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#3300P
An advanced feature is the Rotation Speed Adjusting-mode. It enters this mode by pressing
the Foot-Switch for 5 seconds or longer at Power ON. By using the LED on the panel, the Rotation
Speed of Slow and Fast is controlled.
Refer to Page 11 of the Owner's Guide for details.
The function of the U2 is to control the Rise/Fall of the Motor Control Voltage, together
with the constant circuit at the time of VR1,2,3,4 and C51,52.
The TR Q1,3 and the TR Q2,4 are driving circuits to switch ON/OFF +12V and convert the
Slow/Fast signals, sent from the
Finally, the voltage for controlling the speed is put out from the J205-3PIN and 6PIN to the
LGH-43A PWB.
The Power circuit makes +12V and +5V for the U1 from +15V from the PWH-74C by using
the U4 (+12V) and the U3 (+5V).
C. POWER SUPPLY & POWERAMP PWB (PWH-74C)
This PWB consists of the Power Supply, the Power Amp, the Power ON Muting circuit
and the Remote Power ON circuit.
POWER SUPPLY:
The primary side of the Power-Trans EPH-123 is designed for easily switching 100V, 120V,
220- 230V, and 230 - 240V by changing the combination of wirings of the Voltage-Select Plug.
There are three lines of ±34V, ±17.5V, +30V secondary side of the transformer.
From these the Power Amp's power source, ±15V, +24V Motor's power source are produced.
The devices PSW1, 2, 3, placed between the transformer volume line and the rectifier diodes,
are Poly-Switches and function as fuses.
They reset by re-switching ON after removing the reason for the blown fuse.
They do not require replacement in normal use .
The Part No. RXE-185 corresponds to the 1.6A Time lag or Slow Blow Fuse.
POWER AMP:
The Power-Amp consists of 3 channels: 3-Channel Amp IC U1.
The Treble-side amp. and the Bass-side (BTL motion) function as 1 channel.
The output of the U1 Amp is mixed through R8,9 (0.22 ohm) at the Pin 12,13 and is supplied to
the Horn Driver through the Choke Coil L2, via J102-1. The U1 has a Muting circuit for
preventing a Pop Noise at Power ON and OFF.
The heat-sink is equipped with a DC cooling fan, which detects the temperature by the TH1 Thermistor
and the U6
IC.
If the temperature approaches 50 deg C, the DC fan automatically turns and prevents excess
heating of the
heat-sink.
REMOTE POWER ON:
The T1 is a Sub-Power-Transformer for the Remote-Power-ON circuit. It is always connected to
the power source, even when the main power is switched OFF. The Power-ON signal of the Leslie
11-pin is connected to the RL3, and, if the terminal goes down to the GND level, the RL3C is switch-
ed ON and = the Power is switched ON, and, if the organ and the 11-pin cable are connected, the
Power Switches on the organ and the Leslie operate simultaneously.
U1,
and send to the Adjusting circuit of the U2 Rise/Fall Time.
9-2
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