Electrical And Service Adjustments - Beko V30 Service Bulletin

1. ELECTRICAL ADJUSTMENTS
1.1. Supply Voltage Adjustment
Connect a digital voltmeter to the cathode of diode D611 at the AV1 mode of the TV and set the
screen voltage to the minimum with the screen potentiometer. Adjust the main supply voltage (B+)
with P601 potentiometer to the following value (after adjustment, readjust Screen voltage).
21" Pure Flat
25"
28"
28" Pure Flat 16/9
28" Super Flat 16/9
29" Pure Flat
29" Super Flat
32" Pure Flat 16/9
32" Super Flat 16/9
33"
2. SERVICE ADJUSTMENTS
You need the special service remote control to enter and exit the service menu of the TV (you can
order it from the manufacturer). All buttons of the Service RC are same with the user remote control,
only service menu In / Out is added to it (please see the picture below).
Navigation
Service In/Out : Enters to / exits from the Service Menu
P+ / P- : Moves upward / downward inside the menu
V+ / V- : Changes the values or options
2.1. AGC Adjustment
• Apply an RF signal with amplitude 70±1 dBuV to the antenna input of TV with a pattern
generator (switch sound carrier to Off and switch "Video Ext" to On).
• Switch on the Service Menu with the Service RC and find the AGC with P+ / P- buttons.
Measure the 38.9 MHz signal on pin 11 (IF) of Tuner with an oscilloscope.
• Adjust "AGC" to get following values:
PAL BG, PAL SECAM BG, PAL SECAM BG-DK, PAL I versions : 840 ± 20 mVpp
PAL SECAM BG-LL version
PAL BG MONO, PAL SECAM BG MONO
PAL I MONO
• Substract 5 from "AGC" value and change "TEST" to this value.
• Exit from the service menu with the Service RC.
: 132 VDC
: 145 VDC
: 145 VDC (147 VDC for A66EAK071X11)
: 140 VDC
: 140 VDC
: 125 VDC
: 125 VDC
: 140 VDC
: 131 VDC
: 158 VDC
: 600 ± 20 mVpp
: 750 ± 20 mVpp
: 900 ± 20 mVpp