HCD-GTR333, HCD-GTR555, HCD-GTR777, HCD-GTR888, MHC-GTR333, MHC-GTR555, MHC-GTR777, MHC-GTR888 - Sony Audio Service Manual (repair manual). Page 16

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HCD-GTR333/GTR555/GTR777/GTR888
16
 • 
Procedure:
 
  1.  Press [POWER] button to turn on the system.
 
  2.  Select CD function.
 
  3.  Press [EX-CHANGE] button and [POWER] button 
simultaneously. The system turns off automatically.
 
  4.  Message “MECHA LOCK” is displayed on the 
fl uorescent indicator tube and the CD ship mode is 
set.
[CD  TRAY  LOCK  MODE]
 
•  This mode let you lock the disc tray. When this mode is
activated, the disc tray will not open when [Z  OPEN/
CLOSE] button or [EX-CHANGE] button is pressed. The 
message “LOCKED” will be displayed on the fl uorescent
indicator tube. This mode only applied when there is disc(s)
on the tray.
 • 
Procedure:
 
  1.  Press [POWER] button to turn on the system.
 
  2.  Select CD function.
 
 3.  Press [STOP] button and [ENTER] button si-
multaneously and hold down until “LOCKED” 
or “UNLOCKED” displayed on the fl uorescent 
indicator tube (around 5 seconds).
[FACTORY  PRESET]
 
•  This mode is use to load all the factory use preset 
frequencies into FM 1-FM 20 and AM 1-AM 10. Originally,
frequency of FM 1-FM 20 and AM 1-AM10 are set to the 
minimum frequency.
 • 
Procedure:
 
  1.  Press [POWER] button to turn on the system.
 
 2.  Press [TV] button and [FUNCTION] button 
simultaneously and hold for 3 seconds, message
“FACTORY” appears on the fl uorescent indicator 
tube. The function is changed to TUNER automati-
cally.
[CDM AGING MODE]
 
•  This mode is used to display the total count of meter 
pointer touch initial switch and max switch.
 • 
Procedure:
 
  1.  Press [POWER] button to turn on the system.
 
  2.  Select CD function and All DISC play mode.
 
  3.  Put discs on all trays and close the tray.
  
4. 
Press 
[B ??] button and [EXCHANGE] button
simultaneously for 3 seconds.
  
5. 
The 
fl uorescent indicator tube displays Aging 
Display “AG xxxx/yyyy”.
 
   
“xxxx” represents the error counter
 
   
(Maximum Value of “xxxx” = 9999)
 
   
“yyyyy” represents the cycle counter
 
   
(Maximum Value of “yyyy” = 9999)
 
6. 
Press [<<] or [>>] to search for Aging History 
Error Display.
 
   
The fl uorescent indicator tube displays “Mx E1E2E3E4”.
 
   
x: error history number
 
   
E1: Loading sequence JCP high
 
   
E2: Loading sequence JCP low
 
   
E3: Loading operation JCP
 
   
E4: Cam position operation JCP
 
  7.  Press [ENTER] to Aging Display.
 
•  To release from CDM Aging Mode.
 
  To release from this mode, press [POWER] button or 
perform COLD RESET operation.
SECTION  4
ELECTRICAL  CHECK
FM  AUTO  STOP  CHECK
signal
generator
set
+
75 
Procedure:
1.  Turn the power on.
2.  Input the following signal from Signal Generator to FM 
antenna input directly.
Carrier frequency : A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation 
: 75 kHz
Modulation 
: 1 kHz
ANT input 
: 35 dBu (EMF)
Note: 
Please use 75 ohm “coaxial cable” to connect SG and the 
set. You cannot use video cable for checking.
 
  Please use SG whose output impedance is 75 ohm.
3.  Set to FM tuner function and scan the input FM signal with 
automatic scanning.
4. Confi rm that input Frequency of A, B and C detected and 
automatic scanning stops.
The stop of automatic scanning means “The station signal is 
received in good condition”.
TUNER  SECTION
0 dB = 1 μV
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