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Model
HCD-GNX66 HCD-GNX77 MHC-GNX66 MHC-GNX77
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77
Size
5.56 MB
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PDF
Document
Service Manual
Brand
Device
Audio
File
hcd-gnx66-hcd-gnx77-mhc-gnx66-mhc-gnx77.pdf
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Sony HCD-GNX66 / HCD-GNX77 / MHC-GNX66 / MHC-GNX77 Service Manual ▷ View online

17
HCD-GNX66/GNX77
SECTION 4
TEST MODE
[GC TEST  MODE]
• This mode is used to check the fluorescent indicator tube,
LEDs, keys, MASTER VOLUME jog, OPERATION
DIAL jog, AMS jog, destination, software version and
VACS level.
Procedure:
1. Press 
x
 button, [ENTER] button and [DISC 2]  button
simultaneously.
2. All LEDs and segments in fluorescent indicator tube are lighted
up. All LEDs are lighted up in red color. If the system is turned
on, the `/1 LED is lighted up in green color.
3. When you want to enter the software version display mode,
press [DISC 1] button. The model and destination are displayed.
4. Each time [DISC 1] button is pressed, the display changes from
MC version, GC version, SYS version, CD version, CDDM
version, CDMA version, CDMB version, BDA version, BDB
version, ST version, TC version, TA version and TM version
in this order, and returns to the MC version display.
5. When [DISC 3] button is pressed while the version numbers
are being displayed except model and destination, the date of
the software creation appear. When [DISC 3] button is pressed
again, the display returns to the software version display. When
[DISC 1]  button is pressed while the date of the software
creation is being displayed, the date of the software creation
is displayed in the same order of software version display.
6. Press [DISC 2] button, the key check mode is activated.
7. In the key check mode, the fluorescent indicator tube displays
“K 0 J0V0E0 X0”.
Each time a button is pressed, “K” value increases. However,
once a button has been pressed, it is no longer taken into
account.
“J” value increases in the manner of 0, 1, 2, 3 ... if
[OPERATION DIAL] knob is turned clockwise, or it decreases
in the manner of 0, 9, 8, 7 ... if [OPERATION DIAL] knob is
turned counter-clockwise.
“V” value increases in the manner of 0,1, 2, 3 ... if [VOLUME]
knob is turned clockwise, or it decreases in the manner of 0,
9, 8, 7  ... if [VOLUME] knob is turned counter-clockwise.
“E” value increases in the manner of 0,1, 2, 3... if  
.>
knob is turned clockwise, or it decreases in the manner of 0,
9, 8, 7 ... if  
.>
 knob is turned counter-clockwise.
8. When [DISC 3] button is pressed after all LEDs and segments
in fluorescent indicator tube light up, the fluorescent indicator
tube displays “VACS A+B APCC”. A is VACS level which is
triggerd by signal level, B is VACS level which is triggerd by
temperature and CC is VACS level which is triggerd by
APVACS (Abuse Protection VACS).
The signal level, which will trigger VACS A is shown in the
center area of fluorescent indicator tube.
9. When  [EX-CHANGE/DISC SKIP]  button is pressed after all
LEDs and segments in fluorescent indicator tube light up,
alternate segments in fluorescent indicator tube would light
up. If you press [EX-CHANGE/DISC SKIP] button again, another
half of alternate segments in fluorescent indicator tube would
light up.  Pressing [EX-CHANGE/DISC SKIP]  button again
would cause all segments lights up.
10. To release this mode, press three buttons in the same manner
as step 1, or disconnect the power cord.
[MC  TEST  MODE]
• This mode is used to check operations of the respective sections
of Amplifier, Tuner, and Tape.
Procedure:
*   To enter MC Test Mode
1. Press 
x
 button, [ENTER] button and [DISC 3] button
simultaneously.
2. The CD ring indicators, TAPE A and TAPE B indicators flash
on the fluorescent indicator tube. The function is changed to
VIDEO.
* Check of Amplifier
1. Press  [EQ BAND]  button repeatedly until a message “GEQ
MAX” appears on the fluorescent indicator tube. GEQ
increases to its maximum.
2. Press  [EQ BAND]  button repeatedly until a message “GEQ
MIN” appears on the fluorescent indicator tube. GEQ decreases
to its minimum.
3. Press  [EQ BAND]  button repeatedly until a message “GEQ
FLAT” appears on the fluorescent indicator tube. GEQ set to
flat.
4. When the [MASTER VOLUM] knob is turned clockwise even
slightly, the sound volume increases to its maximum and a
message “VOLUME MAX” appears on the fluorescent
indicator tube.
5. When the [MASTER VOLUM] knob is turned counter-clockwise
even slightly, the sound volume decreases to its minimum and
a message “VOLUME MIN” appears on the fluorescent
indicator tube.
