Electrical Adjustments - Sony MEX-R5 Service Manual

Q Q

ELECTRICAL ADJUSTMENTS

3 7 6 3 1 5 1 5 0
SERVO SECTION
If any of the following parts was replaced, perform the "IOP Check"
and "E, F Signal Offset Adjustment" as mentioned below.
• Optical pick-up block (chassis (OP-DVD) complete
assy or chassis (OP-DVD) sub assy)
• Mounted SERVO board
• SERVO board: IC4
R29, R30, R40, R41, R43, R44
R53, R54, R57, R58, R65, R69
RV1, RV2
Precaution
Use the following tools and measuring devices.
• Extension jig (Part No. : J-2502-094-1) 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)
• Digital voltmeter
• Oscilloscope
• Accessory remote commander
RM-X702 (E, Chinese model)
RM-X703 (AEP, UK, Russian models)
RM-X704 (US, Canadian models)
IOP CHECK
Connection:
digital voltmeter
SERVO board
T E
L 1 3 9 4 2 2 9 6 5 1 3
+
TP (IOPDVD), TP (IOPCD)
TP (A5V) –
Procedure:
1. Check the IOP value of DVD and CD by label on the optical
pick-up.
Optical Pick-up Label:
KHS-340B
*******
$$$###
CD IOP value
DVD IOP value
2. Connect a digital voltmeter to TP (IOPDVD) and TP (A5V)
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 16.5, 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 TP (IOPCD) and TP (A5V) 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 16.5, and convert it into
w w w
current value.
9. Check that the calculated value is within ±6 mA to the IOP
value given on the label.
MEX-R5
SECTION 4
E, F SIGNAL OFFSET ADJUSTMENTS
Connection:
SERVO board
TP (E), TP (F)
TP (AGND)
Procedure:
1. Connect an oscilloscope to TP (E) and TP (AGND) on the
SERVO board.
2. In the standby status, press the [4] key of the remote
commander.
3. Press the [5] key of the remote commander.
4. Press the [7] key of the remote commander for more than two
seconds.
5. When the test mode is selected, a peep sound is generated and
the LCD display becomes 6-digit hexadecimal number
(*1)
indication.
6. Playback the CD test disc (PATD-012).
7. Press the key of the remote commander.
P
8. Adjust the RV2 on the SERVO board so that waveform level
of oscilloscope becomes between 2.75 and 2.80 V as follows.
E Signal Waveform:
0 V
9. Connect an oscilloscope to TP (F) and TP (AGND) on the
SERVO board.
10. Adjust the RV1 on the SERVO board so that waveform level
of oscilloscope becomes between 2.75 and 2.80 V as follows.
F Signal Waveform:
0 V
11. Press the [RESET] button on the MAIN board, release the test
mode.
*1) In the TEST mode, if any abnormality occurred in the operation, for
instance, by pressing a wrong key, press the [RESET] button on the
MAIN board to reset the operation once, and then retry the operation.
x a o
y
. i
http://www.xiaoyu163.com
Adjustments Location:
oscilloscope
(DC range)
+
–
– SERVO Board (Side B) –
E Signal Offset Adjustment
level: 2.75 to 2.80 Vp-p
Q Q
3 7 6
level: 2.75 to 2.80 Vp-p
u 1 6 3
.
19 19
http://www.xiaoyu163.com
2 4
8 9 9
RV2
TP (IOPCD)
TP (IOPDVD)
TP (E)
TP (F)
TP (A5V)
RV1
F Signal Offset Adjustment
3 1 5 1 5 0 8 9 2
m
c o
MEX-R5
Ver. 1.1
2
8 9 9
TP (AGND)
4 9 8 2 9 9