Electrical Adjustments - Sony MEX-DV1000 Service Manual

ELECTRICAL ADJUSTMENTS

SERVO SECTION
If any of the following parts was replaced, perform the "IOP Check"
and "E, F Signal Offset Adjustments" as mentioned below.
• Optical pick-up block (chassis (OP, Z) complete assy
or chassis (OP, Z) sub assy)
• Mounted SERVO board
• SERVO board: IC2
R4, R5, R7, R8, R9, R10, R19, R27,
R28, R29, R31, R34, RV1, RV2
Precaution
Use the following tools and measuring devices.
• Extension jig (Part No. : J-2502-107-1) between the SERVO
board and the MAIN board
• DVD test disc TDV-540C (Part No. : 7-819-098-53)
• CD test disc PATD-012 (Part No. : 4-225-203-01)
• Driver for adjustment
• TV moniter
• Digital voltmeter
• Oscilloscope
• Accessory remote commander
RM-X161 (DV2000: US and Canadian models)
RM-X162 (DV2000: Russian model)
RM-X163 (DV2000: E, Indian and Chinese models)
RM-X166 (DV1000: AEP, UK and Russian models)
RM-X167 (DV1000: E, Indian and Chinese models)
IOP CHECK
Connection:
digital voltmeter
SERVO board
+
TP51 (IOPDVD), TP47 (IOPCD)
TP63 (A3.3V) –
Procedure:
1. Check the IOP value of DVD and CD by label on the optical
pick-up.
Optical Pick-up Label:
A******
$$$ ###
********
CD IOP value
DVD IOP value
2. Connect a digital voltmeter to TP51 (IOPDVD) and TP63
(A3.3V) on the SERVO board.
3. Playback the DVD test disc (TDV-540C), and make a note of
the value of digital voltmeter.
4. Divide the measured voltage value by 1, and convert it into
current value.
5. Check that the calculated value is within ±6 mA to the IOP
value given on the label.
6. Connect a digital voltmeter to TP47 (IOPCD) and TP63
(A3.3V) on the SERVO board.
7. Playback the CD test disc (PATD-012), and make a note of
the value of digital voltmeter.
8. Divide the measured voltage value by 1, and convert it into
current value.
9. Check that the calculated value is within ±6 mA to the IOP
value given on the label.
SECTION 4
E, F SIGNAL OFFSET ADJUSTMENTS
Connection:
oscilloscope
(DC range)
SERVO board
TP58 (E), TP57 (F) +
–
TP45 (OPGND)
Procedure:
1. Connect an oscilloscope to TP58 (E) and TP45 (OPGND) on
the SERVO board.
2. Connect a TV moniter to VIDEO OUT jack of the set.
3. Insert the CD test disc (PATD-012).
4. Detach the front panel of the set.
5. Press the [RESET] button of the set in the state of chucking.
6. Attach the front panel of the set.
7. Escape the setup of the set (It becomes a clock display).
8. In the standby status, press the [4] key of the set or the remote
commander.
9. Press the [5] key of the set or the remote commander.
10. Press the [DSPL] key of the set or the remote commander for
more than two seconds.
11. When the test mode activated, it is display in the TV monitor
as shown in the figure below.
12. Press the [7] key of the remote commander.
13. Adjust the RV2 on the SERVO board so that waveform level
of oscilloscope becomes between 2.65 and 2.70 V as follows.
E Signal Waveform:
0 V
level: 2.65 to 2.70 Vp-p
14. Connect an oscilloscope to TP57 (F) and TP45 (OPGND) on
the SERVO board.
15. Adjust the RV1 on the SERVO board so that waveform level
of oscilloscope becomes between 2.65 and 2.70 V as follows.
F Signal Waveform:
0 V
level: 2.65 to 2.70 Vp-p
16. Press the [9] button on the remote commander to stop the CD
test disc.
Note: When you feel the doubt in the operation of the test mode in each
adjustment and check item, enter the test mode again once after
pressing the [RESET] button of the set.
Adjustments Location:
– SERVO Board (Conductor Side) –
TP45
(OPGND)
TP47
TP51
(IOPCD) (IOPDVD)
RV1
F Signal Offset Adjustment
TP63
(A3.3V)
17 17
MEX-DV1000/DV2000
TP58
(E) RV2
TP57 E Signal Offset Adjustment
(F)