Boss Roland RC20 E Schematic
RC-20 May. 2001
8
TEST MODE
Test items
1. FLASH ROM check
2. Version number check
3. Switch and LED check
4. LEVEL volume check
5. GUIDE volume check
6. DA check
7. Output check
8. INST volume check
9. MIC volume check
10. MUTE check
11. AUX IN (NORMAL) check
12. AUX IN (FLAT AMP SIMULATE) check
13. AUX IN (CENTER CANCEL) check
14. AUX IN (L ch) check
15. CN2 solder spot check
16. Noise check
17. Battery operation check
Note : Test items 7.to15. also include a PHRASE SELECT volume
check.
Items required for tests
• Oscillators x 2
• Oscilloscope
• Noise meter
• Monitor amp
• FS-5U x 2
• 1k ohm stereo short plug
• 150 ohm short plug
• 47k ohm short plug
• J-5
• Stereo mini <-> monaural phone conversion cable
Entering test mode
• Set all volumes to minimum.
• While holding down the left pedal (REC/PLAY/OVERDUB) and right
pedal (STOP/TAP TEMPO), connect the adaptor to the ADAPTOR
JACK to turn on the power.
• When only the POWER LED is lit, within two seconds press the left
pedal and then the right pedal.
• You will enter Test mode, and all LEDs other than "PEAK" will either
light or blink.
Note : A FLASH ROM check is automatically performed when
you enter Test mode. The state of the LEDs when you enter
Test mode will depend on the result of this test. For details
refer to the following item "1. FLASH check."
For details on how to skip directly to a desired test item,
refer to "Skipping directly to the desired test," following the
explanations of each test item.
Explanation of each test item
1. FLASH ROM check
• Enter Test mode.
• The FLASH ROM check will be performed when you enter Test mode.
• If there are no problems, all LEDs other than "PEAK" will light.
If there is a problem, the state of the LEDs will indicate the problem as
follows.
"OVERDUB" (yellow) blinking : MAKER ID error
"PLAY" (green) blinking : DEVICE ID error
"REC" (red) blinking : BUSY error
Note : If a problem was found, operation will stop and it will not
be possible to proceed to the next step. Turn off the power
to exit Test mode.
If there are any unlit LEDs regardless of whether or not
there was a problem, it is possible that the LED is faulty or
soldered incorrectly. (With the exception of "PEAK.")
2. Version number check
• Press the right pedal.
• The internal ROM version number and the external FLASH ROM ver-
sion number will be indicated by the LEDs.
Internal ROM version number display
This is indicated by the four LEDs "FLAT AMP SIMULATE", "CEN-
TER CANCEL", "NORMAL", and "INST & MIC."
"FLAT AMP SIMULATE" only lit : Ver1.00
"CENTER CANCEL" only lit : Ver1.01
"NORMAL" only lit : Ver1.02
"INST & MIC" only lit : Ver1.03
External FLASH ROM version number display
This is indicated by the following seven LEDs: "REVERSE", "TAP
TEMPO", "WRITE", "EXIT", "AUTO START", "MEMORY FULL",
and "LOOP QUANTIZE."
"REVERSE" only lit : Ver1.00
"TAP TEMPO" only lit : Ver1.01
"WRITE" only lit : Ver1.02
"EXIT" only lit : Ver1.03
"AUTO START" only lit : Ver1.04
"MEMORY FULL" only lit : Ver1.05
"LOOP QUANTIZE" only lit : Ver1.06
• After verifying the version, press the right pedal.
• All LEDs other than "PEAK" will light.
3. Switches and LED check
• Connect two FS-5U units to the PHRASE SHIFT jack and REVERSE
jack.
• Set the FS-5U polarity switches to the position shown in the diagram.
• Press the REVERSE switch.
• Verify that "REVERSE", "PLAY", "OVERDUB", and "PHRASE
USED" go dark, and that "TAP TEMPO" changes from orange to red.
• Press the TAP TEMPO switch, and verify that "TAP TEMPO" goes
dark.
• Press the WRITE switch, and verify that "WRITE" goes dark.
• Press the EXIT switch, and verify that goes dark "EXIT."
• Press the AUTO START switch, and verify that "AUTO START" goes
dark.
• Press the MODE switch, and verify that "INST & MIC", "NORMAL",
"CENTER CANCEL", and "FLAT AMP SIMULATE" go dark.
• Press the FS-5U that is connected to the PHRASE SHIFT jack, and ver-
ify that "MEMORY FULL" goes dark.
• Press the FS-5U that is connected to the REVERSE jack, and verify that
all LEDs other than "PEAK" light.
RC-20 May. 2001
9
Excessive level NG Insufficient level NG
(0.5 V/DIV, 1 mS/DIV) (0.5 V/DIV, 1 mS/DIV)
+DC NG -DC NG
(0.5 V/DIV, 1 mS/DIV) (0.5 V/DIV, 1 mS/DIV)
6. DA check
• Once again check the output waveform at the point that "5. GUIDE vol-
ume check" is completed, to check the DC leakage and level.
