Marantz MAR770 - Manual (Page 16)

14
7.2 CD Module
Figure 7-5
NO DISC
POWER ON
PRESS
<OPEN/CLOSE>
LOAD DISC
(CD-DA OR PARTIALLY
RECORDED CD-R/CD-RW)
PRESS <OPEN/CLOSE>
DISC
DETECTION
STARTS?
DISPLAY?
CHECK FLEX CONNECTION FROM CDR MAIN BOARD
POWER SUPPLY
+5V, +12V AT TESTPOINTS 28 AND 27
+5V AT IC7005 PIN 14
+3V3 AT IC7000 PINS 5,17,21,57, CHECK SAFETY RESISTORS
+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
CLOCKS
8.4672MHz AT TESTPOINT 7
12MHz AT TESTPOINTS 29 AND 30
11.2896 AT TESTPOINT 10
DISPLAY
SEE FAULTFINDING GUIDE DISPLAY BOARD
MICROPROCESSOR 7202
DIAGNOSTIC SOFTWARE : MECHANICAL SERVICE DIAGNOSTICS CD LOADER : TRAY TEST
CHECK TRAY MOTOR VOLTAGES TRAY+, TRAY-
MICROPROCESSOR 7202
CHECK TRAY MOTOR DRIVER IC7021
REPLACE OR REPAIR CD LOADER ASSY:
TRAY MOTOR ASSY 02, BELT 11
TRAY?
NO
NO
NO
YES
YES
YES
TOC?
YES
NO
DIAGNOSTIC SOFTWARE : MECHANICAL SERVICE DIAGNOSTICS CD LOADER :
FOCUS TEST & SLEDGE TEST
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
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: I2S DATA, WCLK, SCLK
REPLACE OR REPAIR CD LOADER ASSY (CDM MECHANISM)
SEE NEXT PAGE:
PLAYBACK
CD MODULE
+5V AT CONN. 1000 PINS 1 AND 3
+12V AT IC7120 PIN 8, CHECK SAFETY RESISTOR R3263
2.1168MHz AT TESPOINT 20
44.1kHz AT TESTPOINT 21
CL 96532086_030.eps
080999