Sony MZ-E900 Service Manual page 12

MZ-E900
5-4-3. Vc PWM Duty (H) adjustment method
1. Set the Manual mode and set the item No. to 763.
LCD display
763 VchPWM XX
2. Connect a digital voltmeter to TP901(VC) on the main board
and adjust + key and – key on the remote control.
Adjustment value:2.75V
Standard value:2.735 to 2.765V
MAIN BOARD (SIDE A)
R903
28 25 20
29
C905
30
IC901
R901
35
40
42
43 45 50
C911 C915
C917
R950
TP901 (VC)
digital voltmeter
TP901 (VC)
3. Press X key to write the adjustment value.
5-4-4. Vl PWM Duty adjustment method
1. Set the Manual mode and set the item No. to 764.
LCD display
764 VlPWM XX
2. Connect a digital voltmeter to TP917 (VL) on the main board
and adjust + key and – key on the remote control.
Adjustment value:2.23V
Standard value:2.22 to 2.235V
digital voltmeter
MAIN BOARD (SIDE A)
TP917
(VL)
3. Press X key to write the adjustment value.
LCD display
000 ADJ OK
12
D903
15
14
C918
10
R920
5 R921
1
55 56
TP917
(VL)
D902
L902
5-4-5.Electrical offset adjustment method
Note: Doing adjustment by the state that a disc does not enter.
1. Confirm the power voltage is 1.5V.
2. Set to the test mode.
3. Press the – key activates the overall adjustment mode.
LCD display
000 Assy11
4. Press the DISPLAY key.
LCD display
030 Ofst**
5. If result of electrical offset adjustment is OK,the following dis-
play appears.
LCD display
030 OfstOK
5-5. OVERALL ADJUSTMENT MODE
5-5-1. Overall adjustment mode structure
TEST MODE
(Display Check Mode)
VOLUME – key
Overall Adjustment
Title Display(ASSY**)
key
.
key
> N
DISPLAY key
PLAY MODE key
Note: The overall adjustments should be always performed in the
sequence of CD t MO adjustments.
5-5-2. Overall CD and MO adjustment method
1. Set the TEST MODE and press – key to set the Overall Ad-
justment mode.
LCD display
000 Assy11
2. Insert CD disc in the set, and press . key to set the Overall
CD Adjustment mode.
Automatic adjustments are made.
LCD display
XXX CD RUN
XXX: Item No. for which an adjustment is being executed.
key
x
CD overall
Adjustment
key
> N
key
x
MO overall
Adjustment
key
x
Electrical offset
Adjustment key
key
x
Power Supply
Adjustment