TROUBLESHOOTING GUIDE
PUSH THE POWER SUPPLY
IS THE AMBER LED AMBER
YES
NO
CAN PRESSING ANY KEY MAKE
OK
IS IT RED?
NO
YES
CHECK THE PROTECT CIRUIT
NO
CHECK THE 5V SUPPLY CIRCUIT
(ON POWER BOARD)
YES
CHECK THE AMBER LED CONTROL
IS IT GREEN?
CIRCUIT(Q72,Q73,Q74,LED717)
NO
NO
IS THE STANDBY SINGAL LOW
LEVEL?
CHECK THE STANDBY CONTROL
CIRCUIT
IS THE ABMER LED GREEN?
YES
NO
CHECK THE KEYS CONNECTION
SOME KEYS IS USELESS?
IS THE IR IN/OUT NORMAL?
YES
NO
IS THE 18V SUPPLY NORMAL?
CHECK THE 18V SUPPLY
IS THE SPK OUT NORMAL?
YES
NO
NO
CHECK THE SERVO CIRCUIT
IS THE POWER AMP INPUT
YES
NO
CHECK THE POWER AMP CIRCUIT
SECTION
IS THE MUTE SIGNAL OFF?
YES
CHECK THE MUTE CONTROL
CIRCUIT
NO
NO
YES
CHECK THE MODULES CIRCUIT
IS THE VOLUME CONTROL CIRCUIT
NORMAL?
CHECK THE VOLUME CONTROL
CIRCUIT
IS THE 12V SUPPLY NORMAL?
YES
THE UNIT WORK NORMALLY?
YES
NO
YES
NO
YES
NO
YES
NO
LIGHT?
YES
YES
CHECK 12V SUPPLY
CHECK THE LED CONTROL
CIRCUIT(Q72,Q73,Q74,LED717)
AND PROTECET CIRCUIT
CHECK MCU AND RELAY
CONTROL CIRCUIT
IS THE OUTPUT DC LEVEL
NORMAL?
ARE ALL POWER SUPPLIES OK?
CHECK THE POWER SUPPLIES
CIRCUIT
YES
NO
YES
IS THERE SIGNAL OUTPUT?
NORMAL?
ARE THE TWO MODULES NORMAL?
CHECK THE TONE CIRCUIT
YES
NO
IS THE THD HIGH?
YES
IS THE IDLE CURRENT NORMAL?
IS THE S/N RATE BAD?
TURN THE TRANSFORMER
ADJUST THE IDLE CURRENT OR
CHECK THE IDLE CURRENT
CIRCUIT
NO
CHECK THE POWER AMP CIRCUIT
(IF SOME TRANSISTORS ARE
DEFEATED)
IS THE REMOTE CONTROL OK?
CONNECTION OR CIRCUIT(PARTS)
NORMAL?
ANOTHER REMOTE CONTROL
NO
NO
YES
YES
CHECK THE IR CONTROL CIRCUIT
(INCLUDE THE IR RECEIVER AND
GROUND?
YES
NO
NO
YES
YES
CHECK THE IR IN/OUT
REPLACE THE BTTERIES OR
HANDSET
MCU)
CHECK THE CONNECTION
AND CHECK IF THE RELATIONAL
TRANSISTORS ARE DEFEATED
DID THE 12V SUPPLY SHORT
IS THE REMOTE HANDSET ITSELF
SWITCH TO ON
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