Roland JD-XA Service Notes page 34

Jul. 2015
5. VCF2 Check
This verifies the circuit of VCF2 (Transistor Ladder Filter).
+————————————————+
|A1-VCF2: CUT Min|
|Press [ENTER]
+————————————————+
1.
Verify that the frequency of the signal shown in the figure is lower than
20 Hz.
fig.test-a-5-1.eps
2.
Press Enter.
A screen like the one shown below is displayed.
+————————————————+
|A1-VCF2: CUT Max|
|Press [ENTER]
+————————————————+
3.
Verify that the frequency of the signal shown in the figure is higher than
8 kHz.
fig.test-a-5-2.eps
4.
Press Enter.
A screen like the one shown below is displayed.
+————————————————+
|A1-VCF2: RES Min|
|Press [ENTER]
+————————————————+
5.
Verify that no signal is output, and then press Enter.
Execution advances to the check of the next wave form.
6. For A2-VCF2, A3-VCF2 and A4-VCF2, verify in the same way as steps 1
through 5.
7.
Press to advance to the next test item.
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6. VCF3 Check
This verifies the circuit of VCF3 (State Variable Filter).
+————————————————+
|A1-VCF3: CUT Max|
|Press [ENTER]
+————————————————+
1.
Verify that a signal like the one shown in the figure is output.
fig.test-a-6.eps
2.
Press Enter.
A screen like the one shown below is displayed.
+————————————————+
|A1-VCF3: CUT Min|
|Press [ENTER]
+————————————————+
3.
Verify that no signal is output, and then press Enter.
Execution advances to the check of the next wave form.
4. For A2-VCF3, A3-VCF3 and A4-VCF3, verify in the same way as steps 1
through 3.
5.
Press to advance to the next test item.
7. Routing Check
This verifies the signal flow of each oscillator and filter.
+————————————————+
|A1-Routing1: ON|
|Press [ENTER]
+————————————————+
1.
Verify that a signal is output, and then press Enter.
2. For A1-Routing2 through 9, verify in the same way as step 1.
* Wave forms are different for each routing.
At last, when Enter is pressed, a screen like the one shown below
appears.
+————————————————+
|A1-Routing10:OFF|
|Press [ENTER]
+————————————————+
3.
Verify that no signal is output, and then press Enter.
4. For A1-Routing11 and 12, verify in the same way as step 3.
5.
For A2-Routing1 through A2-Routing12, verify in the same way as steps
1 through 4.
6.
For A3-Routing1 through A3-Routing12, verify in the same way as steps
1 through 4.
7.
For A4-Routing1 through A4-Routing12, verify in the same way as steps
1 through 4.
8.
Press to advance to the next test item.
JD-XA
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