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Model
HCD-GRX50 HCD-R770 HCD-RXD7 MHC-GRX50 MHC-R770 MHC-RXD7
Pages
71
Size
6.19 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
hcd-grx50-hcd-r770-hcd-rxd7-mhc-grx50-mhc-r770-mhc.pdf
Date

Sony HCD-GRX50 / HCD-R770 / HCD-RXD7 / MHC-GRX50 / MHC-R770 / MHC-RXD7 Service Manual ▷ View online

– 9 –
FRONT  PANEL  SECTION
CD  MECHANISM  DECK  SECTION (CDM38LH-5BD32L)
4
screw
(BVTT2.6 
×
 5)
4
screw
(BVTT2.6 
×
 5)
6
screw
(BVTT3 
×
 10)
9
front panel section
6
screw
(BVTP3 
×
 10)
7
three screws
(BVTT3 
×
 6)
5
lug
5
lug
3
wire (flat type) 
(15 core) (CN303)
1
wire (flat type) (17 core)
(CN304)
2
wire (flat type) 
(23 core) (CN501)
1
screw
(BVTP3 
×
 10)
2
two screws
(BVTP3 
×
 8)
4
two connectors
(CN392, 393)
5
wire (flat type) (19 core)
(CN391)
1
screw
(BVTP3 
×
 10)
3
Remove the CD mechanism 
deck (CDM38LH-5BD32L)
in the direction of arrows
A
 – 
B
.
B
A
– 10 –
TAPE  MECHANISM  DECK  SECTION (TCM-230AWR2)
MAIN  BOARD
1
Push the cassette lid.
4
tape mechanism deck section
(TCM-230AWR2)
1
Push the cassette lid.
2
Open two 
cassette lids.
3
two screws
(BVTP2.6 
×
 8)
3
three screws
(BVTP2.6 
×
 8)
6
five screws
(BVTP3 
×
 8)
5
two screws
(BVTP3 
×
 8)
8
connector
(CN403)
(EXCEPT Canadian)
4
two screws
(BVTP3 
×
 8)
3
connector
(CN953) (GRX50)
2
connector
(CN952) 
7
Remove the MAIN board
in the direction of the arrow.
1
wire (flat type)
13 core: EXCEPT AEP, UK, Singapore, Taiwan
15 core: AEP, UK, Singapore, Taiwan
(CN371)
(
)
– 11 –
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. Turn the power ON or set to the DEMO mode.
2. Press three buttons of
p , 
[ENTER/NEXT]
, and
1/
u
 simulta-
neously.
3. The set is reset, and displays “COLD RESET”, then becomes
DEMO mode.
[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. Turn the power ON or set to the DEMO mode.
2. Press three buttons of
p , 
[ENTER/NEXT]
, and 
[DISC 1]
 si-
multaneously.
3. The set is reset, and becomes standby state.
[Change-over the AM Tuning Interval]
(EXCEPT AEP, UK, and Saudi Arabia models)
• The AM tuning interval can be changed over 9 kHz or 10 kHz.
Procedure:
1. Press the
1/
u
button to turn the power ON.
2. Select the function “TUNER”, and press the 
[TUNER/BAND]
button to select the BAND “AM”.
3. Press the
1/
u
button to turn the power OFF.
4. Press the 
[ENTER/NEXT]
 and
1/
u
buttons simultaneously,
and the display on the fluorescent indicator tube changes to
“AM 9 k STEP” or “AM 10 k STEP”, and thus the tuning
interval is changed over.
[CD Delivery Mode]
• 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.
Procedure:
1. Press the
1/
u
button to turn the power ON.
2. Press the 
[LOOP]
 and
1/
u
buttons simultaneously.
3. A message “LOCK” is displayed on the fluorescent indicator
tube, and the CD delivery mode is set.
[LED and Fluorescent Indicator Tube All Lit, Key Check
Mode]
Procedure:
1. Press three buttons of
p , 
[ENTER/NEXT]
, and 
[DISC 2]
 si-
multaneously.
2. LEDs and fluorescent indicator tube are all turned on.
Press the 
[DISC 2]
 button, and the key check mode is acti-
vated.
