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DP-U50




PERSONAL SOUND PROCESSER

DP-U50 SERVICE MANUAL




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




DP-U50
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 DISPLAY DATA ............................................................ 25
FRONT PANEL ............................................................... 2 BLOCK DIAGRAM ................................................ 26 ­ 27
REAR PANELS ............................................................... 2 PRINTED CIRCUIT BOARD ................................. 28 ­ 35
SPECIFICATIONS ........................................................... 3 IC BLOCK ............................................................. 36 ­ 37
INTERNAL VIEW ............................................................ 4 SCHEMATIC DIAGRAM ....................................... 38 ­ 39
DISASSEMBLY PROCEDURES .................................... 4 PARTS LIST .......................................................... 40 ­ 49
SELF DIAGNOSIS FUNCTION ............................... 5 ­ 13 REMOTE CONTROL TRANSMITTER .......................... 50
STANDARD OPERATION CHART .............................. 14 PARTS LIST FOR CARBON RESISTORS .................. 51
IC DATA ................................................................ 15 ­ 24




100736
DP-U50




I TO SERVICE PERSONNEL
1. Critical Components Information
Components having special characteristics are marked Z AC LEAKAGE
and must be replaced with parts having specifications equal WALL EQUIPMENT TESTER OR
to those originally installed. OUTLET UNDER TEST EQUIVALENT

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.



"CAUTION"
"F1 : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 1.0A, 125V FUSE."
A V
CAUTION
F1 : REPLACE WITH SAME TYPE 1.0A, 125V FUSE.

ATTENTION
F1 : UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 1.0A, 125V.




WARNING: CHEMICAL
CONTENT NOTICE!
The solder used in the production of this product
DP-U50




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 REASON
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.




1
DP-U50




I FRONT PANEL




DP-U50
I REAR PANELS

M U, C models M A model M B, G models




2
DP-U50




I SPECIFICATIONS

I AUDIO SECTION I GENERAL

Output Level/Impedance Power Supply
PRE OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.0V/2.0k U, C models . . . . . . . . . . . . . . . . . . . . . . . AC 120V, 60Hz
SUB WOOFER (50Hz) . . . . . . . . . . . . . . . . . . . . . . 2.0V/1.7k A model . . . . . . . . . . . . . . . . . . . . . . . . . . . AC 240V, 50Hz
Input Sensitivity/Impedance B, G models . . . . . . . . . . . . . . . . . . . . . . . AC 230V, 50Hz
PC, AUX 1, AUX 2 (Analog) . . . . . . . . . . . . 150mV/35k Power Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20W
Maximum Input Signal Level Standby Power Consumption . . . . . . . . . . . . . . . . . . . . . 8W
PC, AUX 1, AUX 2, 1kHz (DSP= THRU) . . . . . . . . . 2.1V Dimensions (W x H x D) . . . . . . . . . . . . . 120 x 294 x 355mm
Headphone Jack Rated Output/Impedance (4-11/16" x 11-9/16" x 13-15/16")
PC Analog Input, etc (1kHz, 150mV) . . . . . . 320mV/61 Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.0 kg (11 lbs 3oz)
Frequency Response Finish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Silver color
USB to PRE OUT Accessories . . . . . . . . . . . . Remote Control Transmitter x 1
20Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . -1.0+1.0/-1.0dB Battery (size "AA", "R06") x 2
1kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0dB USB Cable x 1
20kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5+1.0/-1.0dB CD ROM x 1
PC, AUX Digital Input to PRE OUT
* Specifications subject to change without notice.
20Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . -1.0+1.0/-1.0dB
1kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0/-0dB
20kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5+1.0/-1.0dB U . . . . . . . . . . USA model
Total Harmonic Distortion (1kHz, 20k LPF) C . . . . . . Canadian model
USB to PRE OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01% A . . . . . Australian model
PC, AUX Digital Input to PRE OUT . . . . . . . . . . . . . 0.01% B . . . . . . . . British model
Signal-to-Noise Ratio (IHF-A-Network) G . . . . . European model
USB to PRE OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . 100dB
PC, AUX Digital Input to PRE OUT . . . . . . . . . . . . . 110dB
Residual Noise (IHF-A-Network)
PRE OUT L/R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20µV

