Sony HCD-GN700 / HCD-GX8800 / MHC-GN700 / MHC-GX8800 Service Manual ▷ View online
17
HCD-GN700/GX8800
[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.
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.
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.
STEP” or AM 10k STEP” appears 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. Presd
?/1
button to turn the set ON.
2. Select CD function.
3. Press
x
,
[AMP MENU]
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, 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.
appears.
6. 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
• 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
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
Open the disc tray
Disc skip
Close the disk tray
Change the next disc.
18
HCD-GN700/GX8800
•
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
M
+
Button
–
m
Button
Display of Mechanical errors
M
+
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.
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)
$$: Not used
%%: Loading related error (Second figure is not used)
%%: Loading related error (Second figure is not used)
D: Stop by the problem other than mechanical problem while
closing.
E: Stop by the problem other than mechanical problem while
opening.
C: Stop by the problem other than mechanical problem while
chucking up.
F: Stop by the problem other than mechanical problem while
chucking down.
&&: Emerging error
01: Stop while chucking up.
02: Stop while chucking up.
03: Time-out of EX-CHANGE open.
05: Time-out of EX-CHANGE close.
02: Stop while chucking up.
03: Time-out of EX-CHANGE open.
05: Time-out of EX-CHANGE close.
##: Not used
3) Display of no disc errors
D*: The number of mechanical error (“00” is latest one)
(Press
>
button or
.
button to display next error)
$$: Error type
01: Focus error
02: GFS error
03: Setup error
02: GFS error
03: Setup error
%%: Not used
&&:
&&:
00: No disc judgment without chucking retry.
01: No disc judgment after 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)
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.
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 and the
fluorescent indicator tube displays “LIMIT OFF”.
fluorescent indicator tube displays “LIMIT OFF”.
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.
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.
CD ship mode is set.
Display
EMC**EDC**
Display
M*$$%%&&##00
Display
D*$$%%&&##00
19
HCD-GN700/GX8800
[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.
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 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.
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.
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
activated, the disc tray will not open when
Z
OPEN/CLOSE
button or
[DISC SKIP/EX-CHANGE]
button is pressed. The
message “LOCKED” will be displayed in the will be displayed
on the fluorescent indicator tube.
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).
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.
again to change from VIDEO to MD.
20
HCD-GN700/GX8800
SECTION 5
MECHANICAL ADJUSTMENTS
SECTION 6
ELECTRICAL ADJUSTMENTS
Precaution
1. Clean the following parts with a denatured alcohol-moistened
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads
record/playback heads
pinch rollers
erase head rubber belts
capstan
capstan
idlers
2. Demagnetize the record/playback head with a head
demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Torque Measurement
3.06 N • m to 6.96 N • m
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
0.19 N • m to 0.58 N • m
2 to 6 g • cm
(0.02 – 0.08 oz • inch)
3.06 N • m to 6.96 N • m
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
0.19 N • m to 0.58 N • m
2 to 6 g • cm
(0.02 – 0.08 oz • inch)
6.96 N • m to 14.02 N • m
71 to 143 g • cm
(0.98 – 1.99 oz • inch)
9.80 N • m
100 g or more
(3.53 oz or more)
9.80 N • m
100 g or more
(3.53 oz or more)
Mode
Torque meter
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
Meter reading
FWD
FWD
back tension
REV
REV
back tension
FF/REW
FWD tension
REV tension
0 dB=0.775 V
DECK SECTION
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
3. After the adjustments, apply suitable locking compound to the
parts adjust.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in this
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit
adjustment.)
should be completed before performing recording circuit
adjustment.)
6. The adjustments should be performed for both L-CH and R-
CH.
7. Switches and controls should be set as follows unless otherwise
specified.
• Test Tape
RECORD/PLAYBACK HEAD AZIMUTH ADJUST-
MENT
MENT
DECK A DECK B
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback
1. Mode: Playback
Tape
Signal
Used for
P-4-A100
10 kHz, –10 dB
Azimuth Adjustment
set
MAIN board
CN301
Pin
CN301
Pin
1
(L-CH)
Pin
3
(R-CH)
MAIN board
CN301
Pin
CN301
Pin
2
(GND)
+
–
–
level meter
test tape
P-4-A100
(10 kHz, –10 dB)
P-4-A100
(10 kHz, –10 dB)
Click on the first or last page to see other HCD-GN700 / HCD-GX8800 / MHC-GN700 / MHC-GX8800 service manuals if exist.