Technics SX-KN1600 - Page 19

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Diagnostic Part/Diagnostic Device Procedure of Service Mode
LCD test Turn on the power switch while holding down the two G keys shown
below.
a a
G3 G4
While the message “LCD PANEL TEST” is displayed on the LCD, the entire screen is repeatedly switched in the order of
white — black — “H” pattern.
*“H?” pattern is a big “H”. It is used to check for crosstalk.
CPR/CPL P.C.B.: 1.In case the LCD is defective, connect the CHECKING DEVICE to
1 chip Microcomputer (IC1) check CN4 on the MAIN P.C.B. (refer to page I-20).
2.Turn on the power switch while holding down the two D keys shown
below and the CHECKING DEVICE switch if connected.
S|
D3 D4
The results of the test will be displayed on the LCD with "PANEL CPU CHECKING" message.
In case the CHECKING DEVICE is connected, the LED of the CHECKING DEVICE flashes 4 times when the power swich
is turned on. The order of the LED flashes corresponds to the Microcomputer (IC) number on the respective P.C.B.s as
shown below. If an IC is defective, the corresponding flash time is longer.
Examples
1 2 3
1. CPR (IC1), CPL (IC1) OK —————— e@ (@) (@)
2. CPR (IC1) defective, CPL (IC1)OK §= ——¥W¥—W\—> = (@) (@)
ie ee
CPR CPL
a ; (IC1) (IC1)
NOTE : @ indicates short flash time
™= indicates long flash time Unassigned
CPR/CPL P.C.B.:: Turn on the power switch while holding down the two F keys shown
Control Panel switch and LED check below.
F4
a
F3
First, all of the LEDs on the Control Panel will light up simultaneously. Check that they do. Then, press the buttons on the
Control Panel and confirm that the corresponding LED lights. For buttons without LEDs, the 4 BEAT display LEDs by the
START/STOP buiton will light up simultaneously. :
¢ To light up all of the LEDs on the Control Panel, press DEMO button.