Roland GT-6 - Error Message; Normal Error Message; Error messages in test mode

34
Sep. 2001
ERROR MESSAGE
Normal Error Message
fig.EM-1
The memory backup battery inside the GT-6 has run down. (This message will
appear when the power is turned on.)
Replace the battery as soon as possible. For battery replacement, please contact
a nearby Roland service center or your dealer.
fig.EM-2
There is a problem with the MIDI cable connection.
Check to make sure the cable has not been pulled out or is not shorted.
fig.EM-3
You’ve attempted to switch patches by rotating the [PATCH/VALUE] dial,
but the Dial function (p. **) is set to “VALUE Only.”
If you want to be able to switch patches using the [PATCH/VALUE] dial, set
the Dial function to “PATCH No.& VALUE.”
fig.EM-4
More MIDI messages were received in a short time than could be processed
correctly.
Error messages in test mode
DSP check
fig.EM-1
Problem : The data written in the DSP (IC8) PROM and the data read do not
match.
* Check the following parts and wiring.
DSP(IC20): pins 77-79, 81-84, 86-89, 91-92, 94-97, 99-100, 102-107
fig.EM-2
Problem : The data written to the DRAM (IC24) via the DSP (IC20) and the
data read do not match.
* Check the following parts and wiring.
DSP(IC20): pins 7-10, 12-14, 16, 17, 19-21, 23-25, 27, 32-35
DRAM(IC24): pins 1-44
BATTERY check
fig.EM-3
“LOW” is displayed when 2.7 V or lower.
fig.EM-4
“No Battery !!” is displayed when a battery is not inserted.
* Insert a new lithium battery.
If an error message continues to appear when a new lithium battery is
inserted, check the following parts and wiring.
CPU(IC21):pin 84
OP.Amp(IC25):pins 1-5
Resistor(R80, R81, R82, R121)
Diode(D9, D10)
Capacitor(C118, C136)
MIDI Check
fig.EM-5
Problem : No MIDI cables are connected.
fig.EM-6
Problem : The data sent (MIDI OUT) and the data received (MIDI IN) do not
match.
* Check the following parts and wiring.
• MIDI IN
CPU(IC21):pin 12
Resister(R67-R69)
Capacitor(C80)
Photo Coupler(IC13)
Diode(D6)
• MIDI OUT
CPU(IC21):pins 10
Resister(R76,R77,R138)
Gate IC(IC16)
DSP Pitch interruption signal check
fig.EM-7
Problem : The interruption signal generated from DSP (IC8) internal oscillation
is not recognized.
* Check the following parts and wiring.
CPU(IC21):pin 8
DSP(IC20):pin 75