DOWNLOAD Sony HCD-GN70V / MHC-GN70V Service Manual ↓ Size: 5.23 MB | Pages: 79 in PDF or view online for FREE

Model
HCD-GN70V MHC-GN70V
Pages
79
Size
5.23 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
hcd-gn70v-mhc-gn70v.pdf
Date

Sony HCD-GN70V / MHC-GN70V Service Manual ▷ View online

17
HCD-GN70V
SECTION 4
TEST MODE
[GC TEST  MODE]
• This mode is used to check the fluorescent indicator tube, LED,
model, destination, software version, volume, key and VACS
level.
Procedure:
1. Press 
x
  button, 
[AMP MENU
]  button and 
[DISC 2]
    button
simultaneously.
2. All LEDs and segments in fluorescent indicator tube are lighted
up.
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, CD version,  ST version, TA version,
TM version and TC 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   V 0”.
Each time a button is pressed, “K” value increases. However,
once a button has been pressed, it is no longer taken into account.
“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.
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”. A is VACS level which is trigger
by signal level while B is VACS level which is trigger by thermal.
Total VACS value would be the sum of A and B.
9. When 
[DISC SKIP/EX-CHANGE]
  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 
[DISC SKIP/EX-CHANGE]
 button again, another
half of alternate segments in fluorescent indicator tube would
light up.  Pressing 
[DISC SKIP/EX-CHANGE]
  button again
would case 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, 
[AMP MENU]
  button and 
[DISC 3]
  button
simultaneously.
2. The TAPE A and TAPE B segments flash on the fluorescent
indicator tube. The function is changed to VIDEO.
* Check of Amplifier
1. When  
V
  button is pressed, GEQ increases to its maximum and
a message “GEQ MAX” appears on the fluorescent indicator
tube.
2. When  
v
  button is pressed, GEQ decreases to its minimum and
a message “GEQ MIN” appears on the fluorescent indicator
tube.
3.  When  
B
  button or  
b
  button is pressed, GEQ is set to flat and
a message “GEQ FLAT” appears on the fluorescent indicator
tube.
4. When the 
[VOLUME]
 knob is turned clockwise even slightly,
the sound volume increases to its maximum and a message
“VOLUME MAX” appears for two seconds, then the display
returns to the original display.
5. When the 
[VOLUME]
 knob is turned counter-clockwise even
slightly, the sound volume decreases to its minimum and a
message “VOLUME MIN” appears for two seconds, then the
display returns to the original display.
* Check of clock frequency
1. To check the frequency of clock used to run the clock of the
system, the clock output is available at IC501 pin ek (CLOCK-
OUT) on the MAIN board during MC test mode.
2. The frequency is 32.768 kHz.
* 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
Logic Control) is turned on.
2. After recording is stopped by pressing 
 x
  button, press 
m
button will change the function to TAPE B and rewind Tape
B until the recording start position and playback of Tape B 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.
* AMS Test Mode
1. Select the function “TAPE A” or “TAPE B”.
2. Select Loop or Relay direction mode by pressing the
[DIRECTION]
 button. Insert a test tape AMS-110A or AMS-
120 to selected tape deck.
3. Press the 
[AMP MENU]
 button to enter the AMS test mode.
4. After the test tape is rewind to the beginning of the tape, the
AMS+ is checked, and the mechanism is shut off after detecting
the AMS signal twice.
5. Then the AMS- is checked and the mechanism is shut off after
detecting the AMS signal twice.
6. When the check is complete, a message of either OK or NG
appears.
* To release MC Test mode.
1. To release this mode, press 
?/1
 button.
2. The cold reset is enforced at the same time.
18
HCD-GN70V
[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, 
[AMP MENU]
  button, and 
?/1
  button
simultaneously.
2. The fluorescent indicator tube becomes blank for a while, and
the set is reset.
[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 
[AMP MENU]
  button and 
[GAME MIXING]
  button
simultaneously. The message “VACS OFF” or “VACS ON”
appears.
[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 to select the “AM”.
3. Press 
?/1
 button to turn the set OFF.
4. Press 
[AMP MENU]
 button and 
?/1
 button simultaneously.
The system will turn ON automatically. The message “AM 9k
STEP” or AM 10k STEP” appears and thus the channel step is
changed.
