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It's a good manual, this one it's a scan from the original factory service manual, great quality 100% readeable. definetely it worths what I paid for.
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A good manual! fast service and good qualityi for pdf document.
thanks!
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Very helpful and complete manual. Maybe only one negative is schematics have sometimes unreadable name of the parts. But it's not a big problem.
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Excellent high quality schematics brought my old Heidelberg back to life. Fast download at a reasonable price. Thanks.
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This document is just what I was looking for, it´s very useful, it contains adjustment procedures for the final stage of the power amp and also
has a complete wiring diagram and description of the main semiconductors used in the design.
RC-V7
CIRCUIT DESCRIPTION
Panel Section (LCD ASSY: B38-0772-65)
The panel section controls serial communications with the main unit control section, the key input circuit, the display circuit, and the dimmer circuit through the microprocessor (IC4).
� Display circuit
Display section is a 152x45-dot full-dot matrix LCD controlled by two LCD. As shown in Figure 1, the master IC (IC5) side is connected to 32 common dots and 80 segment dots and the slave IC (IC6) side is connected to 13 common dots and 72 segment dots. The LCD drive voltage is obtained by raising the power supply voltage (5V) within the IC. Also, the contrast level (LEBEL8) for resetting is adjusted with R19 to be optimum.
� Serial communications circuit
A buffer is inserted in order to protect the microprocessor ports.
� Key input circuit
There is one microprocessor port for each panel section key. The PSW key is pulled down and the other keys are pulled up with software within the microprocessor. The rotary encoder is input directly to the microprocessor.
32 COM
LCD 152 X 45(dot) 80 SEG LCD Driver IC 5 72 SEG LCD Driver IC 6 13 COM
Microprocessor IC4
Fig. 1 Display circuit
9V LED1 R57 LED2 LED3 LED4
� Dimmer circuit
The dimmer circuit switches the lamp brightness to one of four levels or OFF. (See Table 1.) The current flowing to the LEDs is varied by selecting resistors from R55 to R58. Dimmer level 1 2 3 4 OFF P60 H L L L L P61 L H L L L P62 L L H L L P63 L L L H L
P62 IC4 Microprocessor
R58
P60 Q13 P61 Q12
Table 1 Port logic
Q11 P63 Q10
Fig. 2 Dimmer circuit 2
R56
R55
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