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6 SERVICE HINT
Malfunction content: Not oscillated.
Symptom: 1. Not oscillated when the power switch is ON.
2. Oscillated when shorting both terminal of CUT1, charging voltage is up to 150 - 250 V and then shorting.
3. Normal charging is performed by shorting CUT1 but flash repeatedly comes to above symptom.
4. Also comes to above symptom after flashed properly.
Cause: T1 is rare shorting and disconnection of CUT1.
Service point: Replace T1 and CUT1.
Remarks: The bond which is fixed to CUT1 is lost color to brown, it may be heated Q1 and Q2. Replace Q1 and Q2 commonly.
After replacing CUT1, Q1 and Q2, bond these parts and fixed.
Malfunction content: Not oscillated.
Symptom: 1. Not oscillated when the power switch is ON.
2. When shorting both terminal of CUT1, oscillation is performed normally. (Also flash is normal)
Cause: Disconnection of CUT1.
Service point:
Replace CUT1.
Remarks: The bond which is fixed to CUT1 is lost color to brown, it may be heated Q1 and Q2. Replace Q1 and Q2 commonly.
Not lost color to brown is only malfunction of CUT1. No replacement of Q1 and Q2 is required. After replacing CUT1,
Q1 and Q2, bond these parts and fixed.
Malfunction content:
Not flashed.
Symptom:
1. Normal oscillation and charging is performed when the power switch is ON.
2. Not flashed. (test flash button, shoe, sync cord and SLAVE mode)
3. Output voltage of X terminal is normal. (Approx. 5 V is output at (+) terminal of C17.)
4. The voltage of SCR2 anode terminal is less than 280 V. (Almost the voltage is 0 - 230 V.)
Cause: C15 is shorted. (It can be confirmed by tester.)
Service point: Replace C15.
When C.B.A. (A) is removed from main case (D), charging is performed by shorting between 2 points shown below.
Malfunction content: Not flashed.
Symptom: 1. Normal oscillation and charging is performed when the power switch is ON.
2. Not flashed. (test flash button, shoe and sync cord) Lighted. (SLAVE mode) In this case, it cause the sync circuit is
malfunction. Trigger and flash circuit is not malfunction.
3. Output voltage of X terminal is abnormal. (Approx. 5 V is not output at (+) terminal of C17.)
Cause: RQ4 is shorting.
Service point: Replace QR4.
Malfunction content: Oscillated when the power switch is changed to OFF.
Symptom: 1. Oscillation and charging is performed when supply the power at the condition the power switch is OFF. But pilot
lamp is not lighted and flashed.
2. When the power switch is ON after above symptom, normal operation for oscillation, charging, lighting and flashing
is performed.
3. When the power switch is OFF after symptom 2, it occurred symptom 1.
Cause: Q3 is shorting.
Service point: Replace Q3.
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DMW-FL28PP / DMW-FL28E