[CD SERVICE MODE & MPEG AV TEST MODE]
• CD Service mode let you move the CD sled motor freely. Use
this mode when you want to clean the optical pick-up. MPEG
AV test mode let you check the color of video  signal.
Procedure:
1. Press 
?/1
 button to turn the set ON.
2. Select CD function.
3.Press  
x
  button, 
[AMP MENU]
 button, and 
Z
OPEN/CLOSE
button simultaneously.
4. The MPEG AV test mode is activated. The message “MPEG
AV TEST” appears.
5. Press 
[PLAY MODE]
 button . The CD service mode is activated.
The message “SERVICE MODE” appears.
6. With the CD in stop status, press 
M
 button to move the
optical pick-up to outside track, or press 
m
 button to move
to inside track. The message “SLED OUT” or “SLED IN”
appears.
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 sta-
tus 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 to select the “ALL DISCS” mode,
and press the 
[REPEAT]
 button to select “REPEAT OFF” mode.
5. Press 
x
 button, 
[AMP MENU]
 button, and 
[DISC SKIP/ EX-
CHANGE]
 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
EX-CHANGE close
Disc skip
Change the next disc.
19
HCD-GN70V
 Display when an error occurred (CD Error Code Mode)
Procedure:
1. Press 
x
  button, 
[AMP MENU]
  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
  button or 
m
  button is pressed, display
change as below
Display of total error
Button
 m
Button
Display of Mechanical errors
Button
 m
 Button
Display of no disc errors
4. To clear the error record, operate the cold reset. (Refer to the
“MC COLD RESET”)
5. To release this mode, press the 
?/1
 button or disconnect the
power plug to turn the power OFF.
1) Display of total error
EMC**: The number of mechanical errors.
EDC**: 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)
(Press 
>
 button or 
.
 button to display next error)
$$: Not used
%%: Loading related error (Second figure is not used)
D: Stop by the problem other than mechanical problem while
closing.
E: Stop by the problem other than mechanical problem while
opening.
C: Stop by the problem other than mechanical problem while
chucking up.
F: Stop by the problem other than mechanical problem while
chucking down.
&&: Emerging error
01: Stop while chucking up.
02: Stop while chucking up.
03: Time-out of EX-CHANGE open.
05: Time-out of EX-CHANGE close.
##: Not used
3) Display of no disc errors
D*: The number of mechanical error (“00” is latest one)
(Press 
>
 button or 
.
 button to display next error)
$$: 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, 
[REPEAT]
  button and [CD]  button
simultaneously to enter the CD repeat 5 limit off mode .
3. To release this mode, operate the cold reset. (Refer to the “MC
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, 
[AMP MENU]
  button and 
[GAME]
  button
simultaneously. The set will power off automatically.
4. After the “STANDBY” blinking display finish, a message
“LOCK” is displayed on the fluorescent indicator tube and the
CD ship mode is set.
Display
Emc**Edc**
Display
M*$$%%&&##00
Display
D*$$%%&&##00
20
HCD-GN70V
[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, a message
“LOCK” is displayed on the fluorescent indicator tube and the
CD ship mode is set.
[CD POWER MANAGE]
• This mode let you switch on or off 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” will
be displayed on the fluorescent indicator tube.
[CD TRAY LOCK MODE]
• This mode let you lock the disc trays. When this mode is acti-
vated, the disc tray will not open when 
Z
OPEN/CLOSE
 but-
ton or 
[DISC SKIP/EX-CHANGE]
 button is pressed. The mes-
sage “LOCKED” will be displayed in the will be displayed 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” displayed
on the fluorescent indicator tube (around 5 seconds).
 [MD/VIDEO SWITCHING]
• This mode let you switch from MD to VIDEO and vice-versa.
Procedure:
1. Press 
?/1
 button to turn the set ON.
2. Select MD function.
3. Press 
[MD $VIDEO%]
 button and 
?/1
 button simultaneously.
The function will change to VIDEO. Press the same buttons
again to change from VIDEO to MD.
[Changeover the color system]
  The color system can be changed over PAL, NTSC or AUTO.
Procedure:
  The color system can be changed over PAL, NTSC or AUTO by
pressing  \/1 button while pressing followings and indication on
display changes to “COLOR PAL”, “COLOR NTSC” or “COLOR
AUTO”.
PAL
:  MUSIC EQ  +   \/1
NTSC
:  GAME EQ  +   \/1
AUTO
:  MOVIE EQ  +   \/1
Page of 79
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