RCA 18V100 service manual Component Replacement Procedure, Console Disassembly

Page 11

 

CONSOLE DISASSEMBLY

 

 

 

The console consists of six separate subassemblies: the two

 

halves of the cabinet, printed circuit board, two keyboards,

r

and a "Clear" switch/power-on indicator.

 

 

The upper and lower halves of the cabinet are separated

 

by removing 5 Phillips-head screws. With the bottom cover re-

 

moved, the underside of the printed circuit board is exposed.

 

Lift the PC board up at the cartridge socket side as shown in

 

Fig. 24. This exposes the component side of the board. The

 

board stands on edge if set between pillar (near "Clear" switch)

 

and flange of cabinet upper half as shown.

 

 

 

CARTRIDGE

 

 

 

RODE ^ "***

 

 

 

^k^===^

 

 

'^A x%

*

 

 

\$

 

 

 

SV/^/^^^^^ "^-^

CART

 

X^Ss^^

 

SOCKET

 

] \^^

 

SL0T

"\°

~

TOP HALF

OF CABINET

 

 

Figure 24. PC Board in Wiring Access Position

 

NOTE: The channel-change and sound on/off

 

switches, plug-in cartridge connector and other

 

components mounted on the PC board are not

 

field replaceable. All PC board faults (except

 

speaker) require board exchange.

 

CAUTION: Tuner sprays containing silicon must not

r

be used on slide switches. Irrepairable switch dam-

age will result.

COMPONENT REPLACEMENT PROCEDURE

 

 

PC Board Removal

 

Disconnect black, white and yellow wires from board; un-

 

solder coaxial cable from board and carefully pull out key-

 

board ribbon leads from RC board connectors. See "PC Board

 

Packing and Shipment" for board exchange details (Page 14).

 

Keyboard Replacement

1.Keyboard replacement requires console disassembly as

described above.

2.Unplug the ribbon cable of the defective keyboard from

r* the ribbon connector on the PC board by pulling the ribbon

straight out of the connector.

3.Release the keyboard from the console by unlatching

two brown colored latches as illustrated. Keyboard is now

free of console.

Figure 25. Releasing Keyboard from Console

4.Install new keyboard by feeding ribbon cable through opening in console before latching keyboard in place.

5.Push ribbon cable into connector.

NOTE: Some Studio II units use unenclosed rib- bon connectors on PC board. Ribbon cable must center in the connector so that all 1 1 leads contact for proper operation.

6.If ribbon cable from keyboard fails to make good contact

in connector, trim back 1/16 inch from edge with ordinary

household scissors to expose fresh contact.

Figure 26. Trim Ribbon Cable with Scissors to Repair

Damaged Edge

Coaxial Cable Replacement

1Remove bottom half of console cabinet. Pry off metal

shield covering end of coaxial cable.

CAUTION: Pry carefully so as not to damage foil

wiring on PC board.

2.Disconnect cable by unsoldering shield first. Do not overheat foil.

3.Install replacement cable as shown by soldering center

lead first.

4.Re-install shield cover carefully and firmly. Center coaxial

11

Image 11
Contents Itc/i Table of Contents Switch Power SupplyKeyboard ON/OFF Indicator Light Selector SwitchSystem Connections Test ProceduresTo Antenna Power System CheckingOne at a time of Keyboard A, and then Keyboard B. As 9a appears on screen immediately, and TesterBoard must be replaced £ sj Overall Block Diagram of Studio II SystemThree Numbers to be Added Enter a series of wrong answers, beginning with A1 As each Punch up Addition game Key A5. Sound switch Must be onKeyboard Tests Malfunction. If Tester is unavailable, the keyboards can beCoaxial cable from the console to the twin lead and com Pletes the DC circuit between the console and power supplyWith the switch in the TV position, it disconnects the con ComponentsStudio II Console Assembly Console Disassembly Component Replacement ProcedureMinimize radiation of modulated carrier Saw. See for dimensionsMilliseconds or more sync on Line and vertical input Clock Frequency Adjustment ProcedureScope Time-Base Locked to 60Hz Power Line Reconnect black, white and yellow leads from PC boardPC Board Packing and Shipment Exchange Plan DescriptionReturn Shipping Label Form 3E4589 RCA Distributor and Special Products Division Deptford NJ