CHANGE DETAILS:
1. Main board change to VM4.0. PCBA PN changed from 01-37502-00 to 01-37502-01. Below are
the changes on this board.
a. Add D229 and D232 diode 1N5404
b. Add C282 2200uF/25V electrolytic capacitor
c. Add P217B socket
d. Add P216B socket
2. Tone board. PCBA PN changed from 01-37503-00 to 01-37503-01. Below is the change on this
board.
a. R329 changed from 47ohms resistor to 5mm jumper wire.
3. Standby board change to VM3.0. PCBA part number changed from 01-37504-10 to 01-37504-11
for AH version and 01-37504-20 to 01-37504-21 for C version. Below are the changes on this board.
a. D408 changed from 1N4148 to 1N4007
b. R401 changed from 68K resistor to TVS P6KE-200A
c. IC402 regulator changed from LM7805 to LM7806
d. TR402 transformer change to PN: 22-01615-00
e. D410 diode 1N4148 added
f. R406 10-ohm resistor added
g. R407 3.6K resistor added
h. R408 10K resistor added
i. R405 22K resistor added
j. IC403 TL431 added
k. C411 10uF/50V electrolytic capacitor added
l. D409 1N4148 diode removed
m. D403 4.7
V zener diode removed
n. D402 1N5822 diode removed
o. C403 10nF capacitor removed
p. C406 220uF/16V electrolytic capacitor removed
4. Display board change to VM4.0. PCBA PN changed from 01-37505-00 to 01-37505-01. Below are
the changes on this board.
a. IC502 changed from CAT1021LI-42 to STC12C5A16S2-35C-LQFP44
b. IC501 changed from SP232EEP to SP3232EEN
c. IC505 footprint changed from DIP16 to SO16
d. R521 changed from 270-ohm to 330-ohm
e. R506 changed from 1K to 10K
f. R508 changed from 10K to 1K
g. R548 changed from 1K to 4.7K
h. R551 changed from 5mm jumper wire to 10K resistor
i. D501 changed from 1N4007 to 10mm jumper wire
j. D551 changed from 1N5819 to 10mm jumper wire
k. R510-R511 changed from 1K to 10K
l. C514 100nF capacitor removed
m. R501, R503, R504 and R528 10K resistor removed
n. D550 1N5819 diode removed
o. IC503 AT89S52-24PU and IC socket removed
p. C508 100uF/16V electrolytic capacitor removed
q. C521 and C522 100uF/16V electrolytic capacitor added
r. J502 in circuit program socket added
5. Main transformer changed from (PN: JA18-37571-01) to (PN: JA18-37571-11).
6. Change rear panel to show <0.5W star logo.
VERSION
AH Version PN: 67-124002-1B
C Version PN: 67-124001-1C
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