DOWNLOAD Sony HCD-GZR77D / MHC-GZR77D Service Manual ↓ Size: 4.64 MB | Pages: 98 in PDF or view online for FREE

5  Remove the two solders of motor.

4  MOTOR (TB) board

2  stopper

2  stopper

6  table motor assy (M741)

3 two screws
     (+BTTP (M2.6))

1

4  Remove the two solders of motor.

3  MOTOR (LD) board

1  belt (loading)

5  loading motor assy (M751)

2 two screws
     (+BTTP (M2.6))

1 screw
 (+BVTP 

u6)

2 two screws
 (+BVTP 

u8)

3 two screws
 (+BVTP 

u8)

5 chassis

4

9 two screws
 (+BVTP 

u8)

0 two screws
 (+BVTP 

u8)

qs two screws
 (+BVTP 

u8)

qd screw
 

2 wire (flat type) (9 core)
 (CN1106)

3 wire (flat type) (7 core)
 (CN1104)

8 wire (flat type) (24 core)
 (CN101)

qf bracket (DMB)

5 wire (flat type) (7 core)
 (CN4602)

1 CN1105 (4P)

4 CN1103 (3P)

6 CN601 (9P)

qa DMB19 board

7 CN201 (6P)

1 screw
 (+PTPWH 

2 base unit

1  two insulator screws

3 two insulators

4 two insulators

2  two insulator screws

5  optical pick-up

6  holder (310)

[COLD RESET]
•  The cold reset clears all data including preset data stored in the 

RAM to initial conditions. Execute this mode when returning 
the set to the customer.

Procedure:
1.  Press the [

?/1

] button to turn on the system. 

2.  Press the [

x

] button, [DISC 3] button and [

?/1

] button 

simultaneously.

3.  The message “COLD RESET” appears on the fl uorescent 

indicator tube. Then, the fl uorescent indicator tube becomes 
blank for a while, and the system is reset. 

[COMMON TEST MODE]
•  This mode is used to check operations of the respective section 

of Equalizer level, volume and VACS ON/OFF.

Procedure:
•  To enter Common Test Mode
1.  Press the [

?/1

] button to turn on the system.

2.  Press the [

x

] button, [PRESET EQ] button and [DISC 1] 

simultaneously.

3.  The message “VACS0” appears on the fl uorescent indicator 

tube.

•  Check of Equalizer Level
1.  Press the [EQ BAND/MEMORY] button repeatedly until a 

message “ALL EQ MIN” appears on the fl uorescent indicator 
tube. GEQ decreases to its minimum.

2.  Press the [EQ BAND/MEMORY] button repeatedly until a 
 

message “ALL EQ MAX” appears on the fl uorescent 
indicator tube. GEQ increases to its maximum.

3.  Press the [EQ BAND/MEMORY] button repeatedly until a 
 

message “ALL EQ FLAT” appears on the fl uorescent 
indicator tube. GEQ is set to fl at.

• Check of Volume
1.  Press the [DISPLAY] button repeatedly, the sound volume 

increases to its maximum and message “VOLUME16” t 

“VOLUME MAX” appears on the fl uorescent indicator tube.

2.  Press the [OPTIONS] button repeatedly, the sound volume 

decreases to its minimum and message “VOLUME16” t 

“VOLUME MIN” appears on the fl uorescent indicator tube.

1.  Press the [REC TO USB] button repeatedly until a message 

“VACS OFF” or “VACS ON” appears on the fl uorescent 
indicator tube.

•  To release from Common Test Mode
1.  To release from this mode, press the [

?/1

] button.

2.  To cold reset is enforced at the same time.

[AMP TEST MODE]
•  This mode is used to display the real time VACS level and 

check operations of the respective sections of Equalizer band 
and DBFB ON/OFF.

Procedure:
•  To enter AMP Test Mode
1.  Press the [

?/1

] button to turn on the system.

2.  Press the [

x

] button, [GROOVE] button and [DISC 1] button 

simultaneously.

3.  The message “AMP TEST IN” appears of the fl uorescent 

indicator tube.

•  Check of VACS Display/AMP Adjustment Select
1.  Press the [REC TO USB] button repeatedly until a message 
 

“V0 0 0” appears on the fl uorescent indicator tube. “0” 
represents VACS level which is triggered by signal level.

2.  Press the [REC TO USB] button repeatedly until a message 
 

“D +4 +0 +2” appears on the fl uorescent indicator tube. “+4” 
represents Equalizer Low level, “+0” represents Equalizer 
Mid level and “+2” represents Equalizer High level.

•  Check of Equalizer Band Select
1.  Press the [EQ BAND/MEMORY] button repeatedly until a 

message “LOW +4 dB” appears on the fl uorescent indicator 
tube. EQ Band is set to Low level.

2.  Press the [EQ BAND/MEMORY] button repeatedly until a 

message “MID +0 dB” appears on the fl uorescent indicator 
tube. EQ Band is set to Middle level.

3.  Press the [EQ BAND/MEMORY] button repeatedly until a 

message “HIGH +2 dB” appears on the fl uorescent indicator 
tube. EQ Band is set to High level.

•  Change of Equalizer Band
1.  Press the [EQ BAND/MEMORY] button repeatedly until a 

message “LOW +4 dB” appears on the fl uorescent indicator 
tube. 

2.  When the [OPERATION DIAL] ring is turned clockwise or 

counterclockwise even slightly, “LOW +4 dB” change to 
“LOW –8 dB” y “LOW +8 dB” appears on the fl uorescent 

indicator tube.

3.  Press the [EQ BAND/MEMORY] button repeatedly until a 

message “MID +0 dB” appears on the fl uorescent indicator 
tube.

4.  When the [OPERATION DIAL] ring is turned clockwise 

or counterclockwise even slightly, “MID +0 dB” change to 
“MID –8 dB” y “MID +8 dB” appears on the fl uorescent 

indicator tube.

5.  Press the [EQ BAND/MEMORY] button repeatedly until a 

message “HIGH +2 dB” appears on the fl uorescent indicator 
tube.

6.  When the [OPERATION DIAL] ring is turned clockwise or 

counterclockwise even slightly, “HIGH +2 dB” change to 
“HIGH –8 dB” y “HIGH +8 dB” appears on the fl uorescent 

indicator tube.

•  Check of DBFB ON/OFF Select
1.  Press the [OPTIONS] button repeatedly until a message 

“DBFB OFF” or “DBFB ON” appears on the fl uorescent 
indicator tube.

•  To release from AMP Test Mode
1.  To release from this mode, press the [

?/1

] button.