Sony HCD-WZ7AV Service Manual ▷ View online
13
HCD-WZ7AV
2-12. BD Board, BU-30 (61) Assy
qd
two insulators
qs
insulator
7
holder (BU-30)
qa
insulator
6
two coil springs (insulator)
4
coil spring (insulator)
5
coil spring (insulator)
3
two flowting screws
(+PTPWH M2.6)
1
flowting screw
(+PTPWH M2.6)
2
flowting screw
(+PTPWH M2.6)
8
Remove the two solderings
9
Remove the two solderings
0
flat type wire (16core)
qf
BD board
qg
BU-30B assy
14
HCD-WZ7AV
[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.
set to the customer.
Procedure:
1. Press three buttons x , EQ EDIT and ?/1 simultaneously.
2. The liquid crystal display does not display any message and the
1. Press three buttons x , EQ EDIT and ?/1 simultaneously.
2. The liquid crystal display does not display any message and the
set is reset.
[MD/VIDEO Function Selection Mode]
• This mode is used to select the function of MD or VIDEO.
Procedure:
1. Press the ?/1 button to turn the set on.
2. Press the MD (VIDEO)/DVD and ?/1 buttons
Procedure:
1. Press the ?/1 button to turn the set on.
2. Press the MD (VIDEO)/DVD and ?/1 buttons
simultaneously.
3. The function will change from MD to VIDEO, and “VIDEO”
is displayed.
4. To change change back to MD , repeat the same procedure.
[AM Channel Step 9 kHz/10kHz Selection Mode]
• Either the 9 kHz step or 10 kHz step can be selected for the AM
channel step.
Procedure:
1. Set the function to AM.
2. Turn off the main power.
3. While depressing the x button, press the ?/1 button to turn
1. Set the function to AM.
2. Turn off the main power.
3. While depressing the x button, press the ?/1 button to turn
on the main power.
4. The channel step is changed over.
[CD Ship Mode (without Cold Reset)]
• 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.
after repair.
Procedure:
1. Press the ?/1 button to turn the set on.
2. Set the function to CD.
3. Press the x button and the
1. Press the ?/1 button to turn the set on.
2. Set the function to CD.
3. Press the x button and the
M (Control lever) button
simultaneously.
4. After the “STANDBY” display blinks six times, the message
“LOCK” is displayed on the liquid crystal display, and the CD
ship mode is set.
ship mode is set.
[CD Ship Mode (with Cold Reset)]
• This mode is used to perform the CD Ship Mode with Cold Reset.
Procedure:
1. Press the ?/1 button to turn the set on.
2. Set the function to CD.
3. Press three buttons x , z START (REC PAUSE) and
Procedure:
1. Press the ?/1 button to turn the set on.
2. Set the function to CD.
3. Press three buttons x , z START (REC PAUSE) and
.m – simultaneously.
4. After the “STANDBY” display blinks six times, the message
“LOCK” is displayed on the liquid crystal display, and the CD
ship mode is set.
ship mode is set.
[Disc Tray Lock]
• The disc tray lock function for the antitheft of an demonstration
disc in the store is equipped.
Setting Procedure :
1. Press the ?/1 button to turn the set on.
2. Set the function to CD.
3. Press two buttons of x and Z simultaneously for five seconds.
4. The message “LOCKED” is displayed and the tray is locked.
Releasing Procedure :
1. Press two buttons of x and Z simultaneously for five seconds
1. Press the ?/1 button to turn the set on.
2. Set the function to CD.
3. Press two buttons of x and Z simultaneously for five seconds.
4. The message “LOCKED” is displayed and the tray is locked.
Releasing Procedure :
1. Press two buttons of x and Z simultaneously for five seconds
again.
2. 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 ?/1 button.
[GC Test Mode]
• This mode is used to check the software version, key board, VACS
level, liquid crystal display and LEDs.
Procedure:
1. Press three buttons x , z START (REC PAUSE) and
1. Press three buttons x , z START (REC PAUSE) and
TUNER/BAND simultaneously.
2. Segments of the liquid crystal display and LEDs are all turned
on.
3. To enter the software version display mode, press the .m –
button. The model name and destination are displayed.
4. Each time the .m – button is pressed, the display changes
in the following order. MC, GC, CD, CDD, CDMA, CDMB,
BDA, BDB, ST, TA, TM, TC and MD. Each time the + M >
button is pressed, the contents of the version display change.
BDA, BDB, ST, TA, TM, TC and MD. Each time the + M >
button is pressed, the contents of the version display change.
5. Press the hH button, and the key check mode is activated.
6. In the key check mode, "K 0 V 0" is displayed. Each time a
6. In the key check mode, "K 0 V 0" is displayed. Each time a
button is pressed, “K 0” value increases. However, once a button
is pressed, it is no longer taken into account. “V 0” value
increases like 1, 2, 3 ... if rotaing the VOLUME knob clockwise,
or it decreases like 0, 9, 8 ... if rotating couterclockwise.
is pressed, it is no longer taken into account. “V 0” value
increases like 1, 2, 3 ... if rotaing the VOLUME knob clockwise,
or it decreases like 0, 9, 8 ... if rotating couterclockwise.
