Panasonic KX-T2388 Service Manual And Technical Manual page 27

KX-T2388 |
Mi RECORD CIRCUIT (OGM and ICM)
Circuit Operation:
(Recording Signals)
Recording input signals from the telephone line or MIC is selected by pin 9 of IC2.
The signal from the telephone line flows from Q3 through R50, then passes through C31, and pin 20 of IC2.
The signal of the built-in condenser microphone goes to pin 19 of IC2 via C42 and R73.
The selected input signals are amplified an amplifier in IC2. Then go to pin 16 of IC2 —» C46 > R78 > pin 15 of IC2 > pin 2
of IC2 — C39 + Head.
The other output goes to the MONITOR CIRCUIT .
The all circuit are consists of R68 and C36.
(Signal)
The beep tone generated by IC1.
The beep tone of the ICM recording (from pin 9 of IC1) is processed to the ICM recording head via C35 > R71 > pin 15 of
IC2 — pin 2 of IC2 > C39 > Head.
(Erase) .
When in the Rec mode, pin 11 of IC1 is High.
The voltage is applied to the Erase Head, thus the Erase Head is activated.
The bias current is applied the R/P Head via R72.
Circuit Diagram
R50 R15
ER
Se Q3
~< Tel Line
R55 633
HEAD
Mic
QS
AI7
ie (2 JACK
oe,