Pioneer PDP-507XD Service Manual page 122

1
3 Actual Vofs adjustment (2)
A
Set to RST MASK 03 (green 1023).
Set VOL OFFSET to 246 (60 [V] ).
Are there any dark cells?
B
Gradually decrease the Vofs data
until dark cells disappear (Vofs should
be 005 (15 [V]) or more).
Is Vofs_max3 118 (36 [V])
Set to RST MASK 04 (blue 1023).
C
Set VOL OFFSET to 246 (60 [V] ).
Are there any dark cells?
Gradually decrease the Vofs data
until dark cells disappear (Vofs should
be 005 (15 [V]) or more).
D
Is Vofs_max4 118 (36 [V])
Set the lowest voltage among Vofs_max1, Vofs_
max2, Vofs_max3, and Vofs_max4 as Vofs_max.
E
Is Vofs_max 187 (49 [V])
Value for Vofs = Vofs_max - 48 (9 [V])
Set the value as Vofs.
F
122
1
2
(From 2 )
(Check the upper limit of Vofs with the green 1023 signal.)
MKS S53
VOF 246
Yes
VOF ∗∗∗
or greater?
Yes
(Check the upper limit of Vofs with the blue 1023 signal.)
MKS S54
VOF 246
Yes
VOF ∗∗∗
or greater?
Yes
or greater?
No
(To 4 )
2
3
No
Set Vofs_max3 to 246 (60 [V]).
Note:
This setting value becomes the value
for Vofs_max3.
Replace the panel
No
again or abnormality
in circuits
No
Set VOL OFFSET_max4 to 246 (60 [V]).
Note:
This setting value becomes the value
for Vofs_max4.
Replace the panel
No
again or abnormality
in circuits
Yes
Value for Vofs = 139 (40 [V])
PDP-507XD
3
4
Vofs_max3
[V]
Note: Take note of the value
for Vofs_max1.
Vofs_max4
[V]
Note: Take note of the value
for Vofs_max2.
Vofs_max
[V]
4