 Hz
SUB WOOFER [MAIN SP: Small] ...................... 4 V/1.2 k-ohms [A model ] ............................................................ AC 240 V, 50 Hz
Headphone Jack Rated Output / Impedance [B, G models] ...................................................... AC 230 V, 50 Hz
1 kHz, 150 mV, 8 ohms ................................... 0.47 V / 390 ohms Power Consumption
Frequency Response [U model] ............................................................................. 200 W
CD, etc. to MAIN (20 Hz to 20 kHz) ............................. 0 ± 0.5 dB [C model] .............................................................. 210 W / 280 VA
[R, T, A, B, G models] ......................................................... 210 W
Total Harmonic Distortion
(20 Hz to 20 kHz, 35 W / 8 ohms) Maximum Power Consumption
CD, etc. (EFFECT OFF) to MAIN SP OUT ........... 0.025% or less (5ch Drive, 10% THD)
[R model] ............................................................................. 480 W
Signal to Noise Ratio (IHF-A network)
CD, etc. (Input shorted, Effect Off) to MAIN SP OUT AC Outlets
150 mV .................................................................... 96 dB or more 2 switched outlets
250 mV .................................................................. 100 dB or more [U, C, G models] .............................................. 100W max., total
[R, T models] ...................................................... 50W max., total
Residual Noise (IHF-A netwok) 1 switched outlet
MAIN L/R SP OUT ................................................. 150 µV or less [A, B models] ............................................................. 100W max.
Channnel Separation Dimensions (W x H x D)
(Vol -30 dB, Effect Off) ...................... 435 x 151 x 390 mm (17-1/8" x 5-15/16" x 15-3/8")
CD, etc. (Input 5.1 k-ohms terminated, 1 kHz) ............. 60 dB or more
CD, etc. (Input 5.1 k-ohms terminated, 10 kHz) ........... 45 dB or more Weight
.................................................................... 9.5 kg (20 lbs. 15 oz.)
Tone Control Characteristics
Bass: Boost/Cut ................................................ ±10 dB (50 Hz) Accessories
Turnover Frequency ............................................ 350 Hz Remote control transmitter, Manganese batteries, Indoor FM
Treble: Boost/Cut .............................................. ±10 dB (20 kHz) antenna, AM loop antenna
Turnover Frequency ........................................... 3.5 kHz * Specifications are subject to change without notice due to product
Filter Characteristics improvements.
MAIN, Rear SP Small (H.P.F.) .......................... 90 Hz, 12 dB/oct.
SUBWOOFER (L.P.F.) ...................................... 90 Hz, 18 dB/oct. U .......... U.S.A. model C ...... Canadian model
I Video Section A .......... Australian model B ...... British model
G .......... European model R ...... General model
Video Signal Type T .......... China model
[U, C, R, T models] .............................................................. NTSC
[A, B, G models] ...................................................................... PAL Manufactured under license from Dolby Laboratories. "Dolby", "AC-
Video Signal Level 3", "Pro Logic", and the double-D symbol are trademarks of Dolby
............................................................................ 1 Vp-p / 75 ohms
Laboratories. © 1992-1997 Dolby Laboratories. All rights reserved.
Maximum Input Level
.......................................................................................... 1.5 Vp-p
Manufactured under license from Digital Theater Systems, Inc. US
Signal to Noise Ratio
................................................................................. 50 dB or more Pat. No. 5,451,942 and other world-wide patents issued and pending.
Monitor Out Frequency Response "DTS", "DTS Digital Surround", are trademarks of Digital Theater
S-Video Signal Level ................................. 5 Hz to 10 MHz, -3 dB Systems, Inc. copyright 1996 Digital Theater Systems, inc. All rights
reserved.


6
RX-V420/RX-V420RDS/HTR-5440/HTR-5440RDS



· Set Menu Table
No. SET MENU PRESET VALUE SETTING RANGES
1. SPEAKER SET
1A CENTER SPEAKER LARGE LARGE/SMALL/NONE
1B MAIN SPEAKER LARGE LARGE/SMALL
1C REAR L/R SPEAKER LARGE LARGE/SMALL/NONE
1D LFE/BASS OUT BOTH SUBWOOFER/MAIN/BOTH
1E MAIN LEVEL NORMAL NORMAL/­10dB
2. HP TONE CTRL BASS : 0dB ­6dB -- +3dB (1dB step)
TREBLE : 0dB ­6dB -- +3dB
3. I/O ASSIGNING
3A OPTICAL IN (1) : DVD CD, DVD, D-TV/CBL, VCR, AUX
(2) : D-TV/CBL CD, D-TV/CBL, VCR, AUX
3B COAXIAL IN (3) : CD CD, MD/CD-R, DVD, D-TV/CBL, VCR, V-AUX, AUX
4. INPUT MODE DVD : AUTO AUTO/LAST
5. DOLBY DIGITAL SET
5A LFE LEVEL SPEAKER : 0dB ­20dB -- 0dB
HTR-5440/HTR-5440RDS
RX-V420/RX-V420RDS/