3. In the key check mode, the fluorescent indicator tube displays
“K 0 J0 V0”. Each time a button is pressed, “K” value in-
creases. However, once a button is pressed, it is no longer taken
into account.
“J” value increases like 1, 2, 3 ... if turn the JOG dial clock-
wise, or it decreases like 0, 9, 8 ... if turn the JOG dial counter-
clockwise.
“V” value increases like 1, 2, 3 ... if turn the 
[VOLUME]
 dial
clockwise, or it decreases like 0, 9, 8 ... if turn the JOG dial
counterclockwise.
4. To exit from this mode, press three buttons in the same man-
ner as step 1, or disconnect the power cord.
[CD Service Mode]
• This mode can run the CD sled motor optionally. Use this mode,
for instance, when cleaning the optical pick-up.
Procedure:
1. Press the
1/
u
button to turn the power ON.
2. Select the function “CD”.
3. Press three buttons of
p , 
[ENTER/NEXT]
, and
§  simulta-
neously.
4. Set to the Sled Servo mode.
5. With the CD in stop status, turn the JOG dial clockwise to
move the optical pick-up to outside track, or turn it counter-
clockwise to inside track.
6. To exit from this mode, perform as follows.
1) Move the optical pick-up to the most inside track.
2) Disconnect the power cord.
Notes:
• Always move the optical pick-up 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.
– 12 –
[Aging Mode]
This mode can be used for operation check of CD section and tape
deck section.
CD section and tape deck section work in parallel.
• If an error occurred:
The aging operation stops only an error occurred sections and
display then status.
• If no error occurs:
The aging operation continues repeatedly.
Procedure:
1. Set disc in DISC1 tray.
2. Load the tapes into the decks A and B respectively.
3. Press the 
[PLAY MODE]
 button to set the “ALL DISCS” mode,
and press the 
[REPEAT]
 button to “REPEAT” off.
4. Press the 
[FUNCTION]
 button to select the function “CD”.
5. Press three buttons of
p  , 
[ENTER/NEXT]
, and 
[DISC SKIP/
EX-CHANGE]
 simultaneously.
6. The aging mode is activated, if the indicator of disc tray num-
ber on the fluorescent indicator tube is blinking.
7. 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”)
1. Display at the Aging Mode
• Display operating state of CD section and tape deck section al-
ternately.
• If an error occurred, stop display which that section.
2. CD Section
• Display at the aging mode is the same as the normal operation.
• The sequence during the aging mode is following as below.
Aging mode sequence (CD section) :
Turn the disc tray
Disc1 chucking
TOC read
Play track1 for 2 seconds
Play last track for 2 seconds
• Display at an error occurred
1) Display of the error count
(1)
Press three buttons of
p , 
[ENTER/NEXT]
, and 
[CD SYNC]
simultaneously.
(2)
Display of the error count following as below.
Display
EMC
**
EDC
**
Notes:
EMC
**
: The number of mechanical error.
EDC
**
: The number of no disc error after chucking the disc.
2) Display of mechanical error
Display
E
**
M##$$&&
Notes:
**
: The number of mechanical error.(“00” is latest one)
(Press the 
[PLAY MODE]
 button to changes next error display)
## : Not used.
$$ : Loading error. (Second figure is not used)
D : The error in the midst of close at the except mechanical trouble.
E : The error in the midst of open at the except mechanical trouble.
C : The error in the midst of chuck up at the except mechanical
trouble.
F : The error in the midst of EX-open at the except mechanical
trouble.
&&: Loading error. (Second figure in not used)
1:The error in the midst of chuck up.
2:The error in the midst of chuck down.
3:Time up of EX-open
4:Time up of EX-close.
3) Display of no disc error
Display
E
**
D##$$&&
Notes:
**
: The number of mechanical error.(“00” is latest one)
(Press the 
[REPEAT]
 button to changes next error display)
##:
01: Focus error
02: GFS error
03: Set up error
$$:
00: No disc error when does not chucking retry.
02: No disc error when chucking retry to completion.
&&: The state when judged no disc error. (Second figure is not used)
1: Stop
2: Set up
3: TOC read
4: Access
5: Play
6: Pause
7: Manual search (Play)
8: Manual search (Pause)
Page of 71
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