Sony KPR-41EXR95 Service Manual page 58

1 . Connect the HV adjustment resistance jig to R
902 of the N board.
(Adjustment
Remove the red anode lead wire foe the CRT
2.
tube from the high-voltage block and connect the
static voltmeter instead.
Receive 120 VAC power voltage and monoscope
3.
pattern signal. Set PICTURE and BRIGHTNESS
to the standard.
4 . Turn on power. To adjust the resistance of R902
with the adjustment jig to read the rated value,
31.50 It 0.50KV.
Receive all-white signal. Set BRIGHTNESS to the
5.
standard. Maximize PICTURE. Confirm that the
rated value, 31.50&0.50KV is read.
Cut off RGB by VP26, 27, 28 of the service
6.
commander. Verify that the rated value, 31.50f
1 . Receive 130 -I- 1 VAC power voltage and
monoscope pattern signal. Set BRIGHTNESS to
standard and maximize PICTURE.
Connect a digital multimeter between the ll5V
2.
line and the ground on the G board, and confirm
that the rated value, 115.0$?d"V is read.
TER P
AF RE
1 . When replacing IC601, check the B+ voltage.
i
jig)
G
LACIN
CHECKING TEE OVP
CIRCUIT (8R652)
1. Receive 120 VAC power voltage and monoscope
pattern signal. Maximize PICTURE and
BRIGHTNESS.
2. Remove R638 from the G board and connect a
variable resistor (4.7 to 10kfi)
3. Turn the variable resistor of lOk0 and confirm
that the OVP circuit is activated and luster
disappears when B+ voltage reads the rated value,
125.0 + 5.OVDC.
BEAM CURRENT PROTECTOR ADJUSTMENT
1 . Receive 120 VAC power voltage and monoscope
pattern signal. Maximize BRIGHTNESS.
2.
(on the N board)
Remove the jumper connector from the N-8
3.
connector on the N board. Then connect an ABL
ammeter between pin 0 and pin @ of the N-8
connector.
Raise PICTURE current gradually. Confirm that
4.
the beam current protector circuit is activated
and luster disappears under the rated value, 3400
5.
Verify that the protector circuit is activated and
luster disappears similarly.
(overvoltage protection)
instead.
ABL ammeter