Sony XR-4803 service manual Source and Mode button MW, AM MW Auto Scan/Stop Level Adjustment

Page 16

AM (MW) Auto Scan/Stop Level Adjustment

Adjustment Location:

Make this adjustment after “FM Auto Scan/Stop Level Adjustment”.

 

Setting:

—SET UPPER VIEW–

[SOURCE] and [MODE] button: MW

Tape Speed Adjustment

 

AM RF signal

generator

AM dummy antenna (50 Ω)

Carrier frequency

: 999 kHz

30% amplitude

 

modulation by

 

1 kHz signal

: 33 dB (44.7 V)

Output level

30 Ω 15 pF

65 pF

set

antenna jack (J1)

TU1

Procedure:

1.Set to the test mode. (See page 14.)

2.Push the [SOURCE] button and set to FM.

3.Push the [MODE] button and set to MW.

INTRO

SHUF1

Display

MW 999￿

4.Adjust with the volume RV1 on TU1 so that the “MW” indi- cation turns to “MWI” indication on the display window. But, in case of already indicated “MWI”, turn the RV1 so that put out light “I” indication and adjustment.

RV4 FM Stereo Separation Adjustment

 

Display

RV2 FM Auto Scan/Stop Level Adjustment

 

 

 

999

RV1 AM (MW) Auto Scan/Stop Level Adjustment

 

 

INTRO

￿

 

SHUF1

 

 

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Contents Specifications XR-4803Diagrams Table of ContentsFlexible Circuit Board Repairing Section General Page Page Page Page Page Front Panel ASS’Y Section DisassemblyCover ASS’Y SUB PANEL, Mechanism Deck MG-25F-136 Main BOARD, Heat SinkSection Assembly of Mechanism Deck HousingLever LDG-A / LDG-B Gear LDG-FTGuide C Section Electrical Adjustments Section Mechanical AdjustmentsTape Deck dB=0.775 FM Auto Scan/Stop Level Adjustment Tuner dB=1 µVSource and Mode button MW AM MW Auto Scan/Stop Level AdjustmentIC PIN Function Description Section DiagramsPin No Pin Name Function REL Uniso Page Page Page IC331 LC75373ED IC Block Diagrams Main Board IC301 CXA2509AQ-T4IC351 IC611 BA3918-V2 Chassis Section Section Exploded Views1211 Front Panel Section 102108 107 105 111 121 114 112 104 103 113 101 117 116 106 115 118Mechanism Deck Section MG-25F-136 159 158 155 154 157 156 153 152 168 151 160 163 161162 164 165 168 166 167Section Electrical Parts List KEYKEY Main Double Layer Inductor Tuner TU1 502 501 503504 505 Screw +BXR-4803