Marantz Slim-line NR1601 User manual

Service
Manual
•Some illustrations using in this service manual are slightly different from the actual set.
•Please use this service manual with referring to the operating instructions without fail.
•For purposes of improvement, specications and design are subject to change without notice.
Integrated Amplier
NR1601 /N1SG/N1B/U1B
NR1601
S0381-0V04DM/DG1110 Copyright 2011 D&M Holdings Inc. All rights reserved.
WARNING: Violators will be prosecuted to the maximum extent possible.
Ver. 4
Please refer to the
MODIFICATION NOTICE.

2
MARANTZ DESIGN AND SERVICE
Using superior design and selected high grade components, marantz company has created the ultimate in stereo sound.
Only original marantz parts can insure that your marantz product will continue to perform to the specications for which it
is famous.
Parts for your marantz equipment are generally available to our National Marantz Subsidiary or Agent.
ORDERING PARTS :
Parts can be ordered either by mail or by Fax.. In both cases, the correct part number has to be specied.
The following information must be supplied to eliminate delays in processing your order :
1. Complete address
2. Complete part numbers and quantities required
3. Description of parts
4. Model number for which part is required
5. Way of shipment
6. Signature : any order form or Fax. must be signed, otherwise such part order will be considered as null and void.
In case of difculties, do not hesitate to contact the Technical
Department at above mentioned address.
091105DM/DG
USA
MARANTZ AMERICA, INC
100 CORPORATE DRIVE
MAHWAH, NEW JERSEY 07430
USA
EUROPE / TRADING
D&M EUROPE B. V.
P. O. BOX 8744, BUILDING SILVERPOINT
BEEMDSTRAAT 11, 5653 MA EINDHOVEN
THE NETHERLANDS
PHONE : +31 - 40 - 2507844
FAX : +31 - 40 - 2507860
KOREA
D&M SALES AND MARKETING KOREA LTD.
2F,YEON BLDG.,
88-5, BANPO-DONG, SEOCHO-GU,
SEOUL KOREA
PHONE : +82 - 2 - 715 - 9041
FAX : +82 - 2 - 715 - 9040
CANADA
D&M Canada Inc.
5-505 APPLE CREEK BLVD.
MARKHAM, ONTARIO L3R 5B1
CANADA
PHONE : 905 - 415 - 9292
FAX : 905 - 475 - 4159
JAPAN
D&M BUILDING, 2-1 NISSHIN-CHO,
KAWASAKI-KU, KAWASAKI-SHI,
KANAGAWA, 210-8569 JAPAN
D&M Holdings Inc.
CHINA
D&M SALES AND MARKETING SHANGHAI LTD.
ROOM.808 SHANGHAI AIRPORT CITY TERMINAL
NO.1600 NANJING (WEST) ROAD, SHANGHAI,
CHINA. 200040
TEL : 021 - 6248 - 5151
FAX : 021 - 6248 - 4434
SHOCK, FIRE HAZARD SERVICE TEST :
CAUTION : After servicing this appliance and prior to returning to customer, measure the resistance between either primary
AC cord connector pins (with unit NOT connected to AC mains and its Power switch ON), and the face or Front Panel of
product and controls and chassis bottom.
Any resistance measurement less than 1 Megohms should cause unit to be repaired or corrected before AC power is applied,
and veried before it is return to the user/customer.
Ref. UL Standard No. 60065.
NOTE ON SAFETY :
Symbol zFire or electrical shock hazard. Only original parts should be used to replaced any part marked with symbol z.
Any other component substitution (other than original type), may increase risk of re or electrical shock hazard.
安全上の注意：
zがついている部品は、安全上重要な部品です。必ず指定されている部品番号の部品を使用して下さい。

