Sony HCD-VX55J / MHC-VX55 / MHC-VX55J Service Manual ▷ View online
13
[MC Test Mode]
• This mode is used to check operations of the respective sections
of Amplifier, Tuner, CD and Tape.
• This mode is used to check operations of the respective sections
of Amplifier, Tuner, CD and Tape.
Procedure:
1.
1.
Press the three buttons of x , ENTER and DISC 3
simultaneously.
simultaneously.
2.
A message “TEST MODE” appears on the FL display tube.
3.
When f (CURSOR UP) button is pressed, GEQ increases to
its maximum and a message “GEQ AMX” appears.
its maximum and a message “GEQ AMX” appears.
4.
When F (CURSOR DOWN) button is pressed, GEQ decreases
to its minimum and a message “GEQ MIN” appears.
to its minimum and a message “GEQ MIN” appears.
5.
When g (CURSOR LEFT) or G (CURSOR RIGHT) button
is pressed, GEQ is set to flat and a message “GEQ FLAT”
appears.
is pressed, GEQ is set to flat and a message “GEQ FLAT”
appears.
6.
When the VOLUME control 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.
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.
7.
When the VOLUME control 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.
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.
8.
In the test mode, the default-preset channel is called even when
the TUNER is selected and an attempt is made to call the preset
channel that has been stored in memory, by operating the Shuttle
knob. (It means that the memory is cleared.)
the TUNER is selected and an attempt is made to call the preset
channel that has been stored in memory, by operating the Shuttle
knob. (It means that the memory is cleared.)
9.
When CD is selected and the EDIT button is pressed, the disc
that is being chucked at this moment becomes the default
setting. It means that the default disc only is accessed when
any other discs are selected even though the display indication
changes accordingly. At the same time, the DISK SKIP EX-
CHANGE and OPEN/CLOSE cannot be accepted. (It means
that the tray motor and the turntable motor are disabled of their
operation.)
that is being chucked at this moment becomes the default
setting. It means that the default disc only is accessed when
any other discs are selected even though the display indication
changes accordingly. At the same time, the DISK SKIP EX-
CHANGE and OPEN/CLOSE cannot be accepted. (It means
that the tray motor and the turntable motor are disabled of their
operation.)
10. When a tape is inserted in Deck B and recording is started, the
input source function selects VIDEO automatically.
11. When x button is pressed to stop recording, the Tape (Deck)
B is selected and tape is rewound using the Shuttle knob, tape
is rewound, tape is stops at around the record-starting position
and playback of the recorded portion of the tape is started. If
PAUSE is inserted even once during recording, tape is rewound
to the position around the PAUSE position and is played back.
is rewound, tape is stops at around the record-starting position
and playback of the recorded portion of the tape is started. If
PAUSE is inserted even once during recording, tape is rewound
to the position around the PAUSE position and is played back.
12. When the CD SYNC HI-DUB Button is press during playback
of Deck B, either normal speed or high speed can be selected
by this button.
by this button.
13. Select the desired loop by pressing the PLAY MODE button.
Insert a test tape AMS-110A or AMS-RO to Deck A.
14. Press the SPECTRUM button to enter the AMS test mode.
15. After a tape is rewound first, the FF AMS is checked, and the
15. After a tape is rewound first, the FF AMS is checked, and the
mechanism is shut off after detecting the AMS signal twice.
16. Then the REW AMS is checked and the mechanism is shut off
after detecting the AMS signal twice.
17. When the check is complete, a message of either OK or NG
appears.
18. When you want to exit this mode, press the ?/1 button twice.
The cold reset is enforced at the same time.
14
[Tape Aging Mode]
This mode can be used for operation check of tape deck section.
Tape deck section work in parallel.
• If an error occurred:
This mode can be used for operation check of tape deck section.
Tape deck section work in parallel.
• If an error occurred:
The aging operation stops and displays then status.
• If no error occurs:
The aging operation continues repeatedly.
Procedure:
1. Load the tapes into the decks A and B respectively.
2. Press the CD button to select the function “CD”.
3. Press the PLAY MODE button to set the ALL DISCS mode,
1. Load the tapes into the decks A and B respectively.
2. Press the CD button to select the function “CD”.
3. Press the PLAY MODE button to set the ALL DISCS mode,
and press the REPEAT button to “REPEAT” off.
4. Press three buttons of
p , ENTER , and DISC SKIP/EX-
CHANGE simultaneously.
5. The aging mode is activated.
6. To exit from the aging mode, press the
6. To exit from the aging mode, press the
1/
u
button to turn the
power OFF and operate the cold reset. (Refer to the “MC Cold
Reset”)
Reset”)
1. Display at the Aging Mode
• Display operating state of tape deck section alternately.
• If an error occurred, stop display.
• Display operating state of tape deck section alternately.
• If an error occurred, stop display.
2. Tape Deck Section
• The sequence during the aging mode is following as below.
• If an error occurred, stop display that step.
• The sequence during the aging mode is following as below.