G DIMENSIONS
120 (4­11/16")




85 (3­5/16")
DP-U50




Manufactured under license from Dolby Laboratories.
"Dolby", "AC-3", "Pro Logic", and the double-D symbol V
are trademarks of Dolby Laboratories. © 1992-1997 Dolby
Laboratories. All rights reserved.
281 (11­1/16")

294 (11­9/16")
253 (9­15/16")




Manufactured under license from Digital Theater Systems,
Inc. US Pat. No. 5,451,942 and other world-wide patents
issued and pending. "DTS", "DTS Digital Surround", are
trademarks of Digital Theater Systems, Inc. copyright
1996 Digital Theater Systems, inc. All rights reserved.


13.5 (1/2")
13 (1/2")




355 (13­15/16")
283 (11­1/8")




Units : mm (inch)


3
DP-U50




I INTERNAL VIEW

q w e r
q DSP P.C.B.
w MAIN P.C.B.
e OPERATION (1) P.C.B.
r OPERATION (2) P.C.B.




I DISASSEMBLY PROCEDURES (Remove parts in the order as numbered.)




DP-U50
1. Removal of Top Cover 2. Removal of Front Panel
Remove 14 screws ( q and w ) and then remove the Remove 6 screws ( e ) and then remove the Front
Top Covers in Fig. 1. Panel in Fig. 2.

3. Checking the DSP P.C.B.
Remove 4 screws ( r ) and then remove the Shield
Case in Fig. 2.



Top Cover
q e



q
e


q Top Cover (L)
w

Front Panel
q
r
Top Cover (R)


q

q r
Shield Case

Fig. 1 Fig. 2
The shield case can be removed only by
loosening these 2 screws marked (r).
4
DP-U50




I SELF DIAGNOSIS FUNCTION
This product has a built-in self diagnosis function (DIAG) that can be used for inspection, measurement and
determination of a faulty point, if any.
There are ten menu items, each of which has a number of sub menu items.
Listed below are these menu items and sub-menu items.
No. Main menu Sub menu No. Main menu Sub menu
1 ALL (Sequential test) 10 DIT (Digital interface) 1. GENERAL
2 DEV (Device test) 2. CD
3 DSP (DSP test) 1. THROUGH 3. PCM Enc
2. DELAY 4. DAT
3. HALL 5. BS JPN
4. JAZZ 6. Synthe
5. CHURCH 7. AD
6. GAME 8. SD
7. MOVIE 9. BS Eur
8. LIVE 10. MIXER
9. PC-ANA 11. SFC
10. PC-Digi 12. DSP
11. AUX1-A 13. L Pa:Ch
12. AUX1-D 14. DIR RV
13. AUX2-A 15. RETURN
14. RETURN 0 EXIT
4 FL (FL test) 1. AUTO
2. MANUAL
3. RETURN
5 AD (AD test) 1. KEY
2. LEVEL
3. JUDGE
4. V-ERR
DP-U50




5. V-MAX
6. V-MID60
7. V-MID55
8. V-MID52
9. V-MID49
10. V-MID29
11. V-MID1
12. V-MIN
13. RETURN
6 USB (USB loop back test) 1.START
2. STOP
3. RETURN
7 INIT (Memory initialization) 1. MEMORY
2. CANCEL
3. RETURN
8 VER (Version information) 1. SHV
2. EGAV
3. ChckSum
4. RETURN
9 ERROR (Error history) 1. E0-
2. E1-
3. E2-
4. E3-
5. E4-
6. E5 -
7. E6-
8. E7-
9. CLEAR
10. RETURN
5
DP-U50



G Starting DIAG
While the opening message appearing at the power ON is on display, press the "DSP" key 3 times; quickly at
the first and second times and keep pressing it at the third time until the DIAG function is started.




G Display when DIAG function is started
First, "DIAG" appears on the FL display of the main unit, followed by the version of the
microcomputer for 1 second (e.g., 1.000f), the checksum of the microcomputer for 2 seconds
(e.g., 7720) and finally the DIAG menu (e.g., 1: ALL). Also, all the function LED segments light
up.

