Denon DN-F650R User manual

SERVICE MANUAL
D&M Holdings Inc.
Copyright 2010 D&M Holdings Inc. All rights reserved.
WARNING: Violators will be prosecuted to the maximum extent possible.
MODEL JP E3 E2 EK EA E1 E1K E1C
DN-F650R
P P
SOLID STATE/USB RECORDER
Ver. 2
•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.
S0103-1V02DM/DG1007
Please refer to the
MODIFICATION NOTICE.

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.
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 fingers
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
1MΩor 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, fires
or other dangerous situations.
CAUTION Concerning important safety
parts

3
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

4
TECHNICAL SPECIFICATIONS
nDigital audio system
• System SOLID STATE/USB RECORDER
• Compatible recording media
SD/SDHC card, USB flash
memory, external USB recording
media
• Recording format
MP3 MPEG1 Layer III audio
compression
WAV 16/24-bit linear PCM
• Recording MP3 bitrate (selectable)
MONO 160, 128, 96, 64, 32 kbps
STEREO 320, 256, 192, 128, 64 kbps
Sampling frequency 96 kHz, (PCM recording only),
48, 44.1 kHz
• Number of channels 2 (STEREO)1 (MONO)
• Audio frequency characteristics 20 – 40,000Hz ± 1.0 dB
(Fs=96kHz)
• S/N ratio, IEC-A filter 96 dB(0dBFS
During playback at 1 kHz)
• Total harmonic distortion (at 0
VU (PCM))
0.01 %
(AES-17 20kHz filter)
• Dynamic range 96 dB
• Variable pitch width -40% – +20%
nInput
• Balanced in L/R
Type XLR (1:GND, 2:Hot, 3:Cold)
Input sensitivity +24 dBu,+20 dBu,+18 dBu,0
dBu / 20 kΩ (0dBFS Reference)
• Line in L/R
Type RCA terminal
Input sensitivity 500 mVrms/24 kΩ
• Unbalanced digital in
Type RCA terminal
Input impedance 75 Ω
Standard input level 0.5 Vp-p
Format IEC-60958 (SPDIF)
• Balanced digital in
Type XLR (1:GND, 2:Hot, 3:Cold)
Input impedance 110 Ω
Standard input level 3.5 Vp-p
Format IEC-60958 (AES/EBU)
nOutput
• Balanced out L/R
Type XLR (1:GND, 2:Hot, 3:Cold)
Maximum level
+24 dBu / 22 Ω (0dBFS Reference)
Load impedance 600
• Unbalanced line out L/R
Type RCA terminal
Standard level 2 Vrms / 300 kΩ
Load impedance
10k
• Balanced digital out
Type XLR (1:GND, 2:Hot, 3:Cold)
Output impedance 110 Ω
Standard output level 3.5 Vp-p
Format IEC-60958 (AES/EBU)
• Unbalanced digital out
Type RCA terminal
Output impedance 75 Ω
Standard output level 0.5 Vp-p
Format IEC-60958 (SPDIF)
• Headphone out 20 mW/32 Ω
nGeneral
• Power supply
U.S.A. and Canada models: AC 120 V, 60 Hz
European,U.K. and Asia/
Pacific models:
AC 230 V, 50 Hz
• Power consumption 22 W
• Environmental conditions
Operating temperature 5 – 35 °C
Operating humidity 25 – 85%, No condensation
Storage temperature –20 – 60°C
nDimensions (including protruding parts)
Width 483 mm
Height 52 mm
Depth 342 mm
Weight 3.7 kg
nOthers
• Maximum capacity of
recording media
Theoretically, no limit up to 2TB.
• Maximum file size 4GB
• Maximum number of files 999 files per folder
• Maximum number of folders 32 folders
• Maximum number of layers
(number of hierarchical levels)
1 (immediately under the root
folder)
• Maximum number of marks 30 marks
• Maximum number of
characters for a file name
255 characters
• Maximum number of
characters for a folder name
255 characters
• Maximum number of
characters for preset names
8 characters
• Maximum number of
characters for a machine ID
8 characters

