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XM-222MK2
Ver 1.1
PROTECTOR OPERATION CHECK
Thermal Protect
1. Short across TH801 with the power on.
2. Verify that the protector is operated and LD801 illuminates red.
3. Verify that the protector is released and LD801 illuminates green
when the short is removed.
4. Likewise, perform items 1 to 3 for TH802.
Over Current Protect
1. Short between the positive and negative sides of the speaker
output terminal CN802 with the power on.
(Perform this shorting for each channel on L and R.)
2. Verify that the protector is operated and LD801 illuminates red.
3. Verify that the protector is not released and LD801 remains red
even when the short is removed.
4. Verify that the protector is released and LD801 illuminates green
when the power is turned off and then on again.
Offset Protect
1. Short between the +12V terminal of CN801 and the BTL+ or
BTL- of the speaker output terminal CN802.
(Short between +12V terminal and BTL+ and between +12V
terminal and BTL-.)
2. Verify that the protector is operated and LD801 illuminates red.
3. Verify that the protector is not released and LD801 remains red
even when the short is removed.
4. Verify that the protector is released and LD801 illuminates green
when the power is turned off and then on again.
Chassis Short Protect
1. Short between the +12V terminal of CN801 and the chassis with
the power on.
2. Verify that the pilot lamp PL801 goes on.
3. Verify that PL801 goes off when the short is removed.
2
TABLE OF CONTENTS
1. GENERAL
Connections ............................................................................. 3
2-1. Bottom Plate ........................................................................ 5
2-2. Heat Sink ............................................................................. 6
2-3. Amp Board .......................................................................... 6
3-1. Block Diagram .................................................................... 7
3-2. Printed Wiring Board .......................................................... 8
3-3. Schematic Diagram ............................................................. 9
........................................................... 10
Notes on Chip Component Replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE
WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0 SUR LES
DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
......................................... 11
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