Sharp VC-H982U

40
VC-A582U
VC-A582U(A)
VC-H982U
FLOW CHART NO.6 TIMER(2) TROUBLESHOOTING
Does the key switch make good contact?
Check switch contact.
Is there a short in the scan outs or key inputs?
Check all the terminals of IC5001 and switches for poor soldering.
Are pulses received at pins(26) thru (29) of IC801 when the keys are activated?
Check lines of key in and scan out.
Check IC801, IC701 and FLP data, FLP clock, FLP CS and key data.
YES
YES
YES
NO
NO
NO
Key-in input is not received.
FLOW CHART NO.7 INFRARED R/C TROUBLESHOOTING
No operation is possible from the infrared remote control.
Does the infrared remote control function?
Replace infrared remote control as required.
Is the supply voltage of 5V feed to Vdd terminal of remote control receiver?
Check AT 5V and GND lines.
Is "L" pulse sent out Vout terminal of receiver when the infrared remote control is activated?
Replace receiver.
Check between at Vout terminal of receiver thru to pin(5) of IC701.
Replace IC701.
YES
NO
NO
NO
NO
NO
NO
FLOW CHART NO.8 CASSETTE CONTROL TROUBLESHOOTING(1)
A cassette tape is not take in.
Is the cassette housing distroted? Fix or replace the cassette housing.
YES
YES YES
YES YES
YES
YES
NO
NO
NO
NO
NO
Check start sensor cover.
Check start sensor and all the way up thru to pin (79) of IC701.
Check IC701 and all the way up thru to pin (2) of IC703.
Check IC703.
Check between IC703 and loading motor.
Replace loading motor.
Is the specified voltage applied at the loading motor terminal when the cassette tape is inserted?
Does pin (5) of IC703 change to about 10V when the cassette tape is inserted?
Does pin (2) of IC703 go to a "H" (about 1.7V)level when the cassette tape is inserted?
Does pin (79) of IC701 change from "H" to "L" level when the cassette tape is inserted? Are start sensor cover go to open when the cassette tape is inserted?
NO
NO NO
FLOW CHART NO.9 CASSETTE CONTROL TROUBLESHOOTING(2)
A cassette tape is taken in, but ejected at once.
Does the start sensor pulse at pin (79) of IC701 change from "L" to "H" level when the cassette tape is loaded?
Check start sensor and all the way up thru to IC701.
Does the end sensor pulse at pin(85) of IC701 change from "L" to "H" level when the cassette tape is loaded?
Check end sensor and all the way up thru to IC701.
Does the master cam mode shifter operate normally when the cassette tape is loaded?
Check cam switch and all the way up thru to IC701.
Replace IC701.
YES
YES YES