3
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.
Be sure to test for leakage current with the AC plug in both polarities, in addition, in each power ON, OFF and STANDBY
mode, if applicable.
CAUTION Please heed the points listed below during servicing and inspection.
◎Heed the cautions!
Spots requiring particular attention when servicing, such
as the cabinet, parts, chassis,etc., have cautions indicated
on labels. be sure to heed these causions and the
cautions indicated in the handling instructions.
◎Caution concerning electric shock!
(1) An AC voltage is impressed on this set, so touching
internal metal parts when the set is energized could
cause electric shock. Take care to avoid electric
shock, by for example using an isolating transformer
and gloves when servicing while the set is energized,
unplugging the power cord when replacing parts, etc.
(2) Tere are high voltage parts inside. Handle with extra
care when the set is energized.
◎Caution concerning disassembly and
assembly!
Through great care is taken when manufacturing parts
from sheet metal, there may in some rare cases be burrs
on the edges of parts which could cause injury if ngers
are moved across them. Use gloves to protect your hands.
◎Only use designated parts!
The set's parts have specific safety properties (fire
resistance, voltage resistance, etc.). For replacement
parts, be sure to use parts which have the same
poroperties. In particular, for the important safety parts
that are marked z on wiring diagrams and parts lists, be
sure to use the designated parts.
◎Be sure to mount parts and arrange the wires
as they were originally!
For safety seasons, some parts use tape, tubes or other
insulating materials, and some parts are mounted away
from the surface of printed circuit boards. Care is also
taken with the positions of the wores omsode amd clamps
are used to keep wires away from heating and high
voltage parts, so be sure to set everything back as it was
originally.
◎Inspect for safety after servicing!
Check that all screws, parts and wires removed or
disconnected for servicing have been put back in their
original positions, inspect that no parts around the area
that has been serviced have been negatively affected,
conduct an inslation check on the external metal
connectors and between the blades of the power plug,
and otherwise check that safety is ensured.
(Insulation check procedure)
Unplug the power cord from the power outlet, disconnect
the antenna, plugs, etc., and turn the power switch on.
Using a 500V insulation resistance tester, check that the
inplug and the externally exposed metal parts (antenna
terminal, headphones terminal, input terminal, etc.) is
1MΩ or greater. If it is less, the set must be inspected and
repaired.
Many of the electric and structural parts used in the set
have special safety properties. In most cases these
properties are difficult to distinguish by sight, and using
replacement parts with higher ratings (rated power and
withstand voltage) does not necessarily guarantee that
safety performance will be poreserved. Parts with safety
properties are indicated as shown below on the wiring
diagrams and parts lists is this service manual. Be sure to
replace them with parts with the designated part number.
(1) Schematic diagrams ......Indicated by the z mark.
(2) Parts lists ......Indicated by the zmark.
Using parts other than the designated
parts could result in electric shock, res
or other dangerous situations.
CAUTION Concerning important safety
parts

