Sony CMT-M90DVD / HCD-M90 Service Manual ▷ View online
5
HCD-M90
SECTION 1
SERVICING NOTES
The laser diode in the optical pick-up block may suffer electro-
static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emis-
sion, observe from more than 30 cm away from the objective lens.
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emis-
sion, observe from more than 30 cm away from the objective lens.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
BLOCK OR BASE UNIT
MODEL IDENTIFICATION
– Back Panel –
– Back Panel –
SERVICE POSITION
In checking the control board, prepare jig (extension cable J-2501-
219-B: 1.00 mm Pitch, 10 cores, Length 300 mm).
219-B: 1.00 mm Pitch, 10 cores, Length 300 mm).
Part No.
In checking the tape deck section, prepare jig (extension cable J-
2501-167-A: 1.25 mm Pitch, 17 cores, Length 300 mm).
2501-167-A: 1.25 mm Pitch, 17 cores, Length 300 mm).
Model Name
Part No.
AEP and UK models
4-239-822-0
[]
US and Canadian models
4-239-823-0
[]
Singapore model
4-239-824-0
[]
Australian model
4-240-899-0
[]
Chinese model
4-242-690-0
[]
Connect jig (extension cable J-2501-219-B)
to the control board (CN507) and DVD board (CN101).
to the control board (CN507) and DVD board (CN101).
control board (CN008)
DVD board (CN008)
TC board (CN301)
main board (CN301)
Connect jig (extension cable J-2501-167-A)
to the main board (CN301) and TC board (CN301).
to the main board (CN301) and TC board (CN301).
RELEASING THE DISC TRAY LOCK
The disc tray lock function for the antitheft of an demonstration
disc in the store is equipped.
disc in the store is equipped.
Releasing Procedure :
While pressing the
While pressing the
x
key, press the
[ DVD]
key. The message
“UNLOCKED” is displayed and the tray is unlocked.
Note:
When “LOCKED” is displayed, the tray lock is not released by
turning power on/off with the
turning power on/off with the
I
/
1
button.
Ver 1.3
Z
6
HCD-M90
Ver 1.3
NEW/FORMER DISCRIMINATION
In this set, RF-240, DVD, TC, MAIN, JACK, CONTROL,
SWITCH and POWER boards have been changed in the midway
of production.
SWITCH and POWER boards have been changed in the midway
of production.
Note:
Chinese model is produced only with the new boards.
– RF-240 BOARD (Side A) –
Former : 1-681-879-11
New
New
: 1-681-879-22
– DVD BOARD (Side B) –
Former : 1-684-516-21
New
New
: 1-684-516-22
– TC BOARD (Component Side) –
Former : 1-684-172-12
New
New
: 1-684-172-32
7
HCD-M90
Ver 1.3
– MAIN BOARD (Component Side) –
Former : 1-684-232-14
New
New
: 1-684-232-16
– JACK BOARD (Component Side) –
Former : 1-685-428-11
New
New
: 1-685-428-12
– CONTROL BOARD (Component Side) –
Former : 1-685-427-11
New
New
: 1-685-427-12
8
HCD-M90
Ver 1.4
– SWITCH BOARD (Component Side) –
Former : 1-685-426-11
New
New
: 1-685-426-12
– POWER BOARD (Component Side) –
Former : 1-685-429-11
New
New
: 1-685-429-12, -21
SILVER: KHM-240AAA (TYPE A)
BLACK: KHM-270AAA (TYPE B)
BLACK: KHM-270AAA (TYPE B)
optical device
TYPE A/B DISCRIMINATION
NOTE OF REPLACING THE DVD BOARD
When replacing the DVD board, since the adjustment value is not
set up correctly, “Drive Auto Adjustment” can’t be performed.
In this case, initialize Memory in the following procedures.
set up correctly, “Drive Auto Adjustment” can’t be performed.
In this case, initialize Memory in the following procedures.
Procedure:
1. Set the test mode. (See page 18)
2. Press the
1. Set the test mode. (See page 18)
2. Press the
[2]
key of the remote commander, and set the “DRIVE
MANUAL OPERATION”. (See page 23)
3. Press the
[6]
key of the remote commander, and set the “2-6,
Memory Check”. (See page 25)
4. Press the
[CLEAR]
key of the remote commander, and initial-
ize Memory.
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