Roland syb-5, Service Notes

9

SYB-5

advances to the FREQ Volume Check.

*

The DIRECT Volume Check and EFFECT Volume maximum value are detected 
simultaneously. The DIRECT Volume Check is not run unless the EFFECT 
Volume maximum is detected.

4. FREQ Volume Check

• Rotate the knob in the clockwise direction from minimum to center, then 

to maximum; CHECK should change from lit to off to lit.

• When the maximum is detected, CHECK lights up, and then the process 

advances to the RES Volume Check.

*

The FREQ Volume Check and DIRECT Volume maximum value are detected 
simultaneously. The FREQ Volume Check is not run unless the DIRECT 
Volume maximum is detected.

5. RES Volume Check

• Rotate the knob in the clockwise direction from minimum to center, then 

to maximum; CHECK should change from lit to off to lit.

• When the maximum is detected, CHECK lights up, and then the process 

advances to the DECAY/RATE Volume Check.

*

The RES Volume Check and FREQ Volume maximum value are detected 
simultaneously. The RES Volume Check is not run unless the FREQ Volume 
maximum is detected.

6. DECAY/RATE Volume Check

• Rotate the knob in the clockwise direction from minimum to center, then 

to maximum; CHECK should change from lit to off to lit.

*

The DECAY/RATE Volume Check and RES Volume maximum value are 
detected simultaneously. The DECAY/RATE Volume Check is not run unless 
the RES Volume maximum is detected.

7. Expression Pedal (EV-5) Insertion Check

• Confirm that the MODE control is set to 2.

• With nothing connected to the EXP jack, confirm that CHECK is unlit.

• Connect the EV-5 to the EXP jack. Confirm that CHECK lights up.

8. Expression Pedal (EV-5) Volume Check

• Confirm that the MODE control is set to 3.

• Set the EV-5 pedal so that it is fully raised (minimum setting). Confirm 

that CHECK lights up.

• Depress the EV-5 pedal so that it is completely pressed down (maximum 

setting). Confirm that CHECK lights up. CHECK should be off with the 
pedal between the minimum and maximum positions.

• Unplug the cable from the EXP jack to disconnect the EV-5. Confirm that 

CHECK lights up.

*

Perform this check with the MINIMUM VOLUME on the side of the EV-5 set 
to 0.

9. AF/AD Check

• Confirm that the MODE control is set to 4. CHECK  goes out.

• Use the oscillator to input a sine wave at 200 Hz, -25 dBm (FLAT) to 

INPUT.

• Check the waveform output with the oscilloscope from both OUTPUT 

A(MONO) and OUTPUT B. Confirm that the waveform is the same as 
that shown in the figure and that there is no distortion.

fig.test-AFAD.eps_40

50mV/DIV, 1mS/DIV

• Check the waveform output with the noise meter from both OUTPUT 

A(MONO) and OUTPUT B. Confirm that each waveform output is  and 
between -28.5 dBm and -25.5 dBm(FLAT).

10. DAC, JACK Switch Check

• Confirm that the MODE control is set to 5. CHECK lights up.

• Connect plugs to both the OUTPUT A(MONO) and OUTPUT B jacks, 

and  check the waveform output from both jacks with the oscilloscope. 
Confirm that the waveform output from each is a 400-Hz rectangular 
wave, with the waveform the same as that shown in the figure.

fig.test-DA400Hz.eps_40

50mV/DIV, 1mS/DIV

• Disconnect the plug connected to the OUTPUT B jack.

• Confirm that the waveform output from OUTPUT A(MONO) is a 200-Hz 

rectangular wave, and that the waveform is the same as that shown in 
the figure.

fig.test-DA200Hz.eps_40

50mV/DIV, 1mS/DIV

• Connect the plug to the OUTPUT B jack.

• Confirm that the waveform output from both OUTPUT A(MONO) and 

OUTPUT B is a 400-Hz rectangular wave, with the waveform the same as 
that shown in the figure.

fig.test-DA400Hz.eps_40

50mV/DIV, 1mS/DIV

11. DSP THRU MAXIMUM Output Check

• Confirm that the MODE control is set to 6. CHECK goes out.

• Use the oscillator to input a sine wave at 200 Hz, +5 dBm (FLAT) to 

INPUT.

• Check the waveform output from both OUTPUT A(MONO) and 

OUTPUT B with the oscilloscope. Confirm that the waveform is the same 
as that shown in the figure and that there is no distortion.