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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.
ST-SE370 SECTION 3 TEST MODE
NOTE : The preset data will be erased when this test mode is used. Therefore, take down the data before setting this mode and preset the data again after completing operations in this mode. 1. Display Tube and Key Check Mode 1-1. Display Tube Check 1-1-1. Turn OFF the power. 1-1-2. While pressing 1 and BAND together, turn ON POWER . 1-1-3. While continuously pressing 1 and BAND together, check the following. Microcomputer version indication (1 sec) t All light up (1) t 8-digit test pattern (2) t 2-digit test pattern (3)
(1) All light up
(2) 8-digit test pattern
(3) 2-digit test pattern
The display changes every 500 msec. 1-2. Key Check 1-2-1. Release 1 and BAND . The KEY CHECK mode will be set. 1-2-2. All key numbers will be displayed. Key Number : 23 1-2-3. Each time the key is pressed, the key number will be counted down. Each key will be counted only once, at the first time. 1-2-4. When all keys have been pressed, the process will end and the factory preset will be entered. 2. Entering the Factory Preset To skip â1. Display Tube Key Check Modeâ, and factory preset : (1) Turn OFF the power. (2) While pressing 3 and BAND together, turn ON POWER . 3. Circuit Check Mode Set to the reception frequency that the circuit can receive (FM : STEREO, RDS stations). (Set the input level to above 70 dB.) This enables circuit check to be performed in any of the reception modes-FM, AM (MW, LW). Set to a desired band before setting the test mode. (1) Turn OFF the power. (2) While pressing 4 and BAND together, turn ON POWER . â¢ The items in the following table will be checked automatically in order every 2 seconds.
Display TUNED IF SIG L ST RDS
AST signal = LOW IF COUNT OK SI LEVEL = 70dB > ST signal = LOW RDS DATA OK
OK or NG OK or NG OK or NG OK or NG OK or NG
AM (MW, LW) IC201 NG, RV201 adjustments OK or NG TB101, IC201 NG TB101 NG TB101 NG IC801 NG
Complete owner's manual in digital format. The manual will be available for download as PDF file aft…