NAD 712 Service Manual

712 SERVICE MANUAL
TUNER
SERVICE SAFETY PRECAUTIONS (UL)
1, Use exact replacement parts for critical locations marked “ /\*
2. Return lead dress to original position and re-install protective covers.
3. Before returning to customer, test for shock hazard; use either mothod A or B:
A. Leakage test “cold”:
1. Unplug the AC cord; turn power switch ON.
2. Connect one lead of High Voltage insulation Tester to both prongs of the AC plug.
3. Touch other lead to all exposed metal parts.
4, Impedance measurement must be 0.3-5.0 Megohms.
B. Leakage test, “live” :
1. Plug unit directly into the AC outlet: do not use isolation transformer.
2. Connect one lead of the Leakage Current Tester to earth ground.
3. Touch other lead to all exposed metal parts.
4. Leakage measurement must be less than 0.5 milliamps.
AMPLIFIER

NAD 712 Specifications

General

Frequency Response	20Hz to 20kHz
Total Harmonic Distortion	0.03%
Damping Factor	50
Input Sensitivity	2.5mV (MM), 150mV (line)
Channel Separation	50dB (line)
Speaker Load Impedance	4Ω to 16Ω
Power Output	25 watts per channel into 8Ω (stereo)