DIAG started
When there is no protection function history (*1)

(*1) When there is a history of the protection function
recorded, the type of the last protection function in the
record appears.

DIAG

Some seconds
later



Version of the microcomputer




DP-U50
1.000f

1 second
later


Checksum of microcomputer




7720

2 seconds
later


DIAG menu




1: ALL

6
DP-U50



When the protection function works and the power is turned off after DIAG was started
When the protection function (*2) works, its history appears in the abbreviated form as described below and
the power turns off. Correct the failure based on the history of the protection function.

(*2) When some abnormality is detected in the power source, etc. the power is forced to turn off by the
protection function.



PT PS display
(Turning on the power without solving the problem causes the protection
function to work at that moment and the power turns off. If the trouble is
in the power supply related to the display, display may disappear.)
Possible cause: An abnormality in the power supply section (voltage)
Supplementary information: As the following power supply is detected,
the faulty point can be identified.

Stabilizing power source
±15A, +9V, +5A, +5D SW, -VP




Besides the above possible causes, the cause may be disconnection of the connector, an error around CPU, etc.



G History of protection
When the protection function has worked, its history is stored in the backup memory. Even if no abnormality is found while servicing,
the abnormality the user experienced can be identified by using the data in the backup memory.
The recorded history of the protection function is cleared when the DIAG function is cancelled by setting DIAG menu No.7 INIT to
"MEMORY" (memory initialization) or when the backup memory is erased.
DP-U50




7
DP-U50




G Operation procedure of DIAG menu and SUB-MENU
1) Use the UP w (forward) / DOWN q (reverse) keys to select a main menu item.
2) In case of main menu items 1. ALL and 2. DEV neither of which has sub menu, the
menu item is executed when the DSP key is pressed.
3) In case of main menu items which have sub menu, the sub menu appears when the
DSP key is pressed.
4) Use the UP w (forward) / DOWN q (reverse) keys to select a sub-menu item.
5) The sub-menu item is executed when the DSP key is pressed.
6) To return from the sub-menu to the main menu, have "RETURN" displayed by using
the UP w (forward) / DOWN q (reverse) keys and press the DSP key.
7) To return to the DIAG initial setting (1.ALL) during DIAG operation, press the MUTE
key except for the special case (*3).

(*3) : It is not possible to return to 1.ALL during execution of the AD test.



When using remote controller

Main unit Remote control key Remote control code
UP w (forward) VOLUME UP w (forward) 7B---0D
DOWN q (reverse) VOLUME DOWN q (reverse) 7B---0E
DSP ON/OFF 7B---07
MUTE --- (operation unavailable) ---




G Functions during DIAG operation
Following functions are available even during the DIAG operation.
· Power ON/OFF




DP-U50
· Master volume




G Canceling DIAG
There are two methods to cancel the DIAG function.
1) Press the "POWER" (STANDBY) key of the main unit or the "POWER" (STANDBY) key of the remote controller to
enter the stand-by state.
2) Selecting the DIAG menu item 0. EXIT, cancel the DIAG function. Then the self-diagnosis process ends and the
normal operation is restored.

CAUTION: Prior to cancellation of the DIAG function, be sure to execute setting of DIAG menu 7. INIT (reserve /
reserve cancel of memory initialization). (To keep the user memory, execute "CANCEL" (cancellation of resetting
reservation) of 7. INIT setting before canceling the DIAG function.)




8
DP-U50




Details of DIAG menu

1. ALL (Sequential test)
This menu is used to execute major five items of the DIAG menu. The items are as follows.
(Set the volume level to the intermediate value before execution.)
Press the DSP key to advance one step to the next item.
To skip a step, press the MUTE key.
(To end the DIAG function during the AD test of Step 5, keep pressing the DSP key for a long period of time.)

