10. TROUBLESHOOTING
FLOW CHART NO.1
The power cannot be turned on.
Is the fuse normal?
Refer to the flow chart No.3 power trouble-shooting.
No
No
Is normal state restored when the power cord is
once withdrawn and then inserted again after
several seconds?
Replace the fuse.
Yes
Yes
No
Is the AT 5V line voltage normal?
Is there leaking or short-circuited primary side
component? (Q9007, Q9010, D9016, T9001,
D9012-3, C9021-2, etc.)
Yes
Is the voltage of AT 12V, AT -30V and filament
normal?
No
Check each rectifying circuit of secondary circuit.
FLOW CHART NO.2
FLOW CHART NO.3
The fuse blows out.
Is there leaking or short-circuited primary side
component?
FLOW CHART NO.4
When the output voltage fluctuates.
No
Does the secondary side photocoupler circuit
operate normally?
Check the circuit and replace the parts.
(D9020,D9014,D9009-11,Q9006,Q9009,etc.)
Yes
No
Does the primary side photocoupler circuit
operate normally?
Check the circuit and replace the parts.
(D9020,R9030,D9021-3,etc.)
FLOW CHART NO.5
When buzz is heard from the vicinity of power circuit.
Check for short-circuiting of rectifying diode and circuit in each rectifying circuit of secondary side.
(D9005-8,D9025,IC9001-3,Q9001,Q9005,etc.)
No
The power cannot be turned on.
Is P-CON(H) of IC504 pin 116 changed from 'L'
level to 'H' level?
No
Is the Q9005 base changed from 'L' level to 'H'
level?
Replace IC504.
Yes
Yes
No
Is the AUDIO 9V SW. circuit turned on?
Check the line from the IC504 pin 116 to the Q9005
base.
Refer to the flow chart No.9.
No
Check for short-circuiting of rectifying diode and
circuit in each rectifying circuit of secondary side.
Yes
Replace D9020.
FLOW CHART NO.6
The fluorescent display tube does not light.
No
Is 5V voltage supplied to the IC5001 pin 18? Check the AT 5V line.
Yes
No
Is -30V voltage supplied to the IC5001 pin 16?
Check the AT -30V line.
Yes
No
Is 4.0 MHz oscillation signal confirmed on the
IC5001 pins 19 and 20?
Check FL5001, IC5001 and their periphery.
Yes
No
Check the signal lines of FIP DA, FIP CK, FIP CS
of IC5001 and IC504.
Check or replace IC5001 and IC504.
FLOW CHART NO.7
The key operation is disabled.
No
Is key switch contact and installation state normal?
Replace Key switch.
Yes
Is the control voltage input normally into the pins
95 and 96 of IC504?
No
Check the power circuit and D5001.
No
Check for damages such as crack on the
fluorescent display tube.
Yes
Is the filament voltage supplied to both ends of
pins 1, 2 and 61, 62 of fluorescent display tube?
Yes
Check the fluorescent display tube and its periphery.
FLOW CHART NO.8
Shuttle ring doesn't function.
No
Is there a wrong point in the ring installation
condition of shuttle switch and the switch itself?
It meets a symptom, it copes, or, part exchange.
Yes
Is the control signal of 63 of IC504, 26 pin being
inputted normally? (63pin→J1,26pin→J2)
Shuttle ring rotation direction Shuttle control signal
Output wave shape
Clockwise direction J2~GND
J1~GND
Counterclockwise
direction
J2~GND
J1~GND
OFF
ON
OFF
ON
OFF
ON
OFF
ON
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