HCD-ECL77BT, HCD-ECL99BT - Sony Audio Service Manual (repair manual). Page 5

DESTINATION  ABBREVIATIONS
The following abbreviations for model destinations are used in this 
service manual.

• Abbreviations
 AR  : 

Argentina 

model

  BR 

: Brazilian model

  CND  : Canadian model
  E2 

: 120V AC area in E model

  E4 

: 220 – 240V AC area in E model

  E51 

: Chilean and Peruvian models

  E93 

: 240V AC area in E model

  MX 

: Mexican model

  RU 

: Russian model

CAPACITOR  ELECTRICAL  DISCHARGE  PROCESSING
When checking the board, the electrical discharge is necessary for 
the electric shock prevention.
Connect the resistor to both ends of respective capacitors.

• POWER 

Board

 CE503, 

CE504

:/2 W

:/2 W

ABOUT  PARTS  REPAIR  OF  EACH  BOARDS
When each boards installed in this unit are defective, individual 
electrical parts that the mount is done cannot be replaced. When 
each boards are defective, replace the mounted board or  the whole 
parts including an applicable board.
Printed wiring board and Schematic diagram that have been de-
scribed on this service manual are for reference.

NOTE  THE  REPLACING  OF  MAIN  BOARD  OR  NFC  
MODULE
When replacing the MAIN board or the NFC module, be sure re-
place both at the same time.
The MAIN board or the NFC module cannot replace with single.

TEST  DISCS
Use following TEST DISC (for CD) when this unit confi rms the 
operation and checks it.

Part No.

   

Description

3-702-101-01 DISC 

(YEDS-18), 

TEST

4-225-203-01 DISC 

(PATD-012), 

TEST

RELEASING  THE  DISC  TRAY  LOCK
The disc tray lock function for the antitheft of sample disc in the 
shop is equipped.

Releasing Procedure:
1.  Press the [

?/1

] button to turn the power on.

2.  Press two buttons of the [x] and [Z] simultaneously for fi ve 

seconds.

3.  The message “UNLOCKED” is displayed on the fluorescent 

indicator tube and the disc tray is unlocked.

Note: When “LOCKED” is displayed, the disc tray lock is not released by 

turning power on/off with the [?/1] button.