Memorex MT1191V, Service Manual

Page: 6 / 23

IC, TRANSISTOR AND CRT COMPLEMENT
- 5 -
INTEGRATED CIRCUITS
IC101 TA87C-B2 Microcomputer
IC102 M24CO2B EEPROM
IC301 TA1268N IF/Video/Chroma/Deflection
IC311 NJ7809FA Voltage Regulator
IC501 AN5512 Vertical Deflection Output
IC601 STR30130 AVR
IC671 NJ7805LD Voltage Regulator and Reset
TRANSISTORS
Q101 DTC143ZS Vertical Synchronizing
Q102 2SC945(P) Horizontal Synchronizing
Q173 2SC945(P) SD Signal Buffer
Q301 2SC945(P) SIF Signal Buffer
Q302 2SA733(P) Video Buffer Amplifier
Q303 2SC945(P) Video Out
Q351 DTC143ZS Service Mode Switching
Q451 2SC1573A(R) Red Color Driver
Q452 2SC1573A(R) Blue Color Driver
Q453 2SC1573A(R) Green Color Driver
Q551 2SC1473A(R) Horizontal Driver
Q552 2SD1877 Horizontal Driver
Q601 2SC945(P) Power On/Off Relay Driver
Q801 2SC945(P) Audio Amplifier
Q802 2SA950(0) Audio Amplifier
Q803 2SC2120(0) Audio Amplifier
PICTURE TUBE
V451 51GGD95X CRT (SUFFIX A) V451 A48LRH93X(W) CRT (SUFFIX C)
V451 510UEB22(DY) CRT (SUFFIX B) V451 A48LSD095X CRT (SUFFIX D)
V451 A48LGS30X CRT (SUFFIX E)
CHASSIS REMOVAL
1. Remove 4 screws (177) from Cabinet Back (AB) and remove Cabinet Back from rear.
2. Discharge anode lead at CRT chassis ground through a 10kohm resistor.
3. Disconnect anode lead from CRT.
4. Disconnect CRT Socket P.C. board (PCB-2) from CRT(V451).
5. Disconnect 3 connectors (CN501 (DY501), CN601 (L601) and LCN801) from Main P.C.
board (PCB-1).
6. When replacing chassis, reverse the above procedure making certain that all leads are
fastened in their original places.
CRT REMOVAL
CAUTION: Wear shatterproof goggles and exercise proper handling precautions when working
around high vacuum picture tubes.
1. Remove chassis per instructions under CHASSIS REMOVAL.
2.
Remove Convergence Magnet Assembly (MG451) from neck of CRT.
3. Remove Deflection Yoke (DY501) from neck of CRT
4. Remove 3 wedges (142) from CRT
5. Remove Degaussing Coil (L601) from CRT
6. Remove braid wire (331) and spring (158) from CRT
7. Lay cabinet face down on some protective material.
8. Remove 4 CRT mounting screws (156).
9. Remove CRT from Cabinet Front (AA).
10. To install new CRT, reverse above procedure.
11. Perform purity and convergence adjustments.