DD-20(T) Entering Test Mode Detailed Test Items 1. Connect standard audio (mono) cables to all of the INPUT A(MONO) and B jacks and OUTPUT A(MONO) and B jacks, and connect a stereo/ monaural converter cable (PCS-31 or similar) to the CTL jack. Connect the other ends to the two FS-5U foot switches, and set the “POLARITY” switch on the FS-5Us towards the FS-5U jacks. 1. DSP, EEPROM Check (also used to indicate the version) • Enter Test mode. • After the unit is switched to Test mode, the version number automatically appears in the LCD as a four-digit number, while simultaneously the DSP and EEPROM check is performed.
• Confirm that all of the LEDs are lit, indicating that no problem was detected. 3. 2. Turn all volume controls completely to the left (to minimum). While holding down the left pedal’s ON/OFF and the right pedal’s TAP/ MEMORY, connect the +9V DC plug to the ADAPTOR jack (which turns on the power). If there is a problem, the cause is indicated by the LEDs as described below. ON/OFF flashing:EEPROM error 4. Only the POWER LED lights up. MEMORY flashing:DSP PRAM error TAP flashing: IRAM error 5. 6. Within four seconds, press the left pedal and the right pedal, in that order. Release the left and right pedals.
MEMORY, TAP flashing:DSP ERAM error ON/OFF, MEMORY flashing:DSP INT error ON/OFF, TAP flashing:DSP DRQ error 7. The unit switches to Test mode, and all of the LEDs light up or flash. 2. Press the [TAP] switch. Confirm that the LCD’s “8.8.8.8” lights up and go off in the sequence shown below. LCD, Switch, LED Checks, Foot Switch Operational Check In “2”, if no +9V DC plug is connected to the ADAPTOR jack, the power can be turned on by inserting batteries in the unit and connecting the INPUT A(MONO) plug. The “DSP, EEPROM Check” commences automatically with entry into Test mode. The status of the LEDs differs when entering into Test mode.
For more detailed information, refer to the item “DSP, EEPROM Check.” The unit cannot enter Test mode unless all of the volume controls are turned to minimum (MODE: “SOS”). To conduct only a specific test, after entering Test mode, switch the MODE volume control to the setting corresponding to the desired test. Although carrying out the procedure in “1” switches the unit to Test mode, “2. LCD, Switch, LED Checks, Foot Switch Operational Check” cannot be run alone. 15