Cd Module; Check Flex Connection From Cdr Main Board - Philips CDR775 Service Manual

Faultfinding trees
7.2

CD Module

CD MODULE
NO DISC
POWER ON
DISC
DETECTION
STARTS?
YES
DISPLAY?
YES
PRESS
<OPEN/CLOSE>
TRAY?
YES
LOAD DISC
(CD-DA OR PARTIALLY
RECORDED CD-R/CD-RW)
PRESS <OPEN/CLOSE>
TOC?
YES
SEE NEXT PAGE:
PLAYBACK
•

CHECK FLEX CONNECTION FROM CDR MAIN BOARD

•
POWER SUPPLY
⇒ +5V, +12V AT TESTPOINTS 28 AND 27
⇒ +5V AT CONN. 1000 PINS 1 AND 3
⇒ +5V AT IC7005 PIN 14
⇒ +3V3 AT IC7000 PINS 5,17,21,57, CHECK SAFETY RESISTORS
NO
⇒ +5V AT IC7020 PIN 25
⇒ +10V AT IC7020 PINS 26, 27, 28
⇒ +12V AT IC7021 PIN 5, CHECK SAFETY RESISTOR R3131
⇒ +12V AT IC7022 PIN 5, CHECK SAFETY RESISTOR R3154
⇒ +5V AT IC7025 PIN 16
⇒ +5V AT IC7202 PIN 38, CHECK SAFETY RESISTOR R3308
⇒ +3V3 AT IC7309 PINS 4 AND 13, CHECK SAFETY RESISTORS R3215, R3216
⇒ +12V AT IC7120 PIN 8, CHECK SAFETY RESISTOR R3263
NO •
CLOCKS
⇒ 8.4672MHz AT TESTPOINT 7
⇒ 12MHz AT TESTPOINTS 29 AND 30
⇒ 11.2896 AT TESTPOINT 10
⇒ 2.1168MHz AT TESPOINT 20
⇒ 44.1kHz AT TESTPOINT 21
•
DISPLAY
⇒ SEE FAULTFINDING GUIDE DISPLAY BOARD
•
MICROPROCESSOR 7202
DIAGNOSTIC SOFTWARE : MECHANICAL SERVICE DIAGNOSTICS CD LOADER : TRAY TEST
⇒
CHECK TRAY MOTOR VOLTAGES TRAY+, TRAY-
NO
⇒
MICROPROCESSOR 7202
⇒
CHECK TRAY MOTOR DRIVER IC7021
⇒
REPLACE OR REPAIR CD LOADER ASSY:
TRAY MOTOR ASSY 02, BELT 11
•
DIAGNOSTIC SOFTWARE : MECHANICAL SERVICE DIAGNOSTICS CD LOADER :
⇒
CHECK WIRING TO CDM
⇒
CHECK POWER DRIVERS 7021, 7022, 7020
⇒
CHECK VOLTAGES ON POWER DRIVERS (SEE CIRCUIT DIAGRAMS)
⇒
TESTPOINTS 4, 5, 6 : PULSE DENSITY MODULATED SIGNALS
•
HF PATH
NO
⇒
TESTPOINTS 1, 2, 3, 9 : EYEPATTERN
⇒
CHECK RW AT TESTPOINT 8 : HIGH FOR CDDA AND CDR DISC, LOW FOR
CDRW DISC. EYEPATTERN OF CDRW DISC WILL BE AMPLIFIED ( ≈ X 2.5).
EYEPATTERN OF CDDA DISC WILL BE ATTENUATED( ≈ X 0.8)
⇒
CHECK S1,S2 AT TESTPOINTS 25 AND 26 (SEE CIRCUIT DIAGRAMS)
TESTPOINTS 20, 21, 22: I 2 S DATA, WCLK, SCLK
⇒
•
REPLACE OR REPAIR CD LOADER ASSY (CDM MECHANISM)
FOCUS TEST & SLEDGE TEST
Figure 7-5
CDR775 7.
CL 96532086_030.eps
GB 47
080999