1. Device test (DEVICE) . . . . . . . . . . . . . . . . . . . . . . . . . page 9 2. DEV
2. DSP test (THROUGH) . . . . . . . . . . . . . . . . . . . . . . . . page 10 3. DSP
3. DSP test (DELAY) . . . . . . . . . . . . . . . . . . . . . . . . . . . page 10 3. DSP
4. FL test (Automatic FL change) . . . . . . . . . . . . . . . . . page 10 4. FL
5. AD test (KEY reception test) . . . . . . . . . . . . . . . . . . . page 11 5. AD
The AD test checks if pressing of each key is received properly or not.
Press the key in the order of USB, PC, AUX1, AUX2, DSP, MUTE, DOWN (q) and UP (w).

For the details of Steps 1 through 5, refer to the item corresponding to each step described hereafter.




2. DEV (Device Test)
This menu checks each of the five devices (IC417, 430, 438, 447, 475) for an error.
"OK" appears when no error is detected.
When an error is detected, its content is displayed as "NG-XX" (XX in hexadecimal notation).


Display 0 0

0 0 0 0 0 0 0 0
bit 7 6 5 4 3 2 1 0
DP-U50




Display bit Display bit bit7 Unused ("0" usually)
7 6 5 4 3 2 1 0 bit6 Unused ("0" usually)
0 0 0 0 0 0 0 0 0 0 bit5 Unused ("0" usually)
1 0 0 0 1 1 0 0 0 1 bit4 Checks checksum of IC438 (ROM) (0: OK / 1: NG)
2 0 0 1 0 bit3 Checks IC447 (RAM) (0: OK / 1: NG)
3 0 0 1 1 bit2 Checks register Read/Write of IC430 (USS820) (0: OK / 1: NG)
4 0 1 0 0 bit1 Checks register Read/Write of IC417 (YSS928) (0: OK / 1: NG)
5 0 1 0 1 bit0 Checks register Read/Write of IC475 (LC27287B) (0: OK / 1: NG)
6 0 1 1 0
7 0 1 1 1
8 1 0 0 0
9 1 0 0 1
A 1 0 1 0
B 1 0 1 1
C 1 1 0 0
D 1 1 0 1
E 1 1 1 0
F 1 1 1 1




9
DP-U50




3. DSP (DSP Test) 4. FL (FL Test)

Using this menu, it is possible to set the sound field effect This menu is a lighting program for the FL display.
and input signals.
There are 14 sub-menus. 1. AUTO (Automatic FL change)
Changes the display automatically at 1-seond intervals.
1. THROUGH [Remote control code : 7B--16(VDD)]
Passes signals through the DSP section.
All segments light up.
2. DELAY [Remote control code : 7B--1F(TEST)]
Uses the delay function in the DSP section.

3. HALL [Remote control code : 7B--10(HALL)]
Sets the DSP for HALL.

4. JAZZ [Remote control code : 7B--11(JAZZ)]
Sets the DSP for JAZZ.
Segments light up in lattice (Pattern A).
5. CHURCH [Remote control code : 7B--12(CHURCH)]
Sets the DSP for CHURCH.

6. GAME [Remote control code : 7B--13(GAME)]
Sets the DSP for GAME.

7. MOVIE [Remote control code : 7B--14(MOVIE)]
Sets the DSP for MOVIE.
Segments light up in lattice (Pattern B)
8. LIVE [Remote control code : 7B--15(LIVE)]
Sets the DSP for LIVE.

9. PC-ANA [Remote control code : 7B--02(PC)]
Sets the input for PC-ANALOG.




DP-U50
10. PC-Digi
Sets the input for PC-DIGITAL. All segments go off.

11. AUX1-A [Remote control code : 7B--03(AUX1)]
Sets the input for AUX1-ANALOG.

12. AUX1-D
Sets the input for AUX1-DIGITAL.

13. AUX2-A [Remote control code : 7B--04(AUX2)]
Sets the input for AUX2-ANALOG.
2. MANUAL (Manual FL change)
14. RETURN Changes the display every time the DSP key is pressed.
Returns the menu to the main menu (3.DSP). The display contents are the same as the above.

