Roland Boss GT-10, Service Notes

16

Mar. 2008

GT-10

System Update Error Messages

If the update fails, a message like the ones shown below is displayed.

Check Sum Error

A problem was found in the checksum value for the received Standard MIDI 
file (SMF).

Receive Error

The received SMF may have a problem, the MIDI transmission may have been 
interrupted, or the MIDI cable may be disconnected or have a broken wire.

Flash Write Error

Writing to the flash ROM failed. The peripheral circuitry for the flash ROM 
may be defective, or the MIDI cable may be disconnected or have a broken 
wire.

Also, if two asterisks (“*”) are displayed while data is being received, it means 
that receipt of MIDI data has failed.

* Stopping partway through and resending also causes two asterisks to be 

displayed, but this does not signify a problem.

Test Mode

Items Required

• Expression pedal (Roland EV-5) x 1

• MIDI cable x 1

• USB cable x 1

• Cable with a 1/4-inch phone plug x 1 (having a 33-ohm resistor [1/4 W 

or more] connected between L channel and ground and between R 
channel and ground)

• DIGITAL IN-compatible device x 1 (device that converts digital audio 

signal to analog audio signals: Roland DA-400 or the like)

• Digital audio cable (coaxial) x 1

• Computer x 1

• Headphones x 1 set

• Oscilloscope x 1

• Monitor speaker x 2

• Noise meter x 1

• Tester x 1

• 47-k ohm plug x 1 (having a 47-k ohm resistor connected between the 

signal line and ground, and having a metal cover [shielding] over the 
area where the resistor is mounted)

• Dummy plug x 1 (open plug)

• Push/pull force gauge (capable of measurement from 100 g to 1 kg and 

from 10 kg to 50 kg)

• Cable for measurement of DC IN current consumption

fig.check-cable.eps

* Before starting, on the computer, install and set up the folder containing the 

dedicated USB driver for the GT-10 (GT-10 USB Driver) and the dedicated USB 
checking software for the GT-10 (USBCheck.exe, the DLL, the settings file, and 
the like). The GT-10 USB Driver and USBCheck.exe are obtained via Service 
Network. USBCheck.exe runs only under Windows XP.

Entering the Test Mode/Selecting Test 
Items

1.

Hold down [OUTPUT SELECT] and [SYSTEM] and switch on the power.

* Continue holding down the buttons until a screen like the one shown below 

appears.

fig.1version.eps

2.

Turn the dial to select the test item, then press [CATEGORY/ENTER].

Test Items

Quitting the Test Mode

Switch off the power.

Test items in the Test Mode

Screen display

Test description

Page where 
described

1. VERSION

Version Verification

p. 17

2. DEVICE

Testing of the Peripheral ICs for 
the CPU and for the DSP

p. 17

3. LCD/ENC

Testing Covering LCD Contrast, 
Missing LCD Dots, and Encoder 
Operation

p. 17

4. SW/LED

Testing of Operation Switches 
and LEDs

p. 18

5. OUTPUT LEV

Testing of the OUTPUT Control

p. 18

6. PARAM KNOB

Testing of the PARAMETER Con-
trols

p. 18

7. INT EXP

Testing of the Expression Pedal 
and Pedal-calibration Settings

p. 18

8. EXT EXP

Testing of the External Pedal Jack

p. 19

9. MIDI

MIDI Test

p. 19

10. AMP CTRL

Testing of the AMP CONTROL 
Jack

p. 19

11. USB&D.OUT

Testing of the USB Circuitry and 
DIGITAL OUT Circuitry

p. 19

12. OUTPUT&MUTE

Testing of SEND, PHONES, OUT-
PUT L/R, the MUTE Circuitry for 
each output, and the OUTPUT -
10/+4 dB Switching Circuitry

p. 20

13. INPUT

Testing of the INPUT Circuitry

p. 21

14. RETURN

Testing of the RETURN Circuitry 
and the RETURN Jack Switch

p. 22

15. INPUT NOISE

Testing of Residual Noise and 
Shock at the Respective Outputs

p. 22

16. LOOP NOISE

Testing of the SEND/RETURN 
Connection and RETURN Shock

p. 22

17. FACT RESET

Factory Reset

p. 22

Test items outside the Test Mode

Test name

Test description

Page where 
described

Short check

Testing of AMP CTRL Insulation

p. 22

EXP pedal operation-
load test

Testing of Load at Which Move-
ment of the Expression Pedal 
Starts

p. 23

Muting and Play 
Mode test

Testing of Muting Circuitry and 
Verification of Product Startup

p. 23

Current-consump-
tion Test

Verification of Current-consump-
tion Value for DC IN

p. 23