Premium GPAC12039, Service Manual

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9. LCD display error
10. Press the remote “ON/OFF” button. transmitting signal shows
11. Replace the button
12. Voltage of remote chip IC1 changes
13. Chip error
14. Voltage of Q1 changes
15. Replace three-electro tube
16. Voltage of Led changes
17. Transmitting error
18. Receiver error
8. PCB Checking
8.1. Pay attention to replacing the parts:
1) Human body takes static electricity. So before repairing and replacing parts, please confirm
it's earthed safely. Especially before contacting some microcomputer or integrated circuit,
make sure release the static electricity completely(confirm there is earthing loop on the wrist
）
.
2) While working on a platform with electricity on. Please make sure there is a insulating mat
and there is no metal chips on it. If any metal chips make contact with the part, it is likely to
damage the other parts.
3) Before replacing element cut off the power. If the operation is with electricity on. it may
cause a shock. short circuiting or other injuries.
4) During the replacement or repair of parts. please confirm whether electric wire or not on the
circuit board surface position of diode. Because the coarseness of circuit connector may
cause the wire and component broken by bending and shaking.
5) Before welding he conductor and the new part. it should be wiped up with emery paper or
similar things. Otherwise the wire and part may be oxidized and makes weilding difficult.
6) While welding. please do not use high powered electric iron for too long time. otherwise
parts with low thermal resistance are easy to be broken.
7)The heating energy of Electronics tool iron should be passed on to the whole welded object.
Otherwise the welding will not work well.
8)Welding material should be used as little as possible. If too much material will cause circuit
malfunction.
8.2. Process
Replace parts according to the following process