JVC HRDVS3KR
Instrukcja Serwisowa

SECTION 3 ELECTRICAL ADJUSTMENT (VHS)
3.1 Syscon circuit Note: � When perform this adjustment, remove the Mechanism assembly. 3.1.1 Timer clock
Signal Mode Equipment (A) (B) (C)

Measuring point (D1) Short point (D2) (D3) Adjustment part (F) Specified value (G)

� No signal � EE � Frequency counter � IC3001 pin 61 � IC3001 pin 24 � C3026 + and � � C3025 (TIMER CLOCK) � 1024.008 ± 0.001 Hz
(976.5549 ± 0.0010 µsec)

(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 SYSCON. (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).

3-1