Samsung CX528ZSE Service Manual page 65

REMOCON (RM-101) BOARD AND CONTROL BOARD
| Resut |
SYMPTOM CHECK POINT CAUSE
NO GOOD
* Power relay does ) AC voltage between pins S2 of | AC 13V * Defect in 1801, F801, RDO!
operate paral
(2) Pressing the power button, OV + Defect or poor soldering of
check the DC voltage of Pin RROG, RQO2, Relay switch
27 of RICO1 (RLO1), RRO1.
+ Defect or poor contract of
RICO1, CNP801.
* Poor contant of CNRO1 or
defect to +125V line on
main board.
+ Defect in Q101, R115, D101
on main board.
(3) Emitter of RQO1. Below 2V| * Defect in RQO1, RDO6, RRO1,
RICO}.
(4) Anode of RD24. —_\— * Defect in RDO2—03, RRO}.
* Defect in +16.5V line and
VOLTAGE OF BAND STATE Q101, D101, R115 of main
TEST POINT | vHF Low | VHF HIGH a
board or tuner.
B+ 12V Ke
: i
* Defect in RICO1, RICO2.
* Channels are noe Check CNRO3, CNRO5, RQO6, * Poor contact or defect of
displayed. RQO7, RICO. CNROS, CNROS +5V lines.
* Channels up/down| Pressing the channel, volume fine * If keyboard input voltage has
of Fine turning up/down button, check RICO1 5V but it doesn't deliver to
up/down, Volume | (The Pin 36-41 of RICO1 are keyboard output, defect or
up/down, Analog | keyboard input and the Pin 17- poor contact of CNRO2, CNRO4
up/down, etc. 21 of RICO1 are keyboard output) or select control board.
doesn't operate. If there is no keyboard input
voltage, defect of poor contact
of RICO1.
(1) Depressing the transmitter key, | 40KHz | Below Defect in batteries, QT02
check the collector waveform of | 1Vp—p | 0.5Vp—p coilector voltage is 1Vp—p
QT02 or QTO3 on Transmitter and the frequency of
PCB. collector waveform is 40KHz.
(2) Depressing the transmitter key, | 4.5Vp—p| Over + Defect in PAO, RICO1, or
check Pin 35 of RICO1. 5Vp—p the associated parts.
65
* Voltage chart of | (1) Pin 7 of CNRO1.
selector board
(2) Pin 9 of SNROV.
+ Voltage chart of
tuner.
*
*
Pin 1 of CNRO2 or Pin 1, 2 Defect in RICO1.
of CNRO4.
* Auto search up/
down doesn't
operate.
*
* Remote control
doesn't operate.