Electrical Adjustments - Sony MZ-E505 Service Manual

MZ-E505
5-1. GENERAL
In this set, CD and MO discs can be automatically adjusted by set-
ting the Overall Adjustment mode within the TEST MODE,
Before performing these automatic adjustments, it is necessary to
clear the memory and adjust the power in the Manual mode.
5-2. NOTES FOR ADJUSTMENT
5-2-1. Jigs
• CD disc TDYS-1 (part code: 4-963-646-01)
• MO disc PTDM-1 (part code: J-2501-054-A)
or commercially available MO disc (recorded)
• Digital voltmeter
• Ammeter
5-2-2. Adjustment sequence
The adjustments should be always performed in the following
sequence:
1 Reset NV (Clear the memory)
2 Manual power adjustments
Electrical offset adjustments
3
(Do not enter the disc)
4 Overall CD adjustments
5 Overall MO adjustments
RESUME clear
6
7 Rewrite the NV value
5-2-3. Power
The power is supplied with 1.5 V DC from the battery case.
5-3. RESET NV
5-3-1. How to reset NV
1. Set the TEST MODE.
2. Set the Manual mode and set the item No. 021, Reset NV.
LCD display
021 Res NV CC
3. Press X key on the remote control.
LCD display
021 Res OK?
4. Press X key on the remote control again.
LCD display
021 Res ***
After reset is completed.
021 Reset!
5. Press x key to terminate the Manual mode and return to the
TEST MODE.
18
SECTION 5

ELECTRICAL ADJUSTMENTS

Manual mode
Overall adjustment mode
5-4. MANUAL POWER ADJUSTMENTS
5-4-1. Adjustment sequence
The adjustments should be always performed in the following se-
quence:
1 Vc PWM Duty (L) adjustment (item No.:762)
r
2 Vl PWM Duty adjustment (item No.:764)
r
3 Vb A/D value check (item No.:731)
5-4-2. Vc PWM Duty (L) adjustment
Connection:
MAIN board
TP901 (VC)
TP921 (GND)
Procedure:
1. Confirm that the power voltage is at 1.5 V DC.
2. Set the TEST MODE.
3. Set the overall adjustment mode and press PLAYMODE key,
item No. will change to 762.
LCD display
762 VclPWM XX
4. Connect a digital voltmeter to TP901 (VC) and TP921 (GND)
on the main board and adjust VOL + (voltage up) and VOL –
(voltage down) on the remote control.
Adjustment value:2.35V
Standard value:2.34 to 2.355V
5. Press X key to write the adjustment value.
digital
voltmeter