Distinguishing The Dd-3, 3A, 3B, And 3C; Cautionary Notes - Roland DigitalDelay DD-3 Service Notes

Jun. 2010
Distinguishing the DD-3, 3A,
3B, and 3C
The DD-3 and DD-3(T) include four types having differing circuit structures:
the DD-3, DD-3A, DD-3B, and DD-3C. On each, the pedal is labeled Digital
Delay DD-3, making them appear identical at first glance, but you can use the
following two methods to tell them apart.
After distinguishing the type of the product to be serviced, refer to the
corresponding Service Notes for the required parts and test methods.
DD-3: Service Notes DD-2/3 (#17059183)
DD-3A: Service Notes DD-3A (#17059557)
DD-3B: Service Notes 3rd Edition (#17059557E3)
DD-3C: Service Notes DD-3C (#17059557E4)
This version of Service Notes is for the DD-3C.
Distinguishing the Product (1)
The four types can be distinguished by differences in appearance, production
number, and components mounted on the circuit board. Refer to the table
below.
DD-3
Appearance Figure 1
Production
Up to SO81199
number
Components on
Radial components present
circuit board
fig.DD3.eps
Figure 1 — DD-3
fig.DD3AB.eps
Figure 2 — DD-3A, DD-3B, or DD-3C
Distinguishing the Product (2)
The DD-3C can be distinguished from the DD-3A or DD-3B by differences in
operation when an AC adaptor is connected.
* This method is limited to correctly operating products.
Follow the procedure shown below.
1.
Connect an AC adaptor.
2.
Adjust the MODE control to a setting other than HOLD.
3.
Depress the pedal.
If the CHECK indicator lights up at this time, the product is the DD-3A or
DD-3B. The DD-3C does not light up.
4.
Insert a plug into the INPUT jack.
If the CHECK indicator lights up for the first time here, the product is the
DD-3C.
2
DD-3(T)
DD-3A DD-3B DD-3C
Figure 2
S91200 or later
Radial components
absent

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.
Part Replacement
When replacing components near the power-supply circuit or a heat-
generating circuit (such as a circuit provided with a heat sink or including a
cement resistor), carry out the procedure according to the instructions with
respect to the part number, direction, and attachment position (mounting so as
to leave an air gap between the component and the circuit board, etc.).
Parts List
A component whose part code is ******** will not 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).
• Because it is carried in electronic data on the Roland web site.
• Because it is a package or an accessory irrelevant to the function
maintenance of the main body.
• Because it can be replaced with an article on the market. (battery or etc.)
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.
DD-3(T)