Service manual

SRP-150
Rev. 1.02
- 3 -
4. Hardware ...................................................................................................................................................28
4-1 Wiring Diagram .....................................................................................................................................28
4-2 Block Diagram.......................................................................................................................................30
4-3 Special Circuit Descriptions ..................................................................................................................32
4-3-1 Power Circuit..................................................................................................................................32
4-3-2 RESET Circuit................................................................................................................................33
4-3-3 Cash Drawer Circuits .....................................................................................................................34
4-3-4 RS-232C Communication Block Diagram......................................................................................34
4-3-5 Parallel Communication Block Diagram ........................................................................................35
4-3-6 USB2.0 Communication Block Diagram ........................................................................................36
4-3-7 DIP Switch Circuit ..........................................................................................................................36
4-3-8 Thermal Printer Head Circuit .........................................................................................................37
5. Disassembly and Assembly ....................................................................................................................39
6. Maintenance ..............................................................................................................................................42
6-1 Maintenance .........................................................................................................................................42
7. Troubleshooting .......................................................................................................................................43
7-1 Power Problem .....................................................................................................................................43