Aiwa AM-HX100 Service Manual page 29

2. Adjustment Procedure
(1) How to activate adjustment mode
Turn ON the power (set 1.30V batteries terminal) while shorting TEST of the main circuit board. Once adjustment mode is activated, LCD
will all light up and EL backlight will be turned ON. Then it displays "Manufacture MODE".
(2) Using the multimeter, measure the DC voltage between VDD-GND of the test point.
Check that the voltage between VDD-GND is more than 2.3V.
If it has not reached 2.3V, short the VO ADJ. of the test point with the solder.
(3) EEPROM Initialization
Press the "DISPLAY" key. "EP INT OK" appears on the display.
Press "PLAY/STOP" key to display "IDLE".
(4) PIT disc (TEST DISC: TGYS1 or TDYS-1)
Press "F-SKIP" and "B-SKIP" keys to shift the pick-up towards the centre.
Insert the disc and press "PLAY/STOP" key. (Make sure the top panel is upward)
LCD of the remote controller will be displayed "AUTO ADJ H" first, then "COMPLETE".
Press "PLAY/STOP" key again to display "IDLE".
* If it displayed "Failed" during adjustment, it means that some abnormalities are detected and the operation is terminated.
(5) GRV disc (SONY MDW-74)
Insert the disc and press "PLAY" key. (Check the facing direction of the set)
LCD of the remote controller will be displayed "AUTO ADJ L" first, then "COMPLETE".
Press "PLAY/STOP" key again to display "IDLE".
* If it displayed "Failed" during adjustment, it means that some abnormalities are detected and the operation is terminated.
(6) Checking RF Level and Error Rate
TEST DISC: Insert TGYS1 or TDYS-1.
Press "—" key, display "032c 00e" and playback.
Make sure if the error rate is below "50e".
Check the RF waveform (TP3) with an oscilloscope and it is within the 1.0±0.2V p-p.
Press "PLAY/STOP" key to display "IDLE".
Press "+" key of the remote controller. Display "600c 00e" and playback.
Make sure if the error rate is below "60e".
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