Syscon Circuit - JVC HR-J271MS Service Manual

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3.4

SYSCON CIRCUIT

Note:
• When perform this adjustment, remove the Mechanism
assembly.
3.4.1 Timer clock
Signal
Mode
Equipment
Measuring point (D1)
Measuring point (D1)
Short point
Adjustment part (F)
Specified value
[HR-J271MS/J471MS]
(1) Connect the frequency counter to the measuring point
(D1).
(2) Connect the short wire between the short point (D2) and
GND.
(3) Short the leads of capacitor (D3) once in order to reset
the microprocessor of the SYSCON.
(4) Adjust the Adjustment part (F) so that the output fre-
quency becomes the specified value (G).
[HR-J677MS/J777MS]
(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).
(A) • No signal
(B) • EE
(C) • Frequency counter
[HR-J271MS/J471MS]
• IC3001 pin 29
(D2) • IC3001 pin 57
(D3) • C3015 + and –
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
[HR-J677MS/J777MS]
• IC3001 pin 61
(D2) • IC3001 pin 24
(D3) • C3026 + and –
[HR-J271MS/J471MS]
• C3018 (TIMER CLOCK)
[HR-J677MS/J777MS]
• C3025 (TIMER CLOCK)
• 1024.008 ± 0.001 Hz
(G)
(976.5549 ± 0.0010 µsec)
Digitized in Heiloo Netherland
4/5/2017
3-3