Sylvania 6842PE M, Service Manual, Page: 72 / 82

2-1-6 L0604DCP
(2) YBU, YBL and/or YM
How to adjust waveform
YBU
YBL
YM
Connectors
CN5008
CN5001
Connectors
FPC
Connectors
1. Disconnect all FPC connectors of YBU and YBL.
2. Disconnect the connectors of CN5001 and
CN5008 on YM.
3. Unscrew all screws of YBU, YBL, and YM.
4. Take out the boards from the chassis.
5. Disconnect the connectors between YBU, YBL
and YM.
6. Take out the YBU and YBL from YM.
Reassembly Notes:
1. After re-assembling YBU, YBL and YM, turn on
the module and check the waveform for the Driv-
ing board. (refer to “How to adjust waveform”
below.)
2. If the waveform is adjusted, then turn off the set.
YM
VR5004
VR5002
TP: Vsch
VR5003
VR5001
: Test point : Volume
VR5004 Adjustment : Vsch TP => 40volt
VR5002 Adjustment :
Vset flat time : Typ. 10
µ
sec
VR5003 Adjustment :
falling flat time => Typ. 30
µ
sec
=> Max. 50
µ
sec
=> Min. 0
µ
sec
VR5001 Adjustment :
3th SF falling flat time => Typ. 30
µ
sec
=> Max. 50
µ
sec
=> Min. 0
µ
sec
Vs
NOTE:
Pay close attention to above adjustment order.