Roland PowerStack ST-2 Service Notes page 10

Sep . 2 0 1 0
5. BYPASS Test
1 .
Make the connections as show n in the figu re below , then start the u nit in
the normal usage state.
fig.test-5.eps
2 . Dep ress the p ed al to m ake the CHECK LED go d ark.
The effect is sw itched off.
3 . Inp u t signals like those show n below from the signal generator, and
verify that the ou tp u t signals are at the corresp ond ing valu es.
* Set the filter on the noise meter to Flat or DIN audio.
Input signal
50-H z sine w ave at -3.0 d Bm
800-H z sine w ave at -15.0 d Bm
1,600-H z sine w ave at -15.0 d Bm
8,000-H z sine w ave at -15.0 d Bm
6. LED and Battery Operation Test
1 . Insert a battery into the u nit, m ake the connections as show n in the figu re,
then start the u nit in the normal usage state.
fig.test-6-e.eps
Stabilized power supply
2 . Set the ou tp u t voltage of the stabilized p ow er su p p ly to 9.0 V.
3 . Dep ress the p ed al to m ake the CHECK LED light u p .
4 . Set the ou tp u t voltage of the stabilized p ow er su p p ly to 7.5 V.
5 . Verify that the CHECK LED d im s.
6 . Disconnect the p lu g from the DC jack.
7 . Verify that the CHECK LED lights u p brightly.
8 . Dep ress the p ed al several tim es, and verify that the CHECK LED
rep eated ly lights u p and goes d ark.
9 . With the CHECK LED illu m inated , d isconnect the p lu g from the INPUT
jack.
1 0 . Verify that the CHECK LED goes d ark.
1 0
PSA-
ADAPTOR
Output signal
50-H z sine w ave at -3.5 1.5 d Bm
800-H z sine w ave at -15.5 1.5 d Bm
1,600-H z sine w ave at -15.5 1.5 d Bm
8,000-H z sine w ave at -15.5 1.5 d Bm
PLUG etc.
ST-2