Syscon Circuit [Hm-Hds1Eu]; Timer Clock - JVC HM-HDS1EK Service Manual

3.6 SYSCON CIRCUIT [HM-HDS1EU]

Note:
• When perform this adjustment, remove the Mechanism
assembly.

3.6.1 Timer clock

Signal (A) • No signal
Mode (B) • EE
Equipment (C) • Frequency counter
Measuring point (D1) • IC3001 pin 61
Short point (D2) • IC3001 pin 24
(D3) • C3026 + and –
Adjustment part (F) • C3025 (TIMER CLOCK)
Specified value (G) • 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 fre-
quency becomes the specified value (G).
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