In the following cases, the result is NG.
7. Output check
• Set the INST volume and MIC volume to 'maximum.'
• Set the PHRASE SELECT volume to the '2' position.
• Verify that "OVERDUB" and "REVERSE" are lit.
• Verify that the output waveform is as shown in the diagram.
Note : The waveform will change slightly depending on the inac-
curacy of the input function.
8. INST volume check
• Set the PHRASE SELECT volume to the '3' position.
• Verify that "REVERSE" is dark and "TAP TEMPO" is lit red.
(0.5 V/DIV, 1 mS/DIV)
200 Hz, 2.2 Vp-p ± 0.2 Vp-p
(0.5 V/DIV, 1 mS/DIV)
(0.5 V/DIV, 1 mS/DIV)
200 Hz, 2.2 Vp-p ± 0.2 Vp-p
gram below. Connect your oscilloscope to OUTPUT.
• Connect your waveform measurement equipment as shown in the dia-
4. LEVEL volume check
MIC : 200 Hz, sine wave, -34 dBm
AUX IN : 200 Hz, square wave, 200 mVp-p, STEREO
then back to the minimum position.
that the waveform increases smoothly.
At this time, the MODE LEDs will light consecutively from "FLAT
AMP SIMULATE," following the waveform.
• Move the LEVEL volume to approximately the center position, and
Input INST : 200Hz, square wave, 200 mVp-p
• Move the LEVEL volume from 'minimum' to 'maximum', and verify
is the same as shown in the diagram.
• With the LEVEL volume at maximum, verify that the output waveform
then back to the minimum.
that the waveform increases smoothly.
At this time, the MODE LEDs will change successively from "FLAT
AMP SIMULATE," following the waveform.
• Move the GUIDE volume to approximately the center position, and
• Move the GUIDE volume from 'minimum' to 'maximum,' and verify
5. GUIDE volume check
is the same as shown in the diagram.
• With the GUIDE volume at maximum, verify that the output waveform
RC-20 May. 2001
10
(0.5 V/DIV, 1 mS/DIV)
1.2 Vp-p ± 0.2 Vp-p
(0.5V/DIV, 1mS/DIV)
(0.5V/DIV, 1mS/DIV)
• Set the INST volume to 'minimum,' and slowly move it to 'maximum.'
• Verify that the waveform increases smoothly.
• Verify that that when the INST volume is at maximum, the waveform is
the same as shown in the diagram.
9. MIC volume check
• Set the PHRASE SELECT volume to the '4' position.
• Verify that "TAP TEMPO" changes from red to green.
• Set the MIC volume to minimum, and gradually move it to maximum.
• Verify that the waveform increases smoothly.
• Verify that "PEAK" lights as shown in the diagram.
• Verify that when MIC volume is at maximum, the waveform is the
same as shown in the diagram.
• Connect a noise meter to OUTPUT, and verify that the reading is in the
range of -1.0 dBm +/- 1.5 dBm.
10.MUTE check
• Set the PHRASE SELECT volume to the '5' position.
• Verify that "TAP TEMPO" is dark and "LOOP QUANTIZE" is lit.
• Verify that the output waveform is the same as the waveform shown in
the diagram.
• Connect a noise meter to OUTPUT, and verify that the reading is in the
range of -22.0 dBm +/- 1.5 dBm.
11.AUX IN (NORMAL) check
• Set the PHRASE SELECT volume to the '6' position.
• Verify that "LOOP QUANTIZE" is dark and "PHRASE USED" is lit.
• Verify that the output waveform is the same as the waveform shown in
the diagram.
12.AUX IN (FLAT AMP SIMULATE) check
• Set the PHRASE SELECT volume to the '7' position.
• Verify that "PHRASE USED" is dark and "INST & MIC" is lit.
• Verify that the output waveform is the same as the waveform shown in
the diagram.
• Press the FS-5U that is connected to the REVERSE jack, and verify that
the waveform does not decrease.
13.AUX IN (CENTER CANCEL) check
• Set the PHRASE SELECT volume to the '8' position.
• Verify that "INST & MIC" is dark and "NORMAL" is lit.
• Verify that there is no longer an output waveform.
Note : If the waveform remains, it is possible that the CENTER
CANCEL section is NG, or that there is a spot of solder on
the connector.
14.AUX IN (L ch) check
• Set the PHRASE SELECT volume to the '9' position.
• Verify that "NORMAL" is dark and "CENTER CANCEL" is lit.
• Input only the L channel to AUX IN.
• Verify that the output waveform is the same as the waveform shown in
the diagram.
Note : Verify that when compared with the output waveform of
"12. AUX IN (FLAT AMP SIMULATE) check," the phase
is inverted.