3. RETURN
Returns the menu to the main menu (4. FL).




10
DP-U50



5. AD (AD Test)

There are 13 sub-menu items. 3. JUDGE (Judgment of key voltage level)
Checks if the voltage level of each key is within the normal
1. KEY (Key reception test) range by comparing it with the reference value.
Checks if pressing of each key is properly received, using Use the same order for checking keys as the previous key
the key reception program. Keys should be checked in the reception test.
order of USB, PC, AUX1, AUX2, DSP, MUTE, DOWN (q)
and UP (w). When the key voltage level judge test is executed,
">USB<" appears, urging to press the USB key.
When the key reception test is executed, ">USB<" When the USB key is pressed, "OK:00" appears for 1
appears, urging to press the USB key. second followed by ">PC<", urging to press the next PC
When the USB key is pressed properly, "OK" appears for a key.
moment followed by ">PC<", urging to press the next PC
key.
When all these keys are checked in this way and check
results are satisfactory, this mode is over.
If an incorrect key is received, "NG" appears and testing
OK:00
does not proceed to the next key. To exit from this mode,
keep pressing the DSP key for a long period of time.
Judgment result Measured value

2. LEVEL (Display of key voltage level)
Displays the voltage level of the key and the reference
When the judgment result is not satisfactory, "NG"
value in parallel.
appears.
Use the same order for checking keys as the previous key
reception test.

When the voltage level test is executed, ">USB<" appears,
When the voltage level of all the keys is judged in this way,
urging to press the USB key.
this mode is over.
When the USB key is pressed, "00:00" appears for 1
To exit from this mode before making judgment of all the
second followed by ">PC<", urging to press the next PC
keys, keep pressing the DSP key for a long period of time.
key.
DP-U50




4. V-ERR (Display of power voltage , when abnormal)
Displays for 2 seconds the voltage value when the power
00:00 supply protection function has worked due to abnormal
voltage. (The voltage value is meaningless unless the
power supply protection function has worked.)
Reference value Measured value The voltage value said here is obtained through calculation
using 5V as the reference voltage. Note that deviation of
the reference voltage will result in an error of the voltage
The A/D value is displayed in % (voltage value based on 5V as 100%).
on display.


When the voltage level of all the keys is checked in this
way, this mode is over.
To exit from this mode before checking all the keys, keep
pressing the DSP key for a long period of time.




11
DP-U50



5. V-MAX 7. INIT (Memory initialization)
Sets the main volume to 0dB.
1. MEMORY (Memory reset reservation)
6. V-MID60 Reserves the backup RAM to be reset to the factory
Set the main volume to -20dB. setting before shipping.
Actual initialization is executed when the power is turned
7. V-MID55 on with the DIAG function cancelled.
Sets the main volume to -25dB.
2. CANCEL (Cancellation of memory reset reservation)
8. V-MID52 Makes the memory reset reservation invalid. RAM
Sets the main volume to -28dB. initialization is not executed.

9. V-MID49 3. RETURN
Sets the main volume to -31dB. Returns the menu to the main menu (7. INIT).

10. V-MID29
Sets the main volume to -51dB.

11. V-MID1
Sets the main volume to -79dB.

12. V-MIN
8. VER (Version information)
Sets the main volume to -80dB.
1. SHV
13. RETURN Displays the version information of the microcomputer
Returns the menu to the main menu (5. AD). (IC436).
The final alphabet indicates the version of the boot area. If
the rewrite version is different, it is not transmitted
properly.

2. EGAV
Displays the version information of the gate array (IC475:
LC27287B).




DP-U50
6. USB (USB loop back test) 3. ChckSum
Displays the checksum information of the microcomputer
1. START [Remote control code : 7B--1C (A)] (IC436).
Starts the loop back of USB.
4. RETURN
2. STOP [Remote control code : 7B--1D (B)] Returns the menu to the main menu (8.VER).
Stops the loop back of USB.

3. RETURN
Returns the menu to the main menu (6. USB).

* This menu is used for the factory inspection before
shipping.




