#2101/#2102
The voltage of the MOTOR CONTROL is supplied from PIN 85(DAC OUT in CPU) of U1, through R3
to PIN(2) of OPAMP U14A. U14A functions as a DC AMP. The Output Voltage can be adjusted using
TRIM POT VR1. Please refer to TEST & ADJUSTMENT for more information on making
adjustments. This DC voltage is applied to the MOTOR DRIVER PWB via DIODE D2 and J208-5.
C. POWER SUPPLY & POWER AMP PWB PWH-68A
This PWB provides POWER SUPPLY, POWER AMP, POWER ON MUTE RELAY and REMOTE
POWER ON circuit.
POWER SUPPLY:
The Primary coil of POWER TRANS EPH-115 can be changed 100V, 120V, 220-230V or 230-240V by
replacing the VOLTAGE SELECT PLUG. There are three lines of +-34V, +-17.5V, +30V secondary
sides of the transformer. Each three lines apply to the power amplifier, +-12 V, +5V regulator IC, and
24V for Motor Power supply.
The devices between the transformer volume line and the rectifier diode PSW 1, 2, 3 are POLY
SWITCHes. These devices together perform the same function as a fuse; however, it is not usually
necessary to replace them after a power surge, as they will automatically reset. RXE-185 in this place is
equivalent to a 1.6A timelag or slo-blo fuse.
POWER AMP
The POWER AMP consists of 1-Channel Amp. U1 and 2-Channel Amp U2.
The two outputs from pins 12 and 13 of U1 are mixed at R8 and R9(0.22 ohm) and supplied through
choke coil relay RL1A, and arrive at the Horn Driver via J102-1. RL1A is a muting Relay which
prevents turn-on pop the power is turned “on” or “off.” The operation of U1 and U2 is identical.
The service technician should exercise caution to avoid a short-circuit.
10-2
Summary of Contents for LESLIE 2102
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