(0.5V/DIV, 1mS/DIV)
0.6Vp-p ± 0.1Vp-p
(0.5V/DIV, 1mS/DIV)
2.0Vp-p ± 0.2Vp-p
(0.5V/DIV, 1mS/DIV)
1.8Vp-p ± 0.2Vp-p
(The start illuminating of the LED indication.)
(The LED indication will stay illuminated.)
RC-20 May. 2001
11
15.CN2 solder spot check
• Set the PHRASE SELECT volume to the '10' position.
• Verify that "CENTER CANCEL" is dark and "FLAT AMP SIMU-
LATE" is lit.
• Verify that there is no longer an output waveform.
Note : If the waveform remains, it is possible that there is a spot of
solder between pins 1-2 or 2-3 of CN2.
• Set the PHRASE SELECT volume to the '11' position.
• Verify that all LEDs are lit except for "PEAK."
• Verify that the output waveform is the same waveform as shown in the
diagram.
16.Noise check
• Set the PHRASE SELECT volume to the '2' position.
• Connect a 47k ohm short plug to the INST jack, a 150k ohm short plug
to the MIC jack, and a 1 k ohm stereo short plug to the AUX IN jack.
• Connect a monitor amp to OUTPUT.
• Set the INST volume and MIC volume to the maximum.
• Drop the unit from a height of 10 cm, and verify that no abnormal noise
is output.
• Turn the INST volume and MIC volume, and verify that no abnormal
noise is output.
• With the INST volume and MIC volume at the maximum positions,
measure the residual noise, and verify that it is less than -78 dBm (IHF-
A).
17.Battery operation check
• Put the battery in the battery compartment and insert the plug into the
INPUT jack.
• Check that power is turned on.
• Check that the unit is operating normally.
Note : Always check the battery after repairing or servic-
ing the product.
Skipping directly to the desired test
• Enter Test mode.
• The FLASH ROM check will occur automatically, and if there is no
problem, all LEDs other than "PEAK" will light.
• Follow the procedure described in the section for the test you want to
perform.
Note : In order to perform "5. GUIDE volume check," you must
first perform "4. LEVEL volume check."
Note : Even if it is not immediately after entering Test mode, you
can select the desired test item in the same way whenever all
LEDs other than "PEAK" are lit.
Exiting Test mode
• Disconnect the plug from the ADAPTOR jack to turn off the power.
Cautions
After repairing or servicing the product, you must check all test items.
SERIAL DUMP AND
UPDATE PROCEDURE
The following data can be transmitted and received between two RC-20
units without using any other devices.
1. Program
The operating program is stored in CPU ROM, but some processing can
be altered by applying patches.
This corresponds to such patch data.
2. Guide sound
3. Phrases (1 - 11)
Procedure
1. Connect the transmitting RC-20 and the receiving RC-20 as follows.
Connect the REVERSE jack and PHRASE SHIFT jack respectively.
Transmitting RC-20 Receiving RC-20
REVERSE ----------> PHRASE SHIFT
PHRASE SHIFT ----------> REVERSE
2. Start up the transmitting RC-20 in Dump mode.
1)While holding down the [TAP TEMPO] and [AUTO START] buttons,
turn on the power of the transmitting RC-20.
2)[EXIT] and the [FLAT AMP SIMULATE] and [REC] [PLAY]
[OVERDUB] indicators will light.
3. Start up the receiving RC-20 in Update mode.
1)Turn the [LEVEL] knob and [GUIDE] knob all the way to the left.
2)Set the [PHRASE SELECT] knob to 1.
3) While holding down the [REVERSE] and [MODE] buttons, turn on the
power of the receiving RC-20.
4)Within three seconds of turning on the power, press the [REVERSE]
button and then the [MODE] button.
[WRITE] and the [FLAT AMP SIMULATE] and [REC] [PLAY]
[OVERDUB] indicators will light.
* In Dump mode the [EXIT] indicator will light, but in Update mode the
[WRITE] indicator will light.
4. Select the data that you want to send from the transmitting RC-20
1)Press the [TAP TEMPO] button to select the data that you want to send.
[TAP TEMPO] indicator
Dark : Program, Guide sound, All phrases
Green : Specified phrase
Red : Guide sound
Orange : Program
2)If the [TAP TEMPO] indicator is green, use the [PHRASE SELECT]
knob to select the phrase that will be transmitted.
5. Transmit the data from the transmitting RC-20.
Transmission will begin when you press the left pedal of the transmit-
ting RC-20.
When the [MODE] indicators of both the transmitting RC-20 and the
receiving RC-20 stop at "FLAT AMP SIMULATE," transmission/
reception has been completed.
* With the factory settings, transmitting the program, guide sound, and all
phrases will require approximately 15 minutes.
Note : Never turn off the power until transmission/reception has
been completed.
(0.5V/DIV, 1mS/DIV)
200Hz, 2.2Vp-p ± 0.2Vp-p
Loading...