Akai PDP4216M, Service Manual, Page: 65 / 86

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1. Checking for no Picture
A screen doesn’t display at all and condition of black pattern or power off.
(1) Check whether the CTRL B/D LED(D1, D14) is turned on or not.
(2) Check the power and signal cable of CTRL B/D.
(3) X B/D, Y B/D, Z B/D is well plugged in.
(4) Check the connection of X B/D, Y B/D and Z B/D to CTRL B/D.
(5) Measure the output wave of X, Y, Z B/D with oscilloscope(more than 200MHz)
and find the trouble of B/D by comparing the output wave with below figure.
- Measure Point fo Y B/D : TP(Bead B1)
- Measure Point fo Z B/D : TP(Bead B1)
(6) Check the SCAN(Y side) IC
(7) Check the DATA(X side) TCP IC
(8) Replace the CTRL B/D.
Ⅲ
. Trouble Shooting
<A: Y B/D Output wave - 1 FRAME>
<B: Y B/D Output wave - 1 SF>
<A: Y B/D Output wave - 1 FRAME>
<B: Y B/D Output wave - 2, 3, 4 SF>
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