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Manuals
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NuTone Manuals
Intercom System
SM-428
Service manual
NuTone SM-428 Service Manual
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Table Of Contents
60
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Contents
General Information
Installation
Remote Stereo Speaker Controls
Operational Checkout
Product View
Adjust Volume at each Speaker Station
Stereo Speakers
Additional Balance Adjustment
Phasing Stereo Speakers
Intercom Operation
Intercom/Entertainment Level Set
Master Unit Rear View
I/P Speakes Operating Mode Switches
Speaker Mode Switch in off Position
Speaker Mode Switch in Standby
Speaker Mode Switch in Listen-In
5-Inch Speaker/Clock Timer
Silent (Night) Operation
Record Player/Tape Player
Auxiliary Input/Tape Input
Theory of Operation
Power Supply Module
Power Supply Schematic Diagram
AM/FM Tuner Module
Servicing the Power Supply Module
Operating Voltages
AM/FM Tuner Schematic Diagram
FM Squelch Control
In the Field Adjustment of the Squelch Control
AM/FM Module Component Location-Top View
AM/FM Module Foil Path/Component Connection-Bottom View
AM Tuner
Alignment
Servicing the AM/FM Tuner
Replacing Tuner PC Board Only
AM Alignment
Master Unit Settings
Instrumens Required
FM Alignment
FM Multiplex Decoder Module
FM Multiplex Decoder Schematic Diagram
Dual Audio Preamp and Intercom Preamp Module
Z701 Alignment
Servicing the MPLX Module
Preamplifier/Intercom Preamp Schematic Diagram
Volume, Balance, Bass and Treble Controls
Intercom Preamp
Muting
Key Click Muting
Servicing the Preamp Module
Power Amplifier Module
Output Load
Grounding
Right Speaker(S) Power Amplifier
Power Amplifier Schematic Diagram
Left Speaker(S) Power Amplifier
Servicing the Power Amplifier Module
Control Module
Circuit Changes
Control Circuit Operating Voltages
Master Unit Terminal Board/Remote Components Wiring
Servicing the Control Module
Bench Servicing
Speaker/Clock Timer
All I/P Speakers in RI Mode
Activate Door Listen Switch
Activate I/P Talk Switch
Speaker No.1 in Standby (Intercom Only) Mode
Speaker No.1 in Listen-In (LI) Mode
Speaker No.1 in off Mode
System Servicing
Disassembly
Removing Master Unit
Replacing Individual Modules
Replacing Pilot Lights
Removing Complete Tuner Assembly
Troubleshooting
Removing Master Unit Parent Board
Replacing Front Panel Assembly
System Dead - no Pilot Lights
No Sound at I/P Speakers
Distortion at All Speakers
Muting on - no Talk on Listen Switch Is Being Activated
Low Frequency Feedback between Speakers During Intercom Operation
Replacement Parts List
PC Boards View
Schematic Diagram
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