Epson MX-80 Technical Manual page 4

LIST OF FIGURES
CHAPTER 3
DISASSEMBLY, ASSEMBLY AND TROUBLESHOOTING
Fig. 3.1 Removal of Manual Paper Feeding Knob ............................... 3-3
Fig. 3.2 Removal of 4 Screws ........... : '.' ................................... 3-3
Fig. 3.3 Locations of Respective Components .................................. 3-4
Fig. 3.4 Dismounting of Driver Circuit Board ................................... 3-5
Fig.3.5 Removal of Control Circuit Board ...................................... 3-6
Fig.3.6 Removal of Power Transformer ........................................ 3-7
Fig.3.7 Dismounting of Fuse and Filter Circuit Board ................... , .. , ... 3-8
Fig. 3.8 Dismounting of M-3210 Printer Mechanism ............................ 3-9
Fig. 3.9 Dismounting of Print Head Unit ....................................... 3-10
Fig. 3.10 Dismounting of Home Position Sensor Assy ............................ 3-10
Fig. 3.11 Unsoldering of Four Lead Wires ....................................... 3-11
Fig. 3.12 Dismounting of PTS Sensor Board Assy ............................... 3-11
Fig. 3.13 Dismounting of Timing Belt Motor Assy .............. , ................. 3-12
Fig. 3.14 Unsoldering of Lead Wires ............................................ 3-13
Fig. 3.15 Dismounting of Paper Feeding Motor Assy ...................... , ...... 3-13
Fig. 3.1 6 Dismou nti n g of PE Board Assy .................... , ................... 3-1 4
Fig. 3.17 Normal Waveform of Signal PSEN ..................................... 3-20
Fig. 3.18 Normal Waveform of Signal ALE. .............................. , .•..... 3-20
Fig. 3.19 Normal Waveform of Signal SyNC ................. , ............. , ...... 3-21
Fig. 4.1
Fig. 4.2
Fig. 4.3
Fig. 4.4
Fig. 4.5
Fig. 4.6
Fig. 4.7
CHAPTER 4
MAINTENANCE
Lube Points and Bonding Points ...................................... 4-3
Applied Voltage vs. Driving Pulse Width ............................... 4-4
Timing Signal PTS (Pin No.39 of 8049). ............................... 4-5
Relationship between Timing Signal and Signal PRAV ................. 4-5
Adjustment of PTS Sensor Board •............. , ....................... 4-6
Relationship between Timing Signal and Reset $ignal ................. 4-6
Adjustment of Home Position Sensor Assy ................. , ...... , .... 4·7
CHAPTER 5
CIRCUIT DIAGRAMS
Fig. 5.1 Connection Diagram of Control Circuit. ............. , .................. 5-3
Fig. 5.2 Connection Diagram of Driver Circuit .................. , ....... , ....... 5-4
Fig. 5.3 Component Layout of Control Circuit .................................. 5-5
Fig. 5.4 Component Layout of Driver Circuit ................................... 5-6
REV. A