DEH-P780MP/XN/UC
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6.4 SYSTEM MICROCOMPUTER TEST PROGRAM
6.5 HOW TO CHECK THE REVOLUTION NUMBER DETECTION CIRCUIT
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PCL Output
In the normal operation mode (with the detachable panel installed, the ACC switched ON, the standby mode
cancelled), shift the TESTIN IC601(Pin 126) terminal to H.
The clock signal is output from the PCL terminal IC601(Pin 62).
The frequency of the clock signal is 625.000 kHz that is one 32th of the fundamental frequency.
The clock signal should be 625.000 kHz(- 25 Hz, + 25 Hz).
If the clock signal is out of the range, the X’tal (X601) should be replaced with new one.
Acc
BU
DC Regulated
Power Supply
Audio Oscillator
+
4.7
µ
F/16 V
+12 V
GND
-
Connection Diagram
Checking the Revolution Number Detection Circuit
1. Input 400 mVp-p sine waves and confirm change of output voltage according to frequency.
Frequency at 4 000 rpm can be set by user operation.
Linear complement between 0 rpm = 0 Hz and 4 000 rpm.
To microcomputer
F/V IC
HPF
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