Service manual

10
Model No: 21WHS3-Bn
Version 1.0
ADJUSTMENT MODE
Item B+ adjustment, TV signal receiving
AKPH01 chassis
Measuring
Equipment
TV SG (Signal Generator)
Digital multi-meter
Preparation
Before Adj.
The set is turned on
Connect the TV SG to RF input terminal of the set.
Adjustment procedure
1, Turn VR501 potentiometer to adjust B+ to specified voltage.
2, Check voltages for video out, vertical out, circuit work and audio
power out as follow
Voltage (volt)
14 inch 21 inch
Tolerance
+B 110 110
±2V
Video Out 188 188
±5V
Vertical Out 26 26
±1V
Circuit Work 13 13
±1V
Audio Power Out 12 12
±1V
3, TV signal receiving
1. Press MENU key, to select POS.MEMORY item.
Press V+ or V- key, to select SEARCH or AUTOMEMORY
item, press P+ key to start searching.
2. Press P+ or P- key to inspect the set if there is channel skipped,
if so, searching again by SEARCH as above described.