• If an error occurred, stop display that step.
Aging mode sequence (Tape deck section) :
Rewind the tape A and B
“TAPE A AG-1”
Shut off
FWD play the tape A
“TAPE A AG-2”
2 minutes
Fast forward the tape A
“TAPE A AG-3”
Shut off or 20 seconds
REV play the tape A
“TAPE A AG-4”
2 minutes
Rewind the tape A
“TAPE A AG-5”
Shut off
FWD play the tape B
“TAPE B AG-2”
2 minutes
Fast forward the tape B
“TAPE B AG-3”
Shut off or 20 seconds
REV play the tape B
“TAPE B AG-4”
2 minutes
Rewind the tape B
“TAPE B AG-5”
Shut off
Note: “TAPE
*
AG-
*
” is display of each step.
15
[CD Aging Mode]
Procedure:
1.
Procedure:
1.
Short SL501 by soldering.
2.
Turn on the main power. Set a disc on the DISC1 tray. Select
CD.
CD.
3.
Press the SELECT/gG button. The aging mode starts.
4.
Aging status appears on the monitor screen.
How to exit the CD aging mode:
1.
1.
Press the ?/1 and turn off the main power.
2.
Remove soldering from SL501.
[Function Change Mode]
* elect either VIDEO or MD of the external FUNCTION input.
* elect either VIDEO or MD of the external FUNCTION input.
Procedure:
1.
1.
Turn on the power.
2.
Press the two buttons ENTER and ?/1 at the same time.
The main power is turned on and the other function of the
previous function is selected and displayed. “MD” or
“VIDEO”.
The main power is turned on and the other function of the
previous function is selected and displayed. “MD” or
“VIDEO”.
[VIDEO CD Color-bars Mode]
On this mode, the data of the color-bars signal as a picture signal
and the 1 kHz sine wave signal as a sound signal are output by the
mechanism controller (IC502) for the video CD signal check. When
measurement of the voltage and waveform on the VIDEO board,
perform it in this mode.
For reference, the color-bars signal can be observed at J302 (VIDEO
OUT) using an oscilloscope.
Procedure:
1. Short the both ends of the land of SL503 of the VIDEO board.
2. Turn the power on. Press the CD button to select CD.
3. The color-bars appears when the CD is in stop status, and it
On this mode, the data of the color-bars signal as a picture signal
and the 1 kHz sine wave signal as a sound signal are output by the
mechanism controller (IC502) for the video CD signal check. When
measurement of the voltage and waveform on the VIDEO board,
perform it in this mode.
For reference, the color-bars signal can be observed at J302 (VIDEO
OUT) using an oscilloscope.
Procedure:
1. Short the both ends of the land of SL503 of the VIDEO board.
2. Turn the power on. Press the CD button to select CD.
3. The color-bars appears when the CD is in stop status, and it
disappears when the CD goes in play status.
4. After measuring, remove the lead wire connected.VIDEO board
(SIDE B)
TOC reading
Last track is played back
First track is played back
OPEN
CLOSE
Monitor Display
1st line
OPEN/CLOSE/CD PLAY display
2nd line
DISC1/DISC1-15/DISC1-1/TIME display
4th line
COUNT : 1 display
5th line
TOTAL ERR : 00 display
6th line
JITTER FF display
3rd line
AGING
[CD Servo ON/OFF Mode]
Procedure:
1.
Procedure:
1.
Short SL502 on the VIDEO board by soldering.
2.
Turn on the main power. Set a disc on the DISC1 tray. Select
CD.
CD.
3.
Press the hH button to play back CD.
4.
When the > + button is pressed, 100 track jump is executed.
5.
Also, every pressing of the PLAY MODE button triggers
between ON and OFF of TRACKING SERVO and SLED
SERVO.
between ON and OFF of TRACKING SERVO and SLED
SERVO.
How to quit the CD servo ON/OFF mode:
1.
1.
Press the ?/1 button to turn off the main power.
2.
Remove soldering from SL502.
VIDEO board (SIDE A)
J301
J302
CN501
CN503
SL503
SL502
SL501
CHECK LED
CN502
16
SECTION 5
MECHANICAL ADJUSTMENTS
SECTION 6
ELECTRICAL ADJUSTMENTS
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 Adjustment
Tape
Signal
Used for
P-4-A100
10 kHz, –10 dB
Azimuth Adjustment
WS-48B
3 kHz, 0 dB
Tape Speed Adjustment
P-4-L300
315 Hz, 0 dB
Level Adjustment
DECK A DECK B
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback
1. Mode: Playback
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
pinch rollers
erase head
rubber belts
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
set
MAIN board
CN301
Pin 3 (L-CH)
Pin 1 (R-CH)
CN301
Pin 3 (L-CH)
Pin 1 (R-CH)
MAIN board
CN301
Pin 2 (GND)
CN301
Pin 2 (GND)
+
–
–
level meter
test tape
P-4-A100
(10 kHz, –10 dB)
P-4-A100
(10 kHz, –10 dB)
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
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