4
NOTE FOR SCHEMATIC DIAGRAM
WARNING:
Parts marked with this symbol zhave critical characteristics. Use ONLY replacement parts recommended by the manufacturer.
CAUTION:
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.
WARNING:
DO NOT return the unit to the customer until the problem is located and corrected.
NOTICE:
ALL RESISTANCE VALUES IN OHM. k=1,000 OHM / M=1,000,000 OHM
ALL CAPACITANCE VALUES IN MICRO FARAD. P=MICRO-MICRO FARAD EACH VOLTAGE AND CURRENT ARE MEASURED AT NO SIGNAL
INPUT CONDITION. CIRCUIT AND PARTS ARE SUBJECT TO CHANGE WITHOUT PRIOR NOTICE.
Parts for which "nsp" is indicated on this table cannot be supplied.
When ordering of part, clearly indicate "1" and "I" (i) to avoid mis-supplying.
Ordering part without stating its part number can not be supplied.
Not including General-purpose Carbon Chip Resistor in the P.W.Board parts list. (Refer to the Schematic Diagram for those parts.)
Parts marked with this symbol zhave critical characteristics. Use ONLY replacement parts recommended by the manufacturer.
Not including General-purpose Carbon Film Resistor in the P.W.Board parts list. (Refer to the Schematic Diagram for those parts.)
Part indicated with the mark "★" is not illustrated in the exploded view.
WARNING:
1.
2.
3.
4.
5.
6.
●Resistors
RD : Carbon
RC : Composition
RS : Metal oxide film
RW: winding
RN : Metal film
RK : Metal mixture
P : Pulse-resistant type
NL : Low noise type
NB : Non-burning type
FR : Fuse-resistor
F : Lead wire forming
2B : 1/8 W
2E : 1/4 W
2H : 1/2 W
3A : 1 W
3D : 2 W
3F : 3 W
3H : 5 W
F:±1%
G:±2%
J:±5%
K:±10%
M:±20%
Ex.: RN
Type
14K
Shape
and per-
formance
2E
Power
182
Resist-
ance
G
Allowable
error
FR
Others
*Resistance
1800ohm=1.8kohm1 8 2
Indicates number of zeros after effective number.
2-digit effective number.
1.2ohm1 R 2
2-digit effective number, decimal point indicated by R.
1-digit effective number.
: Units: ohm
●Capacitors
CE : Aluminum foil
electrolytic
CA : Aluminium solid
electrolytic
CS : Tantalum electrolytic
CQ: Film
CK : Ceramic
CC : Ceramic
CP : Oil
CM: Mica
CF : Metallized
CH : Metallized
HS : High stability type
BP : Non-polar type
HR : Ripple-resistant type
DL : For change and discharge
HF : For assuring high requency
U : UL part
C : CSA part
W : UL-CSA part
F : Lead wire forming
0J : 6.3 V
1A : 10 V
1C : 16 V
1E : 25 V
1V : 35 V
1H : 50 V
2A : 100 V
2B : 125 V
2C : 160 V
2D : 200 V
2E : 250 V
2H : 500 V
2J : 630 V
F:±1%
G:±2%
J:±5%
K:±10%
M:±20%
Z:±80%
:-20%
P : +100%
C:±0.25pF
D:±0.5pF
= : Others
Ex.: CE
Type
04W
Shape
and per-
formance
1H
Dielectric
strength
3R2
Capacity
M
Allowable
error
BP
Others
･Units:μF.
2200μF2 2 2
Indicates number of zeros after effective number.
2-digit effective number. ･Units:μF.
2.2μF2 R 2
2-digit effective number, decimal point indicated by R
1-digit effective number.
*Capacity (electrolyte only)
･When the dielectric strength is indicated in AC,"AC" is included after the dieelectric strength value.
*Capacity (except electrolyte)
･Units:pF
2200pF=0.0022μF2 2 2
Indicates number of zeros after efective number. (More than 2)
2-digit effective number. ･Units:pF
220pF2 2 1
2-digit effective number.
Indicates number of zeros after effective numver. (0 or 1)
NOTE FOR PARTS LIST

