Service manual

16
VE-CG30U
VE-CG40U
5-2-1. Power circuit adjustment
Conditions
Mode dial setting: AUTO
Measuring instrument: Digital voltmeter
Adjustment jig: Dummy load is connected to
each TL.
5-2-1-1. Power line voltage check
5-2-1-2. Temperature detection function check
Connect a resistor of 680Ω between TL770 and GND and check that the power is turned off.
5-2-1-3. Battery shutoff voltage adjustment
1) Connect the BTT.IN Check jig (QTANZA006WJZZ) to the main PWB P2902.
2) Apply 3.90± 0.03V between the positive (+) and negative (-) electrodes of the BATT.IN Check jig (QTANZA006WJZZ).
3) According to the procedure of 5-1, set <TEST D> and press the SET key to adjust the voltage.
Line name TL Current Resistance
LCD 12.0V TL5904 8.6mA 1.4KΩ
CAM 15.0V TL1 10.0mA 1.4KΩ
CAM -7.0V TL3 8.0mA 0.8KΩ
BATT.IN Check jig (QTANZA006WJZZ)
5-2-2. LCD circuit adjustment
Conditions
Mode: Set <TEST 0> according to the procedure of 5-1 and select the ADDRESS value which is specified in the
following adjustment items. Set E2PROM data to the value specified in the adjustment procedure. See 5-1-1.
Measuring instrument: Digital voltmeter, oscilloscope
5-2-2-1. VCO adjustment
Address: 0518 (1) Connect the digital voltmeter to TL1819.
Measuring point: TL1819 (2) Select the address 0518 and set the address. (No signal on the LCD Display)
TL1818 (GND) (3) Set the data of the DC voltage to a specified value using or key.
Adjustment specification: 1.66V±0.1V
5-2-2-2. R-W/B ADJ
Address: 0501 (1) Connect the oscilloscope to TL1837 (G-OUT)/TL1838 (R-OUT).
Measuring point: TL1837 (G-OUT) (2) Select the address 0501 and set the address. (No signal on LCD Display)
TL1838 (R-OUT) (3) Adjust the difference between peak-to-peak values of TL1837 (G-OUT)
TL1832 (GND) and TL1838 (R-OUT) using or key.
Adjustment specification: 0V±0.05V
5-2-2-3. B-W/B ADJ
Address: 0502 (1) Connect the oscilloscope to TL1837 (G-OUT)/TL1836 (B-OUT).
Measuring point: TL1837 (G-OUT) (2) Select the address 0502 and set the address. (No signal on LCD Display)
TL1836 (B-OUT) (3) Adjust the difference between peak-to-peak values of TL1837 (G-OUT)
TL1832 (GND) and TL1838 (R-OUT) using or key.
Adjustment specification: 0V±0.05V
ＧＲ
Ｇ
B
Power line name Measuring point (TL) Measured value
1.APCON 5V TL3901 5.0±0.1V
2.APCON 3.3V TL4901 3.3±0.1V
3.DPCON 3.3V TL4902 3.3±0.1V
4.DPCON 1.8V TL6901 1.8±0.1V
5.LCD 12V TP5903 12.0±0.4V
6.CAM 15V TL5901 15.0±0.5V
7.CAM -7.0V TL5902 -7.0±0.35V
Long : (-)
Short : (+)