5B DYNAMIC RANGE SPEAKER : MAX MAX/STD/MIN
6. DTS SET
LFE LEVEL SPEAKER : 0dB ­10dB -- +10dB
7. SPEAKER DELAY TIME CENTER : 0ms 0ms -- 5ms (1ms step)
8. DISPLAY SET DIMMER : 0 ­4 -- 0
9. MEMORY GUARD OFF ON/OFF




I INTERNAL VIEW
1 2 3 4 5 6 7 8
1 MAIN (2) P.C.B.
2 MAIN (7) P.C.B.
3 MAIN (5) P.C.B.
4 MAIN (8) P.C.B.
5 MAIN (4) P.C.B.
6 INPUT (3) P.C.B.
7 INPUT (6) P.C.B.
8 DSP P.C.B.
9 OPERATION (4) P.C.B.
0 INPUT (1) P.C.B.
A OPERATION (3) P.C.B.
B INPUT (4) P.C.B.
C MAIN (1) P.C.B.
D MAIN (6) P.C.B.
E INPUT (5) P.C.B.
F OPERATION (8) P.C.B.
G OPERATION (7) P.C.B.
H OPERATION (6) P.C.B.
I OPERATION (1) P.C.B.
J OPERATION (2) P.C.B. F E D C B A 0 9
G H I J

YAMAHA




7
RX-V420/RX-V420RDS/HTR-5440/HTR-5440RDS




I DISASSEMBLY PROCEDURES
(Remove parts in the order as numbered.)
Disconnect the power cord from the AC outlet.

1. Removal of Top Cover (Fig. 1) Top Cover 1
a. Remove 4 screws (1) and 4 screws (2). 2
b. Slide the Top Cover rearward to remove it.

2. Removal of Front Panel (Fig. 1) Sub Chassis
a. Remove the VOLUME control knob.
b. Remove 8 screws (3) and 1 screw (4).
c. Remove the Front Panel forward while releasing 2 3
5
claws at the bottom.
5 1
3. Removal of Sub Chassis (Fig. 1)




HTR-5440/HTR-5440RDS
Remove 4 screws (5) and then remove the Sub 5




RX-V420/RX-V420RDS/
Chassis forward. 4

4. Removal of DSP P.C.B. (Fig. 2) Claw Front panel
3
a. Remove 6 screws (6) and 3 screws (7).
b. Remove the DSP P.C.B. upward together with the Fig. 1
Shield Case.

5. Removal of MAIN (4) P.C.B. (Fig. 2)
Sheild case
Remove 2 screws (8). The Main (4) PCB can then be (DSP P.C.B) MAIN (4) P.C.B
removed.

6
6. Removal of MAIN (1) P.C.B.
a. Remove 3 screws (7), 2 screws (8), 2 screws (9) and
11 screws (0). (Fig. 2) 6
b. Remove 2 screws (A) and 1 screw (B). (Fig. 3)
c. To check the MAIN (1) P.C.B., spread a rubber sheet 9
and a cloth over it. Then place the MAIN (1) P.C.B.
upside down on the cloth for checking it. (Fig. 4) 8
0
6 00
0
Note: 7
0
When DSP P.C.B., MAIN (4) P.C.B. and MAIN (1)
P.C.B. have been removed from the chassis, the
Fig. 2
ground connection becomes open. Connect the ground
of each P.C.B. to the chassis by using a lead wire.

A B MAIN (1) P.C.B Cloth
Rubber sheet

MAIN (1) P.C.B




Fig. 3 Fig. 4
8
RX-V420/RX-V420RDS/HTR-5440/HTR-5440RDS




I SELF DIAGNOSIS FUNCTION (DIAG)
There are 14 DIAG menu items each of which has sub-menu items. Listed in the table below are menu items and sub-menu
items.