5
19.5 52
225
19.0
53.5
225.0
367
22.5
328.5
16
27.6
340
440
14.5
95.8
90.5
105
TECHNICAL SPECIFICATIONS
nAudio Section
•Power amplifier
Rated output :
Front:
50W+50W(8Ω,20Hz–20kHzwith0.08%T.H.D.)
75W+75W(6Ω,1kHzwith10%T.H.D.)
Center:
50W(8Ω,20Hz–20kHzwith0.08%T.H.D.)
75W(6Ω,1kHzwith10%T.H.D.)
Surround:
50W+50W(8Ω,20Hz–20kHzwith0.08%T.H.D.)
75W+75W(6Ω,1kHzwith10%T.H.D.)
SurroundBack:
50W+50W(8Ω,20Hz–20kHzwith0.08%T.H.D.)
75W+75W(6Ω,1kHzwith10%T.H.D.)
Output connectors : 6–8Ω
•Analog
Input sensitivity/Input impedance : 130mV/50kΩ
Frequency response: 10Hz–100kHz—±3dB(SourceDirectmode)
S/N : 98dB(IHF–Aweighted,DIRECTmode)
nVideo Section
•Standard video connectors
Input/output level and impedance : 1Vp-p,75Ω
Frequency response : 5Hz–10MHz—+1,–3dB
•Standard video connectors
Input/output level and impedance :
Y(brightness)signal—1Vp-p,75Ω
PB/CBsignal—0.7Vp-p,75Ω
PR/CRsignal—0.7Vp-p,75Ω
Frequency response : 5Hz–60MHz—+0,–3dB
nTuner section
[FM](Note:μVat75Ω,0dBf=1x10–15W)
Receiving Range (forU):
[FM] 87.5MHz–107.9MHz [AM]520kHz–1710kHz
Receiving Range (forN):
[FM] 87.5MHz–108.0MHz [AM]522kHz–1611kHz
Usable Sensitivity :
[FM]1.2μV(12.8dBf) [AM]18μV
50 dB Quieting Sensitivity (forU):
[FM]MONO2.8μV(20.2dBf)
50 dB Quieting Sensitivity (forN):
[FM]MONO2.0μV(17.3dBf)
STEREO42μV(34.5dBf)
S/N (IHF-A) :
[FM]MONO70dB
STEREO67dB
Total harmonic Distortion (at 1 kHz) (forU):
[FM]MONO0.7%
STEREO1.0%
Total harmonic Distortion (at 1 kHz) (forN):
[FM]MONO0.3%
STEREO0.7%
nGeneral
Power supply(forU) : AC120V,60Hz
Power supply(forN) : AC230V,50Hz
Power consumption :
250W
0.2W(Standby)
3W(CECstandby)
Maximum external dimensions :
440(W)x105(H)x367(D)mm
Weight : 9.0kg
nRemote Control Unit (RC010SR)
Batteries : R03/AAAType(twobatteries)
DIMENSION

6
CAUTION IN SERVICING
Initializing AV SURROUND RECEIVER
AV SURROUND RECEIVER initialization should be performed when the μcom, peripheral parts of μcom, and Digital
P.W.B. are replaced.
1. Turn off the power using ON/STANDBY button.
2. Press ON/STANDBY button while simultaneously pressing ENTER and RETURN buttons.
3. Check that the entire display is ashing with an interval of about 1 second, and release your ngers from the 2
buttons and the microprocessor will be initialized.
Service Jigs
When you repair the printing board, you can use the following JIG (Extension cable kit).
Please order to marantz Ofcial Service Distributor in your region if necessary.
8U-110084S : EXTENSION UNIT KIT : 1 Set
(Refer to "JIG FOR SERVICING".)
When you update the rmware, you can use the following
JIG (RS232C to internal connector conversion adapter with 4P FFC cable kit ).
Please order to marantz Ofcial Service Distributor in your region if necessary.
8U-210100S : WRITING KIT : 1 Set
(Refer to "VERSION UPGRADE PROCEDURE OF FIRMWARE".)
Note: •If step 3 does not work, start over from step 1.
• All user settings will be lost and this factory setting will be recovered when this initialization mode.
So make sure to memorize your setting for restoring after the initialization.
ON/STANDBY ENTER RETURN

