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Model
CMT-M100MD HCD-M10
Pages
92
Size
7.05 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cmt-m100md-hcd-m10.pdf
Date

Sony CMT-M100MD / HCD-M10 Service Manual ▷ View online

26
HCD-M10
7. AUTOMATIC SELF-DIAGNOSIS FUNCTION
This test mode performs CREC and CPLAY automatically for mainly checking the characteristics of the optical pick-up.
To perform this test mode, the laser power must first be checked.
Perform AUTO CHECK after the laser power check and Iop Compare.
Procedure:
1.
Press the ENTER/YES “R” button. If “LDPWR 
 ” is displayed, it means that the laser power check has not been performed.
In this case, perform the laser power check and Iop Compare (C27), and then repeat from step1.
2.
If a disc is in the mechanical deck, it will be ejected forcibly.
“DISC IN” will be displayed in this case. Load a test disc (MDW-74/GA-1) which can be recorded.
3.
If a disc is loaded at step 2, the check will start automatically.
4.
When “XX CHECK” is displayed, the item corresponding to XX will be performed.
When “06 CHECK” completes, the disc loaded at step 2 will be ejected. “DISC IN” will be displayed. Load the check disc (TDYS-1).
5.
When the disc is loaded in step 4, the check will automatically be resumed from “07 CHECK”.
6.
After completing to “12 CHECK”, check OK or NG will be displayed. If all items are OK, “CHK ALL OK” will be displayed. If any
item is NG, it will be displayed as “NG:xxxx”.
When “CHK ALL OK” is displayed, it means that the optical pick-up is normal. Check the operations of other parts (spindle motor, sled
motor, etc.).
When displayed as “NG:xxxx”, it means that the optical pick-up is faulty. In this case, replace the optical pick-up.
27
HCD-M10
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Adjustment Location:
3. Mode: Playback
test tape
P-4-A100
(10kHz, –10dB)
oscilloscope
set
Waveform of oscilloscope
in phase
45
°
90
°
135
°
180
°
good
wrong
GND
R-ch
L
R
J301
 PHONES
Output Terminal
32 
32 
Tape Speed Check
Procedure:
1. MODE : Playback.
test tape
WS-48B
(3kHz, 0dB)
J301
 PHONES
Output Terminal
frequency
counter
set
32 
(Top view)
Adjustment point
2. Insert the WS-48B into deck.
3. Press the  Y  button of deck.
4. Check the reading of frequency counter becomes 3000 
±
 90 Hz.
Sample Value of Wow and flutter
W.RMS (JIS) less than 0.3%
(test tape: WS-48B)
Note:
 Standard Volume Point is –10 dBs at PHONES Output Level (32
load resistance) during playbacking P-4-L300 Test Tape.
(DSG OFF, TREBLE/BASS CENTER)
Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode : Playback
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw so
that outputs match within 1 dB of peak.
L-CH
peak
R-CH
peak
screw
position
output
level
within
1 dB
L-CH
peak
R-CH
peak
screw
position
within 1dB
DECK SECTION
0 dB=0.775V
1. Demagnetize the record/playback head with a head demagne-
tizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjusted.
4. The adjustments should be performed with the rated power sup-
ply 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 ad-
justment.)
6. The adjustments should be performed for both L-CH and R-
CH.
7. Switches and controls should be set as follows unless other-
wise specified.
SECTION 5
ELECTRICAL ADJUSTMENTS
test tape
P-4-A100
(10kHz, –10dB)
J301
 PHONES
Output Terminal
level meter
set
+
32 
Tape
P-4-A100
WS-48B
P-4-L300
10 kHz, –10 dB
3 kHz, 0 dB
315 Hz, 0 dB
Azimuth Adjustment
Tape Speed Adjustment
Level Adjustment
Signal
Used for
28
HCD-M10
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
 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.
RF Level Check
Procedure :
1. Connect oscilloscope to TP (RFAC).
2. Turn the power on.
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check RF signal
level is correct or not.
Note:
Clear RF signal waveform means that the shape “
” can be
clearly distinguished at the center of the waveform.
E-F Balance (1 Track jump) Check
Procedure:
1. Connect oscilloscope to TP (TE) and TP (DVC 1.65V).
2. Turn the power on.
3. Load a disc (YEDS-18) and playback the number five track.
4. Press the  u  button. (Becomes the 1track jump mode.)
5. Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.
Specification level:      
                x
 100=less than 
±
22%
TP(RFAC)
TP(DVC 1.65V)
CD BOARD
oscilloscope
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 1.1 
±
 0.3Vp-p 
CD BOARD
Oscilloscope
TP(TE)
TP(DVC 1.65V)
0V
Center of
waveform
B
Symmetry
A (DC voltage)
B=1.3 
±
0.6Vp-p
Record Level Check
Procedure:
1. Press  FUNCTION  button to select ANALOG IN.
2. Insert a tape into deck, press the  z TAPE  button, and then press
the  X  TAPE   button to start recording.
3. Mode: Record
4. Mode: Playback
5. The playback output  level should be –2 
±
4 dBs (60 Hz),
–1 
±
4 dBs (8 kHz) and –3 
±
4 dBs (10 kHz) compared with 315Hz
playback level.
AF OSC
     PJ301
ANALOG IN
1) 315 Hz
2) 60 Hz
3) 5 kHz
4) 10 kHz
blank tape
CS-123
set
attenuator
600 
109 mV (–17 dB)
recorded
position
level meter
set
32 
J301
 PHONES
1.3
±
0.6Vp-p
 A
29
HCD-M10
RF PLL Free-run Frequency
Procedure :
1. Connect frequency counter to TP (XPCK) with lead wire.
2. Turn the power on.
3.  Put the disc (YEDS-18) in to play the number five track.
     Confirm that reading on frequency counter is 4.3218MHz.
Test Point Location :
[CD BOARD] — SIDE B —
+
frequency counter
CD BOARD
TP (XPCK)
TP
(DVC 1.65V)
TP
(TE)
IC101
IC103
TP 
(XPCK)
TP 
(RFAC)
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