5
DIMENSION
325.0 mm
10.0 mm 7.0 mm
483.0 mm
483.0 mm
8.0 mm
52.0 mm

6
DISASSEMBLY
• Disassemble in order of the arrow of the figure of following flow.
• In the case of the re-assembling, assemble it in order of the reverse of the following flow.
• 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 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"
HP JACK UNIT
(Ref. No. of EXPLODED VIEW : P1-4)
JOG UNIT
(Ref. No. of EXPLODED VIEW : P1-5)
STB LED UNIT
(Ref. No. of EXPLODED VIEW : P1-6)
PANEL MAIN UNIT
(Ref. No. of EXPLODED VIEW : P2-2)
PANEL SUB UNIT
(Ref. No. of EXPLODED VIEW : P2-3)
MAIN UNIT
Refer to "DISASSEMBLY
2. MAIN UNIT ASSY"
and "EXPLODED VIEW"
MAIN UNIT
(Ref. No. of EXPLODED VIEW : P2-1)
TOP COVER
I/O A UNIT
Refer to "DISASSEMBLY
4. I/O A UNIT"
and "EXPLODED VIEW"
I/O A UNIT
(Ref. No. of EXPLODED VIEW : P1-1)
POWER UNIT
Refer to "DISASSEMBLY
3. POWER UNIT"
and "EXPLODED VIEW"
POWER UNIT
(Ref. No. of EXPLODED VIEW : P1-3)
I/O B UNIT
Refer to "DISASSEMBLY
5. I/O B UNIT"
and "EXPLODED VIEW"
I/O B UNIT
(Ref. No. of EXPLODED VIEW : P1-2)

7
1. FRONT PANEL ASSY
(1) Remove the screws.
(2) Disconnect the connector wires and FFC cable, then remove the screws.
TOP COVER FRONT PANEL ASSY
→
Proceeding :
View from bottom
CX071
CX031
FFC cable
Please refer to "EXPLODED VIEW" for the disassembly method of each PCB included in FRONT PANEL ASSY.

8
2. MAIN UNIT
(1) Disconnect the connector wires and FFC cable, then remove the screws.
3. POWER UNIT
(1) Disconnect the connector wires, then remove the screws. Disconnect the LINK.
TOP COVER MAIN UNIT
→
Proceeding :
FFC cable
FFC cable
CY061
CY141 CY161
MAIN UNIT
TOP COVER POWER UNIT
→
Proceeding :
CX061
CX031
CX021
LINK
POWER UNIT

9
4. I/O A UNIT
5. I/O B UNIT
TOP COVER I/O A UNIT
→
Proceeding :
Please refer to "EXPLODED VIEW" for the disassembly method of I/O A UNIT.
TOP COVER I/O B UNIT
→
Proceeding :
Please refer to "EXPLODED VIEW" for the disassembly method of I/O B UNIT.

10
SERVICE MODE
Power switch to turn on while pressing both buttons 1/3(PLAY/PAUSE)and DISPLAY at the same time.
The following menus are displayed.
"01 Light Check"
"02 Key Check"
"03 Heat Run"
"04 Factory Def"
The menu is selected with jog wheel.
Press the Jog dial on the selected mode.
Press the 20(STOP/CUE) button, it ends service mode.
(1) 01 Light Check
Press the jog wheel. All dots of the display light. And the following buttons and LED light .
Press the jog wheel again. All lights are turned off.
•REC/M.TRACK button
•PLAY/PAUSE button
•LEVEL LED
•OVER LED
It returns to the menu when the jog wheel is pressed more than one second.
Press the 20(STOP/CUE) button, it ends service mode.
(2) 02 Key Check
"Press Key" is displayed, and it becomes the input waiting of the key that does check. Refer to the following.
KEY DISPLAY
PITCH - fr[PITCH -]
PITCH + fr[PITCH +]
PITCH ON/OFF fr[PITCH]
FILE LIST fr[FILE LST]
DISPLAY fr[DISPLAY]
MARK fr[MARK]
MARK - fr[MARK -]
MARK + fr[MARK +]
6(hold down) fr[RWD]start
6(let go) fr[RWD]stop
7(hold down) fr[FWD]start
7(let go) fr[FWD]stop
REC/M.TRACK fr[REC]
STOP/CUE fr[STOP]
SKIP BACK fr[SKIP BAK]
PLAY/PAUSE fr[ PLY/PAUSE ]
REC LEVEL(adjustment switch) fr[REC LVL]
Jog dial(counterclockwise (c) fr[CCW]
Jog dial(clockwise (x)) fr[CW]
Jog dial(Press) fr[JOG]
Jog dial(hold down) ※1 fr[JOG CNCL]
(b1 : It returns to the menu after indication.)

