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Thank You for fast delivery for the sheme.
Everything allright.
Thanks & best regards Franz
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again you did a very good job. It was fast too. Photocopy are really readable and clear
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Probably it never existed a 1081 official service manual from Commodore, it's look more like a NAPCEC service manual & diagrams compilation of the 1084 series and his variants, like the nap6523, 8cm505, 1084S, 1084P and obviously the 1081. It's more complete than other scans and the quality of the scans also are far superior. It has two circuit diagrams variants of the 1081, mono and stereo versions. It doesn't include a diagram for the Philips CM8500 or CM8501, they look like the 1081 but they are slightly different.
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Rapid, clear well done as all the scheme I downloaded from this site. Great job very functional and very useful
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Great copy of the manual, has all information required for servicing,
IC, TB31224F
Pin No. 1 2 Pin Name TX-IN VCC3 I/O I � Description Input terminal of TX VCO oscillation signal. Power supply terminal. LOCAL OSCILLATOR input and output terminals. Colpitts oscillator is formed by 3, 4 LO-1, LO-2 O internal emitter follower and external X�tal. And external injection is possible from pin 3. 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 SIG OUT CLK DATA STB FIL-OUT FIL-IN COMP-OUT C-NF MIC-OUT MIC-IN PRE-IN PRE-OUT EXP-OUT RECE-IN RO1 RO2 O I I I O I O � O I I O O I O O Output terminal of detection signal. It is the open drain output. Input terminal of clock. Input terminal of serial data. Input terminal of strobe signal. Output of FILTER AMP. Input of FILTER AMP. Output of COMPRESSOR. Feedback circuit of T type is formed by external capacitor with SUM AMP. Output of MIC AMP and connected directly to input of SUM AMP. Input terminal of MIC AMP. Inverted input of PRE AMP. Output of PRE AMP. Connected directly to EXPANDER. Output of SUM AMP at EXPANDER. The signal from gain cell is gained by inverted amp. Inverted input of RECEIVER AMP. Receiving output for a dynamic receiver. Used for BTL output type with RO1 terminal when a ceramic receiver is used. BATTERY ALARM terminals. When VCC decrease VBAT-L, This terminal outputs 21 BAT-ALM O �H� level. Detection voltage is controlled by data bit. This terminal is open collector output. 22 23 24 25 26 27 28 29 30 31 32 33 34 RSS1 DATA-OUT D-COMP-IN N FIL-IN N FIL-OUT AF-OUT QUAD IF-OUT GND1 DEC IF-IN VCC1 2ND MIX-OUT O O I I O O I O � I I � O Power supply terminal. MIX output terminal. Output impedance is around 1.5k�. This terminal outputs DC level according to input signal level to IF AMP. Dynamic range is around 70dB. Output terminal for wave form shaping. This terminal is open collector output. DATA COMPARATOR input terminal. This terminal input demodulation signal of DATA. NOISE FILTER input and output terminals. BPF is composed of external capacitors and resistors. Connected internally to rectifier circuit by coupling capacitor. Demodulated signal output terminal. Carrier leak is small as LPF is built-in. Output impedance is around 360�. Phase shift signal input terminal of FM demodulator. Output terminal of IF AMP. GND terminal. 2nd IF input and decoupling for bias. Input impedance is around 1.5k�. Input the serial data for controlling IC.
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