DD-7_SERVICE_NOTES.pdf
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May. 2008
DD-7
SERVICE NOTES
Issued by RJA
Table of Contents
Cautionary Notes ..............................................................2
Main Specifications ...........................................................3
Location of Controls .........................................................4
Location of Controls Parts List ........................................4
Exploded View ..................................................................5
Exploded View Parts List.................................................5
Parts List .............................................................................6
Verifying the Version Number........................................8
Performing a Factory Reset..............................................8
Updating the System ........................................................8
Test Mode ...........................................................................9
Circuit Board (Main Board) ...........................................17
Circuit Diagram (Main Board: Analog) .......................18
Circuit Diagram (Main Board: Digital) ........................20
Copyright © 2008 Roland Corporation
All rights reserved. No part of this publication may be reproduced in any form without the written permission
of Roland Cororation.
17058564E0
Printed in Japan (0290) (CC-KWS)
May. 2008
DD-7
Cautionary Notes
Before beginning the procedure, please read
through this document. The matters described may
differ according to the model.
No User Data
This product cannot save user data. Backing up user data during servicing is
not required.
Parts List
A component whose part code is ******** cannot be supplied as a service part
because one of the following reasons applies.
•
Because it is supplied as an assembled part (under a different part code).
•
Because a number of circuit boards are grouped together and supplied as
a single circuit board (under a different part code).
•
Because supply is prohibited due to copyright restrictions.
•
Because reissuance is restricted.
•
Because the part is made to order (at current market price).
Circuit Diagram
In the circuit diagram, “NIU” is an abbreviation for “Not in Use,” and
“UnPop” is an abbreviation for “Unpopulated.” They both mean non-mounted
components. The circuit board and circuit board diagram show silk-screened
indications, but no components are mounted.
2
May. 2008
DD-7
Main Specifications
DD-7: Digital Delay
Nominal Input Level
-20 dBu
Dimensions
73 (W) x 129 (D) x 59 (H) mm
2-7/8 (W) x 5-1/8 (D) x 2-3/8 (H) inches
Input Impedance
1 M
Weight
440 g / 1 lb (including battery)
Ω
Nominal Output Level
- 20 dBu
Accessories
Owner’s Manual English (#G2507366R0)
Mode Sticker (#G2547154R0)
Application Sticker (#G2547160R0)
Leaflet (“USING THE UNIT SAFELY,” “IMPORTANT NOTES,” and
“Information”) (#********)
Dry battery/9 V type (6LR61) (#********)
* The battery that was supplied with the unit is for temporary use-intended
primarily for testing the unit’s operation.
We suggest replacing this with an alkaline dry cell.
Output Impedance
1 k
Ω
Recommended Load Impedance
10 k
Ω
or greater
Delay Time
1 ms to 6400 ms
*
Options
AC adaptor (PSA-series)
Values may vary according to the mode and connections.
Maximum Recording Time
40 seconds (in HOLD mode)
Controls
Pedal switch
E.LEVEL knob, F.BACK knob, D.TIME knob, MODE knob
*
0 dBu = 0.775 Vrms
*
In the interest of product improvement, the specifications and/or appearance of
this unit are subject to change without prior notice.
Indicator
CHECK indicator
(Used for indication of TEMPO, HOLD, and to check battery)
Connectors
INPUT-A (MONO) jack, INPUT-B jack
OUTPUT-A (MONO) jack, OUTPUT-B jack
TEMPO/EXP jack, AC adaptor jack (DC 9 V)
Power Supply
DC 9 V:
Dry battery 6F22 (9 V) type (carbon)
Dry battery 6LR61 (9 V) type (alkaline)
AC Adaptor (PSA-series: optional)
Current Draw
55 mA (DC 9 V)
Expected battery life under continuous use:
Carbon:
1.5 hours
Alkaline:
6 hours
*
These figures will vary depending on the actual conditions of use.
3
May. 2008
DD-7
Location of Controls
fig.panel.eps
Location of Controls Parts List
No.
Part Code
Part Name
Description
Q’ty
1
75E593C0R0
CASE
1
2
G2537516R0
PSA CAUTION
CE 9V N225
1
3
13449717
ADAPTOR JACK
HEC2392-01-150
1
4
F5029423R0
LED
L-3VEGW
1
5
G2477127R0
ROUND KNOB
D-CUT (BLUE/BLACK)
3
F3279852R0
POTENTIOMETER
RD901-20-15FW-B54-006
3
6
G2477127R0
ROUND KNOB
D-CUT (BLUE/BLACK)
1
F3229206R0
POTENTIOMETER
RD901-20-15FW-B50K-08Q7 8CLIC
1
7
F3449150R0
JACK (STEREO+SW)
2LJ-650NHW00
2
8
03344701
6.5MM JACK
HTJ-064-12DS
1
9
13449140R0
JACK(STEREO)
HTJ-064-14D
2
10
75E592T0R0
PEDAL
1
11
22357304R0
PEDAL PLATE
1
12
G2217798R0
PANEL PLATE
1
13
40125101
THUMB SCREW
M3X10 FE ZC
1
4
May. 2008
DD-7
Exploded View
fig.bunkai.eps
10
b
11
a
a
7
b
d
6
2
12
1
9
5
3
4
c
8
Exploded View Parts List
No.
Part Code
Part Name
Description
Q’ty
1
13129710R0
SWITCH(PUSH)
JM-0404
1
2
22267333R0
CUSHION
1
3
F3419102R0
BATTERY CONNECTOR
006P BATTERY SNAP
1
4
G2537516R0
PSA CAUTION
CE 9V N225
1
5
22357305R0
BOTTOM BASE
1
6
22027851R0
BOTTOM COVER
1
7
G2167301R0
INSULATING SHEET
1
8
22157702R0
PEDAL GUIDE BUSH
1
9
22177109R0
COIL SPRING
1
10
22357304R0
PEDAL PLATE
1
11
75E592T0R0
PEDAL
1
12
75E593C0R0
CASE
1
a
40125134
NYLON WASHER 3X6X0.5
2
b
H5019413R0
SCREW M3X10
BINDING MACHINE FEBC
2
c
H5029325R0
SCREW 3X6
B1FEBC
4
d
40125101
THUMB SCREW
M3X10 FE ZC
1
5
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