Sanyo DS13310 Service Manual

Also see for DS13310, DS19310: Owner's manual

Contents

Sanyo DS13310 Service Manual Manual pdf 8 page image

HIGH VOLTAGE CHECKNote: +B (+135V) Voltage Check and Grayscale Adjustmentmust be completed before attempting High Voltage Check.1. Connect high voltage voltmeter negative lead to ground, andconnect + lead to anode of picture tube.2. Tune receiver to an active channel and confirm TV isoperating properly.3. Eliminate the beam current by adjusting the contrast andbrightness controls to minimum.4. Confirm high voltage is within 20.0 KV and 22.0 KV. If readingis not within range, check horizontal circuit.No high-voltage adjustment is provided on this chassis.HIGH VOLTAGE HOLD-DOWN TESTEvery time the receiver is serviced, the HIGH VOLTAGEHOLD-DOWN circuit must be tested for proper operation byfollowing these steps:1. Connect receiver to 120V AC line. Tune receiver to activechannel. Set the picture controls to the Auto levels.2. Check that the voltage measured between TP7 and TE7(ground side) is within 15.6 VDC to 19.2 VDC. If the voltageis out of this range, the Hold-Down Circuit must be checked.3. Connect a DC Voltage supply to TP7 and TE7 through a 100ohm 1/4W resistor. Adjust the DC voltage to 23 VDC. Thereceiver should shutdown, losing raster and sound. Then thereceiver should turn off automatically. This reaction indicatesthat the Hold-Down circuit is functioning properly. If thereceiver does not shutdown, a malfunction is indicated andits cause must be found and corrected.4. To obtain picture again, remove the DC Supply and wait afew minutes. Now turn on the receiver.— 8 —SERVICE ADJUSTMENTS (Continued)VIDEO INPUT LEVEL ADJUSTMENTNote: Video Input Level adjustment affects brightness level.When Video Input Level adjustment is made, brightnesslevel must be checked.1. Connect video signal generator output (1 Vp-p terminated at75 ohms) to VIDEO INPUT JACK.2. Set TV to Game Mode.3. Connect scope to TP16A and ground.4. Adjust Video Input Level (VR1023) for 2.0 ± 0.2 VDC.5. Set TV to TV Mode, Picture Controls to Auto levels.Check brightness and contrast on several active channels. Ifbrightness or contrast is incorrect, reset bright level.SOUND ADJUSTMENT1. Connect Voltmeter – lead to ground and + lead TP 20 (FMDET OUT) on main board.2. Tune receiver to an active channel and fine tune to obtain thebest picture.3. Confirm D.V.M. reading of 3.85 ± 0.2 VDC.4. If the voltage is out of this range, adjust Sound I.F. Transformer(T131) for 3.85 ± 0.2 VDC.