7
DISASSEMBLY
• Disassembleinorderofthearrowofthegureoffollowingow.
• Inthecaseofthere-assembling,assembleitinorderofthereverseofthefollowingow.
• Inthecaseofthere-assembling,observe"attentionofassembling"it.
• Ifwirebundlesareuntiedormovedtoperformadjustmentorpartsreplacementetc.,besuretorearrangethemneatly
astheywereoriginallybundledorplacedafterward.
Otherwise,incorrectarrangementcanbeacauseofnoisegeneration.
About the photos used for descriptions in the "DISASSEMBLY" section.
• Thedirectionfromwhichthephotographsusedhereinwerephotographedisindicatedat"Directionofphotograph:***"
attheleftoftherespectivephotographs.
• Refertothetablebelowforadescriptionofthedirectioninwhichthephotosweretaken.
• Photographsforwhichnodirectionisindicatedweretakenfromabovetheproduct.
• ThePhotographsisNR1601N1Bmodel.
The viewpoint of each photograph
(Photografy direction)
［View from above］
Front side
Direction of photograph: B
Direction of photograph: D
Direction of photograph: C
Direction of photograph: A
FRONT PANEL ASSY
Referto "DISASSEMBLY
1. FRONT PANEL ASSY"
and"EXPLODED VIEW"
PCBH/P
(Ref.No.ofEXPLODEDVIEW:11)
PCBUSB
(Ref.No.ofEXPLODEDVIEW:16)
PCBFRONT
(Ref.No.ofEXPLODEDVIEW:26)
RADIATOR ASSY
Referto "DISASSEMBLY
2. RADIATOR ASSY"
and"EXPLODED VIEW"
PCBGUIDE_L
(Ref.No.ofEXPLODEDVIEW:20)
PCB7CH_AMPASSY
(Ref.No.ofEXPLODEDVIEW:25)
PCBGUIDE_H/S
(Ref.No.ofEXPLODEDVIEW:29)
PCBGUIDE_R
(Ref.No.ofEXPLODEDVIEW:30)
PCB REG CNT/PCB REG
Referto "DISASSEMBLY
3. PCB REG CNT/PCB REG"
and"EXPLODED VIEW"
PCBREG
(Ref.No.ofEXPLODEDVIEW:44)
PCBREG_CNT
(Ref.No.ofEXPLODEDVIEW:43)
CABINET TOP
HDMI UNIT ASSY
Referto "DISASSEMBLY
4. HDMI UNIT ASSY"
and"EXPLODED VIEW"
PCBFRONT_CNT
(Ref.No.ofEXPLODEDVIEW:45)
PCBSIDE_CNT
(Ref.No.ofEXPLODEDVIEW:47)
PCBAUDIO_VIDEOASSY
(Ref.No.ofEXPLODEDVIEW:48)
PCBHDMIASSY
(Ref.No.ofEXPLODEDVIEW:49)
PCBRC-5/M-X
(Ref.No.ofEXPLODEDVIEW:50)
PCB SPK/PCB SMPS
Referto "DISASSEMBLY
5. PCB SPK/PCB SMPS"
and"EXPLODED VIEW"
PCBSPK
(Ref.No.ofEXPLODEDVIEW:42)
PCBSMPS
(Ref.No.ofEXPLODEDVIEW:41)

8
1. FRONT PANEL ASSY
(1) Removethescrews.
(2) Cutthewireclampbands,thenremovethescrews.
CABINET TOP FRONT PANEL ASSY
→
Proceeding :
View from bottom
Direction of
photograph: D
Direction of
photograph: C cut

9
(3) DisconnecttheconnectorwiresandFFCcable.Removethescrews.
2. RADIATOR ASSY
(1) Removethescrews.
CP303
FFC cable
cut
Pleasereferto"EXPLODEDVIEW"forthedisassemblymethodofeachPCBincludedinFRONTPANELASSY.
CABINET TOP FRONT PANEL ASSY
→RADIATOR ASSY →
Proceeding :
View from bottom

10
(2) Removethescrews.
(3) Disconnecttheconnectorwires.
Direction of
photograph: D
Direction of
photograph: C
CP401 CP402
CP403
N2706 CP405
PCB 7CH AMP
STYLE PIN:Loose
RADIATOR ASSY
Pleasereferto"EXPLODEDVIEW"forthedisassemblymethodofeachP.W.BincludedinRADIATORASSY.

11
3. PCB REG CNT/PCB REG
(1) Removethescrews.
(2) Disconnecttheconnectorwiresandconnectorboard.
CABINET TOP FRONT PANEL ASSY
→RADIATOR ASSY →
Proceeding :
PCB REG CNT/PCB REG
→
PCB REG CNTPCB REG
Direction of photograph: C
CP10CP104 PCB REG CNT
Board to board
CP102
CP13APCB REG

