Dc Circuit Board - Yamaha pw 5000 Service Manual

PW5000
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2. Structure
Power supply circuits ±16 volts, +12 volts, +48 volts
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Safeguard circuits
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Primary power supply voltage (LINE VOLTAGE) display circuit (hereafter, listed as LV)
3. Electrical Performance
3-1 Checking operation
3-1-1 Check LV circuit operation
Check that the LV is displayed simultaneous with turning the primary power on, regardless of whether the power supply
switch is ON or OFF.
3-1-2 Check operation under no-load
① Check that the shorting pins are not connected to the DC OUTPUT.
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Check that turning on the power supply switch lights up the "POWER" LED (green) and the fan rotates. Also check
that there is no operating noise from the power relay and that the "CAUTION (red)", "STOP (red)", and "THERMAL
(red) all light up (total 6 locations) about 4 ± 2 seconds after the power switch is turned on.
② Connect the shorting pin to the DC OUTPUT.
·
Check that the "POWER" LED (green) lights up simultaneous with turning on the power supply switch, and that the
fans (2 units) start rotating.
Check that all 4 of the voltage display LED "NORMAL" (green) light up 4 ± 2 seconds after the power switch is turned on.
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Check that the fan rotates at low speed, when the "FAN AUTO/HIGH" switch is set to the "AUTO" side. Check that the
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fan rotates at high speed and the "HIGH" LED lights up when the fan switch is set the "HIGH" side.
L 13942296513
When finished checking the above "FAN AUTO/HIGH" switch, return the switch to the "AUTO" position.
See Page 21 on Fig. 3 to find the LED lighting locations.
3-1-3 Checking voltage output from the power supply circuits +12 volt line, +48 volt line, +16 volt line,
-16 volt line.
1) +12 volt line
Check that approximately +13 volts is supplied from the voltage measurement connector (across +12V and +12VGND).
2) +48 volt line
Check that approximately +49 volts is supplied from the voltage measurement connector (across +48V and +48VGND).
3) +16 volt line
Check that approximately +17 volts is supplied from the voltage measurement connector (across +16V and ±16VGND).
4) -16 volt line
Check that approximately -17 volts is supplied from the voltage measurement connector (across -16V and ±16VGND).
3-1-4 Check operation of ±16 volt detector circuit
1. Check that about 4 ± 2 seconds after power is turned on while the primary line (CN101 and CN102 of AC 1/3 circuit
board) of the ±16 volt supply is disconnected; among the 4 voltage display LED, the +16, -16 "CAUTION" LED lights
up ("NORMAL" LED of +12, +48 light up). Also check that the unit shuts down about 8 ± 2 seconds after power is
turned on but that the two +16, -16 "CAUTION" LED and the "POWER" LED remain lit up.
2. Check that when power is turned on while the CN502 of AC 3/3 circuit board is removed, the 4 voltage display
"NORMAL" LED light up. Also check that the unit shuts down about 8 ± 2 seconds after power is turned on, and that
only the "POWER" LED remains lit up.
3. Check that when power is turned on while CN209 of DC circuit board is removed, the fan "HIGH" LED lights up (Fan
itself also rotates at high speed). Also check that the 4 "NORMAL" LED, and the "THERMAL" LED light up about 4 ±
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2 seconds after power is turned on. Further check that the unit shuts down about 8 ± 2 seconds after power is turned
on, but that the "THERMAL" "HIGH" and "POWER" LED remain lit up.
After making the above checks, reinsert the connectors that were removed in each item to make the above checks.
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