Turbo Air TMW-1100E Service Manual page 36

PRINTED CIRCUIT BOARD
1. CIRCUIT CHECK PROCEDURE
1. Low voltage transformer check
The low voltage transformer is located on the P.C.B.
Measuring condition: Input voltage: 120V / Frequency: 60Hz
Terminal Voltage
6-8
9-10
NOTE
1. Refer to Ciruit Diagram (point 4).
2. Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source
voltage.
3. The allowable tolerance of the secondary voltage is within ± 5% of nominal voltage.
2. Voltage Check
NO CHECK POINT
1 IC1 PIN 63, 64
2 IC1 PIN 38
3 IC1 PIN 33 OR 34
- Key check point
NO MEASURE POINT
1 MP1
2 MP2
- Check method
NOTE
Each measure point must be measured with GND points.
LOAD
DC 12V
AC 3.4V
5VDC
5V
0V
5V
0V
WAVE FORM
DC 5V±0.25V Replace Q8, ZD3, EC2
DC 12V±2.0V Replace D12, 13, R25, EC5, EC4
34
NO LOAD
AC 25.8V
AC 4.0V
REMARK
T : 16.67ms(60Hz)
T : 250 ns(4MHz)
REMEDY REMARK
NO LOAD
NO LOAD