Safety Related Adjustments; Checking Ocp Operation; Confirmation Of V-Protector; Checking Power Supply Voltages - Sony Trinitron KV-AR29T80C Service Manual

[A BOARD]

5-1. CHECKING OCP OPERATION

1) Receive WHITE PATTERN
PICTURE : DYNAMIC
2) Connect 90ohm / 20W RESISTOR R511 between D505 an-
ode and GND.
3) Check if the voltage at D506 cathode goes over 4.6V.
4) Immediately after checking, the resistor has to be discon-
nected.
R511
L505
D505
R512
R514
C508

5-2. CONFIRMATION OF V-PROTECTOR

1) Short D557.
2) Check if the voltage at D551 cathode goes over 4.6V.
3) Immediately after checking, the resistor has to be discon-
nected.

5-3. CHECKING POWER SUPPLY VOLTAGES

Feed the mono-scope or color bar siganal and confirm the
following voltages.
1) +B line voltage(135V)
Adjust R654.
Measure between C654 +ve & GND.
Specification: 135V ± 1.0 V
2) 12V line voltage
Measure between C661 +ve & GND.
Specification: 13.5 V ± 2.0 V
3) 8V line voltage
C662 +ve & GND.
Specification: 8.0V ± 0.5 V
4) 5V line voltage
C664 +ve & GND.
Specification: 5.05V ± 0.5 V
5) STBY-5V line voltage
C652 +ve & GND.
Specification: 5.0V ± 1.0 V
6) 3.3V line voltage
C657 +ve & GND.
Specification: 3.3V ± 0.15 V
7) FBT + 15V LINE
Measure line voltage between +C557 & -C557 (GND)
Specification: 13.3V ± 0.5 V
8) FBT - 15V LINE
Measure line voltage between -C558 & +C558 (GND)
Specification: -14.9V ± 0.6 V
SECTION 5

SAFETY RELATED ADJUSTMENTS

+B
Add resistor 90Ω/20W
KV-AR29T80C/AR29X80C
– 19 –
RM-W104 RM-W104