Inverter High Voltage Check; Voltage Check; Frequency Check; Osd Dot Clock Check - Sony XVM-F65WL Service Manual

5-6. INVERTER HIGH VOLTAGE CHECK

Condition: DIMMER switch OFF

5-6-1. Voltage Check

Checking Method:
1) Connect oscilloscope between TP809 (+) and TP804 (–) using
high voltage proof probes (100:1).
2) Verify that the reading on the oscilloscope is at 2.4 ± 0.15 Vpp.
Checking location: Monitor board

5-6-2. Frequency Check

Checking Method:
1) Connect oscilloscope between TP809 (+) and TP804 (–) using
high voltage proof probes.
2) Verify that the reading on the oscilloscope is at 50 ± 2.5 kHz.
Checking location: Monitor board

5-7. OSD DOT CLOCK CHECK

1. Dot Clock Check
Checking Method:
1) Connect frequency counter between TP555 (+) and TP554 (–).
2) Verify that the reading on the counter is at 6.5 ± 0.2 MHz.
Checking location: Monitor board

5-8. NTSC SUBCARRIER CHECK.

1. Subcarrier Check
Checking Method:
1) Press the [INPUT] key on the remote controller and enter the
R
NTSC mode using the
2) Connect frequency counter between TP503 (+) and TP504 (–).
3) Verify that the reading on the counter is at 3.579545 MHz ± 100
Hz.
Checking location: Monitor board

5-9. PAL SUBCARRIER CHECK

1. Subcarrier Check
Checking Method:
1) Press the [INPUT] key on the remote controller and enter the
PAL mode using the R and
2) Connect frequency counter between TP503 (+) and TP504 (–).
3) Verify that the reading on the counter is at 4.433619 MHz ± 100
Hz.
Checking location: Monitor board
r
and keys.
r keys.

5-10. F0 FREQUENCY ADJUSTMENT

5-10-1. 3.2/3.8MHz (CH2) Adjustment

Adjustment Method:
LCH (3.2 MHz)
1) TP356 is connected to GND.
2) Connect frequency counter between TP354 (+) and TP353 (–).
3) Adjust RV352 so that the reading on the counter stands at the
specified value.
Specified value: 3.2 MHz ± 3 kHz
RCH (3.8 MHz)
4) Connect frequency counter between TP352 (+) and TP353 (–).
5) Adjust RV351 so that the reading on the counter stands at the
specified value.
Specified value: 3.8 MHz ± 3 kHz
Adjustment location: Monitor board

5-10-2. 2.3/2.8MHz (CH1) Check

Checking Method:
LCH (2.3MHz)
1) TP365 is made open.
2) Connect frequency counter between TP354 (+) and TP353 (–).
3) Verify that the reading on the counter is at 2.3 MHz ± 30 kHz.
RCH (2.8MHz)
4) Connect frequency counter between TP352 (+) and TP353 (–).
5) Verify that the reading on the counter is at 2.8 MHz ± 30 kHz.
Checking location: Monitor board
5-11. V COM VOLTAGE/POSITION ADJUSTMENT
Condition: TEST MODE (See 11 page)
1. Voltage Setup Adjustment
Adjustment method:
1) Select Com Gain from the FOR FACTORY MODE.
2) Connect oscilloscope between TP724 (+) and TP710 (–).
3) Adjust so that the p-p value A of the waveform stands at the
specified value using the R
4) Adjust so that the level B on the negative side stands at the
specified value using RV652.
5) Verify that the level C on the positive side stands at the specified
value.
Specified value A: 6.8 ± 0.1 Vp-p
Specified value B: –2.1 ± 0.1 V
Specified value C: 4.7 ± 0.1 V
0V
Adjusting location: Monitor board
XVM-F65WL
and r keys on the remote controller.
C
A
B
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