TC Electronic G-Force, Service Manual

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TC Electronic A/S G-Force Service manual page 6
Built-in Test Program
The G-Force has a Built-in Test Program. To run the program; Press the BYPASS button while powering on. Select RUN TEST PROGRAM and Press ENTER. Follow the instructions on
the display. To leave the Built-in Test Program; turn off the power.
G-Force Built-in-Test Program v3.05 has following tests:
TEST Function / Comments
Keys Tests the keys at the front panel one by one. If a key hasn't been pushed a warning message will appear when leaving the test
IN/OUT knobs Tests the function of the In and Out potentiometers
PARAM+VALUE Tests the steps of the encoders. Each step is counted at the display, if not; check soldering at encoder and front connector.
LED's Tests the LED's at the front panel one by one. If no light; check soldering at the LED and at flat cables between the front boards.
Display Tests all dots in the display. If any missing; replace the display. If the backlight is bad or blinking; check the soldering on the display itself, especially the two
connections going to the upper of the display.
Analog I/O A sine wave is generated on both analog outputs. When connected to one of the analog inputs the dis play reads OK if the level is correct. In this way a
problem might be narrowed down to a specific input or output.
Note: In case of defective IC35 + IC36, they should be replaced with type MC33079
Digital I/O A digital signal is generated on the digital output. When connected to the digital input the display reads OK if the level is correct.
Midi I/O A midi signal is generated on output. When connected to the input the display reads OK if the signal is correct. The midi signal from input is sent on to M IDI
THRU. If not OK; try with another midi cable or check soldering and components in the midi circuit.
Pedal socket Tests the status on the EXTERNAL CONTROL IN. When no jack plug is inserted the tip of the jack socket is connected to ground, this is the reason for
showing OK without jack plug.
PCMCIA Tests whether programming, reading or deleting are OK. NOTE: All data on PCMCIA card will be destroyed.
Battery Tests the DC voltage at the Back up battery. If low; check battery voltage with a multimeter and check also the standby current by measuring the voltage
across R135; max. 20mV (numerical value). If the voltage is higher; replace IC30. When replacing battery, please refer to section "exchange of battery"
System. Tests the MPU, DSP, ASIC and SOUND RAM to some extent. If not OK; see section "startup sequence".