—
15
—
KV-32S42/32S66/32V42/35S42/35S66/35V42
Step 1 Preparation before Confirmation
Turn the POWER switch ON.
Input a white signal and set the PICTURE and BRIGHT
controls to maximum.
Confirm that the voltage of more than 18.0 VDC
appears between TP85 and ground on the A Board at
AC Input: 120.0
± 0.2 VAC.
Step 2
Input a white signal and verify that I ABL is within the
specified range:
2160 ± 100
µ
A (KV-35S42/S66/V42)
or 2000 ± 100 µA (KV-32S42/S66/V42).
At AC input: 120.0 ± 2.0 VAC
+
I ABL
ABL
T503
FBT
range
-
ammeter
3.0 mA DC
A
Step 3
Record the voltage between TP85 and ground.
Step 4
Using an external DC power supply, apply voltage
between TP85 and ground.
Increase the voltage gradually and confirm that the
holdown works (raster disappears) at lower than the
voltage recorded in Step 3.
Lower than 22.05
+0.0/-0.1
VDC
(KV-35S42/S66/V42)
or 26.95 +0.0/-0.1 VDC
(KV-32S42/S66/V42)
at AC input: 120.0 ± 2.0 VAC.
SECTION 4
SAFETY RELATED ADJUSTMENTS
4-1.
R530, R531 CONFIRMATION METHOD
(HOLD-DOWN CONFIRMATION) AND
READJUSTMENTS
Always perform the following adjustments when replacing the
following components marked with a
mark on the schematic
diagram:
3mA DC range
+
-
+
-
A
+
-
11
T503
FBT
TP85
T503
FBT
TP85
R531
R530
DC Power Supply
digital multimeter
ammeter
A BOARD - CONDUCTOR SIDE
Step 5
Confirm that a voltage of more than
18.0 VDC
(KV-35S42/S66/V42)
or 21.5 VDC (KV-32S42/S66/V42)
appears between TP85 and ground at AC input:
120.0 ± 2.0 VAC
4-2. B+ VOLTAGE CONFIRMATION AND
ADJUSTMENT
Always perform the following adjustments when replacing the follow-
ing components marked with
on the schematic diagram:
G BOARD:
IC643, R661
1. Using a Variac, apply AC input voltage: 130 + 2.0 VAC
2. Input a monoscope signal.
3. Set the PICTURE control and the BRIGHT control to
initial reset value.
4. Confirm the voltage of G BOARD CN641 between
pin
1
to ground is less than 136.5 VDC.
5. If step 4 is not satisfied, replace the R661and repeat the
above steps.
A BOARD:
IC351, IC501, D519, D520, D521, C531,
C532, R387, R529, R530, R531, R532,
R533, R550, T503
G BOARD:
IC643, R661