Sharp VE-CG30U Service Manual page 16

VE-CG30U
VE-CG40U
5-2-1. Power circuit adjustment
Conditions
Mode dial setting:
Measuring instrument:
Adjustment jig:
5-2-1-1. Power line voltage check
Power line name
1.APCON 5V
2.APCON 3.3V
3.DPCON 3.3V
4.DPCON 1.8V
5.LCD 12V
6.CAM 15V
7.CAM -7.0V
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.
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
Measuring point: TL1819
TL1818 (GND)
Adjustment specification: 1.66V±0.1V
5-2-2-2. R-W/B ADJ
Address: 0501
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)
Adjustment specification: 0V±0.05V
5-2-2-3. B-W/B ADJ
Address: 0502
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)
Adjustment specification: 0V±0.05V
AUTO
Digital voltmeter
Dummy load is connected to
each TL.
Measuring point (TL) Measured value
TL3901 5.0±0.1V
TL4901 3.3±0.1V
TL4902 3.3±0.1V
TL6901 1.8±0.1V
TP5903 12.0±0.4V
TL5901 15.0±0.5V
TL5902 -7.0±0.35V
(1) Connect the digital voltmeter to TL1819.
(2) Select the address 0518 and set the address. (No signal on the LCD Display)
(3) Set the data of the DC voltage to a specified value using
(1) Connect the oscilloscope to TL1837 (G-OUT)/TL1838 (R-OUT).
and TL1838 (R-OUT) using
(1) Connect the oscilloscope to TL1837 (G-OUT)/TL1836 (B-OUT).
and TL1838 (R-OUT) using
Line name TL
LCD 12.0V TL5904
CAM 15.0V TL1
CAM -7.0V TL3
Long : (-)
Short : (+)
BATT.IN Check jig (QTANZA006WJZZ)
or key.
or key.
16
Current Resistance
8.6mA 1.4KΩ
10.0mA 1.4KΩ
8.0mA 0.8KΩ
or key.
‚ f
‚f B
‚ q