Sylvania 6842PE Service Manual page 72

(2) YBU, YBL and/or YM
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.
How to adjust waveform
VR5004
TP: Vsch
VR5001
VR5002
VR5003
YM
: Test point : Volume
NOTE:
Pay close attention to above adjustment order.
VR5004 Adjustment : Vsch TP => 40volt
VR5002 Adjustment :
Vset flat time : Typ. 10µsec
VR5003 Adjustment :
falling flat time => Typ. 30µsec
FPC
Connectors
Vs
=> Max. 50µsec
=> Min. 0µsec
2-1-6
YBU
Connectors
CN5008
YM
CN5001
Connectors
YBL
VR5001 Adjustment :
3th SF falling flat time => Typ. 30µsec
=> Max. 50µsec
=> Min. 0µsec
L0604DCP