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Adjustment - JVC DR-MH20SE Service Manual

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4.1
Timer clock adjustment (for only ver.E,ER)
If an error comes to arise for a clock, the following procedure will adjust.
Signal
(A1) No signal
Mode
(B)
Equipment
(C)
Measuring point
(D1)
(D2)
(D3)
Adjustment part
(F)
Specified value
(G1) 1024.008 ±0.001 Hz
(1) Connect the frequency counter to the measuring point (D1).
(2) Connect the short wire between the short point (D2) and Vcc (5V).
(3) Short the leads of capacitor (D3) once in order to reset the microprocessor of the system controller.
(4) Disconnect the short wire between the short point (D2) and Vcc then connect it again.
(5) Adjust the Adjustment part (F) so that the output frequency becomes the specified value (G).
SECTION 4

ADJUSTMENT

EE
Frequency counter
IC3001 pin 61
IC3001 pin 17
C3026 + and -
C3025 (TIMER CLOCK)
(976.5549 ±0.0010 usec)
(No.YD027)1-11

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