No DIAG menu sub-menu Remote control code (key)
1 DSP THROUGH 1. ANALOG BYPASS 7A-88 (PRG 1)
2. M, C, R, SW CH 7A-89 (PRG 2)
3. Main HPF 7A-8A (PRG 3)
4. FULL BIT ­
5. FULL BIT F ­
2 FRONT CH 1. FRONT NORMAL 7A-8B (PRG 4)
2. FRONT MIX 7A-8C (PRG 5)
3 RAM THROUGH RAM 0dB (2ch/Multi) 7A-10 (PRESET+)
4 PRO LOGIC YSS928 7A-8D (PRG 6)
5 MARGIN CHECK 1. MAIN 3dB Margin 7A-11 (PRESET-)
2. MAIN 12dB Margin 7A-12 (P. PAGE)
HTR-5440/HTR-5440RDS
RX-V420/RX-V420RDS/




3. MAIN 18dB Margin 7A-0C (CD FW)
6 MAIN MIX 1. CENTER -> MAIN 7A-00 (TAPE PLAY)
2. SW -> MAIN 7A-8E (PRG 7)
7 OTHER INPUT EXTERNAL DECODER 7A-8F (PRG 8)
8 DISPLAY CHECK 1. VFD DISP OFF (All segments OFF) 7A-01 (TAPE RW)
2. VFD DISP ALL (All segments ON 100%) 7A-02 (TAPE FW)
3. VFD DIMMER (All segments ON 50%) ­
4. CHECKED PATTERN1 (ON in lattice) 7A-03 (TAPE STOP)
5. CHECKED PATTERN2 (ON in lattice) ­
9 MANUAL TEST 1. TEST ALL 7A-90 (PRG 9)
2. TEST MAIN L 7A-04 (TAPE PAUSE)
3. TEST CENTER 7A-05 (TAPE MUTE)
4. TEST MAIN R 7A-06 (TAPE A/B)
5. TEST REAR R 7A-07 (TAPE DIR A)
6. TEST REAR L 7A-08 (CD PLAY)
7. TEST LFE 7A-09 (CD STOP)
10 PRESET 1. PRESET INHIBIT (memory initialization inhibited) ­
2. PRESET RESERVED (memory initialized) 7A-57 (SLEEP)
11 AD DATA CHECK 1. DC/PS (protection) 7A-0B (CD SKIP-)
2. IMP/PL (impedance/power limiter) ­
3. 0/1/2 (panel key) ­
12 IF STATUS 1. IST (internal status) ­
2. CS1 (channel status 1) ­
3. CS2 (channel status 2) ­
4. CS3 (channel status 3) ­
5. CS4 (channel status 4) ­
6. CS5 (channel status 5) ­
7. BI1 (BSI-DD 1) ­
8. BI2 (BSI-DD 2) ­
9. BI3 (BSI-DD 3) ­
10. BI4 (BSI-DD 4) ­
11. BS1 (BSI-DTS 1) ­
12. BS2 (BSI-DTS 2) ­
13. BS3 (BSI-DTS 3) ­
14. BS4 (BSI-DTS 4) ­
15. YS1 (YSS928-1) ­
16. YS2 (YSS928-2) ­
17. YS3 (YSS928-3) ­
13 DSP RAM CHECK BUS CHECK 7A-0A (CD SKIP+)
14 VERSION/CHECK SUM/PORT 1. VER. (Version information) 7A-0D (CD REW)
2. 1/2 (Checksum 1/2) ­
3. PORT (Port check) ­

9
RX-V420/RX-V420RDS/HTR-5440/HTR-5440RDS



· Starting DIAG
Press the "POWER " (STANDBY/ON) key of the main unit while pressing the Keys of main unit
"FM/AM " key and the "INPUT MODE " key simultaneously, and DIAG will be
INPUT MODE
activated. FM/AM




· Starting DIAG in the protection cancel mode Turn on the power while
If the protection function activates and causes hindrance to trouble diagnosis, pressing these keys.
disable the protection function as described below, and it will be possible to enter
the DIAG mode. (The protection function other than the excess current detect
function will be disabled.)

Press the "POWER" (STANDBY/ON) key while pressing the "FM/AM" key and
the "INPUT MODE" key simultaneously. At this time, keep pressing the "FM/AM"
key and the "INPUT MODE" for 3 seconds or longer.

In this mode, "SLEEP" in the FL display of the main unit flashes.




HTR-5440/HTR-5440RDS
RX-V420/RX-V420RDS/
CAUTION!
Using this product with the protection function disabled may cause damage to itself. Use special care for this point when
using this mode.



· Canceling DIAG
Turn off the power by pressing the "POWER" (STANDBY/ON) key of the main unit or the "STANDBY" key of the remote
control unit.

CAUTION: When canceling this function, check that DIAG menu No.10 PRESET (memory initialization inhibited/reserved)
has been set. [To keep the user memory, be sure to select "INHI" (initialization inhibited) from the No.10 PRESET menu
before canceling the DIAG function.]



