JVC AV-56WP30 Service Manual page 33

ADJUSTMENT
CHECK ITEMS
Measuring
Item
instrument
B1 Signal generator
POWER SUPPLY
check DC voltmeter
HIGH VOLT AGE Signal generator
check
High voltage
meter
X-RAY Resistor
PROTECTOR 6.8kΩ Ω Ω Ω 1/6W
check
± ± ± ± 5%
HORIZONTAL FREQUENCY ADJUSTMENT
Measuring
Item
instrument
H. FREQUENCY Signal
adjustment gener ator
Remote
control unit
Test point Ad justment part
S1 connector
5 pin:TP-91
#
1 pin:TP-E( )
CRT Anode
S1 connector
2 pin:X-Ray2
3 pin:X-Ray1
Test point Ad justment part
D15 : H. FREQ.
D19 : DEF. RST
No. 52007
Description
1. Receive a NTSC black & white signal (c olor off).
2. Connect the DC voltmeter to TP-91 (S1 connector 5
# # # #
pin) and TP-E( ) (S1 c onnector 1 pin).
3. Confirm that the voltage is DC140V±2V.
1. Receive a NTSC whole blac k signal.
2. Connect the high voltage meter between CRT anode
and GND.
3. Check that the high voltage DC 31.0kV ±1.0kV.
1. Receive any broadc ast.
2. Connect resistor 6.8kΩ(1/6W, ±5%) between 2 pin &
3 pin of the c onnector S1.
3. Confirm that the X-RAY protector func tions operated.
Description
1. Receive any broadc ast.
2. Pres et from 0 to 1 for D19 <DEF. RST ＞ .
3. While observing the screen, adjust the D15 ＜ H. FREQ
＞ so that an optimum horizontal synchronization is
obtained.
4. After adjustment, to pres et from 1 to 0 for D19 <DEF .
RST ＞.
5. Press the MUTING key to memorize the set value.
AV-56WP30
33