I was very glad recieving the service manal from You. Manuals were delivered promptly and were correct as advertised. A complete and very usefull service manual with all details. Thank you!
Good product. All the information is invcluded, but due to the complexity of the amplifier, it still is difficult to get it to operation again.
Text excerpt from page 16 (click to view)
4. Cannot make a phone call (pulse).
Can the base and handset be connected? OK While in TALK MODE, press NG dial key of the handset. Check whether square waveform from pin 22 of IC5 is fed. OK Check Q10, RL1 and their peripheral circuits. NG See 3. The base and handset cannot be connected.
Check IC5.
5. Cannot make a phone call (tone).
Can the base and handset be connected? OK While in TALK MODE, press dial key of the handset. Can tone waveform from Pin 20 of IC8 is fed? OK Can tone signal be heard from the handset speaker? OK Check the base TEL-line circuit and RELAY control circuit. NG Check IC1, Q3 and their peripheral circuits. NG NG See 3. The base and handset be cannot be connected.