3. Specific item failed in Diag All CheckIf not fixed to OL� or OH�, loose connection between power sup-
A mounting failure of IC or faulty IC for that item is doubtful.ply block and IF-83 board or between IF-83 board and MB-100
If O1901NG� is displayed, a loose connection of CN801, mount-board, loose connection of connectors, or faulty IF-83 board is
ing failure of AUDIO DSP (IC701), or faulty IC is doubtful.doubtful.
Also check the following, as the set does not work normally under
4. Picture and sound are not outputtedthese conditions.
Check the CN801 for connection, and the flat cable for damage or
loose connection.4. At [POWER] button ON, LED lights in green but
fluorescent display tube does not light
5. Picture is outputted, but sound is not outputtedLoose connection between power supply block and IF-83 board,
A mounting failure of AUDIO DSP (IC801) or AUDIO Dloose connection of connectors, or fACaulty IF-83 board is doubtful.
(IC802, IC803), power supply failure, or faulty IC is doubtful.
5. Picture and sound are not outputted
6. Sound is outputted, but picture is not outputtedLoose connection between power supply block and IF-83 board
Using an oscilloscope, measure the yd, yh, yl, uf, uj, and i;or between IF-83 and AV-58 board or between AV-58 board and
pins of AVD (IC503) to check if analog signals are outputted rMB-100 board, loose connection of connectore-s, or faulty AV-58
spectively. If not outputted, a soldering failurboard is doubtful.e of that line, a short
with other line, missing capacitor or resistor, or faulty AVD is
doubtful.6. Picture is out outputted correctly
A mounting failure of BNR (IC601) on the MB-100 board, or faulty
6-11-3. Drive Auto Adjustment stops by an errAVD (IC503) or orARP&SERVO (IC302), or faulty 27 MHz output
Faulty analog circuits of ARP&SERVO (IC302) or f(frequencaulty peryiph-, waveform) from 27-1OUT (3 pin) of PLL (IC102) is
eral circuits of DIGITAL SERVO (IC202) on the MB-100 boardoubtful. d,
faulty optical pickup, or loose connection of flat cable is doubtful.
6-11-5. Power is not Supplied
6-11-4. Power is Supplied but Unstable1. Red LED does not light when AC is supplied
If Syscon Diagnosis completed successfully, basically the boardsThe power (EVER +3.3 V) is not supplied to the IF CON (IC404)
other than MB-100 board, connection, optical pickup, or mechani-on the IF-83 board.
cal deck will be faulty.The X401 does not oscillate.
1. Red LED does not light when AC is supplied2. At [POWER] button ON, LED is kept in red
Check if the specified voltage is outputted from the EVER -11 V(standby state)
(3 pin), EVER +3.3 qa pin), and EVER +11 V (qd pin) ofV (Any button has been pressed.
CN201 or CN920 in the power supply block. If not outputted, theThe voltage at PONCHK (e; pin) of the IF CON (IC404) on the
power supply block will be faulty.IF-83 board exceeds 0.5 V.
Also check the following, as the set does not work normally under
these conditions.3. At [POWER] button ON, LED lights in green but
returns to red (standby state) after several seconds
2. At [POWER] button ON, LED does not light in greenThe PONCHK (e; pin) of the IF CON (IC404) on the IF-83 board
even once, but kept in red (standby state)is abnormal (slow rising from 0.5 V to more than 1.5 V, or voltage
Check if the specified voltage is outputted from the EVER -11 Vnot rising to more than 1.5 V).
(3 pin), EVER +3.3 qa pin), and EVER +11 V (qd pin) ofV (The SYSTEM CONTROL (IC103) on the MB-100 board is faulty.
CN201 or CN920 in the power supply block. If not outputted, the
power supply block will be faulty.
Check the P-CONT (2 pin) of CN401 on the IF-83 board if it
becomes OH�. If not OH�, a soldering failure of that line, a short
with other line, missing capacitor or resistor, faulty AVD (IC503),
loose connection between power supply block and IF-83 board,
loose connection of connectors, faulty power supply block, or faulty
IF-83 board is doubtful.
Also check the following, as the set does not work normally under
these conditions.
3. At [POWER] button ON, LED lights in green but
returns to red (standby state) after several seconds
(e.g. it returns to standby state after OSONY DVD�
was displayed)
There is no regularity between faulty parts and timing when the
set returns to the standby state).
Check if the specified voltage is outputted from the power supply
block. If not outputted, the power supply block will be faulty.
Check the XFRRST (9 pin) of CN101 on the MB-100 board if it
is fixed to OL�, or the XIBUSY (0 pin), XIFCS (qa pin), SI0 (qs
pin), SO0 (qd pin) and SC0 (qf pin) of CN101 if they are fixed to
OL� or OH�.
If fixed to OL� or OH�, a soldering failure of that line, a short with
other line, missing capacitor or resistor, or faulty AVD (IC503) is
doubtful.
6-19 E6-19 |
ACEC
SONY
