Realistic STA-235B User Manual

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Serulce
amuafl
ADDENDUM
for
STA-235B
AM
/FM
STEREO
RECEIVER
Gatalog Number:31
-2065
This ADDENDUM covers
the
changes made
for
"B"
version
of the STA-235.
For
complete coverage
of this model,
you
must
refer
to both
this ADDENDUM
and the
original
Service
Manual for
the
STA-235.
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Realistic STA-235B Specifications

General

Frequency Response	20 Hz to 20 kHz
Total Harmonic Distortion (THD)	0.5%
Speaker Impedance	4 to 16 ohms
Input Sensitivity	2.5mV (phono), 150mV (line)
Signal-to-Noise Ratio	70 dB
Tuning Range	FM
Output	Headphones

Summary

Service Manual Introduction

STA-235B Addendum Details

Information on this addendum covering changes for the STA-235B.

Specifications

FM Section Output Voltage Comparison

Compares FM output voltage between STA-235 and STA-235B.

Block Diagram and Alignment Procedures

Receiver Block Diagram

Diagram illustrating the receiver's internal signal paths.

FM RF and IF Alignment

Procedure for FM RF and IF alignment for the STA-235B.

MPX Alignment Connection

Setup and connection guide for MPX alignment.

Troubleshooting and Alignment Points

Alignment Points Illustration

Visual guide to alignment adjustment points on circuit boards.

FM Operation Troubleshooting

Common FM problems, their causes, and remedies.

Stereo Separation and Volume Troubleshooting

Solutions for poor stereo separation and low FM volume.

Tuner Board Diagrams

Tuner Board 0042 - Top View

Component layout for the tuner board top side.

Tuner Board 0042 - Bottom View

Component layout for the tuner board bottom side.

Main Amplifier Board Diagrams

Main Amp Board 0045 - Top View

Component layout for the main amplifier board top side.

Main Amp Board 0045 - Bottom View

Component layout for the main amplifier board bottom side.

Tone Amp & Auto-M Board Diagrams

Tone Amp & Auto-M Board 0043 - Top View

Component layout for the tone amp and auto-muting board top side.

Tone Amp & Auto-M Board 0043 - Bottom View

Component layout for the tone amp and auto-muting board bottom side.

Parts Lists

Electrical Parts List (Capacitors, Diodes, Coils, Filters)

Detailed list of passive and semiconductor components.

Electrical Parts List (ICs, Lamps, Resistors, Transistors)

List of integrated circuits, resistors, transistors, and lamps.

Variable Components, Switches, and Miscellaneous Parts

Lists for variable parts, switches, and miscellaneous items.