HCD-RG30, MHC-DX20, MHC-RG30 — Sony Audio Service Manual (repair manual). Page 11

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11
HCD-DX20/RG30
3-8. MAIN BOARD, POWER AMP BOARD
3-9. BASE UNIT, BD BOARD
4
Three screws (+BVTT 3
 
×
 6)
6
Two screws (+BVTT 3
 
×
 6)
7
Heat sink
3
Two screws (+BVTP 3
 
×
 16)
1
Two screws (+BVTT 3
 
×
 6)
2
Main board
5
Power amp board
Main board
Base unit
qa
9
Two screws (+PTPWH M2.6)
1
Screw (+PTPWH M2.6)
q;
Screw (DIA. 12)
7
Two screws (+BVTP 2.6
 
×
 8)
6
BD board
qs
Two insulators
2
Holder (BU) assy
qs
Two insulators
8
Two stoppers (BU)
3
Wire (flat type) 19p (CN101)
4
Wire (flat type) 16p (CN102)
5
Screw (+BVTP 2.6
 
×
 8)
12
HCD-DX20/RG30
3-10. DRIVER BOARD, MOTOR BOARD AND ADDRESS SENSOR BOARD
9
 Pull-out the disc tray.
4
Two
 screws (+BVTP 2.6 
×
 8)
q;
Screw (+PTPWH 2.6
 