· Display at the start of DIAG
On the FL display of the main unit, an opening message (including the version and the protection history) appears for a few
seconds followed by the diagnostic menu display of 1. ANALOG BYPAS.

Opening message DIAG menu display
When there is no Version (1 alphabet)
protection history (*1)
After a few
seconds



(*1) If a protection function history has been recorded, the type of the protection function and the voltage value recorded last
are displayed.

If the protection function activates after DIAG has been started and the power is turned off;
When the protection function (*2) activates, the protection function history appears on the display and the power turns off.
Repair the faulty parts according to the displayed history.

(*2) When an excess current or any other faulty condition is found with the power source, DC, etc., the protection function
forces the power to turn off.

I PROTECT display
(When the power is turned on without this abnormality corrected, the protection
function activates the moment the power relay is turned on to shut off the power relay.
The display will not light.)
Cause: There is an abnormal current flow to the power amplifier.
Supplementary information: As the current of the power transistor of each channel
is detected, the abnormal channel can be identified by checking the current detect
transistor.
10
RX-V420/RX-V420RDS/HTR-5440/HTR-5440RDS



PS PRT display
(When the power is turned on without this abnormality corrected, the protection
function activates about 1 second later to shut off the power relay. Display may not
light if there is an abnormality with the power supply for the display.)
Cause: There is an abnormality in the power supply section (voltage).
Supplementary information: As the power from the following sources is detected, it
is possible to determine where an abnormality exists.

Main (5): Transformer secondary winding
CB222 (AC voltage)

Input (4): Regulated power supplies
±25, +12A, +12B, -12, +5D

DC PRT display
(When the power is turned on without this abnormality corrected, the protection
function activates about 3 seconds later to shut off the power relay.)
HTR-5440/HTR-5440RDS




Cause: A DC output from the power amplifier of any channel is detected.
RX-V420/RX-V420RDS/




Besides the above possible causes, the cause may be a disconnected connector or around the CPU.
PS PRT and DC PRT displays include the abnormal A/D value in % (voltage value obtained by considering 5V as 100%).
Concerning this value, refer to DIAG menu No.11 AD DATA CHECK.

· Protection history
When the protection function has activated, its history is stored in memory with a memory backup. Even when no
abnormality is noted while the unit is being serviced, an abnormality which has occurred previously can be defined as
long as the backup data has been stored. The protection history should always be cleared before returning the unit
from service.
The protection history is cleared when DIAG is cancelled by selecting "RSRV" (Memory initialization) from the setting
items of the DIAG menu No.10 PRESET or when the backup data is erased.



· Operation procedure of DIAG menu and SUB-MENU
PROGRAM
There are 14 MENU items and some SUB-MENU items as well.

DIAG menu selection
DIAG menu selection
Main unit: Select the menu using (Forward) and § (Reverse) keys of
PRESET/TUNING
PROGRAM.
Remote control unit: Select the menu using (Forward) and (Reverse) keys.
SUB-MENU selection
SUB-MENU selection
Main unit: Select the sub-menu using (Forward) and § (Reverse) keys of
PRESET/TUNING.
Use these keys for
Remote control unit: Select the sub-menu using (Forward) and (Reverse)
DIAG menu selection.
keys.

* Only the remote control keys indicated in the MENU List can be used to select
a sub-menu directly.


Use these keys for
· Functions available during DIAG SUB-MENU selection.
In addition to the DIAG menu, functions as listed below are available.
· Input selection, 6CH input
· Center/Rear/Sub-woofer level adjustment
· Muting
· Power on/off operation

* Functions related to the tuner and the set menu are not available.
* It is possible to confirm Menu No.12 "IF STATUS" while keeping the signal process (operation status) of each DIAG menu
by using the INPUT MODE key of the main unit.
11
RX-V420/RX-V420RDS/HTR-5440/HTR-5440RDS



· Initial settings used to start DIAG function
Following initial settings are used when starting the DIAG function.
When the DIAG function is canceled, the settings before starting DIAG will be restored.

· Input : DVD (6CH INPUT OFF)
· Center/Rear/Sub-woofer level : 0dB
· Audio mute : OFF
· Speaker settings
MAIN, CENTER, REAR : LARGE
BASS OUT : BOTH
MAIN LEVEL : Normal (0dB)
· DIAG menu : DSP THROUGH (1. ANALOG BYPASS)



· Details of DIAG menu

1. DSP THROUGH




HTR-5440/HTR-5440RDS
RX-V420/RX-V420RDS/
There are 5 sub-menu