11
(3) 03 Heat Run
The SD file of cards is played.
Turn off the power switch and end.
(4) 04 Factory Def
The memory is initialized. It is assumed the state of the factory shipment.
"Default?"
"[Yes] [No]"
Rotate the jog wheel to select "Yes" ,and press jog wheel.
"Saving..."
Completed
It ends service mode.

12
ABOUT REPLACE THE MICROPROCESSOR WITH A NEW ONE
When replaced of the U-PRO (Microprocessor) or the Flash ROM, confirm contents of the following.
PWB Name Ref. No. Description After
replaced Remark
MAIN IC501 M29W640GB70NA6E B
I/O POWER IC306 UPD78F9222(DNF650R) A
After replaced
A: Mask ROM (With software). No need write-in of software to the microprocessor.
B: Flash ROM (With software). Usually, no need write-in of software. But, when the software was updated, you should be
write-in of the new software to the microprocessor or flash ROM. Please check the software version.
C: Empty Flash ROM (Without software). You should be write-in of the software to the microprocessor or flash ROM.
Refer to "Update procedure" or "writing procedure", when you should be write-in the software.
VERSION UPGRADE PROCEDURE OF FIRMWARE
Use the procedure described below to update the firmware to a newer version.
(1) IInsert the recording media( SD card or USB device) that has the update file' DN-F650Rup.bin ' on the root.
bThe update must use the recording media formatted with FAT16 and FAT32.
(2) The recording media is inserted and the power switch is turned on. The following are displayed.
"Update A-X.XX? [Yes] [No]"
bConfirm the updated version number A-X.XX".
(3) Rotate the jog wheel to select "Yes", and press jog wheel. The following displays blink.
"Executing…"
bThe update of software takes about 1 minute.
(4) When update has completed, the system automatically restarts. The following are displayed.
"Update A-X.XX? [Yes] [No]"
(5) Rotate the jog wheel to select "No" ,and press jog wheel. It returns to the menu. The power switch is turned off.
(6) Return to the factory default settings in Service mode.
[Confirmation of the Firmware version]
(7) To check the current main unit version, Press the DIPLAY button more than 1 second.
At this time, the menu list is displayed in the display sction.
(8) Turn the jog wheel to select "05 F/W Version". If the jog wheel is pressed, the current version
b(A-X.XX) is displayed in the display section.
(9) Press the
2(STOP) button to exit the menu mode.
NOTE:
Please DO NOT touch and DO NOT disconnect power while the unit is being updated.
If the power is turned off accidentally while the unit is being updated, the DN-F650R may not start up.