12
4. HDMI UNIT ASSY
(1) Cutthewireclampbands,thendisconnecttheconnectorwireandFFCcable.
(2) Removethescrews,thenremovetheBACKPANEL.
(3) RemovethePCBRC-5/M-X.
CABINET TOP HDMI UNIT ASSY
→
Proceeding :
HDMI UNIT ASSY
FFC cable
N2706
N2301 N2501
cut
Direction of photograph: A
Board to board
PCB RC-5/M-X

13
(4) Disconnecttheconnectorboard.
(5) Removethescrews.
(6) Disconnecttheconnectorwires.
PCB HDMI
Board to board
Board to board
Board to board
PCB AUDIO_VIDEO
PCB AUDIO VIDEO PCB FRONT CNT
PCB SIDE CNT CP401CP13A CP10
CN3

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(7) Disconnecttheconnectorboard.
PCB AUDIO VIDEO
PCB FRONT CNTPCB SIDE CNT
Board to board
Board to board
Pleasereferto"EXPLODEDVIEW"forthedisassemblymethodofeachP.W.BincludedinHDMIUNITASSY.

15
5. PCB SPK/PCB SMPS
(1) RemovetheSheet,thenremovethescrewsandSUPPORTERP.C.
(2) Disconnecttheconnectorwire,thenremovethescrews.
CABINET TOP HDMI UNIT ASSY
→PCB SPK/PCB SMPS →
Proceeding :
View from bottom
SUPPORTER P.C. Sheet
Direction of
photograph: D
CX102

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(3) Disconnecttheconnectorwire,thenremovethescrews.RemovethePCBSPK/PCBSMPSfromthemainunit.
(4) Disconnecttheconnectorboard.
CP1
CP405CP403
CP402
PCB SMPSPCB SPK
Board to board

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SPECIAL MODE
Special mode setting button
bPress the ON/STANDBY button to turn on while pressing both buttons A and B at the same time.
Mode Button A Button B Contents
µcom/DSP Version display mode ENTER SURROUND
MODE
Firmware versions such as Main, Sub, DSP are displayed in
the FL manager. Errors are displayed when they occur. (Refer
to 18 page.)
Errors checking mode
(Displaying the protection history)
SURROUND
MODE BAND Displaying the protection history (Refer to 19 page.)
Initialization mode ENTER RETURN Backup data initialization is carried out.
(Refer to 6 page.)
Panel lock mode PURE
DIRECT BAND Operations using main unit panel buttons or master volume are rejected.
Panel lock mode
(Remove Master volume)
PURE
DIRECT DISPLAY Operations using main unit panel buttons are rejected.
Cancellation of panel lock mode PURE
DIRECT RETURN Panel lock mode is cancelled.
bWhen power is turned on, pressing both buttons A and B at the same time for 3 seconds or more.
Mode Button A Button B Contents
Mode for preventing remote control
acceptance
SURROUND
MODE STATUS Operations using remote control are rejected. Select with the CURSOR 01button.
DUAL BACKUP MEMORY (Backup) STATUS ENTER Backup of DUAL BACKUP MEMORY is performed.
(Refer to 21 page.)
DUAL BACKUP MEMORY (Recovery) STATUS MENU Recovery of DUAL BACKUP MEMORY is performed.
(Refer to 21 page.)
DUAL BACKUP MEMORY
(Backup Clear) STATUS AUTO Backup of DUAL BACKUP MEMORY is cleared. (Refer to 21 page.)
ON/STANDBY
CURSOR 0 1
ENTER RETURN PURE DIRECT
SURROUND
MODE
MENU STATUS
BANDDISPLAY
AUTO

