Diagrammatic View Of The Y Drive Assy; Diagrammatic View Of The X Drive Assy - Pioneer PDP-5020FD Service Manual

5
Adjustable Range
Voltage to be
Assy Name
Checked (V)
60-inch
VSNOFS 040 to 085
VYRST 001 to 056
VKNOFS1_2 054 to 107
Y DRIVE
Assy
065 to 117
VKNOFS3
VKNOFS4 111 to 164
XKOFS1 105
X DRIVE
XKOFS2 063
Assy
(*1): These parts have not been mounted.
(*2): It is recommended to measure the DAC output voltage with the drive off.
(*3): View when the Assy is mounted on the unit and viewed from the rear.

Diagrammatic view of the Y DRIVE Assy

E
G
C
5
6
Measurement Point
Output at the
50-inch DAC Output (*2)
Last Stage
101 to 157 CN2404 (*1) Lower side of R2723 (*3)
001 to 074 CN2401 (*1) Upper side of R2621 (*3)
121 to 164 CN2405 (*1) Left side of R2754 (*3)
107 to 149 CN2403 (*1) Right side of R2757 (*3)
151 to 193 CN2406 (*1) Right side of R2755 (*3)
085 CN1302 (*1) K1402 (*1)
047 CN1301 (*1) K1401 (*1)
D A F
B
PDP-5020FD
6
7
Computation Formula for Voltage (Absolute Value)
Computation Using
DAC Output Voltage (V)
VOFS_ADJ × 13.91 + 55.54
VYPRST_ADJ × 62.495 + 75.2
YVKNOFS1_ADJ × 36.85 + 159.3
YVKNOFS3_ADJ × 36.85 + 159.3
YVKNOFS4_ADJ × 36.85 + 159.3
XKNOFS1_ADJ × 27.3 + 30
XKNOFS2_ADJ × 25.0 + 69.8
(*4): The value calculated using an adjustment value may be different from the
value measured at the last output stage, because various corrections such
as temperature correction are not taken into consideration.

Diagrammatic view of the X DRIVE Assy

H
J
I
7
8
Computation Using Adjustment
Value (*4)
VOF value × 0.18 + 9.6
VRP value × 0.81 + 74.4
(V1F value+VYF value-128)
× 0.48 + 158.8
(V3F value+VYF value-128)
× 0.48 + 158.8
(V4F value+VYF value-128)
× 0.48 + 158.8
VX1 value × 0.35 + 29.7
VX2 value × 0.32 + 69.5
A R2754,R2755,R2757
B R2723
C R2621
D CN2405
E CN2403,CN2406
F CN2404
G CN2401
H K1401
I K1402
J CN1301,CN1302
55
8
A
B
C
D
E
F