13
TROUBLE SHOOTING
1. MAIN PWB UNIT
1.1. Reset is not cancelled
Check power supply turning on and the reset timing.
b+3.3V_CPU and u-com reset : 200ms or more
b
u-com reset[TPF506] > System reset[PRST#]
Check VBUS power supply.
• [TPF135] VBUS : +5V
Check USB multiplexer.
• [IC105] signal line.
Check soldering.
•[IC404]
•[IC403]
•[TR501,TR502] and surrounding circuits.
•[C584]
Check part.
• VBUS line constant.
• [IC103]
Check part.
• [IC105] and the surrounding constant.
Check operation of Flash ROM.
bCheck whether the Flash ROM address bus and
the data bus operate.
[IC501] : Check power supply and the control signal.
•+3.3V_CPU (IC 501_37pin)
•PRST# (IC501_12pin)
•SHRD#(IC501_28pin)
•CS0 (IC501_26pin)
bReplace IC501.
Replace MAIN UNIT.
Replace MAIN UNIT.
Replace MAIN UNIT.
1.2. USB keyboard does not operate
1.3. USB drive does not operate
Check operation of USB_HID.
• [TPF136] VBUS : +5V
Check part.
• [IC104] and the surrounding constant.
bReplace IC104.
N.G.
N.G.
N.G.
O.K.
O.K.
N.G.
N.G.
O.K.
O.K.
O.K.

14
Check VBUS power supply turning on.
• [TPF107]
Check power supply for the SD card.
• [TPF124] +3.3V
Check power supply for OLED.
• [TPF732] +3.3VD
• [TPF760] +15V
Check OLED control signal.
• [IC701] 3pin,6pin
• [IC702] 3pin,6pin
• [IC505] 8pin
Check USB multiplexer.
• [IC105] signal line
Check u-com communication line.
Check part.
• [TR102,TR103] and the surrounding constant.
bCheck external VBUS input.
Check part.
• [IC106] and the surrounding constant.
Check output of the power supply.
• [IC109] and the surrounding constant.
• [IC312] and the surrounding constant.
• [TR701,TR702] and the surrounding constant.
Check part.
• [IC701,IC702] and the surrounding constant.
・[IC505]
Check part.
• [IC105] and the surrounding constant.
Check communication line with the main u-com.
• Dumping resistance.
Replace MAIN UNIT.
Replace MAIN UNIT.
Replace OLED.
1.4. USB DEVICE(PC) does not operate
1.5. SD card is not recognized
1.6. DISPLAY does not display
N.G.
N.G.
N.G.
N.G.
N.G.
N.G.
O.K.
O.K.
O.K.
O.K.
O.K.
O.K.

15
Check FUSE condition.
• FUSE [F700]
Check ICP condition.
• ICPN50 [IC304]
Check IC input capacitor of the secondary power
supply.
• [C330]
• [C328]
• [C319]
• [C333]
and other circuits.
2. POWER PWB
2.1. The power cannot be turned on
Check +5V output.
• [CX161] 2,3pin
bNormally : +5V
Check ±18V output.
• [TPF604] +18V
• [TPF605]-18V
Check +15V output.
• [CX161] 13,14pin
bNormally : +15V
Check -15V output.
• [CX161]15pin
bNormally : -15V
Check parts (surrounding) and soldering.
• [IC307]
• [L308]
• [C348]
and other circuits.
Check parts (surrounding) and soldering.
• [IC303]
• [TR306,TR307]
• [L304,L305]
• [L306,L307]
and other circuits.
Check parts (surrounding) and soldering.
• [IC312]
• [C357]
• [IC310]
• [C355]
and other circuits.
Check parts (surrounding) and soldering.
• [IC311]
• [C357]
and other circuits.
Check +3VU output.
• [CX161] 1pin
bNormally : +3.3V
Check parts (surrounding) and soldering.
• [IC802]
• [C332]
and other circuits.
Defect of primary circuit component.
• [D302]
• [D304]
• [IC301]
• [IC302]
• [D303]
• [T301]
and other circuits.
END
N.G.
N.G.
N.G.
N.G.
N.G.
N.G.
N.G.
O.K.
O.K.
O.K.
O.K.
O.K.
O.K.
O.K.