12
DP-U50



9. ERROR (Error history) 10. DIT (Digital input/output control)

1 ­ 8 E0 ­E7 (Error history) 1. GENERAL
The history of up to 8 errors is stored in memory. The error GENERAL category code output (0x00)
codes are used to display it.
2. CD
CD category code output (0x01)
Error code Description
00 No error 3. PCM Enc
11 ­ 14 USB internal error PCM Encoder/decoder category code output (0x02)
21 ­ 2B USB interrupt error
2C ­ 2E USB communication error (*1) 4. DAT
2F USB interrupt transmission error DAT category code output (0x03)
41 ­ 46 USB stream error (*2)
Checksum error 5. BS JPN
80
BS JAPAN category code output (0x04)
81 RAM (IC447) Read/Write error
82 AC3D(IC417) Read/Write error
6. Synthe
83 EGAV (IC475) Read/Write error
Synthesizer category code output (0x05)
84 Backup RAM initialized at the power ON (*3)
85 RAM for Y-mersion coefficient initialized at the power ON 7. AD
90 Detection of abnormality in power voltage A/D converter category code output (0x06)
A0 Auto power OFF (24h)
8. SD
(*1) : When the AC plug is plugged and unplugged with USB Solid state memory category code output (0x08)
connected, this error may be recorded but it causes no
problem in actual use. 9. BS Eur
(*2) : This error is not as fatal at to cause any problem in actual BS Euro category code output (0x0E)
use.
(*3) : This code is recorded in the error history at least once 10. MIXER
because the memory is cleared at the time of shipping from Digital signal mixer category code output (0x12)
the factory.
11. SFC
DP-U50




Sampling rate converter category code output (0x1A)

12. DSP
9. CLEAR (Error history clear) Digital sound processor category code output (0x2A)
Clears the entire error history in memory and overwrites
with the normal value (00). 13. L Pa:Ch
Ch Change L bit parent $^ child
10. RETURN
Returns the menu to the main menu (9. ERROR). 14. DIR RV
Digital interface receive code display

15. RETURN
Returns the menu to the main menu (10. DIT).




0. EXIT (DIAG end)

Terminates the DIAG function, executes CPU resetting
and restart operation.
Use the input selector USB for restarting operation.
Executing the memory reset reservation setting will set to
the standby mode.




13
DP-U50




I STANDARD OPERATION CHART
POWER SW to ON
or connecting AC cord




NG Self-Diagnosis
Backup memory mode?
check

OK Setting the initial settings


Did it pass 3.5 NO
seconds from the
starting -up ?
Is the power NO
turned on at the
YES
standby mode ?
Reseting Gate arry IC
YES & USB microcontroller
Communicating with
IC436, 102pin: H GUI application



Resetting FL driver IC IC436, 42pin: L
Turning the toatal mute
IC436, 111pin: H
functon off if headphone
is not connected IC436, 107pin: H


Is the power NO
turned to ON? Standby process


YES


Main process
Turning the power control function on IC436, 89pin: H




DP-U50
Turning the total mute and IC436, 107pin: L
the mix mute function off IC436, 110pin: H




Releasing Gate array IC
from the resetting mode IC436, 112pin: L
DMVDD ON




Resetting YSS928 IC436, 30pin: H
and DAC ICs




Releasing the FL driver IC
IC436, 42pin: H
from the resetting mode




Displaying "Hello"




14
DP-U50




15
AC3D3
DP-U50




/LOCK
DBL/V
ERR/BS
DDIN3
DDIN2
DDIN1
DDIN0
DIRINT
SYNC/U
FS128/C
7 6 5 IPORT5­7
IC417 : YSS928
I IC DATA



VMOD BSMOD DDINSEL UMOD CMOD
DBL




V
U
C
DIRPCO




BS
VDD2
TESTXO
TESTXI
SELI2
SELI3
VSS
SELI4
IPINT
/IC
SCK
SI
SO
/CS
DIRINT
/LOCK
CRC
SURENC
VDD1
KARAOKE
MUTE
AC3DATA
DTSDATA
NONPCM
VSS
ZEROFLG
OVFB/END
RAMA17
RAMA16
RAMA15
RAMA14
RAMA13
RAMA12
SELI5
SELI6
SELI7
SELI8