Sherwood AVP-8500G User Manual

SERVICE MANUAL
_ AVP-8500G/B
AUDIO/VIDEO
SURROUND
PRE
AMPLIFIER
AUDIO/ VIDEO SURROUND
GSherwood PRE AMPLIFIER AVP 65006
"ALPHA NUMERIC: MULT! FUNCTION CESPLAY/ ONE 877 TIME UAK OXGITAL DELAY
PRO LOGIC - TIME LINK
TAPER MON = TAPE OCC Aux TUNER
CONTENS
Safety PHOCAUTIONS --seesreeeeceeeeseeseereetnneeeeceneeeereeeeseeersees 2 Block Diagram sadasedosdbedssnsssesuauedscusdcseuwerudadsasede tine teeecege 19
Specifications--------ee eects terest teeter terse 3 Wiring Diagraim-----:resserssereeieereeeterete te teeetesceees a1
Circuit Description --:-----eeeeeeeereecteestestesees ees etenecnees 4 Electrical Parts List------------:::e:eeesceeceseeeeeeeessneeeeeneeeenenes 23
Troubleshooting sevbescenoveesenccctessssecvecsseesnnaessscaseeasccasssesoese 8 Semiconductor Lead Identification
Mechanical Parts Lists--:---:ssecsecceeseseeeessesssesesnecsses 10 & Internal Diagrarmse------s-s---sesssssseseseeeerreesssseeee 30
EExDlOcead Viewessssssesssssecssccsssceneceenasiunsnanansnnonedboossenees 11 Transistors Lead Identification... 36
Printed Circuit BOardS.----------s cree eeeereeeereeeteeeneeeneees 13 Schematic Diagrams iunuesewevdpeadcsseenys sagenaddaeticsendacacwecesse 37
§ Sherwood
26S

Sherwood AVP-8500G Specifications

General

Brand	Sherwood
Model	AVP-8500G
Category	Amplifier
Language	English

Summary

Safety Precautions

WARNING

General safety warnings for servicing procedures.

AC Leakage Current Check

Procedure for checking AC leakage current for safety compliance.

Specifications

Front Section Specifications

Technical specifications for the front audio output section.

Center Section Specifications

Technical specifications for the center speaker output section.

Rear Section Specifications

Technical specifications for the rear speaker output section.

General Specifications

General technical data including power, dimensions, and weight.

Circuit Description

IC501: μPD75212ACW-A81 Pin Assignment

Detailed pinout and function for the main control IC.

Block Diagram

Overview of the unit's functional blocks and signal flow.

Pin Functions

Comprehensive explanation of the IC501 pin functions and modes.

Troubleshooting

Amplifier Inoperative

Steps to diagnose and fix an inoperative amplifier section.

Not Operating Protection

Diagnosis and remedy for protection circuit failures.

Fuse Blows on Power-On

Troubleshooting steps when the unit blows the fuse upon power application.

No Sound from Channels

Steps to resolve issues with no audio output from channels.

Speaker Specific Issues

Troubleshooting for center and rear speaker inoperability.

Audio Input/Output Problems

Diagnosis for PHONO input, headphone, and volume control noise.

Front Display (FL) Inoperative

Steps to resolve issues with the front panel display not functioning.

Remote Control Inoperative

Troubleshooting steps for a non-functional remote control.

Mechanical Parts List

PACKAGE

List of packaging materials used for the product.

ACCESSORIES

List of included accessories provided with the unit.

CABINET

List of mechanical parts related to the unit's chassis and enclosure.

Exploded View

Printed Circuit Boards

Block Diagram

Wiring Diagram

Electrical Parts List

Semiconductor Lead Identification & Internal Diagram

TC9176P: IC408 (Electical Volume)

Lead identification and internal diagram for the TC9176P IC.

MC14094BCP: IC106, IC107, IC403 (8-Stage shift/store Register with Tri-state Outputs)

Lead identification and block diagram for the MC14094BCP IC.

NJM2068DD: IC101 (High performance dual low noise operational amplifier)

Lead identification and block diagram for the NJM2068DD amplifier IC.

BA7625: IC102(Video signal switch for AV Amplifier)

Internal diagram for the BA7625 video switching IC.

LC7821: IC803, IC804 (Analog Function Switch)

Lead identification and block diagram for the LC7821 IC.

LC7822: IC105 (Analog Function Switch)

Lead identification and block diagram for the LC7822 IC.

GL7815: IC801 (Requlator)

Regulator IC details including diagram and circuit.

GL7915: IC802(Regulator)

Regulator IC details including diagram and circuit.

KIA4559/KTA75559P: IC103, IC109, IC402, IC406, IC409, IC110 KIA6259P (OP Amprifier)

Equivalent circuit for KIA4559 and KIA6259P amplifier ICs.

MC14066BCP: IC111, IC401, IC407 (Quad analog switch)

Circuit schematic and logic diagram for the MC14066BCP IC.

STK4192: IC112 (2 Channel 50W AF amplifier)

Block diagram for the STK4192 audio amplifier IC.

SSM2126A: IC104

Block diagram for the SSM2126A audio processor IC.

TA7291S: IC601

Block diagram for the TA7291S audio amplifier IC.

TRANSISTORS LEAD IDENTIFICATION

Identification and lead pinouts for common transistors.

Schematic Diagrams I

Schematic Diagrams II

Schematic Diagrams III