Wednesday, February 20, 2013

SANYO CP21YS2 - SERVICE ADJUSTMENTS - SERVICE MODE - SPECIAL SETTINGS




ADJUSTMENTS AFTER MEMORY IC REPLACEMENT
  The CPU (IC201) and memory IC (IC801) store the service adjustments data and controls data for each circuit. When the Memory IC(IC801) is replaced, some of the service adjustments should be readjusted to obtain the best performance.
Initializing Procedure
  • Put a new memory IC.
  • Turn on the TV set.
  • Press and hold the TV/AV Selector on the TV set for more than 2 seconds.
  • Press the PROGRAMME UP on the TV set while the above On-Screen Display is still on the screen. Picture [CLR] appears on the screen.
  • Switch off the TV set by pressing the Power Switch button on the TV set while the above On-Screen Display is still on the screen. This completes the initialization of memory IC.
Following shows the initialized contents of memory data by this procedure.
  1. Plug & play : No executed
  2. Inhibit data : Cancelled
  3. Ch skip data : Cancelled
  4. Sound volume data : 10/63 steps.
  5. Volume Lock : OFF
  6. Colour system : AUTO
Required Service Adjustments.  Readjust the following service adjustments.
Adjustments Service Mode No. & Item
  • RF AGC Item 01, RF AGC
  • Horizontal centre Item 02, H-PHA
  • Vertical Position Item 04, V-SHIFT
  • Vertical linearity Item 06, V-LIN
  • Vertical-S correction Item 07, V-SCO
  • Gray scale Item 30-33, 35-37
ENTERING INTO SERVICE MODE
  • Press and hold the MENU button on the Remote Control and press the VOLUME (+) button on the TV set.
  • Select item by pressing the TIMER (Item No. UP) or SOUND MUTE (Item No. DOWN) button on the remote control handset.
  • Adjust data value by pressing the VOLUME + or VOLUME - button on the remote control handset.
  • To return to normal TV mode, press the MENU button on the TV set or the remote control handset
GRAY SCALE ADJUSTMENT
  1. Receive a monochrome circular pattern.
  2. Set the brightness and colour to normal, contrast to maximum.
  3. Enter to the service mode.
  4. Select No. 30 RBIAS (Red Bias), No, 31 GBIAS (Green Bias), and No. 32 BBIAS (Blue Bias) and set each data to 0 by pressing the VOLUME + or - key.
  5. Select No. 33 RDRIV (Red Drive) and No. 35 BDRIV (Blue Drive) and set each data to 64 by pressing the VOLUME + or - key.
  6. Turn Screen Control on the FBT (T471) to minimum (fully counter-clock-wise).
  7. Select No. 36 (1-horizontal line will appear across the center).
  8. Advance Screen Control clockwise to obtain just visible one colour line. If line does not appear, place this control to maximum (fully clockwise).
  9. Raise each Bias Level with 1, 2, 5, 6, 9 and 0 keys to obtain just visible white line.
  10. Select No. 37 DRV (Drive Adjustments).
  11. Adjust Red and Blue Drive Levels alternately with 3, 4, -/-- or RECALL key to produce normal black and white picture in highlight areas.
  12. Check for proper grayscale at all brightness levels. To turn off the TV Service Menu display, press the MENU key.
  13. If the Grayscale adjustment is made after picture tube replacement, check the High Voltage.
RF-AGC ADJUSTMENT.  NOTE: Do not attempt this adjustment with weak signal.
  • Tune the receiver to most clearest (or strongest) VHF station in your area. Set the brightness and contrast controls to maximum. Set the color control to minimum.
  • Select [RF AGC] in the service mode.
  • Change value until the snow noise just disappears.
  • Exit from service mode.
B-VOLTAGE SUPPLY CHECK
  • Connect DC meter to TP-B and the ground.
  • Tune the receiver to an active channel and synchronized picture. Select NATURAL picture mode by pressing the PICTURE MODE button on the remote control.
  • Adjust B-voltage to be 140 ± 0.5V DC by using VR631.
HIGH VOLTAGE CHECK
Note: +B (+140V) Voltage Check and Grayscale Adjustment must be completed before attempting High Voltage Check.
  • Connect high voltage voltmeter negative lead to ground, and connect + lead to anode of picture tube.
  • Tune receiver to an active channel and confirm TV is operating properly.
  • Maximize the beam current by adjusting the contrast and brightness controls to maximum. Confirm high voltage is within 22.0 KV and 24.0 KV at maximum beam current.
  • Eliminate the beam current by adjusting the contrast and brightness controls to minimum. Confirm high voltage does not exceed 25.0 KV at zero beam current.
  • If reading is not within range, check horizontal circuit. No high-voltage adjustment is provided on this chassis.
SPECIAL FUNCTIONS
  • Music Mode setting
When Music Mode is ON, Programme position from “247” to “255” and “0” are set Music Mode. Only sound is provided and any picture is not on the screen under Music Mode.
  • Tuning Lock setting
Once TUNING LOCK is switched on, further channel tuning (Pre-set) is not possible. The Channel Swapping function also is not possible.
  • Volume Lock setting

With this function, a maximum sound volume limit can be set at any level.
  • AV Start setting
Set AV-START to ON and every time the TV set is switched on, AV1 position will be the initial programme position.
How to set the special function
  • When making the VOLUME LOCK setting, set the desired maximum sound volume by pressing the VOLUME + or - button before entering Special Function setting mode.
  • To enter into the special function setting mode, press and hold the MENU button of the remote control, then press the PROGRAMME DOWN button on the TV set.
  • Select an item of the special functions by pressing the PROGRAMME UP or DOWN button on the remote control or the TV set.
  • Set the selected special function “ ON “ by pressing the VOLUME + or - button. To cancel, set to “ OFF”.
  • Press the MENU button of the remote control to return to the normal TV mode.

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