33
5-6-7. Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Checking Procedure :
1. Load a continuously recorded test disc (MDW-74/GA-1).
(Refer to “5-5. Using the Continuously Recorded Disc”.)
2. Rotate the MD JOG knob and display “CPLAY 1MODE” (C34).
3. Press the ENTER/YES button and display “CPLAY1 MID”.
4. Press the MENU/NO button when “C =
AD =
” is
displayed.
5. Rotate the MD JOG knob and display “FBIAS CHECK” (C16).
6. Press the ENTER/YES button and display “
/
c =
”.
The first four digits indicate the C1 error rate, the two digits
after [/] indicate ADER, and the 2 digits after [c =] indicate the
focus bias value.
Check that the C1 error is below 20 and ADER is below 2.
7. Press the ENTER/YES button and display “
/
b =
”.
Check that the C1 error is below 100 and ADER is below 2.
8. Press the ENTER/YES button and display “
/
a =
”.
Check that the C1 error is below 100 and ADER is below 2.
9. Press the MENU/NO button, next press the
A
button, and
remove the test disc.
5-6-8. C PLAY Check
MO Error Rate Check
Checking Procedure :
1. Load a continuously recorded test disc (MDW-74/GA-1).
(Refer to “5-5. Using the Continuously Recorded Disc”.)
2. Rotate the MD JOG knob and display “CPLAY1MODE” (C34).
3. Press the ENTER/YES button and display “CPLAY1 MID”.
4. The display changes to “C1 =
AD =
”.
5. If the C1 error rate is below 20, check that ADER is 00.
6. Press the MENU/NO button, stop playback, press the
A
but-
ton, and test disc.
CD Error Rate Check
Checking Procedure :
1. Load a check disc (MD) TDYS-1.
2. Rotate the MD JOG knob and display “CPLAY1MODE” (C34).
3. Press the ENTER/YES button twice and display “CPLAY1 MID”.
4. The display changes to “C1 =
AD =
”.
5. Check that the C1 error rate is below 20.
6. Press the MENU/NO button, stop playback, press the
A
but-
ton, and the test disc.
5-6-9. Self-Recording/playback Check
Prepare a continuous recording disc using the unit to be repaired
and check the error rate.
Checking Procedure :
1. Insert a recordable test disc (MDW-74/GA-1) into the unit.
2. Rotate the MD JOG knob to display “CREC 1MODE” (C35).
3. Press the ENTER/YES button to display the “CREC1 MID”.
4. When recording starts, “
REC
” is displayed, this becomes
“CREC (@@@@)” (@@@@ is the address), and recording
starts.
5. About 1 minute later, press the MENU/NO button to stop
continuous recording.
6. Rotate the MD JOG knob to display “CPLAY1MODE” (C34).
7. Press the ENTER/YES button to display “C PLAY1 MID”.
8. “C1 =
AD =
” will be displayed.
9. Check that the C1 error becomes below 20 and the AD error
below 2.
10. Press the MENU/NO button to stop playback, and press the
A
button and remove the disc.
330 k
Ω
Oscilloscope
10pF
BD (MD) board
CN105 pin
4
(TE)
CN105 pin
6
(VC)
16. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not rotate the MD JOG knob.
(Traverse Waveform)
17. Press the ENTER/YES button and display “EF CD CHECK”
(C15).
18. Press the
A
button and remove the check disc (MD) TDYS-1.
Note 1 :
MO reading data will be erased during if a recorded disc is
used in this adjustment.
Note 2 :
If the traverse waveform is not clear, connect the oscillo-
scope as shown in the following figure so that it can be
seen more clearly.
VC
A
B
Specified value : Below 10% offset value
Offset value (%) = X 100
I
A – B
I
2 (A + B)
Summary of Contents for HMC-NX5MD
Page 44: ...44 44 HMC NX5MD 6 3 SCHEMATIC DIAGRAM CD SECTION Page 50 PIN FUNCTION ...
Page 47: ...47 47 HMC NX5MD 6 6 SCHEMATIC DIAGRAM MD SECTION 1 2 48 48 48 PIN FUNCTION ...
Page 48: ...48 48 HMC NX5MD 6 7 SCHEMATIC DIAGRAM MD SECTION 2 2 47 47 47 52 52 PIN FUNCTION ...
Page 49: ...49 49 HMC NX5MD 6 8 SCHEMATIC DIAGRAM MAIN SECTION 1 2 Page 52 Page 50 Page 50 ...
Page 52: ...52 52 HMC NX5MD 6 11 SCHEMATIC DIAGRAM DIGITAL SECTION Page 48 Page 48 Page 49 PIN FUNCTION ...
Page 54: ...54 54 HMC NX5MD 6 13 SCHEMATIC DIAGRAM PANEL SECTION Page 50 ...