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Model
HCD-VX555 HCD-VX555J MHC-VX555 MHC-VX555J
Pages
85
Size
17.88 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
hcd-vx555-hcd-vx555j-mhc-vx555-mhc-vx555j.pdf
Date

Sony HCD-VX555 / HCD-VX555J / MHC-VX555 / MHC-VX555J Service Manual ▷ View online

12
HCD-VX555/VX555J
SECTION 3
TEST MODE
[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 three buttons x  ,  ENTER , and ?/1 simultaneously.
2. The fluorescent indicator tube becomes blank instantaneously,
and the set is reset.
[Hot Reset]
• This mode resets the set with the preset data kept stored in the
memory.  The hot reset mode functions same as if the power
cord is plugged in and out.
Procedure:
1. Press three buttons x ,  ENTER , and DISPLAY
simultaneously.
2. The fluorescent indicator tube becomes blank instantaneously,
and the set is reset.
[Tuner Step Change]
• A step of AM channels can be changed over between 9 kHz and
10 kHz.
Procedure:
1. Press ?/1 button to turn the set ON.
2. Select the function “TUNER”, and press  TUNER/BAND  button
to select the BAND “AM”.
3. Press ?/1 button to turn the set OFF.
4. Press  ENTER  and ?/1 buttons simultaneously, and the display
of  fluorescent indicator tube changes to “AM 9 k STEP” or
“AM 10 k STEP”, and thus the channel step is changed over.
[Function Change Mode]
• Select either VIDEO or MD of the external FUNCTION input.
Procedure:
1. Turn on the power.
2. Hold down  MD (VIDEO)  button then press  ?/1  button , and
release  ?/1  button first in order not to switch off the set
immediately.
The another function of the previous function is selected , the
input level is also changed and displayed “ MD ” or “VIDEO”.
[GC Test  Mode]
• This mode is used to check the software version, FL tube, LED,
keyboard and VACS.
Procedure:
1. Press three buttons x ,  ENTER  , and  DISC 2  simultaneously.
2. LEDs and fluorescent indicator tube are all turned on.
3. When you want to enter the software version display mode,
press  DISC 1 .  The model number and destination are displayed.
4. Each time  DISC 1  is pressed, the display changes starting
from MC version, GC version, CD version, CDDM version,
CDMA version, CDMB, version BDA version, BDB version,
ST version,  TA version, TM version and TC version in this
order, and returns to the model number and destination display.
5. When  DISC 3  is pressed while the version numbers are being
displayed except model number and destination, year, month
and day of the software creation appear.  When  DISC 3  is
pressed again, the display returns to the software version display.
When  DISC 1  is pressed while year, month and day of the
software creation are being displayed, the year, month and day
of creation of the software versions are displayed in the same
order of version display.
6. Press  DISC 2  button, and the key check mode is activated.
7. In the key check mode, the fluorescent indicator tube displays
“K
0  V0”.  Each time a button is pressed, “KEY” value increases.
However, once a button is pressed, it is no longer taken into
account.
“VOL” value increases like 1, 2, 3 ... if rotating  VOLUME
knob in “+”  direction, or it decreases like 0, 9, 8 ... if rotating in
“–” direction.
8. Also when  DISC 3  is pressed after lighting of all LEDs and FL
tubes, value of VACS appears.
9. To exit from 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 the  ?/1  button to turn on the set.
2. Press the three buttons of x , ENTER and DISC 3
simultaneously.
3. The messages MUSIC, MOVIE, GAME and P FILE flash on
the FL display tube.
The input FUNCTION is Changed to VIDEO.
* Check of Amplifier
1.  When f (CURSOR UP)  button is pressed, GEQ increases to
its maximum and a message “GEQ MAX” appears.
2. When  F (CURSOR DOWN)  button is pressed, GEQ decreases
to its minimum and a message “GEQ MIN” appears.
