CMT-C7NT, HCD-C7NT - Sony Audio Service Manual (repair manual). Page 24

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24
HCD-C7NT
[Factory Preset Mode]
∗
This mode clears all data including preset data stored in the
RAM to initial conditions. Excute this mode when returning
the set to the customer.

Procedure:
1. Press the  ?/1  button to turn the power on.
2. Press the  
FUNCTION 
z  button to set the CD function.
(except the TUNER function)
3. Press three buttons  
VOL +
 , 
 CD 
Z  and 
 MD 
Z
simultaneously.
4. The message “COLD RESET” blinks and the present contents
are reset to the default values.
[Version and Destination Display Mode]
∗
The version or destination is displayed.

Procedure:
1. Press the  ?/1  button to turn the power on.
2. To enter the test mode, press the three buttons  
VOL +
 ,  x
and 
 MD 
Z  simultaneously.
3. The model and destination are displayed.
4. Press the  
REC/REC IT/NORMAL
  and  u  buttons simul-
taneously.
5. The version is displayed as “STR/CD V   .    ”.
6. Press the  
REC/REC IT/NORMAL
  and  u  buttons simul-
taneously.
7. The version is displayed as “MD V   .    ”.
8. Press the  
REC/REC IT/NORMAL
  and  u  buttons simul-
taneously, then the mode returns to step 3.
9. To exit from this mode, press the  ?/1  button to turn the
power off.
[FL Tube Test  Mode]
∗
All fluorecent segments and LEDs are tested.

Procedure:
1. Press the  ?/1  button to turn the power on.
2. To enter the test mode, press three buttons  
VOL +
 ,  x  and
./m 
TUNING -
  simultaneously.
3. All segments and LEDs are turned on.
4. Press the  
REC/REC IT/NORMAL
  and  u  buttons simul-
taneously.
5. All segments are turned off (All LEDs still lit).
6. Press the  
REC/REC IT/NORMAL
  and  u  buttons simul-
taneously.
7. Almost half segments are turned on. (PATTERN 1)
8. Press the  
REC/REC IT/NORMAL
  and  u  buttons simul-
taneously.
9. The segments which are turned on in step 7 are turned off,
then remaining segments are turned on. (PATTERN 2)
10. Press the  
REC/REC IT/NORMAL
  and  u  buttons simul-
taneously, the mode returms to step 3 and all segments are
turned on.
11. To exit from this mode, press the  ?/1  button to turn the
power off.
[Key Test  Mode]
∗
Keyboard check.

Procedure:
1. Press the  ?/1  button to turn the power on.
2. To enter the test mode, press three buttons  
VOL +
 ,  x  and
>/M 
TUNING +
  simultaneously.
3. In the key test mode, the fluorecent indicator displays
“KEY00”.
4. Each time a button is pressed, “KEY    ” value increases.
However, once a button is pressed, it is no longer taken into
account.
5. To exit from this mode, press three buttons simultaneously as
step 2 , or disconnect the power cord.
[Amp Test  Mode]

Procedure:
1. Press the  ?/1  button to turn the power on.
2. Press three buttons  
VOL -
 , 
 CD 
Z   and 
 MD 
Z   simulta-
neously.
3. Press two buttons  
REC/REC IT/NORMAL
  and  x  simulta-
neously.
4. The message “7 [TESTMIN]” is displayed for a few seconds.
5. Press two buttons  
REC/REC IT/NORMAL
  and  x  simulta-
neously again.
6. Each time two buttons are depressed, the display changes as
“8 [TESTMID]” , “9 [TESTMAX]”, and “10 [TESTSUR]” .
7. Press the  
VOL +
  button, the display changes “VOLUME 21”
to “VOLUME MAX”.
8. Press the  
VOL -
  button, the display changes “VOLUME 21”
to “VOLUME MIN”.
9. To exit from this mode, press the  ?/1  button to turn the
power off and cold reset is executed.
[CD Test  Mode]
∗
The CD system versions are displayed.

Procedure:
1. Press the  ?/1  button to turn the power on.
2. Press the  
FUNCTION 
z  button to set the CD function.
3. Press three buttons of  
VOL +
 ,  x  and 
 CD SYNC HIGH
simultaneusly.
4. The message “dut CD VER” is displayed.
5. Press the 
 CD 
Z  button and the version “CD   .    ” is dis-
played.
6. Press the  >/M 
TUNING +
  button and “CDSYS        ”
is displayed.
7. Each time the  >/M 
TUNING +
  button is depressed ,
the display changes as “CDMA S”, “CDBDU”, “CDBDL”,
“CDMU”, “CDML”.
8. By depressing the  ./m 
TUNING -
  button the versions
are displayed in reverse.
9. To exit this mode, press the  ?/1  button to turn the power off.
SECTION 4
TEST MODE
GROUP
DISC GROUP
L-SYNC SHUF
Display
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