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May 2002 DD-3(T)
SERVICE NOTES
Third Edition
Issued by RJA
SPECIFICATIONS............................................................. 2
LOCATION OF CONTROLS,PARTS LIST ................... 3
EXPLODED VIEW,PARTS LIST ..................................... 4
PARTS LIST........................................................................ 5
ADJUSTMENTS ................................................................ 8
CIRCUIT BOARD.............................................................. 9
CIRCUIT DIAGRAM...................................................... 10
WARNING
There are three types of DD-3(T) with different circuitry called "DD-3", "DD-
3A" and "DD-3B". The pedals of all three types are labeled "DD-3".
We call the new type of this model, DD-3B for identifying the old type and
new type for convenience on service system.
Check the model name as follows.
Of the three types, only the appearance of the "DD-3" is different. Identify the
"DD-3" or the "DD-3A or DD-3B" by the shape of the adapter jack as shown in
the following figure.
The appearance of the "DD-3A" and the "DD-3B" are the same. Due to a
DRAM change, it has been changed to "DD-3B" from serial No. SO91200 of
1912LOT (produced in August 2001). It can be identified by the serial number.
The "DD-3A" and "DD-3B" can also be identified by the silk-screen printing
on the board.
When referring to the service notes or ordering parts, check the model name
using the above process.
This service note is for the "DD-3B". Refer to "DD-3A SERVICE NOTES"
(#17059557) when repairing the DD-3A. Variable resistor, switch and
mechanical parts for the "DD-3A" and "DD-3B" are compatible. Refer to "DD-
2/3 SERVICE NOTES" (#17059183) when repairing the DD-3.
fig.notice
DD-3A or DD-3B DD-3
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