3. When  g (CURSOR LEFT)  or  G (CURSOR RIGHT)  button
is pressed, GEQ is set to flat and a message “GEQ FLAT”
appears.
4. 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.
5. 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.
* Check of clock frequency
1. To check the frequency of clock used to run the time in the unit,
the clock output is available at pin 39 (IC 501, MASTER
CONTROL) only during MC test mode.
2. The frequency is 32.768 kHz or so.
* Tuner function
1. 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. (It means that the
memory is cleared.)
2. The minimum, center and maximum frequency of each band is
set then.
13
HCD-VX555/VX555J
* Tape function
1. When a tape is inserted in Deck B and recording is started, the
input source function selects VIDEO automatically.
When  CD SYNC/HI-DUB  button is pressed during Rec in
function, ALC is turned on.
2.   When   x  button is pressed to stop recording, the Tape (Deck)
B is selected and tape is rewound, tape is rewound using  m
button, 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.
3.
When  CD SYNC / HI-DUB  button is pressed during playback
of Deck B, either normal speed or high speed can be selected
by this button.
* AMS Test Mode
1.
Set TAPE function
2.
Select the desired loop by pressing the  PLAY MODE  button.
Insert a test tape AMS-110A or AMS-120 to Deck A.
3.
Press the  SPECTRUM  button to enter the AMS test mode.
4.
After a tape is rewound first, the FF AMS is checked, and the
mechanism is shut off after detecting the AMS signal twice.
5.
Then the REW 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 return to normal mode again.
1.
When you want to exit this mode, press the  ?/1  button.
2.     The cold reset is enforced at the same time.
[VACS ON/OFF Mode]
• This mode is used to switch ON and OFF the VACS (Variable
Attenuation Control System).
Procedure:
Press the  ENTER  and  SPECTRUM  buttons simultaneously.  The
message “VACS OFF” or “VACS ON” appears.
[CD Aging Mode]
Procedure:
1.
Short SL501 by soldering.
2.
Turn on the main power.  Set a disc on the DISC1 tray.  Select
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.
Press the  ?/1   and turn off the main power.
2.
Remove soldering from SL501.
[Function Change Mode]
Select either VIDEO or MD of the external FUNCTION input.
Procedure:
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”.
[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 CN301 pin2
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)
[CD Servo ON/OFF Mode]
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.
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.
How to quit the CD servo ON/OFF mode:
1.
Press the  ?/1  button to turn off the main power.
2.
Remove soldering from SL502.
[CD Ship Mode (Memory Clear) ]
• This mode moves the pickup to the position durable to vibra-
tion. Use this mode when returning the set to the customer after
repair.
Procedure:
1. Press
1/u button to turn the set ON.
2. Press  three  buttons  x  , ENTER and GAME  simultaneously.
3. After the "STANDBY" display blinks six times, a message
“LOCK” is displayed on the fluorescent indicator tube, and the
CD ship mode is set.
[CD Ship Mode (No Memory Clear) ]
• This mode moves the pickup to the position durable to vibra-
tion. Use this mode when returning the set to the customer after
repair.
Procedure:
1. Press
1/u button to turn the set ON.
2. Press  CD  button and  
1/u   button simultaneously.
3. After the "STANDBY" display blinks six times, a message
“LOCK” is displayed on the fluorescent indicator tube, and the
CD ship mode is set.
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
Ver 1.3  2002.07
14
HCD-VX555/VX555J
[ VIDEO BOARD ] (SIDE A)
J301
CN501
CN301
1  2  3
CN503
SL503
SL502
SL501
CHECK LED
CN502
15
HCD-VX555/VX555J
SECTION 4
MECHANICAL ADJUSTMENTS
SECTION 5
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
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.)
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-L300J
315 Hz, 0 dB
Level Adjustment
DECK A      DECK B
Note:
  Perform this adjustments for both decks
Procedure:
1. Mode:  Playback
Precaution
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
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)
MAIN board
CN301
Pin 
2
 (GND)
+
level meter
test tape
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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