Cautionary Notes; Specifications - Roland BOSS Chromatic Tuner TU-3 Service Notes

Dec. 2009

Cautionary Notes

Before beginning the procedure, please read
through this document. The matters described may
differ according to the model.
User Data Cannot Be Saved
This product cannot save user data. Refer to "Data Backup and Restore
Operations" (p. 8) and note down the information on paper as 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.
2

Specifications

TU-3: Chromatic Tuner
Tuning Range
C0 (16.35Hz)–C8 (4186Hz)
Reference Pitch
A4=436–445 Hz (1Hz step)
Tuning Accuracy
±1 cent
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
30 mA (DC 9 V)
85 mA (DC 9 V, when High Brightness mode is on)
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
Weight
390 g / 14 oz (including battery)
Accessories
Owner's Manual (#5100007386)
Leaflet ("USING THE UNIT SAFELY,""IMPORTANT NOTES," and
"Information") (#********)
Dry battery/9 V type (6F22) (#********)
Options
AC adaptor: PSA series
Parallel DC cord: PCS-20A
* Duration of continuous use with battery operation: These figures will vary
depending on the actual conditions of use.
When the tuner is
continuously on
Battery
When High
Brightness
mode is off
5.5 hours
Carbon
14 hours
Alkaline
* The battery that was supplied with the unit is for temporary use, intended
primarily for testing the unit's operation.
* Printed matters will not be supplied after the end of the production. Then,
download the electronic file from the Roland web site.
* In the interest of product improvement, the specifications and/or appearance of
this unit are subject to change without prior notice.
TU-3
When the tuner is on
for one minute and off
for three minutes
When High When High When High
Brightness Brightness Brightness
mode is on mode is off mode is on
0.5 hours 12 hours
3 hours 23.5 hours
2 hours
11 hours