Vc Pwm Duty (H) Adjustment Method; Vrem Pwm Duty (H) Adjustment Method; Overall Adjustment Mode; Overall Adjustment Mode Structure - Sony MZ-E90 Service Manual

5-4-4. Vc PWM Duty (H) adjustment method

1. Set the Manual mode and set the item No. to 765. (See page 12)
LCD display
765 VchPWM
2. Connect a digital voltmeter to TP901 on the main board and
adjust + key and – key on the remote control so that the
voltage is at 2.75V ± 15 mV.
Main board
TP901 (VC)
TP912 (GND)
3. Press X key to write the adjustment value.
Note : Do not Press the X key if the adjustment value is already
set.

5-4-5. Vrem PWM Duty (H) adjustment method

1. Set the Manual mode and set the item No. to 766. (See page 12)
LCD display
766 VrhVch
2. Connect a digital voltmeter to TP903 on the main board and
adjust + key and – key on the remote control so that the
voltage is at 2.6 ± 15 mV.
Main board
TP903 (VR)
TP912 (GND)
3. Press X key to write the adjustment value.
Note : Do not Press the X key if the adjustment value is already
set.
MAIN BOARD (SIDE B )
IC901
TP912
TP901
Digital
voltmeter
Digital
voltmeter
TP903
IC501
IC552
CN501
– 16 –

5-5. OVERALL ADJUSTMENT MODE

5-5-1. Overall adjustment mode structure

TEST MODE
(Display Check Mode)
. key
key
x
.
key
> N
key
x
Note: The overall adjustments should be always performed in the
sequence of CD t MD adjustments.

5-5-2. Overall CD and MO adjustment method

1. Set the TEST MODE (see page 11) and press – key to set the
Overall Adjustment mode.
LCD display
000 AssyFF
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.
3. If NG in the overall CD adjustments, return to Reset NV and
perform the adjustment again.
LCD display
XXX NG
XXX: NG item No.
4. If OK through the overall CD adjustments, then perform overall
MO adjustments.
LCD display
XXX CD OK
5. Insert MO disc in the set, and press > N key to set the
Overall MO Adjustment mode. Automatic adjustments are made.
LCD display
XXX MO RUN
XXX: Item No. for which an adjustment is being executed.
Overall CD Adjustment
key
key
> N
Overall MO Adjustment