7. To exit from this mode, press three buttons in the same manner
as step 1, or disconnect the power cord.
• VACS Level Display Mode
Procedure:
1. Press three buttons x , z START (REC PAUSE) and
1. Press three buttons x , z START (REC PAUSE) and
TUNER/BAND simultaneously.
2. Press the X button. The VACS level “VACS 0” is displayed.
3. To exit from this mode, press three buttons in the same manner
3. To exit from this mode, press three buttons in the same manner
as step 1, or disconnect the power cord.
• Display Check
Procedure:
1. Press three buttons x , z START (REC PAUSE) and
1. Press three buttons x , z START (REC PAUSE) and
TUNER/BAND simultaneously.
2. Press the x button and the display changes. Each time the x
button is pressed, the pattern of segments changes.
3. To exit from this mode, press three buttons in the same manner
as step 1, or disconnect the power cord.
[VACS ON/OFF Mode]
• This mode is used to switch on and off the VACS (Variable
Attenuation Control System).
Procedure:
1. Press the ?/1 button to turn the set on.
2. To enter the test mode, press three buttons x , z START
1. Press the ?/1 button to turn the set on.
2. To enter the test mode, press three buttons x , z START
(REC PAUSE) and MOVIE MODE simultaneously.
3. The message “VACS OFF” or “VACS ON” appears.
SECTION 3
TEST MODE
15
HCD-WZ7AV
CD SECTION
Note:
1.
CD Block is basically designed to operate without adjustment. Therefore,
check each item in order given.
check each item in order given.
2.
Use LUV-P01 (Part No. 4-999-032-01) unless otherwise indicated.
3.
Use an oscilloscope with more than 10M
Ω
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.
signal level is low than specified value with the following checks.
S-CURVE CHECK
Procedure :
1. Connect an oscilloscope to TP68 (FE) and TP73 (DVC) on the
1. Connect an oscilloscope to TP68 (FE) and TP73 (DVC) on the
BD board.
2. Turn the power ON.
3. Load a disc (LUV-P01) and actuate the focus search. (In
3. Load a disc (LUV-P01) and actuate the focus search. (In
consequence of open and close the disc tray, actuate the focus
search)
search)
4. Confirm that the oscilloscope waveform (S-curve) is
symmetrical between A and B. And confirm peak to peak level
within 2
within 2
±
0.5 Vp-p.
Note:
• Try to measure several times to make sure than the ratio
of A : B or B : A is more than 10 : 7.
• Take sweep time as long as possible and light up the
brightness to obtain best waveform.
RF LEVEL CHECK
Procedure :
1. Connect an oscilloscope CH1 to TP71 (RFDC), CH2 to TP72
1. Connect an oscilloscope CH1 to TP71 (RFDC), CH2 to TP72
(RFAC) and TP73 (DVC) on the BD board.
2. Turn the power ON.
3. Load a disc (LUV-P01) and playback the number nine track.
4. Confirm that oscilloscope waveform is clear and check if RF
3. Load a disc (LUV-P01) and playback the number nine track.
4. Confirm that oscilloscope waveform is clear and check if RF
signal level is correct or not.
– BD BOARD (SIDE B) –
TP70
(TE)
TP68
(FE)
TP71
(RFDC)
TP73
(DVC)
TP72
(RFAC)
Note:
Clear RF signal waveform means that the shape “
◊
” can be clearly
distinguished at the center of the waveform.
TRAVERSE LEVEL CHECK
Procedure :
1. Connect an oscilloscope to TP70 (TE) and TP73 (DVC) on the
1. Connect an oscilloscope to TP70 (TE) and TP73 (DVC) on the
BD board.
2. Turn the power ON.
3. Load a disc (LUV-P01) and playback the number nine track.
4. Press the nN button. (Becomes the 1 track jump mode.)
5. Confirm that the level B and A (DC voltage) on the oscilloscope
3. Load a disc (LUV-P01) and playback the number nine track.
4. Press the nN button. (Becomes the 1 track jump mode.)
5. Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.
Connecting Location:
level=1.2
±
0.55Vp-p symmetry
A (DC voltage)
center of
waveform
waveform
B
DVC
1 track jump waveform
TP70 (TE)
TP73 (DVC)
BD board
+
–
–
oscilloscope
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500ns
TIME/DIV : 500ns
level : 0.75
±
0.1Vp-p (RFDC)
1.05
±
0.3Vp-p (RFAC)
+
–
–
oscilloscope
TP71 (RFDC)
TP72 (RFAC)
BD board
TP73 (DVC)
symmetry
S-curve waveform
within 2
±
0.5Vp-p
A
B
+
–
–
oscilloscope
BD board
TP68 (FE)
TP73 (DVC)
SECTION 4
ELECTRICAL ADJUSTMENT
16
HCD-WZ7AV
SECTION 5
DIAGRAMS
5-1. Circuit Boards Location
REGULATOR board
ENTER-SW board
CD-TC board
BACK LIGHT board
MAIN board
PANEL board
DPL board
VMP board
HP AMP board
MIC board
LCD board
MS-128 board
BD board
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