. Various PF2939+CH-16 free download

File name PF2939+CH-16.pdf

SERVICE MANUAL 3.1 Connect a precise static high voltmeter to the second anode (inside the high voltage cap) of the CRT. 3.2 Plug in the supply socket (150-250V ~, 50Hz) and turn on the TV. Set the brightness and contrast to minimum (0 A). 3.3 The high voltage reading should be less than the limited EHT voltage. 3.4 Change the brightness from minimum to maximum, and ensure high voltage not beyond the limitation in any case. Nominal EHT voltage: 28.8KV 1KV Limited EHT voltage: 32KV 4. Focus Adjustment Caution: Dangerously high voltages are present inside the TV. Extreme caution should be exercised when working on the TV with the back removed. 4.1 After removing the back cover, look for the FBT on the main PCB. There should be a FCB on the FBT. 4.2 Power on the TV and preheat it for 15 min. 4.3 Receive a normal TV signal. Rotate knob of the FCB until you get a sharp picture. Before Adjusting After Adjusting Fig. 4 5. Safety Inspection 5.1 Inspection for insulation and voltage-resistant Perform safety test for all naked metal of the TV. Supply high voltage of 3000V, 50Hz (limit current of 10mA) between all naked metal and cold ground. Test every point for 3 sec. and ensure no arcing and sparking. 5.2 Requirements for insulation resistance Measure resistance between naked metal of the TV and feed end of the power cord to be infinity with a DC-500 high resistance meter and insulation resistance between the naked metal and degaussing coil to be over 20M . 6. SERVICE mode 6.1 To enter the SERVICE mode Set the volume to 0 by the remote control. Then press and hold the MUTE button on the remote control and MENU button on the TV at the same time for over 2 seconds. In the S mode, press the POWER button to quit the S mode. S ( S is red and other items are yellow.) 9 SERVICE MANUAL Use the / buttons on the remote control to highlight an adjustment and the / buttons to adjust it. The POS+/-, / / / ,1~6, RECALL, VOL+/-, MUTE and POWER buttons on the remote control function in the S mode, but 100+, 7, 8, 9 and 0 buttons not. 6.2 Bus data Table 3 Bus data Data in S Adjustment Description Mode OP1 7B Option set byte 1 See Table 4 OP2 48 Option set byte 2 See Table 4 OP3 FF Option set byte 3 See Table 4 OP4 F5 Option set byte 4 See Table 4 OP5 36 Option set byte 5 See Table 4 OP6 2