NAD 512 Service Manual

—
SERVICE SAFETY PRECAUTIONS (UL)
1. Use exact replacement parts for critical locations marked “ /J\ 7
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:
ICE MANU,
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.
COMPACT
DISC PLAYER
SER
on
or—
| Lo
ou
a
o
=o
O02
(Oa)

NAD 512 Specifications

General

Brand	NAD
Model	512
Category	CD Player
Language	English

Summary

Service Safety Precautions

Leakage Test Procedures

Outlines methods for performing cold and live leakage tests for safety compliance.

Safety Information

Laser Radiation Warnings

Provides safety warnings and precautions related to invisible laser radiation.

Specifications

Controls and Physical Specifications

Details the player's controls and its physical dimensions.

Panel Overview

Rear and Front Panel Identification

Identifies all connectors and controls located on the rear and front panels.

Block Diagram

Wiring Diagram

Disassembly Instructions

Top Cover Removal

Step-by-step instructions for removing the unit's top cover.

Alignment Procedure

Adjustment Points Diagram

Diagram showing critical adjustment points on the main PCB.

PLL Adjustment

Procedure for calibrating the Phase Locked Loop (PLL) circuit.

RF Adjustment

Procedure for adjusting the Radio Frequency (RF) signal output.

EF Balance Adjustment

Procedure for balancing the Error والف (EF) signal.

Focus Gain Adjustment

Procedure for adjusting the focus gain parameter.

Tracking Gain Adjustment

Procedure for adjusting the tracking gain parameter.

Focus and Tracking Gain Adjustment Guidance

Gain Adjustment Troubleshooting

Table of symptoms and corresponding focus/tracking gain adjustments.

Important Notes

Optical System Pick-Up Handling

Precautions for handling the optical system pick-up to prevent damage.

Laser Beam Emission Safety

Safety guidelines for checking laser beam emission and objective lens movement.

Laser Pick-Up Replacement Precautions

Static Discharge Prevention for Pick-up

Methods to prevent electrostatic discharge damage during pick-up replacement.

PCB Layout (Parts Side)

IC Block Diagrams

Q101 and Q103 IC Diagrams

Internal block diagrams for ICs CXA1081M and CXD1167Q.

Q102 and Q105 IC Diagrams

Internal block diagrams for ICs CXA1082BQ and MN6471M/MN6474M.

Troubleshooting Guide

Exploded View

Exploded View Parts List

Mechanism Exploded View

Mechanism Service Parts List

Electrical Parts List

Capacitors

Detailed list of capacitors with part numbers and specifications.

Mechanism Parts List Continuation

Mechanism Component Details

Continuation of mechanism parts list with additional components.

Resistors and Variable Components

Switches, Jacks, and Miscellaneous

Lists switches, RCA jacks, and miscellaneous items.

Packing Diagram