16
Check CODEC output.
• [IC405]38.39.40.41pin
bWhen setting Fs Ref = +24dB, 1kHz 0dBFS
playback and 1Vrms.
Check output from MAIN UNIT to AUDIO UNIT.
bBal : [TPF207,TPF208] 2Vrms
bUnbal : [TPF210,TPF211] 2Vrms
bHP : [TPF203,TPF205] 0.8Vrms
Check cancellation of MUTE.
bCancellation of MUTE : [TPF603] H→L
Check parts (surrounding) and soldering.
• [IC405]
and other circuits.
Check parts (surrounding) and soldering.
MAIN UNIT
• [IC204]
• [IC205]
AUDIO UNIT
• [IC101]
• [IC102]
• [IC801]
• [VR801]
and other circuits.
Check parts (surrounding) and soldering.
MAIN UNIT
• [IC505] 1pin
• [IC401,IC403]
• [TR402,TR403,TR404]
AUDIO UNIT
• Each system MUTE transistor
• [RL101,RL102]
and other circuits.
N.G.
N.G.
N.G.
3. AUDIO UNIT(Analog )
3.1. Analog audio doesn't output
(1) MAIN UNIT
(2) AUDIO UNIT
END
O.K.
O.K.
O.K.

17
Check input level to first stage amp.
bWhen setting Fs Ref=24dB at the reference input
level :
Bal : [IC202,IC203 input] 0.775Vrms
Unbal : [IC204 input] 0.5Vrms
Check level from first stage amp to the Unbal
conversion.
bRefer to LAEVEL DIAGRAM .
Check operation of an analog switch.
bBal/Unbal switch
• [IC202,IC203]
Low →Bal
Hi →Unbal
bStereo/Mono switch
• [IC207]9pin
Low →Stereo
Hi →Mono((L+R)/2)
Check operation of the electronic volume.
bElectronic volume level
• [IC209]9pin,10pin
When 1kHz 0dBFS is input
1.0Vrms
Check operation of the input selector.
bManual/ALC switch
• [IC211]10pin
Low →Manual
Hi →ALC
Check parts (surrounding) and soldering.
Bal : First stage πtype ATT constant
Unbal : [IC204] constant to input
and other circuits.
Check parts (surrounding) and soldering.
• [IC202,IC203]
• [IC204]
• [TR201-TR211]
• [IC205]
and other circuits.
Check parts (surrounding) and soldering.
• [TR201,TR202,TR203]
• [IC203,IC207]
and other circuits.
Check parts (surrounding) and soldering.
• [IC208]
• [IC209]
bFactory default
and other circuits.
Check parts (surrounding) and soldering.
• [IC211]
• [TR208]
and other circuits.
N.G.
N.G.
N.G.
N.G.
N.G.
3.2. Analog audio doesn't input
(1) AUDIO UNIT
(2) MAIN UNIT
Replace MAIN UNIT.
O.K.
O.K.
O.K.
O.K.
O.K.

18
Check IC for the AES/EBU output.
• [IC406]
Check CODEC output.
• [IC405]23pin
Check differential driver input.
• [IC105]
Check differential driver IC.
• [IC105]
Check Unbuffered.
• [IC106]
Check CODEC input.
• [IC405]5pin
Check constants of parts in the surrounding.
• [IC406]
Check part surrounding.
• [IC405]
• [R453]
Check part surrounding.
• [IC105]
Check constants of parts in the surrounding.
• [IC105]
Check part surrounding.
• [IC106]
Check part surrounding.
• [IC405]
N.G.
N.G.
N.G.
N.G.
N.G.
N.G.
4. AUDIO UNIT(Digital)
4.1. AES/EBU doesn't output
(1) MAIN UNIT
(1) MAIN UNIT
(1) AUDIO UNIT
(2) AUDIO UNIT
(2) AUDIO UNIT
(2) MAIN UNIT
END
END
END
4.2. S/PDIF doesn't output
4.3. AES/EBU doesn't input
O.K.
O.K.
O.K.
O.K.
O.K.
O.K.

19
Check Unbuffered.
• [IC106]
Check schmitt trigger.
• [IC107]
Check CODEC input.
• [IC405]4pin
Check part surrounding.
• [IC106]
Check part surrounding.
• [IC107]
Check part surrounding.
• [IC405]
N.G.
N.G.
N.G.
(1) AUDIO UNIT
END
4.4. S/PDIF doesn't input
O.K.
O.K.
O.K.

20
Personal notes: