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Service Manual
RCA Model 18V100
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Home TV Programmer
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Studio II
Home TV Programmer, Model
18V100
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Operation Testing Disassembly Parts List
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plugs RCA Parts Distributors. Called "Tester I", the cartridge PRODUCT SAFETY NOTICE the console and checks out the digital circuitry into the slot in Page 15 in about 30 seconds. See Page 4 for description and Studio II uses an isolated power supply to operate the information. electronic circuitry. The leakage current to ground of this for ordering repair. See Page s> power unit should be checked at time of game 9 for test procedure. PARTS LISTAVAILABLE SERVICE For those organizations planning
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POWER SUPPLY II TV/STUDIO 18 FOOT UNIT SWITCH SELECTOR CORD CONSOLE r KEYBOARD r B KEYBOARD A CHANNEL 2/CHANNEL 3 SWITCH SOUND ON/OFF STUDIO II CONSOLE CLEAR SWITCH ON/OFF BUTTON (UNDER CONSOLE) INDICATOR LIGHT II Major Assemblies Figure 1. Studio Description RF oscillator/modulator and audio circuits) DESCRIPTION console (digital, GENERAL system are on a single PC board. Signal information from the console Studio II is a sophisticated, microprocessor-based the Selector Switch Unit through singl
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Studio II Servicing The recommended Studio II service procedure is to deter- is in one of the periphery mine whether the problem components, the interconnecting cables or in the console If PC board in the console is found to be faulty, itself. the it must be returned to RCA for repair on an exchange basis. SELECTOR See Page 14. SWITCH IMPORTANT: No attempt should be made to adjust or repair an inoperative PC board —with adjustment the exception of the clock-frequency described on Page 13. TO ANT
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if there is no trouble, the is indicated on the TV screen; test for the two keyboards. cartridge sets up a substitution The Test Cartridge requires NOTE: test. Use the special of the power unit during instead of the 500mA power unit (see Parts List) unit. original power on Studio II console. In- Press and hold "Clear" button 1. "Clear" button. into slot while holding sert Tester I cartridge label Sharp "Freeway" Display Insert cartridge into console with Figure 8. Adjust Receiver for NOTE: Follo
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!<<>£: sj sj laxoos IT QdVO 3HV0 -M- -c+- J Figure 10. Overall Block Diagram of Studio II System
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the "OK" function), the pattern shifts to satisfactory keyboard flip-flops between black-on- pattern of Fig. 9d. The pattern CONTROLLED OPPOSING CAR button is actuated. until the "Clear" COMPUTER white and white-on-black BY THE sequence normally, the whole If the "Clear" button functions completes the the button is released. This starts again as "Tester I" test. the original power unit into NOTE: Reconnect unit with the test the system. Store the special future use. cartridge for Operational Che
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— — Keyboard Tests The keys of Keyboard B "write" on the screen according to the white arrowheads on the keyboard (Fig. 15). To form available, use it to isolate keyboard If "Tester I" cartridge is an interesting pattern, press "Clear" key, then A2, B2 15 malfunction. If Tester I is unavailable, the keyboards can be times, B6 once, and then BO. The memory stores up to 130 "Addition" game: tested using the built-in key entries or "moves". After 130 moves, the computer auto' Step 1 : Punch up "Add
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the metal box or rivets holding terminal board. If either ohmmeter polarity on the to 50 ohms resistance with negative or rivets, snowy pictures may conductor, antenna lead touches the box (With positive polarity on center center conductor. rivets which result. (Late production units use insulated 30k ohms.) See "Coaxial resistance should be between 20 and eliminate problem)) Replacement". Cable Unit Tests Power Supply Switch Unit Tests Selector Unit operates between carefully chosen r The Power
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^J II Console Assembly Figure 23. Studio 10
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3. Release the keyboard from the console by unlatching CONSOLE DISASSEMBLY two brown colored latches as illustrated. Keyboard is now The console consists of six separate subassemblies: the two free of console. printed circuit board, two keyboards, halves of the cabinet, and a "Clear" switch/power-on indicator. r separated The upper and lower halves of the cabinet are by removing 5 Phillips-head screws. With the bottom cover re- moved, the underside of the printed circuit board is exposed. in Lif
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clipped pigtails back and Shield must be fully seated to 4. From underside of cover, bend cable in slot in cover (Fig. 27). diagonal collapse black plastic holder with needlenose pliers or minimize radiation of modulated carrier. console holes using pliers or cutters. Remove holder from cutter. holder. Press holder gently into hole in 5. Install new LED sJ console cover until it clicks into place (Fig. 29). * Replace Cable. Figure 27. Disconnect Co-Ax Shield First to J Resolder Center Lead First
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. nected with reversed polarity. Use fabricated tool (Fig. 28) to CLOCK FREQUENCYADJUSTMENT PROCEDURE push LED into holder. LED "clicks" into place. Any tool Incorrect clock frequency adjustment causes pattern weave without a shoulder usually pushes LED out of the holder. on screen. This results from a beat note between the vertical 7. Form snipped leadwires as shown in Fig. 31 and connect sync rate of Studio II and the hum frequency in the TV re- new LED pigtails to them. Solder quickly to prev
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Exchange PC Board foam plastic. If two halves the molded-in supports in the DESCRIPTION EXCHANGE PLAN relative position foam packing fail to mate easily, reverse of Swannanoa, operates a PC board refurbishing facility at RCA of one to another. boards sent to this facility are North Carolina. Defective PC Use crumpled news- 2. Pack foam enclosure in carton. ^/ of $1 5.00* refurbished and returned to the sender at a cost cushion around foam enclosure. papers as exchange board is repairable. provid
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1 STUDIO II PC BOARD EXCHANGE QUESTIONNAIRE check money order for $15. 1 Please pack completed questionnaire in container with defective board with or 1 (Price subject to change without notice.) < Studio II Serial Nn 1 Please describe defectsymptom (s). (Nodisplay, s r 1 C/3 partial display, no sound, etc.) RETURN SHIPPING LABEL I h- e? Firm Name z: o _i < Firm Address i- o Pity State Zip Continuous Defect: Intermittent ' Note: For in-warranty board exchange, include Attn: RCA Form PA737 "Repair
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^ ^ "j 3 Printed in U.S.A. 11/77 J NJ Tmk(s) Marca(s) Registrada(s) Form 3E4589 RCA | Distributor and Special Products Division | Deptford 08096 ®