* Tape function
1. When a tape is inserted in Deck B and recording is started, the
function is changed to VIDEO automatically. When [CD SYNC]
button is pressed during recording in function, ALC (Automatic
Level Control) is turned on.
2. During recording, turn  
m M
  knob to counter clockwise
rotation will change the function to TAPE B and rewind  until
the recording start position and playback of is started. If the
[REC PAUSE/ START]  button is pressed for a pause and pressed
again to resume recording during recording time, when tape
deck B is rewind, tape deck B will be rewind until the position
where the pause is applied.
* To release MC Test mode.
1. To release this mode, press  
`/1
  button.
2. The cold reset is enforced at the same time.
[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 
x
  button,  [ENTER]  button, and 
`/1 
button simul-
taneously.
2. The fluorescent indicator tube becomes blank for a while, and
the set is reset.
18
HCD-GNX66/GNX77
[VACS ON/OFF]
• This mode is used to switch ON and OFF the VACS (Variable
Attenuation Control System).
Procedure:
1. Press  
`/1
  button to turn the set ON.
2. Press 
x
 button and [ILLUMINATION] button simultaneously.
The message “VACS OFF” or “VACS ON” appears on the
fluorescent indicator tube.
[TUNER STEP CHANGE]
• The step interval of AM channels can be toggled between 9
kHz and 10 kHz.
Procedure:
1. Press  
`/1  
button to turn the set ON.
2. Press [TUNER/BAND] button repeatedly to select the “AM”.
3. Press  
`/1  
button to turn the set OFF.
4. Press [ENTER] button and  
`/1  
button simultaneously. The
system will turn ON automatically. The message “AM 9k
STEP” or AM 10k STEP” appears on the fluorescent indicator
tube and thus the channel step is changed.
[CD SERVICE MODE]
• This mode let you move the CD sled motor freely. Use this
mode when you want to clean the optical pick-up.
Procedure:
1. Press  
`/1
  button to turn the set ON.
2.  Select CD function.
3. Press  
x   
,  [ENTER]  button, and  
Z  OPEN/CLOSE
    button
simultaneously.
4. The CD service mode is activated. The message “SERVICE
MODE” appears.
5. With the CD in stop status, turn  
m M  
knob to clockwise
rotation to move the optical pick-up to outside track, or turn
m M  
knob to counterclockwise rotation to move to inside
track. The message “SLED OUT” or “SLED IN” appears on
the fluorescent indicator tube.
6. To turn on or off the laser, press [DIRECTION]  button. The
message “LASER ON” or “LASER OFF” appears on the
fluorescent indicator tube.
7. To release this mode, press  
`/1  
button.
[AGING MODE]
This mode can be used for operation check of CD section.
• If an error occurs, the aging operation would stops and the
status is displayed.
• If there are no error occurs, the aging operation would
continues repeatedly.
Procedure:
1.  Press  
`/1
  button to turn the set ON
2. Select CD function.
3. Load three discs on the disc tray.
4. Press  [PLAY MODE]  button repeatedly to select the “ALL
DISCS” mode, and press the [REPEAT] button repeatedly to
select “REPEAT OFF” mode.
5. Press  
x
  button, [ENTER] button, and [EX-CHANGE/DISC SKIP]
button simultaneously.
6. Aging operation is started.
7. To release this mode, press  
`/1
  button or disconnect the power
cord to turn the power OFF.
Aging mode sequence:
Start (from disc 1)
Disc chucking
TOC reading
Play first track for 2 seconds
Play last track for 2 seconds
EX-CHANGE open/close
Open the disc tray
Disc skip
Close the disk tray
Change the next disc
19
HCD-GNX66/GNX77
• Display when an error occurred (CD Error Code Mode)
Procedure:
1. Press 
x
  button,  [ENTER]  button and [DISC 1]  button
simultaneously to enter the error code display mode.
2. The fluorescent indicator tube displays the number of total
error.
3. Each time  
m M
  knob is rotated, display change as below.
Display of total error
> +
direction
– .
direction
Display of Mechanical errors
> +
direction
– .
direction
Display of no disc errors
4. To clear the error record, operate the cold reset. (Refer to the
“COLD RESET”)
5. To release this mode, press the  
`/1
  button or disconnect the
power cord to turn the power OFF.
1) Display of total error
EM**: The number of mechanical errors.
ED**: The number of no disc errors after chucking the disc.
2) Display of mechanical errors
M*: The number of mechanical error (“00” is latest one)
(Rotate  
.>
  knob in the direction of either to display next
error)
$$: Not used
%%: Loading related error (Second figure is not used)
D: Stop by the problem other than mechanical problem while
closing.
E: Stop by the problem other than mechanical problem while
opening.
C: Stop by the problem other than mechanical problem while
chucking up.
F: Stop by the problem other than mechanical problem while
chucking down.
&&: Emerging error
01: Stop while chucking up.