×
 8)
qa
Tray
1
Screw (+BVTP 2.6
 
×
 8)
qs
Screw (+BVTP 2.6
 
×
 8)
6
Wire (flat type) 8p (CN721)
3
Wire (flat type)
      8p (CN702)
8
Motor board
qd
Address sensor board
2
Driver board
5
Remove the two solderings of motor.
7
Connector 4p (CN722)
13
HCD-DX20/RG30
SECTION 4
TEST MODE
[MC 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 displays “COLD RESET” and
the set is reset.
[CD Ship Mode]
• 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  until
“STANDBY” appears.
3. When you releaset he buttons, a message “LOCK” is displayed
on the fluorescent indicator tube, and the CD ship mode is set.
[MC 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.
[CD Service Mode]
• This mode can run the CD sled motor freely. Use this mode, for
instance, when cleaning the pickup.
Procedure:
1. Press ?/1 button to turn the set ON.
2. Select the function “CD”.
3. Press three buttons x ,  ENTER , and  OPEN/CLOSE  simul-
taneously.
4. The CD service mode is selected.
5. With the CD in stop status, continue to press  >  to move the
pickup to outside track, continue to press  .   to inside track.
6. To exit from this mode, perform as follows:
1) Move the pickup to the most inside track.
2) Press three buttons in the same manner as step 2.
Note: • Always move the pickup to most inside track when exiting from
this mode.  Otherwise, a disc will not be unloaded.
• Do not run the sled motor excessively, otherwise the gear can be
chipped.
[Change-over of AM Tuner Step between 9 kHz and
10 kHz]
• 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.
[GC Test  Mode]
• This mode is used to check the software version, FL tube, LED,
keyboard, headphone and volume.
Procedure:
1. Press three buttons x ,  ENTER  and  DISC 2  simultaneously.
2. LEDs and fluorescent indicator tube are all turned on.
3. When  ENTER  and  DISC2  are pressed at the same time, the
key number check mode starts up. In this mode, the key numbers
of each key series are displayed.
4. In the key check mode, the fluorescent indicator tube displays
“KEY 
000”.  Each time a button is pressed.
5. When  ENTER  and  DISC2  are pressed at the same time, the
key count check mode starts up. In this mode, the message “KEY
CNT @@” is displayed on the FL display tube. When each
button is pressed, the key row number is incremented first. Then
the key value is then incremented. However, one the button is
pressed, the key value cannot be counted.
6. When  ENTER  and  DISC2  are pressed at the same time, the
headphones check mode starts up. In this mode, the message
“H_P ON” is displayed when the headphones are inserted. When
the headphones are not inserted. the message “H_P OFF” is
displayed.
7. When  ENTER  and  DISC2  are pressed at the same time, the
volume check mode starts up. In this mode, the message
“VOLUME FLAT” is displayed on the FL display tube. When
the volume control knob is rotated in the positive (+) direction,
the message “VOLUME UP” is displayed. When the volume
control knob is rotated in the negative (-) direction, the message
“VOLUME DOWN” is displayed.
8. In order to quit the mode, either press  ENTER  and  DISC2  at
the same time or press the three buttons at the same time as in
step 1.
9. To exit from this mode, press three buttons in the same manner
as step 1, or disconnect the power cord.
14
HCD-DX20/RG30
[MC Test  Mode]
• This mode is used to check operations of the respective sections
of Amplifier, TUNER, CD and Tape.
Procedure:
1.
Press the  ?/1  button to turn on the set.
2.
Press the three buttons of x , ENTER and DISC 3
simultaneously.
3.
A message “TEST MODE” appears on the FL display tube.
• The messages VACS1 to VACS5 are displayed when the VACS
is changed in this mode.
• The number of repeats of TAPE and CD is set to the infinite
number as the default setting.
4
 When  v (CURSOR UP)  button is pressed, GEQ increases to
its maximum and a message “GEQ MAX” appears.
5.
When  V (CURSOR DOWN)  button is pressed, GEQ decreases
to its minimum and a message “GEQ MIN” appears.
6.
When  b (CURSOR LEFT)  or  B (CURSOR RIGHT)  button
is pressed, GEQ is set to flat and a message “GEQ FLAT”
appears.
7.
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.)
8.
When a tape is inserted in the Deck B and the TAPE B function
is selected, and when the  REC PAUSE/START  button is
pressed twice, recording starts.
The VIDEO function is selected automatically as the input
source.
9.
Select the desired loop by pressing the PLAY MODE button
in the TAPE B function. Insert a test tape AMS-110A or AMS-
RO to Deck A.
10. Press the  SPECTRUM  button to enter the AMS test mode.
11. After a tape is rewound first, the FF AMS is checked, and the
mechanism is shut off after detecting the AMS signal twice.
12. Then the REW AMS is checked and the mechanism is shut off
after detecting the AMS signal twice.
13. When the check is complete, a message of either OK or NG
appears.
14. When the two buttons of  SPECTRUM  and  DISC1  are pressed
at the same time in any function modes, either the “VACS ON”
display to enable the VACS function or the “VACS OFF” display
to disable the VACS function can be selected.
15. When you want to exit this mode, press the  ?/1  button twice.
The cold reset is enforced at the same time.
[Microprocessor version display]
• If the following operation is performed during the POWER OFF
in the modes other than the POWER SAVE mode (i.e., while the
Demo display shows the watch time),
1. When three buttons of  STOP ,  ENTER , V (CUSOR DOWN)
are pressed at the same time, the MC and the GC microprocessor
version numbers are displayed as “M1.00 G1.00”.
2. When three buttons of  STOP ,  ENTER , v (CUSOR UP) are
pressed at the same time, the model name and destination are
displayed as “BG1 AS1A3”.
15
HCD-DX20/RG30
[Aging Mode]
This mode can be used for operation check of CD section and tape deck section.
• If an error occurred:
The aging operation stops and display status.
• If no error occurs:
The aging operation continues repeatedly.
1.
Operating method of Aging Mode
Turn on the main power and select “CD” of the function.
1) Set a disc in DISC1 tray.  Select ALL DISC CONTINUE, and REPEAT OFF.
2) Load the tapes recording use into the decks A and B respectively.
3) Press three buttons x ,  ENTER ,  and
DISC SKIP EX-CHANGE  simultaneously.
4) Aging operations of CD and tape are started at the same time.
5) To exit the aging mode, perform [MC Cold Reset].
3. Aging Mode in CD section
1) Display state
• No error occurs
Note:
[*][*][*][*] :  Number of aging operations
Error display
E
** s ## $$ %%
1 2 3 4 5
• When the buttons  x ,  ENTER  and  DISC 1  are pressed simultaneously, number of time of the mechanism error and the NO DISC error
can be checked.
Display:
EMC**EDC**
**:
Number of times of error (Maximum three times)
EMC: Mechanism error
EDC: NO DISC error
• When aging operation is complete, be sure to perform the MC Cold Reset to reset the error history.
D: No disc error
01: FOCUS ERROR
02: GFS ERROR
03: SETUP ERROR
01: NO DISC judgment without chucking retry
02: NO DISC judgment after chucking retry
Status at the time of NO DISC judgment
(High order digits only)
1:
STOP
2:
SETUP
3:
TOC READ
4:
ACCESS
5:
PLAY BACK
6:
PAUSE
7:
MANUAL SEARCH (PLAY)
8:
MANUAL SEARCH (PAUSE)
AGING[*][*][*][*]
1
 
**
2
 s
3
 
##
4
 
$$
5
 
%%
M: Mechanism error
Don’t care
High order digits only
D: Stopped during closing due to problems other than mechanism.
E: Stopped during opening due to problems other than mechanism.
C: Stopped during chucking due to problems other than mechanism.
F: Stopped during EX-opening due to problems other than mechanism.
Emergency related errors (High order digits only)
1:
Stopped during chuck-up
2:
Stopped during chuck-down
3:
Time out by EX-OPEN
5:
Time out by EX-CLOSE
The error No. 00 indicates the newest error.  As the error No. increases, it means the older error.
When you want to retrieve the error history, press the  PLAY MODE  button in the case of mechanism error.
Or press the  REPEAT  button in the case of NO DISC error.
Display

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