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10
XVM-B62
5-4. DC-DC CONVERTER ADJUSTMENT
5-4-1. Frequency Adjustment
Adjustment Method:
1) Connect frequency counter between TP702 (+) and TP704 (–).
2) Adjust RV702 so that the reading on the counter stands at the
Adjustment Method:
1) Connect frequency counter between TP702 (+) and TP704 (–).
2) Adjust RV702 so that the reading on the counter stands at the
specified value.
Specified value: 243
± 3 kHz
Adjustment location: Main board
5-4-2. 5V Voltage Adjustment
Adjustment Method:
1) Connect digital voltmeter between TP707 (+) and TP710 (–).
2) Adjust RV701 so that the reading on the voltmeter stands at the
Adjustment Method:
1) Connect digital voltmeter between TP707 (+) and TP710 (–).
2) Adjust RV701 so that the reading on the voltmeter stands at the
specified value.
Specified value: 5.05
± 0.03 V
Adjustment location: Main board
5-4-3. Other Voltage Checks
Checking Method:
1) Connect digital voltmeter between TP708 (+) (Vdd) and
Checking Method:
1) Connect digital voltmeter between TP708 (+) (Vdd) and
TP710 (–).
2) Verify that the reading on the voltmeter is at 3.20
± 0.2 V.
3) Connect digital voltmeter between TP706 (+) (Vgh) and
TP710 (–).
4) Verify that the reading on the voltmeter is at 7.3
± 0.3 V.
5) Connect digital voltmeter between TP705 (+) (Vgh) and
TP710 (–).
6) Verify that the reading on the voltmeter is at 17.0
± 1.5 V.
7) Connect digital voltmeter between TP709 (+) (Vss) and
TP710 (–).
8) Verify that the reading on the voltmeter is at –12.0
± 1.5 V.
Checking location: Main board
5-5. PLL ADJUSTMENT
5-5-1. Frequency Adjustment
Adjustment Method:
1) Connect digital voltmeter between TP807 (+) and TP808 (–).
2) Adjust RV802 so that the reading on the counter stands at the
Adjustment Method:
1) Connect digital voltmeter between TP807 (+) and TP808 (–).
2) Adjust RV802 so that the reading on the counter stands at the
specified value.
Specified value: –2.2
± 0.15 V
Adjustment location: Main board
5-6. INVERTER HIGH VOLTAGE CHECK
Condition: DIMMER switch OFF
5-6-1. Voltage Check
Checking Method:
1) Connect oscilloscope between TP606 (+) and TP605 (–).
2) Verify that the reading on the oscilloscope is at 2.4
Checking Method:
1) Connect oscilloscope between TP606 (+) and TP605 (–).
2) Verify that the reading on the oscilloscope is at 2.4
± 0.15 Vp-p.
Checking location: Main board
5-6-2. Frequency Check
Checking Method:
1) Connect oscilloscope between TP606 (+) and TP605 (–) using
Checking Method:
1) Connect oscilloscope between TP606 (+) and TP605 (–) using
high voltage proof probes.
2) Verify that the reading on the oscilloscope is at 49
± 2.5 kHz.
Checking location: Main board
5-7. OSD DOT CLOCK CHECK
1. Dot Clock Check
Checking Method:
1) Connect frequency counter between TP565 (+) and TP564 (–).
2) Verify that the reading on the counter is at 6.5
Checking Method:
1) Connect frequency counter between TP565 (+) and TP564 (–).
2) Verify that the reading on the counter is at 6.5
± 0.2 MHz.
Checking location: Main board
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