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1. µcom/DSP Version display mode
1.1. Operationspecications
µcom/DSP version display mode:
When started up, the version information is displayed.
Starting up:
With the "ENTER" and "SURROUND MODE" buttons pressed, press the "ON/STANDBY" button to turn the power on.
Now, press the "STATUS" button to the display the 2nd item information on the FL Display.
1.2. Display Order
Destination information → Main-µcom version → Main 1st Boot version → Sub-µcom version →
Sub 1st Boot Loader Version → DSP version → APLD version → USB version
1.3. Error display
See the following table for each "Error information" display and its contents (status).
Display order is q,w,e,r,t.
Condition State State
q Sub-μcom NG No response from Sub-μcom
SUB ERROR 01
w DIR NG No response from DIR
DIR ERROR 01
e DSP1 NG
When DSP boot, executing DSP reset makes no change to DSP1 FLAG0
port "H".
DSP ERROR 01
No change to DSP FLAG0 port "H" before issuing DSP command.
DSP ERROR 02
When DSP data read, executing WRITE="L" makes no change to ACK="H".
DSP ERROR 03
When DSP data read, executing REQ="L" makes no change to ACK="L".
DSP ERROR 04
When DSP data write, executing WRITE="H" makes no change to ACK="H".
DSP ERROR 05
When DSP data write, executing REQ="L" makes no change to ACK="L".
DSP ERROR 06
When DSP special code boot, executing DSP reset makes no change to
DSP FLAG0 port "H".
DSP ERROR 11
No change to DSP FLAG0 port "H" before issuing DSP special read
command.
DSP ERROR 12
No change to DSP FLAG0 port "H" before DSP version read.
DSP ERROR 13
r EEPROM NG Error appeared in EEPROM checksum.(*** is a block address number.)
E2PROM ERR***
tBoth SUB/DSP
/EEPROM OK (No error display, version display only)

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2. Errors checking mode (Displaying the protection history)
2.1. Operationspecications
Error mode (Displaying the protection history):
When started up, the error information is displayed.
Starting up:
●Allmodelcommonness
With the "SURROUND MODE" and "BAND" buttons pressed, press the "ON/STANDBY" button to turn the power on. The
error (protection history display) mode is set.
Now, press the "STATUS" button to turn on the FL display.
2.2. About the display on the FL display
When the "STATUS" button is pressed after setting the error (protection history display) mode, a history like the one
shown below is displayed, depending on the conditions.
(1) Normally (when there has been no protection incident)
FLD NO PROTECT
(2) For ASO (when the last protection incident was ASO protection)
FLD PRT:ASO
Cause: The line between speaker terminals is shorted, or use speakers having impedance less than that specied.
Supplementary information: As the excess current is detected after operation of the speaker relay, the shorted
speaker terminal and the connected speaker can be identied.
Turning on the power without correcting the abnormality will cause the protection function to work about 5 seconds
later and the power supply will be shut off.
(3) For DC (when the last protection incident was DC protection)
FLD PRT:DC
Cause: DC output of the power amplier is abnormal.
Turning on the power without correcting the abnormality will cause the protection function to work about 5 seconds
later and the power supply will be shut off.
(4) For THERMAL (when the last protection incident was THERMALprotection)
FLD PRT:THERMAL
Cause: The temperature of the heat sink is excessive.
Turning on the power without correcting the abnormality will cause the protection function to work about 5 seconds
later and the power supply will be shut off.
zAdditional causes of protection can be due to loose connections, associated components, Microprocessor, etc.
When the "STATUS" button is pressed again after the above protection history is displayed, the normal display reappears.

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2.3. Clearing the protection history
There are two ways to clear the protection history, as described below.
(1) Start up the error (protection display) mode, display the error, then press and hold in the "ENTER" button for 3 seconds.
FLD :THERMALTHE
Press and hold in the "ENTER" button for 3 seconds.
FLD PRT:CLEAR
The above is displayed and the protection history is cleared.
FLD NO PROTECT
(2) Initialize. (Refer to "Initializing AV SURROUND RECEIVER" 6 page.)
b If you want to save a backup, use the method in 2.3.(1) above.
Warning indication by the POWER LED
If the power is turned off when a protection incident has been detected, the POWER LED (red) ashes as a warning
according to the conditions in which the protection incident occurred.
(1) ASO/DC PROTECTION : Flashes in cycles of 0.5 seconds (0.25 seconds lit, 0.25 seconds off)
(2) THERMAL PROTECTION : Flashes in cycles of 2 seconds (1 second lit, 1 second off)