NuTone SM-428 Manuals

Manuals and User Guides for NuTone SM-428. We have 1 NuTone SM-428 manual available for free PDF download: Service Manual

NuTone SM-428 Service Manual

NuTone SM-428 Service Manual (60 pages)

Brand: NuTone | Category: Intercom System | Size: 9 MB

Table of Contents

Contents
2
General Information
3
Installation
3
Remote Stereo Speaker Controls
3
Operational Checkout
5
Product View
5
Adjust Volume at each Speaker Station
6
Stereo Speakers
6
Additional Balance Adjustment
7
Phasing Stereo Speakers
7
Intercom Operation
7
Intercom/Entertainment Level Set
7
Master Unit Rear View
8
I/P Speakes Operating Mode Switches
9
Speaker Mode Switch in off Position
9
Speaker Mode Switch in Standby
9
Speaker Mode Switch in Listen-In
9
5-Inch Speaker/Clock Timer
10
Silent (Night) Operation
10
Record Player/Tape Player
10
Auxiliary Input/Tape Input
10
Theory of Operation
11
Power Supply Module
11
Power Supply Schematic Diagram
11
AM/FM Tuner Module
12
Servicing the Power Supply Module
12
Operating Voltages
13
AM/FM Tuner Schematic Diagram
13
FM Squelch Control
14
In the Field Adjustment of the Squelch Control
14
AM/FM Module Component Location-Top View
15
AM/FM Module Foil Path/Component Connection-Bottom View
15
AM Tuner
16
Alignment
17
Servicing the AM/FM Tuner
17
Replacing Tuner PC Board Only
17
AM Alignment
18
Master Unit Settings
18
Instrumens Required
18
FM Alignment
19
FM Multiplex Decoder Module
20
FM Multiplex Decoder Schematic Diagram
21
Dual Audio Preamp and Intercom Preamp Module
22
Z701 Alignment
22
Servicing the MPLX Module
22
Preamplifier/Intercom Preamp Schematic Diagram
24
Volume, Balance, Bass and Treble Controls
26
Intercom Preamp
26
Muting
26
Key Click Muting
27
Servicing the Preamp Module
27
Power Amplifier Module
28
Output Load
28
Grounding
28
Right Speaker(S) Power Amplifier
28
Power Amplifier Schematic Diagram
29
Left Speaker(S) Power Amplifier
30
Servicing the Power Amplifier Module
30
Control Module
31
Circuit Changes
31
Control Circuit Operating Voltages
33
Master Unit Terminal Board/Remote Components Wiring
34
Servicing the Control Module
34
Bench Servicing
34
Speaker/Clock Timer
35
All I/P Speakers in RI Mode
36
Activate Door Listen Switch
36
Activate I/P Talk Switch
36
Speaker No.1 in Standby (Intercom Only) Mode
37
Speaker No.1 in Listen-In (LI) Mode
37
Speaker No.1 in off Mode
38
System Servicing
39
Disassembly
39
Removing Master Unit
39
Replacing Individual Modules
40
Replacing Pilot Lights
40
Removing Complete Tuner Assembly
40
Troubleshooting
41
Removing Master Unit Parent Board
41
Replacing Front Panel Assembly
41
System Dead - no Pilot Lights
41
No Sound at I/P Speakers
42
Distortion at All Speakers
42
Muting on - no Talk on Listen Switch Is Being Activated
42
Low Frequency Feedback between Speakers During Intercom Operation
42
Replacement Parts List
43
PC Boards View
45
Schematic Diagram
52

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