DOWNLOAD Sony HCD-RG30 / MHC-DX20 / MHC-RG30 Service Manual ↓ Size: 5.81 MB | Pages: 59 in PDF or view online for FREE

Model
HCD-RG30 MHC-DX20 MHC-RG30
Pages
59
Size
5.81 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
hcd-rg30-mhc-dx20-mhc-rg30.pdf
Date

Sony HCD-RG30 / MHC-DX20 / MHC-RG30 Service Manual ▷ View online

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
16
HCD-DX20/RG30
2)  Operation during aging mode
In the aging mode, the program is executed in the following
sequence.
(1)
The disc tray opens and closes.
(2)
The mechanism accesses DISC 2 and makes an attempt to
read TOC.  However, since there are no discs, a message
“CD2 NO DISC” appears.
(3)
The mechanism accesses DISC 3 and a message “CD3 NO
DISC” appears.
(4)
The disc tray turns to select a disc1.
(5)
A disc is chucked.
(6)
TOC of disc is read.
(7)
The pickup accesses to the track 1, and  playing 2 seconds.
(8)
The pickup accesses to the last track, and playing 2 seconds.
(9)
Every time when an aging operation of step 1 to step 8 is
complete, the display “AGING[*][*][*][*]” value increases
as the number of aging operations is counted up.
(10) Returns to step 1.
3. Aging Mode in Tape Deck section
1) Display state
• No error occurs
Display action now
• Error occurred
Display action last time
2)  Operation during aging mode
In the aging mode, the program is executed in the following
sequence.
(1) Rewind is executed up to the top of tape A and B.
(2) A tape on FWD side is played for 2 minutes.
(3) FF is executed up to either made for 20 second or the end of
tape.
(4) B tape is reversed, and the tape on REV side is played for 2
minutes.
(5) Rewind is executed up to the top of tape.
(6) Returns to step 2, and repeat steps from 2 to 5.
[Function Change Mode]
* elect either VIDEO or MD of the external FUNCTION input.
Procedure:
1.
Turn on the power.
2.
Press the two buttons  MD (VIDEO)  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”.
NO. Display action
Action contents
Final timing
1
TAPE A AG-6
Rewind the TAPE A
The top of tape
TAPE B AG-1
Rewind the TAPE B
2
TAPE A AG-2
FWD play the TAPE A
2 minutes playing
3
TAPE A AG-3
F.F. the TAPE A
20 second FF or the end
of tape
4
TAPE A AG-4
REV play the TAPE A
2 minutes playing
5
TAPE A AG-5
Rewind the TAPE A
The top of tape
6
TAPE B AG-2
FWD play the TAPE B
2 minutes playing
7
TAPE B AG-3
F.F. the TAPE B
20 second FF or the end
of tape
8
TAPE B AG-4
REV play the TAPE B
2 minutes playing
9
TAPE B AG-5
Rewind the TAPE B
The top of tape
17
HCD-DX20/RG30
SECTION 5
ELECTRICAL ADJUSTMENTS
FM Tuned Level Adjustment
Procedure:
1.
Supply a 98 MHz signal at 28 dB from the ANTENNA terminal.
2.
Tune the set to 98 MHz.
3.
Adjust RV101 to the point (moment) when the TUNED
indicator will change from going off to going on.
Adjustment Location: MAIN board
Null Adjustment
Procedure:
1.
Supply a 98 MHz signal at 60 dB from the ANTENNA terminal.
2.
Tune the set to 98 MHz.
3.
Measure voltage between pin 21 and pin 23 of IC 101.  Adjust
T101 ubtil the voltage becomes 0 V.
Adjustment Location: MAIN board
Adjustment Location
[MAIN BOARD]   Component side
FM RF Signalgenerator
75 
 coaxial
Carrier frequency : 98 MHz
Modulation           : AUDIO 1 kHz, 75 kHz
                              deviation (100%)
Output level          : 28 dB  (at 75 
 open)
FM ANTENNA terminal
(TM101)
set
FM RF Signalgenerator
75 
 coaxial
Carrier frequency : 98 MHz
Modulation           : AUDIO 1 kHz, 75 kHz
                              deviation (100%)
Output level          : 60 dB  (at 75 
 open)
FM ANTENNA terminal
(TM101)
set
CD SECTION
Note :
1. CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10M
Ω impedance.
4. Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
S-Curve Check
Procedure :
1. Connect oscilloscope to TP (FEO).
2. Connect between TP (FEI) and TP (VC) by lead wire.
3. Connect between TP (AGCCON) and TP (D GND) by lead wire.
4. Turn Power switch on.
5. Load a disc (YEDS-18) and actuate the focus search. (In
consequence of open and close the disc tray, actuate the focus
search)
6. Confirm that the oscilloscope waveform (S-curve) is
symmetrical between A and B. And confirm peak to peak level
within 4 
±1 Vp-p.
7. After check, remove the lead wire connected in step 2 and 3.
Note : • Try to measure several times to make sure than the ratio
of A : B or B : A is more than 10 : 7.
• Take sweep time as long as possible and light up the
brightness to obtain best waveform.
RF Level Check
Procedure :
1. Connect oscilloscope to TP (RF).
2. Connect between TP (AGCCON) and TP (D GND) by lead wire.
3. Turned Power switch on.
4. Load a disc (YEDS-18) and playback.
5. Confirm that oscilloscope waveform is clear and check RF signal
level is correct or not.
6. After check, remove the lead wire connected in step 2.
BD board
Oscilloscope
TP(FEO)
TP(VC)
symmetry
S-curve waveform
within 4 
±1Vp-p
A
B
TP(RF)
TP(VC)
BD board
oscilloscope
T101
RV661
RV101
IFT101
T102
RV661:TAPE SPEED
T101:NULL
RV101:FM TUNED LEVEL
Page of 59
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