02: Stop while chucking up.
03: Time-out of EX-CHANGE open.
05: Time-out of EX-CHANGE close.
##: Not used
Display
M*$$%%&&##00
Display
D*$$%%&&##00
Display
Em**Ed**
3) Display of no disc errors
D*: The number of mechanical error (“00” is latest one)
(Rotate  .>  knob in the direction of either to display next error)
$$: Error type
01:
Focus error
02:
GFS error
03:
Setup error
%%: Not used
&&:
00:
No disc judgment without chucking retry.
01:
No disc judgment after chucking retry.
##: The state when judged as no disc
01:
Stop
02:
Setup
03:
TOC reading
04:
Access
05:
Playback
06:
Pause
07:
Manual search (Play)
08:
Manual search (Pause)
[CD REPEAT 5 LIMIT OFF MODE]
• The number of repeat for CD playback is 5 times when the
repeat mode is “REPEAT ALL”. This mode enables CD to
repeat playback for limitless times.
Procedure:
1. Press  
`/1
  button to turn the set ON.
2. Select CD function.
3. Press  
x
  button, [CD] button and [DISC 1] button
simultaneously to enter the CD repeat 5 limit off mode and
the fluorescent indicator tube, the message “LIMIT OFF”
appears.
4. To release this mode, operate the cold reset. (Refer to the
“COLD RESET”)
[CD SHIP MODE (WITH MEMORY CLEAR)]
• This mode moves the optical pick-up to the position durable
to vibration and clears all data including preset data stored in
the RAM to initial conditions. Use this mode when returning
the set to the customer after repair.
Procedure:
1. Press  
`/1
  button to turn the set ON.
2. Select CD function.
3. Press 
x
  button,  [CD]  button and   
`/1
    button simultaneously.
The set will power off automatically.
4. After the “STANDBY” blinking display finish, a message
“LOCK” appears on the fluorescent indicator tube and the
CD ship mode is set.
20
HCD-GNX66/GNX77
[CD TRAY LOCK MODE]
• This mode let you lock the disc trays. When this mode is
activated, the disc tray will not open when  
Z OPEN/CLOSE
button or [EX-CHANGE/DISC SKIP]  button is pressed. The
message “LOCKED” appears on the fluorescent indicator tube.
Procedure:
1. Press  
`/1  
button to turn the set ON.
2. Select CD function.
3. Press  
x
  button and  
Z OPEN/CLOSE
  button
simultaneously and hold down until “LOCKED” or
“UNLOCKED” appears on the fluorescent indicator tube
(around 5 seconds).
 [VIDEO/MD SWITCHING]
• This mode let you switch from VIDEO to MD and vice-versa.
Procedure:
1. Press  
`/1  
button to turn the set ON.
2. Select VIDEO function.
3. Press [VIDEO/MD] button and  
`/1  
button simultaneously.  The
function will change to MD. Press the same buttons again to
change from MD to VIDEO.
[REMOTE COMMANDER DISABLE MODE]
• This mode let you disable the remote commander reception.
When this mode is activated, the set will not response if the
button on the remote commander is pressed. The message
“RemoteDisable” will be displayed on the fluorescent indicator
tube. Use this mode during aging to avoid disturbance.
• Procedure:
1. Press  
x
  button, [GROOVE] button and [DISC 2] button
simultaneously.
The message “RemoteDisable” appears on the fluorescent
indicator tube. To enable the remote commander reception,
press the same buttons again.
The message “RemoteEnable” appears on the fluorescent
indicator tube.
[CD SHIP MODE (WITHOUT MEMORY CLEAR)]
• This mode moves the optical pick-up to the position durable
to vibration. Use this mode when returning the set to the
customer after repair.
Procedure:
1. Press  
`/1 
 button to turn the set ON.
2. Select CD function.
3. Press  [CD]  button and  
`/1  
button simultaneously. The set
will power off automatically.
4. After the “STANDBY” blinking display finish, the message
“LOCK” appears on the fluorescent indicator tube and the
CD ship mode is set.
[CD POWER MANAGE]
• This mode let you switch on or off, the power supply to the
BU during TUNER function.
•  When CD POWER is set to OFF, the power supply to the BU
is cut off during TUNER function. It will increase the time
taken to access CD when function change from TUNER to
CD but it will improve tuner reception.
• When CD POWER is set to ON, the power supply to the BU
is not cut off during TUNER function. It will reduce the time
taken to access CD when function change from TUNER to
CD but it will decrease tuner reception performance.
Procedure:
1.  Press  
`/1  
button to turn the set ON.
2. Select CD function.
3. Press  
`/1  
button to turn the set OFF.
4. Press  
x
  button and  
`/1  
button simultaneously. The set will
power on automatically.
5. The message “CD POWER ON” or “CD POWER OFF”
appears on the fluorescent indicator tube.
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