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Sherwood RV-4050R Service Manual

Sherwood RV-4050R
27 pages
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SERV.
A455
SERVICE
MANUAL
|
RV-4050R
AUDIO/VIDEO
PRO-LOGIC
RECEIVER
Qsherwood
DTeMLIMNE
M
AUDIO.
VIDEO
MECEIVER
Rv
40508
CONTE
Safety
PrecautiOnS--------+-s
see
ee
2
Specifications
A
3
Wirtng
Diagram
LULL.
7
Block
Diagram
BO
9
Circuit
Description
---------e
rt
11
Alignment
Procedures
=
2...
7
Troubleshooting
-----:---.--e
ester
20
G
Sherwood
NTSs
Mechanical
Parslist
=
=
==
=
=
=
==
28
Exploded
View...
cect
25
Printed
Circuit
BoardS-----t
27
Electrical
Parts
List
<=
32
IC'S
Lead
Identifications
&
Internal
Diagram
---38
Transistors
Lead
Identification
--------
43
Schematuc
Dieagramsti
[1
il)
45
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Sherwood RV-4050R Specifications

General IconGeneral
Channels2
Frequency Response20Hz to 20kHz
Signal to noise ratio95dB (line)
Weight9.5 kg
Tuning rangeFM, AM
Input sensitivity150mV (line)
OutputHeadphones
Power Output100 watts per channel into 8Ω (stereo)

Summary

Safety Precautions

Specifications

Audio Section-Front (Mode: Normal)

Specifies performance for normal audio output, including power and distortion limits.

Audio Section-Front (Mode: Dolby-logic)

Details Dolby-logic mode specifications for audio output power and signal-to-noise ratio.

Audio Section-Center

Lists specifications for the center audio channel output, including power and noise levels.

Audio Section-Rear

Provides specifications for the rear audio channels, focusing on output power and noise.

General Specifications

Covers general specifications like speaker load impedance and power consumption.

FM Section Specifications

Outlines detailed technical specifications for the FM tuner section.

MPX Section Specifications

Details specifications related to the multiplex (MPX) stereo decoding section.

AM Section Specifications

Lists technical specifications for the AM tuner section, including sensitivity and selectivity.

Wiring Diagram

Block Diagram

Circuit Description

IC501 Microprocessor Details

Describes the pin configuration and function of the main microprocessor IC501.

Alignment Procedures

Equipment Required for Alignment

Lists the necessary test equipment for performing alignment procedures.

Tuner Alignment Test Points

Identifies specific test points on the tuner PC board for alignment.

AM IF and RF Alignment

Details the steps for aligning the AM Intermediate Frequency (IF) and Radio Frequency (RF) stages.

FM IF Alignment

Outlines the procedure for aligning the FM Intermediate Frequency (IF) stage.

MPX Alignment

Describes the steps for aligning the FM Multiplex (MPX) section.

Troubleshooting

Receiver Inoperative Issues

Addresses issues where the receiver is dead and the front light indicator is off.

Power Supply and Fuse Problems

Covers troubleshooting steps when the main fuse repeatedly blows upon power-up.

No Sound from Channels

Explains causes and remedies for no audio output on either channel when the FL indicator is lit.

Single Channel Audio Failure

Details troubleshooting for a single dead audio channel, tested with a signal at the volume control.

Headphone Output Issues

Diagnoses problems where speakers function but headphone output is dead.

FM Reception Problems

Provides solutions for when the FM reception or playback is not functioning.

Poor Stereo Separation

Addresses issues with weak stereo separation in FM reception.

STEREO Indicator Not Lighting

Troubleshoots why the stereo indicator fails to illuminate during FM reception.

Low FM Volume

Covers causes for low or insufficient volume specifically from the FM tuner section.

FM Mono Functionality

Addresses issues where the FM mono selection switch does not alter the audio output.

AM Inoperative

Provides troubleshooting steps for when the AM tuner section fails to operate.

Tone Control Issues

Diagnoses problems where bass or treble tone controls are unresponsive.

Tuning Functionality Problems

Explains why automatic or manual tuning functions might fail.

Display and Remote Control Issues

Covers troubleshooting for a non-functional FL display and remote control unit.

Mechanical Parts List

Included Accessories

Lists included accessories such as antennas, batteries, and manuals.

Cabinet and Chassis Components

Details parts related to the unit's physical enclosure and structural components.

Exploded View

Printed Circuit Boards

IC Lead Identification and Diagrams

GD4066B Microprocessor Details

Provides pinout and internal diagram for the GD4066B IC, used for switches.

OP AMP IC Details

Details lead identification and block diagrams for OP AMP ICs like KIA4559P.

LA1266 IC Details

Shows the package outline and block diagram for the LA1266 IC.

LM7001 IC Details

Provides the package outline and block diagram for the LM7001 IC.

NJM2177L IC Details

Details pinout and block diagram for the NJM2177L IC, likely audio processing.

TC9176P IC Details

Shows lead identification and block diagram for the TC9176P IC.

LC7821 IC Details

Provides lead identification and block diagram for the LC7821 IC.

KA2265 IC Details

Details pinout and block diagram for the KA2265 IC, related to FM/AM tuning.

NJU9701 IC Details

Shows pinout and block diagram for the NJU9701 IC, likely for digital delay.

Transistor Lead Identification

KTB688/KTD718 Transistor Leads

Identifies lead configurations for KTB688/2SB688 and KTD718/2SD718 transistors.

KTB1367/KTD2059 Transistor Leads

Shows lead identification for KTB1367/2SB1367 and KTD2059/2SD2059 transistors.

2SC4137 Transistor Leads

Details the front and bottom view lead identification for the 2SC4137 transistor.

KTA/KTC/KTD Series Transistors

Lists lead identification for several KTA, KTC, and KTD series transistors.

KTC114YS/KTA114YS Transistor Leads

Identifies lead configurations for KTC114YS and KTA114YS transistors.

KTA949/KTC2229 Transistor Leads

Shows lead identification for KTA949/KTA1024 and KTC2229/KTC3206 transistors.

2SK117 Transistor Leads

Details the lead identification for the 2SK117 transistor.

Schematic Diagram I

Schematic Diagram II

Schematic Diagram III

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